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. Rear Window Heating Timer/ Long-term Timer The delay time can be interrupted manually, but a retrigger function is not provided. Figure 1. Block Diagram with External Circuit C2 U6046B 47 mF R2 OSC 6 Oscillator Vstab 7 VS C1 8 Stabilization Power-on reset Load-dump detection R1 510 W VBatt 1 GND Frequency divider 3 ON 4 OFF Debouncing Mono-flop Relay control output 2 OUT 5 TOGGLE 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 2 Pin Symbol Function 1 GND Reference point, ground 2 OUT Relay control output 3 ON Switch-on input 4 OFF Switch-off input 5 TOGGLE Toggle input 6 OSC RC-oscillator input 7 VSTAB Stabilized voltage 8 VS Supply voltage 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 µF. 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 510 W R1 C2 C1 R2 47 mF/ 16 V 8 6 7 5 U6046B 1 4 3 2 Figure 4. Basic Circuit for VS = 5 V VBatt C2 R2 VS = 5 V 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) 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. Interference Voltages and Load-dump 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 4 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. U6046B 4674A–AUTO–01/03 U6046B Figure 5. TOGGLE Function V Batt 510 W R1 S1 C2 C1 R2 47 mF/ 16 V 8 7 20 kW 6 5 3 4 U6046B 1 Relay Control Output Behavior (Pin 2) 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 k W ) ( 12 – 7 ) V I = ------------------------- » 0.25 mA 20 k W It can be increased by connecting a 5.6 k W resistor from the push-button switch to ground as shown in Figure 12. Figure 6. ON/OFF Function S3 VBatt R1 510 W C1 C2 R2 47 mF/ 16 V 8 7 20 kW 6 5 3 4 20 kW U6046B 1 6 2 U6046B 4674A–AUTO–01/03 U6046B Timing Waveform Figure 7. Behavior of the Relay Control Output as a Function of Input Condition Diagram 5A Pin 5 Toggle Relay t3 Pin 2 t3 t3 t3 t3 t3 td Diagram 5B ON OFF Pin 3 t3 Pin 4 t3 Pin 2 Relay t3 t3 t3 t3 t3 t3 td Diagram 5C Pin 3 ON Pin 4 OFF Relay Pin 2 td t3 Figure 8. Input Circuit U6046B 2V VBatt S R Pin 3, 4, 5 + 20 kW 20 kW 7V 15 pF Absolute Maximum Ratings Parameters Symbol Value Unit Operating voltage, static, 5 min VBatt 24 V Ambient temperature range Tamb -40 to +125 °C Storage temperature range Tstg -55 to +125 °C Tj 150 °C Symbol Value Unit RthJA RthJA 120 160 K/W K/W Junction temperature Thermal Resistance Parameters Junction ambient DIP8 SO8 7 4674A–AUTO–01/03 Electrical Characteristics VBatt =13.5 V, Tamb = 25°C, reference point ground, Figure 2, unless otherwise specified No. Parameters Test Conditions 1.1 Operating voltage R1 ³ 510 W t < 5 min t < 60 min Symbol Min. VBatt 6 1.2 5 V supply Without R1, C1, Figure 4 1.3 Stabilized voltage VBatt = 12 V 1.4 Undervoltage threshold Power on reset 1.5 Supply current All push buttons open 8 I8 1.6 Internal Z-diode I8 = 10 mA 8 V8 2 2.1 2.2 2.3 3 Relay Control Output Saturation voltage Leakage current 7, 8 V8, V7 4.3 7 V7 5.0 V8 3.0 13.5 Typ. Max. Unit 16 24 18 V 6.0 V 5.2 5.4 V 4.2 V 1.3 2.0 mA 14 16 V 2 I2 = 200 mA I2 = 300 mA V2 V2 = 14 V I2 1.2 V 1.5 Output current 2 100 µA I2 300 mA 1.5 A Ouput Pulse Current 3.1 Load dump pulse t £ 300 ms I2 3.2 Internal Z-diode I2 = 10 mA V2 20 22 24 V 4 8 Pin Oscillator Input f = 0.001 to 40 kHz, See Table 1 6 4.1 Internal discharge resistance V6 = 5 V R6 1.6 2.0 2.4 kW 4.2 Switching voltage Lower Upper V6L V6H 0.9 2.8 1.1 3.1 