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1 typical operating circuits 19-5788; rev 3; 5/12 typical operating circuits continued at end of data sheet. general description the MAX14824 is an io-link m master interface that inte - grates an io-link physical layer transceiver with an auxiliary digital input and two linear regulators. high port count io-link master applications are supported through in-band spi addressing, and the 12mhz spi interface minimizes host controller access times. in-band address - ing and selectable spi addresses enable cascading up to 16 devices. the device supports all the io-link data rates and fea - tures slew-rate-controlled drivers to reduce emi. the driver is guaranteed to drive up to 300ma (min) load currents. internal wake-up circuitry automatically deter - mines the correct wake-up polarity, allowing for the use of simple uarts for wake-up pulse generation. the MAX14824 is available in a 4mm x 4mm, 24-pin tqfn package with exposed pad, and operates over the extended -40 n c to +105 n c temperature range. applications io-link master controllers plc fieldbus gateways high port count io-link masters 24v digital inputs and outputs features s io-link v.1.0 and v.1.1 physical layer compliant s supports com1, com2, and com3 data rates s push-pull, high-side, or low-side outputs s 300ma c/q output drive s 1f c/q load drive capability s generates 500ma wake-up pulse s automatic wake-up pulse polarity s auxiliary digital input s 5v and 3.3v linear regulators s spi interface for configuration and monitoring s spi-based chip addressing s emi emission control through slew-controlled driver s reverse-polarity protection on di s short-circuit protection on c/q s high temperature warning and thermal shutdown s extensive fault monitoring and reporting s -40 n c to +105 n c operating temperature range s 4mm x 4mm tqfn package io-link is a registered trademark of profibus user organization (pno). ordering information appears at end of data sheet. for related parts and recommended products to use with this part, refer to: www.maxim-ic.com/MAX14824.related MAX14824 1f 1f 0.1f 270pf 270pf ldoin c/q c/q spi di gnd a3 a2 a1 a0 gnd 24v v 5 v cc v cc ldo33 v l txq io-link controller wuen gpo rx rx txc tx txen rts MAX14824 io-link master transceiver evaluation kit available for pricing, delivery, and ordering information, please contact maxim direct at 1-888-629-4642, or visit maxims website at www.maxim-ic.com.
2 MAX14824 io-link master transceiver functional diagram MAX14824 uv monitor uv v cc v 5 ldo33 ldoin status and configuration 3.3v ldo filter driver wu polarity generator short-circuit protection reverse polarity protection 5v ldo v l sdi cs rx li c/q di gnd c/q load di load sdo sclk irq a3:a0 wuen txq txc txen
3 MAX14824 io-link master transceiver (all voltages referenced to gnd, unless otherwise specified.) v cc ........................................................................ -0.3v to +40v ldoin .................................................................... -0.3v to +40v v 5 ....................... 0.3v to the lesser of (v ldoin + 0.3v) and +6v ldo33 .................... -0.3v to the lesser of (v 5 + 0.3v) and +6v v l ............................................................................. -0.3v to +6v di ............................................................................ -40v to +40v c/q ........................................................... -0.3v to (v cc + 0.3v) logic inputs txc, txq, txen, a2, cs , sdi, sclk, wuen .. -0.3v to (v l + 0.3v) a3, a1, a0 ........................................................... -0.3v to +6v logic outputs rx, li, sdo, irq ..................................... -0.3v to (v l + 0.3v) uv ........................................................................ -0.3v to +6v continuous current into any logic pin .......................... q 50ma continuous power dissipation tqfn (derate 27.8mw/ n c above +70 n c) .................. 2222mw operating temperature range ........................ -40 n c to +105 n c maximum junction temperature ..................................... +150 n c storage temperature range ............................ -65 n c to +150 n c lead temperature (soldering, 10s) ................................ +300 n c soldering temperature (reflow) ...................................... +260 n c tqfn junction-to-ambient thermal resistance ( b ja ) .......... 36 n c/w junction-to-case thermal resistance ( b jc ) ................. 3 n c/w absolute maximum ratings note 1: package thermal resistances were obtained using the method described in jedec specification jesd51-7, using a four- layer board. for detailed information on package thermal considerations, refer to www.maxim-ic.com/thermal-tutorial . stresses beyond those listed under absolute maximum ratings may cause permanent damage to the device. these are stress ratings only, and functional opera - tion of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. exposure to absolute maximum rating conditions for extended periods may affect device reliability. package thermal characteristics (note 1) dc electrical characteristics (v cc = 18v to 36v, v l = 2.3v to 5.5v, v gnd = 0v; all logic inputs at v l or gnd; t a = -40 n c to +105 n c, unless otherwise noted. typical values are at v cc = 24v, v l = 3.3v, and t a = +25 n c, unless otherwise noted.) (note 2) parameter symbol conditions min typ max units v cc supply voltage v cc for driver operation 9 36 v v cc supply current i cc v cc = 24v, c/q as input, no load on v 5 or ldo33, ldoin not connected to v cc , v ldoin = 24v 1.3 2.5 ma v cc undervoltage lockout threshold v ccuvlo v cc falling 6 7.5 9 v v cc undervoltage lockout threshold hysteresis v ccuvlo_hyst 200 mv v 5 supply current i 5_in ldoin shorted to v 5 , external 5v applied to v 5 , no switching, ldo33 disabled 3 ma v 5 undervoltage lockout threshold v 5uvlo v 5 falling 2.4 v v l logic-level supply voltage v l 2.3 5.5 v v l logic-level supply current i l all logic inputs at v l or gnd 5 f a v l undervoltage threshold v luvlo v l falling 0.65 0.95 1.3 v 5v ldo (v 5 ) ldoin input voltage range v ldoin 7 36 v
