Features • • • • • • • • • Delay Time Range: 3.7s to 20h 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 Rear Window Heating Timer/ Long-term Timer 1. Description The bi-polar long-term timer U6046B is designed to automatically limit the operation time of high loads in the harsh automotive environment with a preset delay time. With the power-on-reset function the timers guarantee that current consuming devices are not operated unintentionally. U6046B The delay time can be interrupted manually, but a retrigger function is not provided. Figure 1-1. Block Diagram with External Circuit C2 47 µF R2 OSC 6 Oscillator Vstab 7 VS C1 8 Stabilization Power-on reset Load-dump detection R1 510 Ω VBatt 1 GND Frequency divider 3 ON 4 OFF Debouncing Mono-flop Relay control output 2 OUT 5 TOGGLE Rev. 4674B–AUTO–09/05 2. Pin Configuration Figure 2-1. Table 2-1. 2 Pinning GND 1 8 VS OUT 2 7 VSTAB ON 3 6 OSC OFF 4 5 TOGGLE Pin Description 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 6 OSC 7 VSTAB 8 VS Toggle input RC-oscillator input Stabilized voltage Supply voltage U6046B 4674B–AUTO–09/05 U6046B 3. Functional Description 3.1 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 3-1. Dropper resistor, R1, limits the current in case of overvoltage, whereas C1 smooths the supply voltage at pin 8. Recommended values are: R1 = 510Ω, C1 = 47 µF. The integrated Z-diode (14V) protects the supply voltage, VS. Therefore, the operation of the IC is possible between 6V and 16V, supplied by VBatt. However, it is possible to operate the integrated circuit with a 5V supply, but it should be free of interference voltages. In this case, pin 7 is connected to pin 8 as shown in Figure 3-2 on page 4, and the R1C1 circuit is omitted. Figure 3-1. Basic Circuit for 12V Supply and Oscillator VBatt 510 Ω R1 C2 C1 R2 47 µF/ 16 V 8 7 6 5 U6046B 1 2 3 4 3 4674B–AUTO–09/05 Figure 3-2. Basic Circuit for VS = 5V VBatt C2 R2 VS = 5 V 8 6 7 5 U6046B 1 3.2 2 3 4 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-kΩ resistor. A stable oscillator frequency with minimal influence of the temperature coefficient of the integrated resistor is achieved with R2 >> 2 kΩ. Oscillator frequency, f, is calculated as follows: 1 f = --------------t1 + t2 where t1 = charge time = α1 × R2 × C2 t2 = discharge time = α2 × 2 kΩ × C2 α1 and α2 are constants as such α1 = 0.833 and α2 = 1.551 when C2 = 470 pF to 10 nF α1 = 0.746 and α2 = 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 6-1 on page 10 shows relationships between t3, td, C2, R2 and frequencies from 1 Hz to 20 kHz. 4 U6046B 4674B–AUTO–09/05 U6046B 3.3 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 1.1V at 200 mA. 3.4 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 3-6 on page 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 40V in the case of a load-dump. The output transistor is dimensioned so that it can withstand the current produced. 3.5 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. Figure 3-3. TOGGLE Function V Batt 510 Ω R1 S1 C2 C1 R2 47 µF/ 16 V 8 7 20 kΩ 6 5 3 4 U6046B 1 2 5 4674B–AUTO–09/05 3.6 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: 3.6.1 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 3-3 on page 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. 3.6.2 ON, OFF Inputs (Pins 3 and 4) To avoid simultaneous operation of both inputs, pin 3 (ON) and pin 4 (OFF), use of two-way contacts with a centre-off position with spring returns (also known as rocker-actuated switch) is recommended (see Figure 3-4 on page 7). 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. Figure 3-6 on page 8 shows the input circuit of U6046B. It has an integrated pull-down resistance (20 kΩ), RF capacitor (15 pF) and Z-diode (7V). It reacts to voltages greater than 2V. The external protective resistor has a value of 20 kΩ and the push-button switch, S, is connected to the battery as shown in the diagram. Contact current, I, is calculated as follows: V Batt – V Z I = ----------------------------- where VBatt =12V, VZ =7V R ( = 20 k Ω) ( 12 – 7 ) V I = ------------------------- ≈ 0.25 mA 20 k Ω 6 U6046B 4674B–AUTO–09/05 U6046B It can be increased by connecting a 5.6 kΩ resistor from the push-button switch to ground as shown in Figure 7-4 on page 13. Figure 3-4. ON/OFF Function S3 VBatt R1 510 Ω C1 C2 R2 47 µF/ 16 V 8 7 20 kΩ 6 5 3 4 20 kΩ U6046B 1 2 7 4674B–AUTO–09/05 3.7 Timing Waveform Figure 3-5. 