1.4 3.5 V 4.3 Input current V6 = 0 V -I6 1 µA 5 Switching Time 5.1 Debounce time t3 5 7 cycles 5.2 Delay time td 72704 74752 cycles V3,4,5 1.6 2.0 2.4 V 6 Inputs ON, OFF, TOGGLE 6.1 Switching threshold voltage 3, 4, 5 6.2 Internal Z-diode I3, 4, 5 = 10 mA V3,4,5 6.5 7.1 8.0 V 6.3 Pull-down resistance V3,4,5 = 5 V R3,4,5 13 20 50 kW U6046B 4674A–AUTO–01/03 U6046B Table 1. Dimensioning for Oscillator Frequency, Debounce Time and Delay Time Frequency f Debounce Time t3 Hz ms min Delay Time td 1 6000 1229 4700 280 2 3000 614 1000 650 3 2000 410 1000 440 4 1500 307 1000 330 5 1200 246 1000 260 6 1000 205 1000 220 7 857 176 1000 190 8 750 154 1000 160 9 667 137 1000 140 10 600 123 1000 130 20 300 61 100 650 30 200 41 100 440 40 150 31 100 330 50 120 25 100 260 60 100 20 100 220 70 86 18 100 190 80 75 15 100 160 90 67 14 100 140 100 60 12 100 130 200 30 369 10 600 300 20 246 10 400 400 15 184 10 300 500 12 147 10 240 600 10 123 10 200 700 9.00 105 10 170 800 8.00 92 10 150 900 7.00 82 10 130 1000 6.00 74 10 120 2000 3.00 37 1 600 3000 2.00 25 1 400 4000 1.50 18 1 300 5000 1.20 15 1 240 6000 1.00 12 1 200 7000 0.86 11 1 170 8000 0.75 9 1 150 9000 0.67 8 1 130 10000 0.60 7 1 120 11000 0.55 6.7 1 110 12000 0.50 6.1 1 99 13000 0.46 5.7 1 91 14000 0.43 5.3 1 85 15000 0.40 4.9 1 79 16000 0.38 4.6 1 74 17000 0.35 4.3 1 70 18000 0.33 4.1 1 66 19000 0.32 3.9 1 62 20000 0.30 3.7 1 59 s C2 R2 nF kW 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 510 W R1 C2 R2 C1 47 mF/ 16 V 7 8 6 5 3 4 U6046B 1 2 Figure 10. Generation of a Monostable Delay Time, td, by Applying the Operating Voltage VBatt, Deactivatable by the OFF Push-button VBatt 510 W R1 47 mF/ 16 V C2 R2 C1 20 kW 8 7 6 5 3 4 U6046B 1 2 4.7 mF 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 510 W R1 C2 C1 47 mF/ 16 V R2 7 8 6 5 3 4 U6046B 1 2 Figure 12. Increasing the Contact Current by Parallel Resistors VBatt 2 mA 5.6 kW 8 7 6 5.6 kW 5 20 kW 20 kW U6046B 1 2 3 4 11 4674A–AUTO–01/03 Ordering Information Extended Type Number Package U6046B DIP8 U6046B-FP SO8 Remarks Package Information Package DIP8 Dimensions in mm 7.77 7.47 9.8 9.5 1.64 1.44 4.8 max 6.4 max 0.5 min 3.3 0.58 0.48 0.36 max 9.8 8.2 2.54 7.62 8 5 technical drawings according to DIN specifications 1 4 Package SO8 Dimensions in mm 5.2 4.8 5.00 4.85 3.7 1.4 0.25 0.10 0.4 1.27 6.15 5.85 3.81 8 0.2 3.8 5 technical drawings according to DIN specifications 1 12 4 U6046B 4674A–AUTO–01/03 Atmel Headquarters Atmel Operations Corporate Headquarters Memory 2325 Orchard Parkway San Jose, CA 95131 TEL 1(408) 441-0311 FAX 1(408) 487-2600 Europe Atmel Sarl Route des Arsenaux 41 Case Postale 80 CH-1705 Fribourg Switzerland TEL (41) 26-426-5555 FAX (41) 26-426-5500 Asia Room 1219 Chinachem Golden Plaza 77 Mody Road Tsimhatsui East Kowloon Hong Kong TEL (852) 2721-9778 FAX (852) 2722-1369 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 2325 Orchard Parkway San Jose, CA 95131 TEL 1(408) 441-0311 FAX 1(408) 436-4314 Microcontrollers 2325 Orchard Parkway San Jose, CA 95131 TEL 1(408) 441-0311 FAX 1(408) 436-4314 La Chantrerie BP 70602 44306 Nantes Cedex 3, France TEL (33) 2-40-18-18-18 FAX (33) 2-40-18-19-60 ASIC/ASSP/Smart Cards Zone Industrielle 13106 Rousset Cedex, France TEL (33) 4-42-53-60-00 FAX (33) 4-42-53-60-01 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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