4 MAX14824 io-link master transceiver dc electrical characteristics ( continued ) (v cc = 18v to 36v, v l = 2.3v to 5.5v, v gnd = 0v; all logic inputs at v l or gnd; t a = -40 n c to +105 n c, unless otherwise noted. typical values are at v cc = 24v, v l = 3.3v, and t a = +25 n c, unless otherwise noted.) (note 2) parameter symbol conditions min typ max units ldoin supply current i ldoin v ldoin = 24v, c/q as input, no load on v 5 or ldo33 3.0 5 ma v 5 output voltage range v 5 no load on v 5 , 7v p v ldoin p 36v 4.75 5.00 5.25 v v 5 load regulation 1ma < i load < 10ma, v ldoin = 7v, 0.1 f f bypass capacitor on v 5 0.08 % 3.3v ldo (ldo33) ldo33 output voltage v ldo33 no load on ldo33 3.1 3.5 v ldo33 undervoltage lockout threshold v ldo33uvlo v ldo33 falling 2.4 v ldo33 load regulation 1ma < i load < 10ma, v ldoin = 7v 0.25 % 24v interface c/q output resistance high r oh_c/q c/q high-side enabled, i c/q = -200ma, 9v p v cc p 36v (note 5) 1.8 2.9 i c/q output resistance low r ol_c/q c/q low-side enabled, i c/q = +200ma, 9v p v cc p 36v (note 5) 2.0 3.6 i c/q source current limit i oh_c/q c/q high-side enabled, v c/q < (v cc - 3v), 9v p v cc p 36v +500 +670 ma c/q sink current limit i ol_c/q c/q low-side enabled, v c/q > 3v, 9v p v cc p 36v -660 -500 ma c/q input threshold high v ih_c/q c/q driver disabled 10.5 13.0 v c/q input threshold low v il_c/q c/q driver disabled 8.0 11.5 v c/q input hysteresis v hys_c/q c/q driver disabled 1.0 v di input threshold high v ih_di 6.8 8 v di input threshold low v il_di 5.2 6.4 v di input hysteresis v hys_di 1 v c/q weak pulldown current i pdc/q c/q driver disabled, v c/q = v cc 100 400 f a di weak pulldown current i pddi di load disabled, v di = v cc 50 300 f a c/q input capacitance c c/q c/q driver disabled 40 pf di input capacitance c di 20 pf c/q, di input load c/q load current i llm_c/q c/q load enabled (c/qload = 1) 0 p v c/q p 5v 0 8.1 ma 9v p v c/q 5 6.8 8.1 di load current i llm_di di load enabled (diload = 1) 0 p v di p 5v 0 4.3 ma 9v p v di 2 3.5 4.3
5 MAX14824 io-link master transceiver dc electrical characteristics ( continued ) (v cc = 18v to 36v, v l = 2.3v to 5.5v, v gnd = 0v; all logic inputs at v l or gnd; t a = -40c to +105c, unless otherwise noted. typical values are at v cc = 24v, v l = 3.3v, and t a = +25 n c, unless otherwise noted.) (note 2) ac electrical characteristics (v cc = 18v to 36v, v l = 2.3v to 5.5v, v gnd = 0v; all logic inputs at v l or gnd; t a = -40 c to +105 c, unless otherwise noted. typical values are at v cc = 24v, v l = 3.3v, and t a = +25 o c, unless otherwise noted.) (note 2) parameter symbol conditions min typ max units logic inputs (txc, txq, txen, cs , wuen, sdi, sclk, a3, a2, a1, a0) logic input-voltage low v il 0.3 x v l v logic input-voltage high v ih 0.7 x v l v logic input leakage current i leak logic input = gnd or v l -1 +1 f a logic input capacitance c in 5 pf a1 pulldown resistance r a1pd 325 800 k i logic outputs (rx, li, uv, sdo, irq ) logic output-voltage low v ol i out = -5ma 0.4 v logic output-voltage high v ohrx , v ohwu , v ohli , v ohsdo , v ohirq , i out = 5ma (note 3) v l - 0.6 v sdo leakage current i lk_sdo sdo disabled, sdo = gnd or v l -1 +1 f a thermal shutdown thermal warning threshold die temperature rising, otemp bit is set +115 n c thermal warning threshold hysteresis die temperature falling, otemp bit is cleared 20 n c thermal shutdown threshold die temperature rising +150 n c thermal shutdown hysteresis 20 n c parameter symbol conditions min typ max units c/q, di interfaces data rate dr hislew = 1 4.8 230.4 kbps hislew = 0 4.8 38.4 driver (c/q) driver low-to-high propagation delay t pdlh push-pull or high-side (pnp) configuration, figure 1 hislew = 1 0.5 2 f s hislew = 0 1.6 5 driver high-to-low propagation delay t pdhl push-pull or low-side (npn) configuration, figure 1 hislew = 1 0.5 2 f s hislew = 0 1.6 5
6 MAX14824 io-link master transceiver ac electrical characteristics ( continued ) (v cc = 18v to 36v, v l = 2.3v to 5.5v, v gnd = 0v; all logic inputs at v l or gnd; t a = -40 o c to +105 o c, unless otherwise noted. typical values are at v cc = 24v, v l = 3.3v, and t a = +25 o c, unless otherwise noted.) (note 2) parameter symbol conditions min typ max units driver skew t skew |t pdlh - t pdhl | 0.1 2 f s driver rise time t rise push-pull or high-side (pnp) configuration, figure 1 hislew = 1 0.4 0.85 f s hislew = 0 1.5 4 driver fall time t fall push-pull or low-side (npn) configuration, figure 1 hislew = 1 0.4 0.85 f s hislew = 0 1.4 4 driver enable time high t enh push-pull or high-side (pnp) configuration, figure 3 hislew = 1 0.3 1.5 f s hislew = 0 0.8 7 driver enable time low t enl push-pull or low-side (npn) configuration, figure 2 hislew = 1 0.3 1.5 f s hislew = 0 0.9 7 driver disable time high t dish push-pull or high-side (pnp) configuration, figure 2 (note 4) hislew = 1 1.6 3 f s hislew = 0 1.6 3 driver disable time low t disl push-pull or low-side (npn) configuration, figure 3 (note 4) hislew = 1 0.1 3 f s hislew = 0 0.1 3 receiver (c/q, di) (figure 4) receiver low-to-high propagation delay t prlh rxfilter = 0 0.4 2 f s rxfilter = 1 0.2 2 receiver high-to-low propagation delay t prhl rxfilter = 0 0.5 2 rxfilter = 1 0.3 2 wake-up generation (figure 5) wake-up enable setup time t wuen,s 30 ns wake-up enable hold time t wuen,h 30 ns wake-up pulse rise propagation delay t 1 1.5 5 f s wake-up pulse fall propagation delay t 2 1.5 3 f s spi timing ( cs , sclk, sdi, sdo) (figure 6) sclk clock period t ch+cl 83.3 ns sclk pulse-width high t ch 41.65 ns sclk pulse-width low t cl 41.65 ns cs fall to sclk rise time t css 20 ns sclk rise to cs rise hold time t csh 20 ns sdi hold time t dh 10 ns
7 MAX14824 io-link master transceiver ac electrical characteristics ( continued ) (v cc = 18v to 36v, v l = 2.3v to 5.5v, v gnd = 0v; all logic inputs at v l or gnd; t a = -40 o c to +105 o c, unless otherwise noted. typical values are at v cc = 24v, v l = 3.3v, and t a = +25 o c, unless otherwise noted.) (note 2) note 2: all devices are 100% production tested at t a = +25 n c. limits over the operating temperature range are guaranteed by design. note 3: uv is an open-drain output. connect uv to a voltage less than 5.5v through an external pullup resistor. note 4: disable time measurements are load-dependent. note 5: guaranteed by design. limits are not production tested. parameter symbol conditions min typ max units sdi setup time t ds 10 ns output data propagation delay t do 32 ns sdo rise and fall times t ft 20 ns minimum cs pulse t csw 76.8 ns
8 MAX14824 io-link master transceiver figure 1. driver polarity and timing figure 2. driver enable low and disable high timing txen txc and txq c/q t pdhl t fall t rise t pdlh 90% v l v l v cc 0v 0v 0v 50% 50% 10% MAX14824 txc txq 3.3nf 5k txen gnd c/q v l txc txq c/q v cc txen c/q t enl t dish v l v cc 0v 0v 10% 10% 3.3nf 5k txen gnd MAX14824
9 MAX14824 io-link master transceiver figure 3. driver enable high and disable low timing figure 4. receiver polarity and timing txen c/q t enh t disl v l v cc 0v 0v 90% 90% c/q 3.3nf 5k txen gnd txc txq MAX14824 c/q or di rx or li t prlh t prhl v cc v l 0v 0v 50% 50% rx or li 15pf gnd txen MAX14824 c/q or di
10 MAX14824 io-link master transceiver figure 5. wake-up generation figure 6. spi timing diagram wuen c/q t wuen, s t 1 t 2 80s wake-up pulse x t wuen, h txc and txq t csh t cl t css t ch t csh cs sclk sdi sdo t ds t dh t do
11 typical operating characteristics (v cc = 24v, ldoin = v cc , v l = ldo33, c/q is in push-pull configuration, t a = +25 n c, unless otherwise noted.) c/q driver output switching (hislew = 0) MAX14824 toc05 2s/div v c/q 5v/div v txc 2v/div 0v 0v ch1 ch2 1.593s ch1 ch2 1.408s ch2 rise 1.618s ch2 fall 1.520s txen = v l txc = txq c/q driver output switching (hislew = 1) MAX14824 toc06 2s/div v c/q 5v/div v txc 2v/div 0v 0v ch1 ch2 425.9ns ch1 ch2 381.9ns ch2 rise 365.6ns ch2 fall 370.4ns txen = v l txc = txq c/q driver propagation delay vs. temperature (hislew = 1) MAX14824 toc04 temperature (c) t pdhl (s) 60 75 45 30 15 0 -15 -30 0.20 0.25 0.30 0.35 0.40 0.45 0.50 0.15 -45 90 txen = v l txc = txq c/q driver propagation delay vs. temperature (hislew = 0) MAX14824 toc03 temperature (c) t pdhl (s) 75 60 30 45 -15 0 15 -30 1.32 1.34 1.36 1.38 1.40 1.42 1.44 1.46 1.48 1.50 1.30 -45 90 txen = v l txc = txq c/q driver output low vs. load current MAX14824 toc02 load current (ma) v ol_c/q (v) 700 600 500 400 300 200 100 1 2 3 4 5 6 7 0 0 800 t a = +25c t a = +85c t a = +105c t a = -40c txen = v l tcx = txq = v l c/q driver output high vs. load current MAX14824 toc01 load current (ma) v oh_c/q (v) 700 600 500 400 300 200 100 18 19 20 21 22 23 24 17 0 800 t a = +25c t a = +85c t a = +105c t a = -40c txen = v l tcx = txq = gnd MAX14824 io-link master transceiver
12 typical operating characteristics (continued) (v cc = 24v, ldoin = v cc , v l = ldo33, c/q is in push-pull configuration, t a = +25 n c, unless otherwise noted.) wake-up generation MAX14824 toc11 20s/div v c/q 10v/div v txc 2v/div 0v 0v 0v v wuen 2v/div c/q short-circuit protection MAX14824 toc10 40s/div i sink 500ma/div v c/q 10v/div 0v 0ma 0v v irq 2v/div txc = txq = v l , t short = 300s c/q short-circuit protection MAX14824 toc09 40s/div i source 500ma/div txc = txq = gnd, t short = 200s v c/q 10v/div 0v 0ma 0v v irq 2v/div c/q receiver propagation delay vs. temperature (rxfilter = 1) MAX14824 toc08 temperature (c) t prhl (ns) 75 60 30 45 -15 0 15 -30 50 100 150 200 250 300 350 400 450 500 0 -45 90 di to li c/q to rx receiver propagation delay vs. temperature (rxfilter = 0) MAX14824 toc07 temperature (c) t prhl (ns) 75 60 30 45 -15 0 15 -30 50 100 150 200 250 300 350 400 450 500 0 -45 90 di to li c/q to rx MAX14824 io-link master transceiver
