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| Features * * * * * * * * * Delay Time Range: 3.7 s to 20 h RC Oscillator Determines Timing Characteristics Relay Driver with Z-diode Debounced Input for Toggle Switch Two Debounced Inputs: ON and OFF Load-dump Protection RF Interference Protected Protection According to ISO/TR7637-1 (VDE 0839) Inputs Switched to VBatt Description The bi-polar long-term timer U6046B is designed to automatically limit the operation time of high loads in the harsh automotive enviroment with a preset delay time. With the power-on-reset function the timers guarantee that current consuming devices are not operated unintentionally. The delay time can be interrupted manually, but a retrigger function is not provided. Figure 1. Block Diagram with External Circuit 47 mF Vstab VS Rear Window Heating Timer/ Long-term Timer U6046B C2 OSC 6 R2 C1 R1 7 8 510 W VBatt Oscillator Stabilization Power-on reset Load-dump detection 1 GND Frequency divider 3 ON 4 OFF 5 TOGGLE Debouncing Mono-flop Relay control output 2 OUT Rev. 4674A-AUTO-01/03 1 Pin Configuration Figure 2. Pinning GND 1 8 VS OUT 2 7 VSTAB ON 3 6 OSC OFF 4 5 TOGGLE Pin Description Pin 1 2 3 4 5 6 7 8 Symbol GND OUT ON OFF TOGGLE OSC VSTAB VS Function Reference point, ground Relay control output Switch-on input Switch-off input Toggle input RC-oscillator input Stabilized voltage Supply voltage 2 U6046B 4674A-AUTO-01/03 U6046B Functional Description Power Supply (Pin 8) For reasons of interference protection and surge immunity, the supply voltage (pin 8) must be provided with an RC circuit as shown in Figure 3. Dropper resistor, R1, limits the current in case of overvoltage, whereas C1 smoothes the supply voltage at pin 8. Recommended values are: R1 = 510 W, C1 = 47 F. The integrated Z-diode (14 V) protects the supply voltage, VS. Therefore, the operation of the IC is possible between 6 V and 16 V, supplied by VBatt. However, it is possible to operate the integrated circuit with a 5 V supply, but it should be free of interference voltages. In this case, pin 7 is connected to pin 8 as shown in Figure 4, and the R1C1 circuit is omitted. Figure 3. Basic Circuit for 12 V Supply and Oscillator VBatt C1 R1 510 W R2 C2 47 mF/ 16 V 8 7 6 5 U6046B 1 2 3 4 Figure 4. Basic Circuit for VS = 5 V C2 VS = 5 V R2 VBatt 8 7 6 5 U6046B 1 2 3 4 3 4674A-AUTO-01/03 Oscillator (Pin 6) The external components R2 and C2 determine the oscillator frequency. The capacitor C2 is charged by R2 and discharged by an integrated 2-kW resistor. A stable oscillator frequency with minimal influence of the temperature coefficient of the integrated resistor is achieved with R2 >> 2 kW. Oscillator frequency, f, is calculated as follows: 1 f = -------------t1 + t2 where t1 = charge time = a1 R2 C2 t2 = discharge time = a2 2 kW C2 a1 and a2 are constants as such a1 = 0.833 and a2 = 1.551 when C2 = 470 pF to 10 nF a1 = 0.746 and a2 = 1.284 when C2 = 10 nF to 4700 nF The debounce time, t3, and the delay time, td, depend on the oscillator frequency, f, as follows: 1 t 3 = 6 -f 1 t d = 73728 -f Table 1 shows relationships between t3, td, C2, R2 and frequencies from 1 Hz to 20 kHz. Relay Control Output (OUT) Interference Voltages and Load-dump The relay control output is an