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 3-6. Input Circuit U6046B 2V VBatt S R Pin 3, 4, 5 + 20 kΩ 20 kΩ 7V 15 pF 8 U6046B 4674B–AUTO–09/05 U6046B 4. Absolute Maximum Ratings Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. This is a stress rating only and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of this specification is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. 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 5. Thermal Resistance Parameters Junction ambient DIP8 SO8 6. Electrical Characteristics VBatt =13.5V, Tamb = 25°C, reference point ground, Figure 2-1 on page 2, unless otherwise specified No. Parameters Test Conditions 1.1 Operating voltage R1 ≥ 510Ω t < 5 min t < 60 min 1.2 5V supply Without R1, C1, Figure 3-2 on page 4 1.3 Stabilized voltage VBatt = 12V 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 Pin Symbol Min. Typ. Unit VBatt 6 16 24 18 7, 8 V8, V7 4.3 6.0 V 7 V7 5.0 5.4 V V8 3.0 4.2 V 1.3 2.0 mA 14 16 V 13.5 5.2 V Relay Control Output, Pin 2 2.1 Saturation voltage I2 = 200 mA I2 = 300 mA V2 1.2 2.2 Leakage current V2 = 14V I2 2 2.3 Output current 3 Max. I2 1.5 V 100 µA 300 mA Output Pulse Current 3.1 Load dump pulse t ≤ 300 ms I2 1.5 A 3.2 Internal Z-diode I2 = 10 mA V2 20 22 24 V 4 Oscillator Input f = 0.001 to 40 kHz, See Table 6-1 on page 10, Pin 6 4.1 Internal discharge resistance V6 = 5V R6 1.6 2.0 2.4 kΩ 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 = 0V -I6 1 µA 9 4674B–AUTO–09/05 6. Electrical Characteristics (Continued) VBatt =13.5V, Tamb = 25°C, reference point ground, Figure 2-1 on page 2, unless otherwise specified No. Parameters 5 Pin Symbol Min. Typ. Max. Unit Switching Time 5.1 Debounce time 5.2 t3 5 7 cycles td 72704 74752 cycles V3,4,5 1.6 2.0 2.4 V Delay time 6 Inputs ON, OFF, TOGGLE; Pins 3, 4, 5 6.1 Switching threshold voltage 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 = 5V R3,4,5 13 20 50 kΩ Table 6-1. 10 Test Conditions Dimensioning for Oscillator Frequency, Debounce Time and Delay Time Frequency f Debounce Time t3 Delay Time td C2 R2 Hz ms min nF kΩ 1 6000 2 3000 1229 4700 280 614 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 s 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 U6046B 4674B–AUTO–09/05 U6046B Table 6-1. Dimensioning for Oscillator Frequency, Debounce Time and Delay Time (Continued) Frequency f Debounce Time t3 Delay Time td min C2 R2 Hz ms s nF kΩ 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 11 4674B–AUTO–09/05 7. Applications Figure 7-1. Generation of a Monostable Delay Time, td, Caused by Applying the Operating Voltage VBatt, not Externally Deactivatable VBatt 510 Ω R1 C2 R2 C1 47 µF/ 16 V 7 8 6 5 3 4 U6046B 1 Figure 7-2. 2 Generation of a Monostable Delay Time, td, by Applying the Operating Voltage VBatt, Deactivatable by the OFF Push-button VBatt 510 Ω R1 47 µF/ 16 V C2 R2 C1 20 kΩ 8 7 6 5 3 4 U6046B 1 2 4.7 µF 12 U6046B 4674B–AUTO–09/05 U6046B Figure 7-3. Monostable Delay Time, td, can be Activated by the ON Push-button, not Externally Deactivatable VBatt 510 Ω R1 C2 C1 47 µF/ 16 V R2 7 8 6 5 3 4 U6046B 1 Figure 7-4. 2 Increasing the Contact Current by Parallel Resistors VBatt 2 mA 5.6 kΩ 8 7 6 5.6 kΩ 5 20 kΩ 20 kΩ U6046B 1 2 3 4 13 4674B–AUTO–09/05 8. Ordering Information Extended Type Number Package U6046B-MY Remarks DIP8 Pb-free U6046B-MFPY SO8 Tubed, Pb-free U6046B-MFPG3Y SO8 Taped and reeled, Pb-free 9. Package Information P a c k a g e D IP 8 D im e n s io n s in m m 7 .7 7 7 .4 7 9 .8 9 .5 1 .6 4 1 .4 4 4 .8 m a x 6 .4 m a x 0 .5 m in 0 .5 8 0 .4 8 3 .3 0 .3 6 m a x 9 .8 8 .2 2 .5 4 7 .6 2 8 5 te c h n ic a l d ra w in g s a c c o rd in g to D IN s p e c ific a tio n s 1 14 4 U6046B 4674B–AUTO–09/05 U6046B 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 4 10. Revision History Please note that the following page numbers referred to in this section refer to the specific revision mentioned, not to this document. Revision No. History 4674B-AUTO-09/05 • • • • Put datasheet in a new template Pb-free Logo on page 1 added Heading Rows on Table “Absolute Maximum Ratings” on page 9 added Table “Ordering Information” on page 14 changed 15 4674B–AUTO–09/05 Atmel Corporation 2325 Orchard Parkway San Jose, CA 95131, USA Tel: 1(408) 441-0311 Fax: 1(408) 487-2600 Regional Headquarters 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 Tsimshatsui 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 Atmel Operations Memory 2325 Orchard Parkway San Jose, CA 95131, USA 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 Microcontrollers 2325 Orchard Parkway San Jose, CA 95131, USA 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 1150 East Cheyenne Mtn. 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