13 typical operating characteristics (continued) (v cc = 24v, ldoin = v cc , v l = ldo33, c/q is in push-pull configuration, t a = +25 n c, unless otherwise noted.) ldoin supply current vs. ldoin voltage MAX14824 toc15 v ldoin (v) i ldoin (ma) 30 33 27 24 21 18 15 12 0.5 1.0 1.5 2.0 2.5 3.0 3.5 0 93 6 t a = +85c t a = +25c t a = -40c v cc = 36v c/q driver is enabled txc = txq = v l v cc supply current vs. c/q data rate MAX14824 toc16 c/q data rate (kbps) i cc (ma) 100 10 2 4 6 8 10 12 14 16 18 20 0 1 1000 v ldoin = v 5 = 5v, txen = v l , hislew = 1, no load on c/q, continuous 1010 pattern transmission v cc = 36v v cc = 30v v cc = 24v v cc supply current vs. v cc voltage MAX14824 toc14 v cc voltage (v) i cc (ma) 33 30 24 27 15 18 21 12 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0 0 93 6 t a = +85c t a = +25c t a = -40c v ldoin = 7v c/q driver is enabled txc = txq = v l ldo33 load regulation MAX14824 toc13 load current (ma) % voltage change 45 40 30 35 10 15 20 25 5 -0.9 -0.8 -0.7 -0.6 -0.5 -0.4 -0.3 -0.2 -0.1 0 -1.0 05 0 t a = +25c t a = +85c t a = -40c v 5 load regulation MAX14824 toc12 load current (ma) % voltage change 40 30 20 10 -0.4 -0.3 -0.2 -0.1 0 0.1 -0.5 05 0 t a = +25c t a = +85c t a = -40c MAX14824 io-link master transceiver
14 MAX14824 io-link master transceiver pin configuration pin description pin name function 1 ldoin 5v linear-regulator input. bypass ldoin to gnd with a 0.1 f f ceramic capacitor. 2 v 5 5v power-supply input and 5v linear-regulator output. bypass v 5 to gnd with a 0.1 f f ceramic capacitor. see the 5v and 3.3v linear regulators section for more information. 3 ldo33 3.3v linear-regulator output. bypass ldo33 to gnd with a 1 f f ceramic capacitor. 4 irq active-low interrupt request output. irq is a push-pull output referenced to v l . 5 sclk spi clock input 6 cs spi chip-select input 7 sdo spi serial-data output port 8 sdi spi serial-data input port 9 v l logic-level supply input. v l defines the logic levels on all the logic inputs and outputs. bypass v l to gnd with a 0.1 f f ceramic capacitor. 10 a3 chip-select address input 3. do not leave a3 unconnected. 11 txq transmit level input. txq is anded with txc. drive txq high if not in use. 12 txc transmit communication input. txc is anded with txq. drive txc high if not in use. 13 txen transmitter enable. driving txen high enables the c/q transmitter. while the c/q transmitter is enabled, the c/q current sink is turned off. 23 24 22 21 8 7 9 v 5 irq sclk cs 10 ldoin li wuen rx uv txen 12 a1 45 6 17 18 16 14 13 v cc a0 a3 v l sdi sdo *ep *connect exposed pad to gnd. ldo33 a2 3 15 c/q 20 11 txq gnd 19 12 txc di tqfn (4mm 4mm) top view + MAX14824
15 MAX14824 io-link master transceiver pin description (continued) detailed description the MAX14824 is an io-link m master transceiver that integrates an io-link physical interface with an additional 24v digital input and two ldos. a 12mhz spi k interface allows fast programming and monitoring. the device supports com1, com2, and com3 io-link data rates and has the option of limiting emitted emi by selecting a lower slew rate at lower data rates. the auto - matic wake-up circuitry determines the correct wake-up pulse polarity, allowing the use of simple uarts for wake-up pulse generation. the c/q and di inputs have selectable current sinks that can be enabled for use in actuators. the device is configured and monitored through an spi interface. extensive alarms are available through spi. 24v interface the device features an io-link transceiver interface capable of operating with voltages up to 36v. this includes the c/q input/output and the logic-level digital input (di). di is reverse-polarity protected. short-circuit protection is provided on the c/q driver. configurable c/q driver the devices c/q driver has a selectable push-pull, high- side (pnp), or low-side (npn) switching driver. set the c/q_n/p and c/q_pp bits in the cqconfig reg - ister to select the driver mode for the c/q driver. when configured as a push-pull output, c/q switches between v cc and ground. set the c/q_pp bit to 1 to select push- pull operation. set the c/q_pp bit to 0 to configure the c/q output for open-drain operation. the c/q_n/p bit selects npn or pnp operation when c/q is configured as an open-drain output. c/q driver and receiver the c/q driver can be enabled through hardware (txen) or software (c/qden). drive txen high to enable the c/q driver and drive txen low to disable the driver. the c/q driver can be enabled through the c/qden bit in the c/qconfig register. the c/q driver on the device is specified for 300ma to drive large capacitive loads over 1 f f and dynamic impedances like incandescent lamps. io-link is a registered trademark of procibus user organization (pno). spi is a trademark of motorola inc. pin name function 14 rx receiver output. rx is the inverse logic level of c/q. rx is always high when the rxdis bit in the cqconfig register is set to 1. 15 wuen wake-up enable input. drive wuen high to enable automatic wake-up pulse generation. 16 a2 chip-select address input 2. do not leave a2 unconnected. 17 li logic output of 24v di logic input. li is the inverse logic of di. li is referenced to v l . 18 uv open-drain undervoltage indicator output. uv is active high. 19 di 24v logic-level digital input 20 gnd ground 21 c/q sio/io-link data input/output. drive txen high to enable the c/q driver. the logic on the c/q output is the inverse logic level of the signals on the txc and txq inputs. drive txen low to disable the c/q driver. rx is the logic inverse of c/q. 22 a1 chip-select address input 1. do not leave a1 unconnected. 23 v cc power-supply input. bypass v cc to gnd with a 1 f f ceramic capacitor. 24 a0 chip-select address input 0. do not leave a0 unconnected. ep exposed pad. connect ep to gnd.