open-collector Darlington circuit with an integrated 23-V Z-diode to limit the inductive cut-off pulse of the relay coil. The maximum static collector current must not exceed 300 mA and saturation voltage is typically 1.1 V at 200 mA. The lC supply is protected by R1, C1, and an integrated Z-diode, while the inputs are protected by a series resistor, integrated Z-diode and RF capacitor (see Figure 8). The relay control output is protected via the integrated 23-V Z-diode in the case of short interference peaks. It is switched to a conductive condition for a battery voltage of greater than approximate 40 V in the case of a load-dump. The output transistor is dimensioned so that it can withstand the current produced. Power-on Reset When the operating voltage is switched on, an internal power-on reset pulse (POR) is generated which sets the logic of the circuits to a defined initial condition. The relay output is disabled. 4 U6046B 4674A-AUTO-01/03 U6046B Figure 5. TOGGLE Function V Batt R1 C1 47 mF/ 16 V 8 510 W C2 R2 S1 20 kW 7 6 5 U6046B 1 2 3 4 Relay Control Output Behavior (Pin 2) Time functions (relay output) can be started or interrupted by the three inputs i.e., ON, OFF or TOGGLE (pins 3, 4 and 5). The relay becomes active if the time function is triggered, and the relay contact is interrupted after the elapse of delay time, td. There are two input possibilities: Toggle Input When the push-button (TOGGLE) switch, S1 , is pressed for the first time, the relay becomes active after the debounce time, t3, i.e., the relay output, pin 2, is active (see Figure 5). Renewed operation of S1 causes the interruption of the relay contact and the relay is disabled. Each operation of the toggle switch, S1, changes (alters) the condition of the relay output when the debounce time, t3, is exceeded i.e., the TOGGLE function. If the relay output is not disabled by pressing the switch S1, the output is active until the delay time, td, is over. ON, OFF Inputs (Pins 3 and 4) To avoid simultaneous operation of both inputs, pin 3 (ON) and pin 4 (OFF), use of twoway contacts with a centre-off position with spring returns (also known as rocker-actuated switch) is recommended (see Figure 6). Pressing the push-button switch (pin 3-ON) leads to the activation of the relay after the debounce time, t3, whereas the switching of the Pin 4 switch correspondingly leads to the relay being de-energized. If the relay is not de-energized by the push-button switch, it becomes disabled after the delay time, td, is over. Combined operation, TOGGLE and ON/OFF is not possible because both inputs are connected to the same debounce stage. Debouncing functions on both edges i.e., whenever S1 is ON or OFF. If pin 3 (input ON) is continuously closed, the delay time, td, still elapses and the relay is interrupted. This can be used to generate a defined power-on-reset pulse to trigger, for example, a delay time, td, when the battery voltage, VBatt, is applied. 