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revision 1.3, 21-aug-08 page 1 of 13 general description as2702 (sap4.1) is a new generation as-interface slave device, which supports as-interface bus systems with up to 62 slave modules. each slave module is equipped with an as2702 device, which interfaces the module to the unshielded 2-wire as- interface bus for serial bidirectional data communication and power extraction. data communication over the as-interface takes place in master slave fashion, which foresees that all slave devices as2702 connected to the bus are sequentially and cyclicly addressed by a single, central master unit. data on the as- interface bus are manchester encoded and can be found as sin2-pulses with a vpp of between 3v and 8v on top of the bus? dc voltage of nominally 30v. as2702 regulates the nominal dc bus voltage of 30v internally down to 5v to supply it?s internal circuitry including a 16 x 8 bits eeprom, as well as down to a nominal supply level 24v with a max. loading of 35ma for the actuators and sensors connected to it at the field side. each slave device as2702 may interface to up to 4 sensors or 3 actuators. an as-interface bus system based on as2702 may hence link as many as 248 sensors and 186 actuators to a single master unit. slave device as2702 (sap4.1) is system compatible with predecessor device as2701a (isa3+): slave modules equipped with as2702 (sap4.1) will run in existing as-interface bus systems based on as2701a (isa3+). the as-interface concept is well established as a standardized digital bus system for industrial automation. key features ? interface device to connect actuators and sensors to an as-interface bus ? flexible system solution offering 2 package options: soic 20 for full functionality; soic 16 for applications not requiring the parameter port ? dc power extraction from the as-interface bus ? serial bidir. data communication with the bus ? data communication watchdog ? 4-bit bidir. data port plus strobe to poll the sensors and control the actuators connected ? 4-bit parameter port plus strobe to provide settings to the sensors and actuators ? 24v power supply for the sensors and actuators ? periphery fault input to signal hardware failure of the sensors and actuators ? integrated 16 x 8 bit eeprom to store (5 + 1)-bit slave address and settings ? 2 led outputs to optically flag slave unit operation status ? operating temperature ta: - 25c ? + 85c ? operating supply voltage/bus dc voltage: typ. 30v ? operating current (osc. on, outputs idle): 6ma ? supply for sensors/actuators: typ. 24v, 35ma as2702 as-interface slave ic data sheet
as2702 ? as-interface slave ic revision 1.3, 21-aug-08 page 2 of 13 block diagram ltgp ltgn uout cdc u5r osc2 osc1 oscil- lator receive transmit jabber inhibit u5r u5r u5r u5r v ltgp -6v thermo- detector + - + - bandgap por trimming u5r 16 x 8 bit serial e 2 prom 11 imp_pos imp_neg reset threshold dstbn p0...p3 d0...d3 pstbn scl sda pfault led1 4 4 led2 logic block figure 1 block diagram pin assignment and description soic 20 soic 16 name type note description pin no. pin no. 1 - p1 i/o, digital, pull-up 1, 2 bidir. parameter port bit 1 2 - p0 i/o, digital, pull-up 1, 2 bidir. parameter port bit 0 3 1 d1 i/o, digital bidir. data port bit 1 4 2 d0 i/o, digital bidir. data port bit 0 5 3 dstbn i/o, digital, pull-up 1 data port strobe output; reset-input 6 4 led1 i/o, digital, pull-up 1 led output 1 (ic test input) 7 5 osc2 o, analog output to quartz crystal 8 6 osc1 i, analog input from quartz crystal 9 7 u5r o, power nom. 5v power supply output 10 8 ltgn i, power neg. supply pin, connected to neg. as-interface bus line, ground reference 11 9 ltgp i, power pos. supply pin, connected to pos. as-interface bus line 12 10 cdc i/o, analog pin fo r ext. buffer capacitor 13 11 uout o, power nom. 24v power supply output