16 MAX14824 io-link master transceiver the hislew bit increases the slew rate of the c/q driver output. set hislew to 1 for data rates of 230kbps or higher. set hislew to 0 to reduce the c/q driver slew rate and reduce emi emission and reflections. the c/q receiver is always on. disable the rx output through the rxdis bit in the cqconfig register. set the rxdis bit to 1 to set the rx output high. set the rxdis bit to 0 for normal receive operation. the c/q receiver has an analog lowpass filter to reduce high-frequency noise present on the line. set the rxfilter bit in the cqconfig register to 0 to set the filter corner frequency to 500khz (typ). set the rxfilter bit to 1 to set the corner frequency of the filter to 1mhz (typ). noise filters are present on both the c/q and di receivers and are controlled simultaneously by the rxfilter bit. c/q fault detection the device registers a c/qfault condition under either of two conditions: 1) when it detects a short circuit for longer than 160s (typ). a short condition exists when the c/q drivers load current exceeds the 670ma (typ) current limit. 2) when it detects a voltage level error at the c/q out - put. a voltage level error occurs when the c/q driver is configured for open-drain operation (npn or pnp), the driver is turned off, and the c/q voltage is not pulled to exceed the c/q receivers threshold levels (< 8v or > 13v) by the external supply. when a c/qfault error occurs, the c/qfault and c/qfaultint bits are set, irq asserts, and the driver is turned off 240s (typ) after the start of the fault condition. when a short-circuit event occurs on c/q, the driver enters autoretry mode. in autoretry mode the device peri - odically checks if the short is still present and attempts to correct the driver output. autoretry attempts last for 350s (typ) and occur every 26ms (typ). di auxillary digital input di is a digital input that is type 1 and type 3 compliant when the internal 3.5ma di current load is enabled. if the io-link master system does not require auxilliary digital inputs, di can be connected to c/q as shown in the typical operating circuits . this reduces the power dissi - pation when c/q is operated as a digital input, by enabling the di current load instead of the c/q current load. di is tolerant to reverse polarity voltages down to -40v when not connected to c/q. 5v and 3.3v internal regulators the device includes two internal current-limited regulators to generate 5v (v 5 ) and 3.3v (ldo33). v 5 is specified at 10ma. ldo33 is specified at 10ma. the input of v 5 , ldoin, can be connected to v cc or to another voltage in the 7v to 36v range. v 5 consitutes the supply for the logic block in the device. the device can be powered by an external 5v power supply. disable the 5v ldo by connecting ldoin to v 5 . apply an external voltage from 4.75v to 5.25v to v 5 when the ldo is disabled. use the ldo33dis bit in the mode register to enable/ disable ldo33. see the mode register [r1, r0] = [1,1] section for more information. v 5 and ldo33 are not pro - tected against short circuits. power-up the c/q driver output and the uv output are high imped - ance when v cc , v 5 , v l , and/or ldo33 voltages are below their respective undervoltage thresholds during power-up. uv goes low and the c/q driver is enabled when all these voltages exceed their respective under - voltage lockout thresholds. the c/q driver is automatically disabled if v cc , v 5 , or v l falls below its threshold. undervoltage detection the device monitors v cc , v 5 , v l , and, optionally, ldo33 for undervoltage conditions. uv is high impedance when any monitored voltage falls below its uvlo threshold. v cc , v 5 , and v l undervoltage detection cannot be dis - abled. when v cc falls below the v ccuvlo threshold, the uv24 and uv24int bits are set, uv asserts high, and irq asserts low. the spi register contents are unchanged while v 5 is present, regardless of the state of v cc or ldo33. the spi interface is not accessible and irq is not available when uv is asserted due to a v 5 or v l undervoltage event. when the internal 3.3v ldo regulator voltage (v ldo33 ) falls below the ldo33 undervoltage lockout threshold, the uv33int bit in the status register is set and irq asserts. uv asserts if the uv33en bit in the mode register is set to 1. the uv output deasserts once the undervoltage condi - tion is removed; however, the associated interrupts bits in the status register and the irq output are not cleared until the status register has been read.
17 MAX14824 io-link master transceiver wake-up generation the MAX14824 features automatic wake-up polarity gen - eration functionality that can be initiated through hard - ware or software. the following conditions must be met prior to automatic wake-up polarity generation to ensure proper functionality: ? wuen is low ? txen is low and c/qden = 0 ? q = 0 ? txc and txq are both high drive wuen high to enable the automatic wake-up polarity generation circuitry in the device. when wuen is high, apply an external pulse to txc or txq from high-to-low for 80 f s (typ) to generate a valid wake-up pulse. the applied pulse is independent of the logic state that the io-link sensor was forcing on the c/q level ( figure 5 ). drive wuen low after the wake-up has been generated. the c/q driver is automatically enabled while txc/txq is low and c/q is pulled either from high-to-low or from low-to-high, depending on the previous state. the c/q driver is automatically disabled when the txc/txq inputs are pulled high again. wake-up polarity generation can also be enabled through software by setting the wuenbit bit in the mode register to 1. see the mode register [r1, r0] = [1,1] section for more information. thermal protection and considerations the internal ldos and c/q driver can generate more power than the package for the device can safely dis - sipate. ensure that the driver ldo loading is less than the package can dissipate. total power dissipation for the device is calculated using the following equation: p total = p c/q + p 5 + p ldo33 + p q + p clcq + p cldi where p c/q is the power generated in the c/q driver, p 5 and p ldo33 are the power generated by the ldos, p q is the quiescent power generated by the device, and p clcq and p cldi are the power generated in the c/q and di current sinks. ensure that the total power dissipation is less than the limits listed in the absolute maximum ratings section. use the following to calculate the power dissipation (in mw) due to the c/q driver: p c/q = [i c/q ] 2 x [r o ] calculate the power dissipation in the 5v ldo, v 5 , using the following equation: p 5 = (v ldoin - v 5 ) i 5 where i 5 includes the i ldo33 current sourced from ldo33. calculate the power dissipated in the 3.3v ldo, ldo33, using the following equation: p ldo33 = 1.7v i ldo33 calculate the quiescent power dissipation in the device using the following equation: p q = i cc v cc if the current sinks are enabled, calculate their associ - ated power dissipation as: p clcq = i llm_c/q v c/q p cldi = i llm_di v di overtemperature warning two bits in the status and mode registers are set when the temperature of the device exceeds +115 n c (typ). the otempint bit in the status register is set and irq asserts when the otemp bit in the mode register is set. read the status register to clear the otempint bit and irq . the otemp bit is cleared when the die temperature falls below +95 n c. the device continues to operate normally unless the die temperature reaches the +150 n c thermal shutdown threshold, when the device enters thermal shutdown. thermal shutdown when the die temperature rises above +150 n c (typ) ther - mal shutdown threshold, the c/q drivers and the c/q and di current loads are automatically turned off. the internal 3.3v and 5v ldos remain on during thermal shutdown, if enabled. if the internal or external v5 supply remains on during thermal shutdown (which is always true in case of the internal v5 regulator), the register contents are main - tained and spi communication available. when the die temperature falls below the thermal shut - down threshold plus hysteresis, the c/q driver and c/q and di current sinks turn on automatically.