5 4674A-AUTO-01/03 Figure 8 shows the input circuit of U6046B. It has an integrated pull-down resistance (20 kW), RF capacitor (15 pF) and Z-diode (7 V). It reacts to voltages greater than 2 V. The external protective resistor has a value of 20 kW and the push-button switch, S, is connected to the battery as shown in the diagram. Contact current, I, is calculated as follows: VBatt - V Z I = ------------------------------ where VBatt =12 V, VZ =7 V R ( = 20 kW ) ( 12 - 7 )V I = ------------------------ 0.25 mA 20 kW It can be increased by connecting a 5.6 kW resistor from the push-button switch to ground as shown in Figure 12. Figure 6. ON/OFF Function VBatt R1 C1 47 mF/ 16 V 8 510 W R2 C2 20 kW S3 20 kW 7 6 5 U6046B 1 2 3 4 6 U6046B 4674A-AUTO-01/03 U6046B Timing Waveform Figure 7. Behavior of the Relay Control Output as a Function of Input Condition Diagram 5A Toggle Relay Pin 5 t3 t3 Diagram 5B Pin 2 t3 t3 t3 t3 td Pin 3 ON OFF t 3 Pin 4 t 3 Relay Pin 2 t3 Diagram 5C t3 t3 t3 t3 t3 td Pin 3 ON OFF Relay Pin 4 Pin 2 td t3 Figure 8. Input Circuit U6046B 2V VBatt S R 20 kW 7V 15 pF 20 kW Pin 3, 4, 5 + Absolute Maximum Ratings Parameters Symbol Value Unit Operating voltage, static, 5 min Ambient temperature range Storage temperature range Junction temperature VBatt Tamb Tstg Tj 24 -40 to +125 -55 to +125 150 V C C C Thermal Resistance Parameters Symbol Value Unit Junction ambient DIP8 SO8 RthJA RthJA 120 160 K/W K/W 7 4674A-AUTO-01/03 Electrical Characteristics VBatt =13.5 V, Tamb = 25C, reference point ground, Figure 2, unless otherwise specified No. Parameters Test Conditions Pin Symbol Min. Typ. Max. Unit 1.1 Operating voltage R1 510 W t < 5 min t < 60 min Without R1, C1, Figure 4 VBatt = 12 V Power on reset All push buttons open I8 = 10 mA I2 = 200 mA I2 = 300 mA V2 = 14 V 8 8 2 VBatt 6 16 24 18 6.0 5.2 1.3 5.4 4.2 2.0 16 14 1.2 1.5 2 100 300 1.5 V V V V mA V V A mA A V kW V A cycles cycles V V kW 1.2 1.3 1.4 1.5 1.6 2 5 V supply Stabilized voltage Undervoltage threshold Supply current Internal Z-diode Relay Control Output 7, 8 7 V8, V7 V7 V8 I8 V8 V2 I2 I2 4.3 5.0 3.0 13.5 2.1 2.2 2.3 3 Saturation voltage Leakage current Output current Ouput Pulse Current 3.1 3.2 4 Load dump pulse Internal Z-diode Internal discharge resistance Switching voltage Input current Switching Time t 300 ms I2 = 10 mA 6 I2 V2 R6 V6L V6H -I6 t3 td 3, 4, 5 20 1.6 0.9 2.8 22 2.0 1.1 3.1 24 2.4 1.4 3.5 1 Oscillator Input f = 0.001 to 40 kHz, See Table 1 4.1 4.2 4.3 5 V6 = 5 V Lower Upper V6 = 0 V 5.1 5.2 6 Debounce time Delay time Inputs ON, OFF, TOGGLE 5 72704 1.6 6.5 13 2.0 7.1 20 7 74752 2.4 8.0 50 6.1 6.2 6.3 Switching threshold voltage Internal Z-diode Pull-down resistance I3, 4, 5 = 10 mA V3,4,5 = 5 V V3,4,5 V3,4,5 R3,4,5 8 U6046B 4674A-AUTO-01/03 U6046B Table 1. Dimensioning for Oscillator Frequency, Debounce Time and Delay Time Frequency f Hz 1 2 3 4 5 6 7 8 9 10 20 30 40 50 60 70 80 90 100 200 300 400 500 600 700 800 900 1000 2000 3000 4000 5000 6000 7000 8000 9000 10000 11000 12000 13000 14000 15000 16000 17000 18000 19000 20000 Debounce Time t3 ms 6000 3000 2000 1500 1200 1000 857 750 667 600 300 200 150 120 100 86 75 67 60 30 20 15 12 10 9.00 8.00 7.00 6.00 3.00 2.00 1.50 1.20 1.00 0.86 0.75 0.67 0.60 0.55 0.50 0.46 0.43 0.40 0.38 0.35 0.33 0.32 0.30 Delay Time td min 1229 614 410 307 246 205 176 154 137 123 61 41 31 25 20 18 15 14 12 369 246 184 147 123 105 92 82 74 37 25 18 15 12 11 9 8 7 6.7 6.1 5.7 5.3 4.9 4.6 4.3 4.1 3.9 3.7 s C2 nF 4700 1000 1000 1000 1000 1000 1000 1000 1000 1000 100 100 100 100 100 100 100 100 100 10 10 10 10 10 10 