as2702 ? as-interface slave ic revision 1.3, 21-aug-08 page 3 of 13 soic 20 soic 16 name type note description 14 12 pfault i, digital, pull-up 1 low-active input to flag failure of the sensors/actuators circuitry connected 15 13 led2 i/o, digital, pull-up 1 led output 2 (ic test input) 16 14 pstbn i/o, digital, pull-up 1 parameter port strobe output (ic test input) 17 15 d3 i/o, digital bidir. data port bit 3 18 16 d2 i/o, digital bidir. data port bit 2 19 - p3 i/o, digital, pull-up 1, 2 bidir. parameter port bit 3 20 - p2 i/o, digital, pull-up 1, 2 bidir. parameter port bit 2 notes: 1 the pull-up structure is a passive high-side current source with a nom. 10a current. 2 the passive pull-up current source as per note 1 on these parameter port pins is off, if the slave device is programmed with i/o-configuration code 7 and a master data call is present. functional, electrical and timing characteristics all voltages are referenced to ground pin ltgn. timing is valid for a quartz crystal frequency of 5.333mhz. absolute maximum ratings symbol parameter min max unit note vltgp voltage at the positive supply pin -0.3 40 v 1) vcdc voltage at pin for ext. buffer capacitor -0.3 vltgp + 0.3v v vu5r voltage at pins u5r, osc1, osc2 -0.3 7 v iin input current at any pin, e xcept for ltgp, cdc -50 50 ma 2) esd1 electrostatic discharge voltage 1500 v 3) esd2 electrostatic discharge voltage 300 v 4) tstg storage temperature -55 125 v tbody soldering conditions 260 c 5) ptot max. power dissipation 1 w 6) rthja thermal resistance soic 16 61.2 74.8 k/w 7) rthja thermal resistance soic 20 58.5 71.5 k/w 7) notes: 1) 50v during t > 50s; repetition rate < 0.5hz 2) latch-up immunity test. please observe max. power dissipation allowed 3) human body model: r = 1.5kohm; c = 100pf 4) machine model; applies only for ltgp 5) the reflow peak soldering temperature (body temperature) is specified according ipc/jedec j-std-020c. 6) free convection, see figure 2 7) no forced cooling. pcb-surface: 21 cm 2 ; still air volume around the device. 10 cm 3
as2702 ? as-interface slave ic revision 1.3, 21-aug-08 page 4 of 13 1 0.5 50 100 t/ c pv/ w 1 0.5 50 100 t/ c pv/ w soic20 soic16 figure 2 max. acceptable power dissipation relative to ambient temperature recommended operating conditions symbol parameter min nom max unit note vltgp positive supply voltage/dc portion 22.5 34 v 1 iltg supply current consumption 6 ma 2 oa ambient temperature - 25 25 85 c 3 fc quartz frequency 5.333333 mhz 4 sensitivity against moisture 5 notes: 1 false-poling protection diode to be inserted between pos. as-interface bus line and ltgp-pin. ltgp-pin to be protected furthermore with a voltage clamp between ltgp and ltgn. 2 oscillator on; data transmission stage off; no loads connected 3 power dissipation restrictions as per figure 2 to be observed 4 as-interface quartz 5 level 5 acc. to jedec-standard jesd22-a112 supply pin ltgp positive supply pin connected to positive as-interface bus line and clamped relative to neg. supply pin/ground ltgn as describe d under recommended operating conditions. vltgp and iltg specified under recommended operating conditions as well. symbol parameter min nom max unit note vsig vpp of sin2-data-pulses on top of dc supply voltage 3 8 v z input impedance between 50khz and 300khz 40 pf ccdc = 100nf 18 kohm 50 mh
as2702 ? as-interface slave ic revision 1.3, 21-aug-08 page 5 of 13 buffer pin cdc an external buffer capacitor with a recommended value of 100nf should be connected to this pin to ensure a sufficiently high in put impedance z at power supply pin ltgp. voltage at this pin can be as high as vltgp. nom. 24v power su pply output uout the supply output voltage at uout is directly derived from vltgp and regulated to a level with an offset of about -6v relative to vltgp. uout provides bias to the sensors and actuators circuitry connected to the slave device as well as to the leds connected to outputs led1 and led2. uout is equipped with a thermal overload protection, which foresees that vuout is switched off as soon as the slave device?s substrate temperature tj passes a threshold value in the range of (155 20)c. after tj has come down and has passed a temperature threshold about (15 5)c lower than (155 20)c and after a consecutive minimum delay time of 1s has elapsed, vuout is switched on again. symbol parameter min max unit note vuout power supply output voltage vltgp - 6.3v vltgp - 5.3v v iuout load current 