18 MAX14824 io-link master transceiver register functionality the device has four 8-bit-wide registers for configuration and monitoring ( table 1 ). r1 and r0 are the register address. table 1. register summary r1/r0 = register address, x = unused bits. status register [r1, r0] = [0,0] register r1 r0 d7 d6 d5 d4 d3 d2 d1 d0 status 0 0 x x dilvl q lvl c/qfaultint uv33int uv24int otempint cqconfig 0 1 rxfilter hislew c/q_n/p c/q_pp c/qden q rxdis c/qload dioconfig 1 0 x x x x x x lidis diload mode 1 1 rst wuenbit x c/qfault uv24 otemp uv33en ldo33dis bit d7 d6 d5 d4 d3 d2 d1 d0 bit name x x dilvl q lvl c/qfaultint uv33int uv24int otempint read/write r r r r r r r r por state 0 0 u u 0 0 0 0 reset upon read yes yes no no yes yes yes yes x = unused bits. u = unknown. these bits are dependent on the di logic and c/q inputs. the status register reflects the logic levels of c/q and di and shows the source of interrupts that cause an irq hardware interrupt. the irq interrupt is asserted when an alarm condition (otemp, uv33en, uv24, c/qfault) is detected. all bits in the status register are read-only. the interrupt bits return to the default state after the status register is read. if a c/q f ault condition persists, the c/qfaultint bit is immediately set after the status register is read. bit name description d7:d6 x unused d5 dilvl di logic level. the dilvl bit mirrors the current logic level at the di input. it is the inverse of the li output and is always active regardless of the state of the lidis bit (table 2). dilvl does not affect irq . dilvl is not changed when the status register is read. d4 q lvl c/q logic level. the q lvl bit is the inverse of the logic level at c/q. q lvl is 1 when the c/q input level is low (< 8v) and is 0 when the c/q logic level is high (> 13v) (table 3). q lvl remains active when the c/q receiver is disabled (rxdis = 1). q lvl does not affect irq . q lvl is not changed when the status register is read. d3 c/qfaultint c/q fault interrupt. the c/qfaultint interrupt bit and c/qfault bit (in the mode register) are set when a short circuit or voltage fault occurs on the c/q driver output (see the c/q fault detection section for more information). irq asserts when c/qfault is 1. read the status register to clear the c/qfaultint bit and deassert irq .
19 MAX14824 io-link master transceiver table 2. dilvl and li output table 3. q lvl and rx output v di (v) dilvl bit li output < 5.2 0 high > 8 1 low v c/q (v) q lvl bit rx output < 8 1 high >13 0 low bit name description d2 uv33int internal 3.3v ldo (ldo33) undervoltage warning. both the uv33int interrupt bit and the uv33en bit (in the mode register) are set when v ldo33 falls below the 2.4v ldo33 undervoltage threshold. if uv33en is set in the mode register, irq asserts low when the uv33int bit is 1. read the status register to clear the uv33int bit and deassert irq . set the uv33en bit to 1 in the mode register to enable undervoltage monitoring for uv33int. when enabled, uv asserts high when the uv33int bit is 1. uv deasserts when v ldo33 rises above the ldo33 undervoltage threshold. d1 uv24int v cc undervoltage interrupt. the uv24int interrupt bit and the uv24 bit (in the mode register) are set when the v cc voltage falls below the 7.4v undervoltage threshold. irq asserts low when the uv24int bit is 1. read the status register to clear the uv24int bit and deassert irq . v cc undervoltage detection cannot be disabled. d0 otempint overtemperature warning. the otempint interrupt bit and the otemp bit (in the mode register) are set when a high-temperature condition is detected by the device. otemp is set when the temperature of the die exceeds +115 n c (typ). otempint is set and irq asserts when the otemp bit is 1. the otempint bit is cleared and irq deasserts when the status register is read. once cleared, otempint is not reset if the die temperature remains above the thermal warning threshold and does not fall below +95 c.