10 10 10 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 R2 kW 280 650 440 330 260 220 190 160 140 130 650 440 330 260 220 190 160 140 130 600 400 300 240 200 170 150 130 120 600 400 300 240 200 170 150 130 120 110 99 91 85 79 74 70 66 62 59 9 4674A-AUTO-01/03 Applications Figure 9. Generation of a Monostable Delay Time, td, Caused by Applying the Operating Voltage VBatt, not Externally Deactivatable VBatt R1 C1 47 mF/ 16 V 510 W R2 C2 8 7 6 5 U6046B 1 2 3 4 Figure 10. Generation of a Monostable Delay Time, td, by Applying the Operating Voltage VBatt, Deactivatable by the OFF Push-button VBatt R1 C1 47 mF/ 16 V 510 W R2 C2 20 kW 8 7 6 5 U6046B 1 2 3 4.7 mF 4 10 U6046B 4674A-AUTO-01/03 U6046B Figure 11. Monostable Delay Time, td, can be Activated by the ON Push-button, not Externally Deactivatable VBatt R1 C1 47 mF/ 16 V 510 W R2 C2 8 7 6 5 U6046B 1 2 3 4 Figure 12. Increasing the Contact Current by Parallel Resistors VBatt 2 mA 5.6 kW 5.6 kW 8 7 6 5 20 kW 20 kW U6046B 1 2 3 4 11 4674A-AUTO-01/03 Ordering Information Extended Type Number Package Remarks U6046B U6046B-FP DIP8 SO8 Package Information Package DIP8 Dimensions in mm 9.8 9.5 1.64 1.44 7.77 7.47 4.8 max 6.4 max 0.5 min 3.3 0.58 0.48 7.62 8 5 2.54 0.36 max 9.8 8.2 technical drawings according to DIN specifications 1 4 Package SO8 Dimensions in mm 5.00 4.85 1.4 0.4 1.27 3.81 8 5 0.25 0.10 5.2 4.8 3.7 0.2 3.8 6.15 5.85 technical drawings according to DIN specifications 1 4 12 U6046B 4674A-AUTO-01/03 Atmel Headquarters Corporate Headquarters 2325 Orchard Parkway San Jose, CA 95131 TEL 1(408) 441-0311 FAX 1(408) 487-2600 Atmel Operations Memory 2325 Orchard Parkway San Jose, CA 95131 TEL 1(408) 441-0311 FAX 1(408) 436-4314 RF/Automotive Theresienstrasse 2 Postfach 3535 74025 Heilbronn, Germany TEL (49) 71-31-67-0 FAX (49) 71-31-67-2340 1150 East Cheyenne Mtn. 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Blvd. Colorado Springs, CO 80906 TEL 1(719) 576-3300 FAX 1(719) 540-1759 Scottish Enterprise Technology Park Maxwell Building East Kilbride G75 0QR, Scotland TEL (44) 1355-803-000 FAX (44) 1355-242-743 Japan 9F, Tonetsu Shinkawa Bldg. 1-24-8 Shinkawa Chuo-ku, Tokyo 104-0033 Japan TEL (81) 3-3523-3551 FAX (81) 3-3523-7581 literature@atmel.com Web Site http://www.atmel.com (c) Atmel Corporation 2003. Atmel Corporation makes no warranty for the use of its products, other than those expressly contained in the Company's standard warranty which is detailed in Atmel's Terms and Conditions located on the Company's web site. The Company assumes no responsibility for any errors which may appear in this document, reserves the right to change devices or specifications detailed herein at any time without notice, and does not make any commitment to update the information contained herein. No licenses to patents or other intellectual property of Atmel are granted by the Company in connection with the sale of Atmel products, expressly or by implication. Atmel's products are not authorized for use as critical components in life support devices or systems. Atmel (R) is the registered trademark of Atmel. Other terms and product names may be the trademarks of others. Printed on recycled paper. 4674A-AUTO-01/03 xM |
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