50 ma 1 vcomoff uout voltage level 9.5 10.5 v below which data transmission is inhibited cuout buffer capacitor 10 f 2 notes: 1 in case iuout >40ma and presence of sin2-data pulses on ltgp with vsig >3v, vuout may drop as much as 1v below it?s level in unloaded condition 2 electrolytic and rf filter capacitor in parallel nom. 5v power su pply output u5r the voltage at u5r is derived from the voltage present at uout, as long as uout is not switched off due to overload. in the lat ter case u5r is derived from an alternative voltage out of the uout voltage regulator, which is more or less similar to vuout in no n switched off condition of uout. as a result vu5r is not affected by overload condition at uout and will remain. symbol parameter min max unit vu5r power supply output voltage 4.85 5.15 v iu5r load current 1 ma cu5r buffer capacitor 470 nf oscillator pins osc1 and osc2 the only component to be connected to these pins is a quartz crystal with a resonance frequency of 5.333333 mhz (as-interface quartz crystal). symbol parameter min max unit cx2 stray capacitance 10 pf
as2702 ? as-interface slave ic revision 1.3, 21-aug-08 page 6 of 13 data port pins d3, ?, d0 and data strobe pin dstbn basically data port d3, ?, d0 is designed for bidirectional data transfer out of and into the slave device. each data port pin is equipped with both a low-side open-drain output stage as well as an input stage to this purpose. depending on the so-called io-configuration code, written and stored in the slave device, each data port pin is individually se t to behave as ? output, or ? output/input, or ? input. the timing of the data transfer is presented in figure 3. strobe signal dstbn flags and governs the data transfer as follows: a) data port pin is set ?output?: output data become valid upon the hl-edge of the strobe and will remain so until the next hl-edge, hence during the entire strobe cycle; b) data port pin is set ?output/input?: output data become valid upon the hl-edge of the strobe and will remain so until it?s lh-edge; input data to be valid within a specific time window relative to the hl-edge, after completion of the strobe?s l-phase; c) data port pin is set ?input?: input data to be valid within a specific time window relative to the hl-edge of the strobe, after completion of the strobe?s l-phase. if necessary, output data as per a) and b) can be easily latched with the lh-edge of strobe dstbn as they will remain valid for about 0.4s beyond as a minimum. care must be taken however, that signal delay added by external circuitry is lower for the strobe than for the data. data in data out data in data out t stb t dstbn + 0.4 s t dstbn + t outoff t dstbn t inpmin t inpmax dx dx dstbn figure 3 timing of data transfer at data port d3, ?, d0 relative to strobe dstbn the following table specifies the timing parameters relating to figure 3: symbol parameter min max unit note tstb delay dstbn hl-edge to dx output data valid 1.5 s tdstbn dstbn strobe width 6 6.8 s 1 toutoff delay dstbn lh-edge to dx output off 0.2 1 s 2 tinp input data valid time window 10.5 12.5 s 3
as2702 ? as-interface slave ic revision 1.3, 21-aug-08 page 7 of 13 notes: 1 pulse width depends substantially on value of external pull-up resistor 2 applies only to data port pins set to 'output/input' operation 3 timing reference is dstbn hl-edge. applies only to data port pins set to either 'output/input' or 'input' operation the dc-parameters of the data port pins d3, ?, d0 are specified as follows: symbol parameter min max unit note ioutlo sink current @ output l 10 ma vout = 1v iouthi leakage current @ output off -1 1 a 1 vschlt input threshold voltage 2.5 3.5 v 2 vin acceptable input voltage @ output off -0.3 40 v notes: 1 output stage is low-side open-drain; ext. pull-up resistor required as no pull-up structure on chip 2 no hysteresis implemented to govern the data transfer at data port d3, ?,d0 strobe pin dstbn is equipped with a low-side open-drain output switch plus a passive high-side current source with a nom. 10a pull-up current capability. however a second function is assigned to the dstbn pin which requires it to be