20 MAX14824 io-link master transceiver cqconfig register [r1, r0] = [0,1] bit d7 d6 d5 d4 d3 d2 d1 d0 bit name rxfilter hislew c/q_n/p c/q_pp c/qden q rxdis c/qload read/write r/w r/w r/w r/w r/w r/w r/w r/w por state 0 0 0 0 0 0 0 0 use the cqconfig register to control the c/q receiver and driver parameters. all bits in the cqconfig register are read-write and are set to 0 at power-up. bit name description d7 rxfilter c/q and di receiver filter control. the c/q and di receivers have analog lowpass filters to reduce high-frequency noise on the receiver inputs. set the rxfilter bit to 0 to set the filter corner frequency to 500khz. set the rxfilter bit to 1 to set the filter corner frequency to 1mhz (this setting is used for high- speed com3 operation). noise filters on c/q and di are controlled simultaneously by the rxfilter bit. d6 hislew slew-rate control. the hislew bit increases the slew rate for the c/q driver and is used for high-speed com3 (230kbps) data rates. set hislew to 0 for com1 and com2 operation. d5 c/q_n/p c/q driver npn/pnp mode. the c/q_n/p bit selects between low-side (npn) and high-side (pnp) modes when the c/q driver is configured as an open- drain output (c/q_pp = 0). set c/q_n/p to 1 to configure the driver for low- side (npn) operation. set c/q_n/p to 0 for high-side (pnp) operation. d4 c/q_pp c/q driver push-pull operation. set c/q_pp to 1 to enable push-pull opera - tion on the c/q driver. the c/q output is open drain when c/q_pp is 0. d3 c/qden c/q driver enable/disable. set the c/qden bit to 1 to enable the c/q driver. set c/qden to 0 for hardware (txen) control. see table 4. d2 q c/q driver output logic. the q bit can be used to program the c/q output driver through software. the c/q driver must be enabled and txc = txq must be high to control the c/q driver through the q bit (figure 8). c/q has the same logic polarity as the q bit. set the q bit to 0 to control the c/q driver with txc and txq. the c/q driver output state depends on the c/q_pp and c/q_n/p bits as shown in table 5. note that table 5 assumes that the c/q driver is enabled (txen = v l or c/qden = 1). d1 rxdis c/q receiver enable/disable. set the rxdis bit to 1 to disable the c/q receiver. the rx output is high when rxdis is 1. d0 c/qload c/q current sink enable. set the c/qload bit to 1 to enable the internal cur - rent sink at c/q. the c/q current sink is automatically disabled while the c/q driver is enabled (txen = high or c/qden = 1). this saves power.
21 MAX14824 io-link master transceiver table 5. c/q driver output state note: txc and txq = v l . x = dont care. table 4. c/qden and txen c/q driver control x = dont care. dioconfig register [r1, r0] = [1,0] figure 7. equivalent c/q logic txc and txq (see note) q c/q_pp c/q_n/p c/q configuration c/q state high 1 0 0 pnp, open drain on, c/q is high high 0 0 0 pnp, open drain off, c/q is high impedance high 1 0 1 npn, open drain off, c/q is high impedance high 0 0 1 npn, open drain on, c/q is low high 1 1 x push-pull high high 0 1 x push-pull low c/qden txen c/q driver 0 low disabled x high enabled 1 x enabled bit d7 d6 d5 d4 d3 d2 d1 d0 bit name x x x x x x lidis diload read/write r/w r/w r/w r/w r/w r/w r/w r/w por state 0 0 0 0 0 0 0 0 x = unused bits. use the dioconfig register to control the di and do interfaces. all bits in the dioconfig register are read-write and are set to 0 at power-up. bit name description d7:d2 x unused d1 lidis li output enable/disable. set the lidis bit to 1 to disable the li output. the li output is low when lidis is 1. d0 diload di current sink enable. set the diload bit to 1 to enable the internal current sink at the di input. txq c/q txc q
22 MAX14824 io-link master transceiver mode register [r1, r0] = [1,1] bit d7 d6 d5 d4 d3 d2 d1 d0 bit name rst wuenbit x c/qfault uv24 otemp uv33en ldo33dis read/write r/w r/w r/w r r r r/w r/w por state 0 0 0 0 0 0 0 0 x = unused bits. use the mode register to reset the device and manage the 3.3v ldo. the mode register has bits that represent the current status of fault conditions. when writing to the mode register, the contents of the fault indication bits (bits 2 to 4) do not change. bit name description d7 rst register reset. set rst to 1 to reset all registers to their default power-up state. then set rst to 0 for normal operation. the status register is cleared and irq deasserts (if asserted) when rst = 1. interrupts are not generated while rst = 1. d6 wuenbit auto wake-up polarity enable. drive the wuen input high or set the wuenbit bit to 1 to enable wake-up generation. when auto wake-up polarity is enabled, the device sam - ples the logic state of c/q and uses this as the basis for determining the subsequent wake-up pulse that is initiated through a high-to-low pulse on the txq and txc inputs. set the wuenbit to 1 before a negative-going, 80s (typ) wake-up pulse is transmitted to ensure that the device produces the correct polarity wake-up pulse on the c/q output. for example, if c/q is connected to a voltage high, then it pulls the line low for the wake- up pulse duration. if c/q is connected to a voltage low, then it pulls the line high for the wake-up pulse duration. clear wuenbit after the wake-up has been generated (table 6). d5 x unused d4 c/qfault c/q fault status. the c/qfault bit is set when a short circuit or voltage fault occurs at the c/q driver output (see the c/q fault detection section for more information). the c/qfault and c/qfaultint bits are both set when a fault occurs on c/q. c/qfault is cleared when the fault is removed. d3 uv24 v cc undervoltage condition. both the uv24 and the uv24int bits are set when v cc falls below v ccuvlo . uv24 is cleared when v cc rises above the v cc threshold. v 5 must be present for v cc undervoltage monitoring. d2 otemp temperature warning. the otemp bit is set when a high-temperature condition occurs on the device. both the otempint interrupt in the status register and the otemp bit are set when the junction temperature of the die rises to above +115 n c (typ). the otemp bit is cleared when the junction temperature falls below +95 n c (typ). d1 uv33en ldo33 uv enable. set the uv33en bit to 1 to assert the uv output when ldo33 volt - age falls below the 2.4v (typ) undervoltage lockout threshold. the uv33en bit does not affect the uv33int bit in the status register; irq asserts when v ldo33 falls below v ldo33uvlo regardless of the state of uv33en. d0 ldo33dis ldo33 enable/disable. set ldo33dis to 1 to disable the 3.3v linear regulator (ldo33).
23 MAX14824 io-link master transceiver figure 8. spi write cycle figure 9. spi read cycle spi interface the device communicates through an spi-compatible 4-wire serial interface. the interface has three inputs clock (sclk), chip select (cs), and data in (sdi)and one output, data out (sdo). the maximum spi clock rate for the device is 12mhz. the spi interface complies with clock polarity cpol = 0 and clock phase cpha = 0 (see figure 8 and figure 9 ). the spi interface is not available when v 5 or v l is not present. table 6. auto wake-up polarity generation wuenbit wuen mode 0 low normal operation 0 high wake-up generation mode 1 low wake-up generation mode 1 high wake-up generation mode r0 d7 d6 d5 d4 d3 d2 d1 d0 sclk a_ = device address r_ = register address d_ = data bit = clock edge when logic is latched sdi w0 a3 a2 a1 a0 r1 cs sclk r1 r0 a3 a2 a1 a0 cs d7 d6 d5 d4 d3 d2 d1 d0 a_ = device address r_ = register address d_ = data bit = clock edge when logic is latched = clock edge at which logic is written sdi 0 r sdo x x
24 MAX14824 io-link master transceiver address selection the device includes four chip-select address inputs, a0Ca3, allowing up to 16 devices on a single bus. drive the address inputs high or low to program the device address as shown in table 7 . do not leave any address input unconnected. applications information uart interfacing the logic level of the MAX14824 microcontrollers uart interface i/os (txc, txq, txen, and rx) is defined by v l . the device can be interfaced to microcontrollers whose on-board uart tx output cannot be programmed as a logic output (gpo). in this case, connect the tx output of the uart to the txc input for io-link communication and connect a separate gpo output on the microcon - troller to txq for standard io (sio) mode operation ( figure 10 ). as the txq and txc inputs are internally logically anded, the unused input (txc or txq) must be held high while the other is in operation. transient protection inductive load switching, surges, esd and short circuits create high transient voltages. c/q and di must be pro - tected against high overvoltage and undervoltage tran - sients. positive voltage transients on di must be limited to +55v relative to gnd and negative voltage transients must be limited to -55v (relative to gnd) on di. two schottky diodes having low forward voltage, like the dlfs240, must be connected to c/q to clamp under- and overvoltage transients. figure 11 shows suitable protection to meet iec 61000-4-2 esd testing. for reduction of bit errors induced by burst transients, enable the receiver filters and add capacitors to c/q and di. if surge tests need to be met, a tvs diode is recommended on v cc. figure 10. uart interface figure 11. MAX14824 operating circuit with tvs protection table 7. address input selection a3 a2 a1 a0 device address low low low low 0x00 low low low high 0x01 low low high low 0x02 low low high high 0x03 low high low low 0x04 low high low high 0x05 low high high low 0x06 low high high high 0x07 high low low low 0x08 high low low high 0x09 high low high low 0x0a high low high high 0x0b high high low low 0x0c high high low high 0x0d high high high low 0x0e high high high high 0x0f microcontroller txq gpo txc tx txen rts rx rx MAX14824 MAX14824 1nf 270pf v cc c/q dfls240 sdc36c 1f 270pf gnd di dfls240
25 MAX14824 io-link master transceiver external power the device is powered by v cc and the 5v regulator, v 5 . v l is a reference voltage input to set the logic levels of the microcontroller interface. the logic and spi interface are operational when v 5 and v l are present even if v cc is not present. connect ldoin to v 5 to power the v 5 input with an external supply ( figure 12 ). this configuration disables operation of the internal 5v regulator and reduces power consumption. figure 12. use an external supply to power the MAX14824 1 2 4 3 10k MAX14824 max17501 1f 1f v cc uv gpio2 ldoin c/q lx fb gnd spi in en di l+ l- gnd gnd v 5 v cc ldo33 v l txq microcontroller wuen gpio1 rx rx txc tx txen rts li gpio3 3.3v 1nf 270pf 270pf
26 MAX14824 io-link master transceiver typical operating circuits (continued) txen addr 1 txc MAX14824 rx port 1 miso mosi sclk cs1 cs2 rst controller MAX14824 port 3 MAX14824 port 1 MAX14824 rx port 2 txen addr 2 txc rx txen addr 3 txc rx txen addr 4 txc max14830 gpio1 gpio9 gpio13 io-link quad master applica tion gpio5 tx0 rts0 rx0 tx1 rts1 rx1 tx2 rts2 rx2 tx3 rts3 xout xin miso mosi sclk cs rst rx3 v ext
27 MAX14824 io-link master transceiver ordering information chip information process: bicmos package information for the latest package outline information and land patterns (footprints), go to www.maxim-ic.com/packages . note that a +, #, or - in the package code indicates rohs status only. package drawings may show a different suffix character, but the drawing pertains to the package regardless of rohs status. +denotes a lead(pb)-free/rohs-compliant package. *ep = exposed pad. part temp range pin-package MAX14824gtg+ -40 n c to +105 n c 24 tqfn-ep* package type package code outline no. land pattern no. 24 tqfn-ep t2444+4 21-0139 90-0022
maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a maxim product. no circuit patent licenses are implied. maxim reserves the right to change the circuitry and specifications without notice at any time. the parametric values (min and max limits) shown in the electrical characteristics table are guaranteed. other parametric values quoted in this data sheet are provided for guidance. maxim integrated products, 120 san gabriel drive, sunnyvale, ca 94086 408-737-7600 28 ? 2012 maxim integrated products maxim is a registered trademark of maxim integrated products, inc. revision history revision number revision date description pages changed 0 3/11 initial release 1 6/11 changed di threshold to accommodate all three types of industrial sensors, added 24v supply connection in figure 13 4, 19, 25 2 8/11 corrected io-link trademark. corrected block description in functional diagram . corrected c/q minimum and maximum ratings in the absolute maximum ratings section. corrected icc maximum value and shuffled row parameters in the electrical characteristics table. replaced figures 9 and 10. added maxim part number for dc-dc regulator. corrected transient protection section. 1, 2, 3, 23, 24 3 5/12 changed temperature rating; updated typical operating circuits , functional diagram , and figures 9, 11, and 12; updated tocs 1, 2, and 16; changed parameters in electrical characteristics ; updated detailed description and application information 1-7, 11, 13-17, 20, 23, 24, 24, 25, 27 MAX14824 io-link master transceiver

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