input as well: if a low-pulse is imposed on dstb n by external means with a pulse width of at least 50 to 100ms, the slave device will be put in reset condition, as described in section ?reset?. the dc-and timing parameters of strobe pin dstbn are specified as follows: symbol parameter min max unit note ioutlo sink current @ output l 10 ma vout = 1v iouthi leakage current @ output off -10 10 a vout = 5v iinlo input current @ vin = 1v -5 -20 a 1 vschlt input threshold voltage 1.5 3.5 v 2 vin acceptable input voltage @ output off -0.3 40 v tnoreset dstbn l-phase width, not triggering reset 50 ms treset dstbn l-phase width, triggering reset 100 ms cpinext max. stray capacity 20 pf notes: 1 dstbn is equipped with an on-chip pull-up current source, which ensures a sufficiently fast lh-edge upon output switch-off in open-pin condition, to prevent erroneous reset triggering. if dstbn has an external load connected to it, an additional external pull-up resistor may be needed to prevent erroneous reset triggering upon output switch-off. 2 no hysteresis implemented parameter port pins p3, ?, p0 and parameter strobe pin pstbn (note that parameter port pins p3, ?, p0 are only available on as2702 package option soic 20, not on the soic 16 option.) the transfer of data at p3, ?, p0 and the supporting strobe action at pin pstbn takes place similarly as at d3, ?, d0 resp. dst bn. each parameter port pin p3, ?, p0 is equipped with both a low-side open-drain output switch plus a passive, but switchable high - side current source with a nom. 10 a pull-up current capability, and with an input stage. though equipped for bidirectional data transfer as d3, ?, d0, the parameter port is nevertheless less flexible than the data po rt. basically the parameter port is set to behave portwise as
as2702 ? as-interface slave ic revision 1.3, 21-aug-08 page 8 of 13 ? output, or ? input depending on the io-configuration code, written and stored in the slave device. the timing of the data transfer is presented in figure 4. strobe signal pstbn flags and governs the data transfer as follows: a) parameter port is set ?output?: output data become valid upon the hl-edge of the strobe and will remain so until the next hl-edge, hence during the entire strobe cycle; b) parameter port is set ?input?: input data to be valid within a specific time window relative to the hl-edge of the strobe, after completion of the strobe?s l- phase. output data as per a) could be easily latched with the lh-edge of strobe pstbn, if at all necessary. parameter out data in t stb t pstbn + t outoff t pstbn t inpmin t inpmax px px pstbn parameter out figure 4 timing of data transfer at parameter port p3, ?, p0 relative to strobe pstbn the following table specifies the timing parameters relating to figure 4: symbol parameter min max unit note tstb delay pstbn hl-edge to px output data valid 1.5 s tpstbn pstbn strobe width 6 6.8 s 1 tinp input data valid time window 10.5 12.5 s 2 notes: 1 pulse width depends substantially on value of external pull-up resistor 2 timing reference is pstbn hl-edge. applies only to parameter port set to 'input' operation the dc-parameters of the parameter port pins p3, ?, p0 are specified as follows: symbol parameter min max unit note ioutlo sink current @ output l 10 ma vout = 1v iouthi leakage current @ output off -10 10 a vout = 5v iouthi7 leakage current @ output off; pull-up current source off -1 1 a vout = 5v; io-conf. = 7 iinlo input current @ vin = 1v -5 -20 a 1
as2702 ? as-interface slave ic revision 1.3, 21-aug-08 page 9 of 13 symbol parameter min max unit note vschlt input threshold voltage 2.5 3.5 v 2 vin acceptable input voltage @ output off -0.3 40 v notes: 1 the passive high-side current-source provides an about constant input current @ 0v <= vin <= 4v 2 no hysteresis implemented though equipped for bidirectional data transfer as d3, ?, d0, the parameter port is nevertheless less flexible than the data po rt. note the following differences: a) the parameter port is set portwise, the data port bitwise by the io-configuration code; b) the parameter port can only be set to either ?output? or ?input?. a bidirectional behaviour within a strobe cycle is not possib le; c) the parameter port is set to ?output? as a rule; the only exception occurs in case of io-configuration 7 and a master data request, which set it to ?input?. to govern the data transfer at the parameter port p3, ?, p0 strobe pin pstbn is equipped with a low-side open-drain output swit ch plus a passive high-side current source with a nom. 10a pull-up current capability. typically the pstbn-strobe width is about 6s see figure 4. (however to simplify and shorten the component test time of the slave device, the pstbn pin is also used as an in put. input low pulses of more than 50s each will step and cycle th e device through 3 different test modes beyond the regular operat ion as described in this datasheet.) the dc- and timing parameters of strobe pin pstbn are specified as follows: symbol parameter min max unit note ioutlo sink current @ output l 10 ma vout = 1v iouthi leakage current @ output off -10 10 a vout = 5v iinlo input current @ vin = 1v -5 -20 a 1 vschlt input threshold voltage 1.5 3.5 v 2 vin acceptable input voltage @ output off -0.3 40 v tnotm pstbn l-phase width, not triggering test mode 35 s ttm pstbn l-phase width, triggering test mode 50 s cpinext stray capacitance 20 pf notes: 1 pstbn is equipped with an on-chip pull-up current source, which ensures a sufficiently fast lh-edge upon output switch-off in open-pin condition, to prevent erroneous test mode triggering. if pstbn has an external load connected to it, an additional external pull-up resistor may be needed to prevent erroneous test mode triggering upon output switch-off 2 no hysteresis implemented
as2702 ? as-interface slave ic revision 1.3, 21-aug-08 page 10 of 13 operation status pins led1 and led2 pins led1 and led2 are both equipped with a low-side open-drain output switch plus a passive high-side current source with a nom. 10a pull-up current capability. they will each have an led load connected to uout, which will flag the operation status o f the slave device, according to the following table: output led1 output led2 flagging priority slave device reason (green led connected) (red led connected) (1 = highest, ?, 4 = lowest) operation status off off supply voltage off no supply voltage on off regular operation off of 4 no data communication regular, non-zero slave address coded; data comm. watchdog triggered blinks on 3 no regular slave address coded slave address = default zero blinks blinks (alternating with led1) 2 hardware failure in sensor/actuator circuitry input pfault = l off blinks 1 external reset or overload at uout pin dstbn = l to reset, or uout switched-off due to overload (led1 and led2 both also feature an input stage, to simplify component test and shorten test time of the slave device.) the dc- and timing parameters of pins led1 and led2 are specified as follows: symbol parameter min max unit note iled sink current @ output l 10 ma vout = 1v iouthi leakage current @ output off -10 10 a vout = 5v vin acceptable input voltage @ output off -0.3 40 v fblink blinking frequency 2 3 hz data communication watchdog as2702 is equipped with a watchdog timer to supervise data communication by monitoring the strobe signals at pins dstbn and pstbn. if a parameter or data strobe is not followed by a consecutive strobe within a time period of 50 ? 100ms, the watchdog is trigg ered and initiates a ?soft? reset, see section reset. reset there are 2 categories of reset-events, leading to 2 slightly different reset-conditions of the slave device: 1 a ?hard? reset taking place at power-up and power-down of supply-voltages u5r and uout. at power-up the slave device leaves reset-condition as soon as u5r has passed 3.75v and uout has passed vcomoff = nom. 10v. at power-down the slave device is forced into reset-condition as soon as u5r drops below 3.75v. (tolerance of the threshold voltages referred to is 5 %) 2 a ?soft? reset, resulting from one of the following events: 2.1 data strobe pin dstbn is kept l for more than 100ms; 2.2 master command ?reset slave? is received; 2.3 master command ?reset broadcast? is received; 2.4 the communication watchdog is triggered.
as2702 ? as-interface slave ic revision 1.3, 21-aug-08 page 11 of 13 a ?hard? reset event conditions the slave device as follows: ? internal states (counters, flags, ?) are reset ? the slave device?s receiver is desynchronized from the as-interface bus ? the low-side open-drain output stages at ports d3, ?, d0 and ports p3, ?, p0 are switched off ? any test mode will be cancelled a ?soft? reset has the following consequences: ? a regular, nominal 6s l-phase strobe is generated on both the dstbn and pstbn pin ? the low-side open-drain output stages at ports d3, ?, d0 and ports p3, ?, p0 are switched off ? internal states (counters, flags, ?) are rest, however the following states and operations are not affected: ? the timer function which controls blinking of led1 and led2 ? the data communication ? any test mode ? any eeprom write operation remark: if uout drops below vcomoff = nom. 10v data communication with the as-interface bus is aborted by the receiver or transmitter of the slave device. as long as u5r does not drop below 3.75v in this situation, no ?hard? reset takes place; however the data communication watchdog will be triggered (unless disabled) and a ?soft? reset will result. eeprom as2702 has a 16 x 8 bits serial interface eeprom on board to store the slave unit?s address an d set-up data in a non-volatile fashion. the eeprom stores the following data: eeprom-address data relevant no. of bits programmed by note 0, 1 slave address 5 + 1 master (initialization) 1 2 settings (eid1) 4 master (initialization) 3 settings (io-conf.) 5 slave unit manufacturer 4 settings (id) 5 slave unit manufacturer 5 settings (eid2) 5 slave unit manufacturer 6 settings (control-code) 5 slave unit manufacturer note: 1 6 bits (a4, ?, a0 + sel-bit) in extended address mode: 62 slaves addressable; 5 bits (a4, ?, a0) in non-extended address mode: 31 slaves addressable obviously the capacity of the eeprom is only partially used. reading and writing of the eeprom is performed by tewise and trough temporary, volatile registers. writing of data from the volatile register into the eeprom takes about 10ms per byte, whereas reading takes less than 1ms per byte. upon reset the eeprom info is read into temporary register, including the slave?s address which has been written redundantly into eeprom locations 0 and 1 before. the temporary registers receiving the address are compared for similarity; in case of non-similarity ? which e.g. may have been caused by a supply voltage dip during address writing ? the slave will flag non-regular operation status/slave address zero.
as2702 ? as-interface slave ic revision 1.3, 21-aug-08 page 12 of 13 as-interface bus communication all slaves connected to an as-interface bus are sequentially and cyclicly called by the master in a string of individual transa ctions between the master and each slave unit. a transaction consists of a 14 bits master request, typically containing the slave?s address as well as data or parameter info, and an immediate acknowledging slave response of 7 bits. the 14 bits master request ? apart from start bit st = 0 and end bit eb = 1 ? has the following contents: ? 1 control bit cb: cb = 0 stands for data transfer (typ. data or parameters) cb = 1 identifies command-type requests ? 5 address bits: a4, ?, a0 ? 5 information bits: i4, ?, i0 (typ. data or parameters) ? 1 parity bit pb as2702 allows for up to 62 slaves on the same as-interface bus; this requires a slave address extended to 6 bits, hence an extr a bit beyond a4, ?, a0. information bit i3 is used as the 6 th address bit in this so-called extended address mode. it is called sel-bit, as it is perceived as to select between a-slave (sel = 0) and b-slave (sel = 1) at address location a4, ?, a0. in non-extended address mode as2702 is addressed with a4, ?, a0 only ? for a max. total of 31 slaves per as-interface bus system, and is system compatible with existing slave device as2701a. the 7 bits slave response ? apart from start bit st = 0 and end bit eb = 1 ? has the following contents: ? 4 information bits: i4, ?, i0 (typ. data or parameters) ? 1 parity bit pb application support for general information and documentation on the as-interface concept you may contact the as-interface association: as-international association zum taubengarten 52 d-63571 gelnhausen tel.: +49-6051-473212 fax: +49-6051-473282 e-mail: info@as-interface.net http:// www.as-interface.net ordering information as2702-20t package: soic 20; delivery: tape & reel as2702-16t package: soic 16w; delivery: tape & reel; no parameter port available as2702-20 package: soic 20; delivery: tubes as2702-16 package: soic 16w; delivery: tubes; no parameter port available
as2702 ? as-interface slave ic revision 1.3, 21-aug-08 page 13 of 13 contact information headquarters austriamicrosystems ag a-8141 schloss premstaetten, austria tel: +43 (0) 3136 500 0 fax: +43 (0) 3136 525 01 for sales offices, distributors an d representatives, please visit: http://www.austriamicrosystems.com copyright copyright ? 2003 austriamicrosystems. trademarks registered ?. all rights reserved. the material herein may not be reproduced, adapted, merged, translated, stored, or used without the prior written consent of the copyright owner. to the best of its knowl edge, austriamicrosystems asserts that the information contai ned in this publication is accurate and correct.

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