U6046B/ U6047B Rear Window Heating Timer/ Long-Term Timer Description The bipolar long-term timers U6046B and U4047B are designed to limit the operation time of high loads in the harsh automotive enviroment automatically by 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. Features Delay time range: 3.7 s to 20 h Load-dump protection RC oscillator determines timing characteristics RF interference protected Relay driver with Z-diode Protection according to ISO/TR7637-1 (VDE 0839) Debounced input for toggle switch U6046B: Inputs switched to VBatt Two debounced inputs: ON and OFF U6047B: Inputs switched to ground Block Diagram C2 OSC 47 F R2 Vstab 7 6 VS C1 R1 510 8 Stabilization Power-on reset Load-dump detection Oscillator VBatt 1 GND Frequency divider 3 ON 4 OFF Debouncing Monoflop Relay control output 2 OUT 5 TOGGLE 94 8747 Figure 1. Block diagram with external circuit Ordering Information Extended Type Number Package U6046B, U6047B DIP8 U6046B-FP, U6047B-FP SO8 Rev. A4, 11-Apr-01 Remarks 1 (11) U6046B/ U6047B Pin Description Pin Symbol 1 GND Reference point, ground 2 OUT Relay control output 3 ON Switch-on input 4 OFF Switch-off input 5 Function GND 1 8 VS OUT 2 7 Vstab ON 3 6 OSC OFF 4 5 TOGGLE TOGGLE Toggle input 6 OSC RC oscillator input 7 Vstab Stabilized voltage 8 VS Supply voltage 94 8844 Figure 2. Pinning 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 , C1 = 47 F. VBatt 510 R1 C2 VS = 5 V R2 8 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. C2 C1 47 F/ 16 V The integrated Z-diode (14 V) protects the supply voltage,V S. Therefore, the operation of the IC is possible between 6 V and 16 V, supplied by VBatt. 7 6 5 VBatt R2 8 7 2 3 4 1 2 3 Figure 3. Basic circuit for 12 V supply and oscillator 4 94 8750 94 8749 2 (11) 5 U6046B U6047B U6046B U6047B 1 6 Figure 4. Basic circuit for VS = 5 V Rev. A4, 11-Apr-01 U6046B/ U6047B Oscillator, Pin 6 Relay Control Output (OUT) The external components R2 and C2 determine the oscilator frequency. The capacitor C2 is charged by R2 and discharged by an integrated 2-k resistor. The relay control output is an open-collector Darlington circuit with an integrated 23-V Z-diode for limitation of 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 @ 200 mA. A stable oscillator frequency with minimal influence of the temperature coefficient of the integrated resistor is achieved with R2 2 k Oscillator frequency, f, is calculated as follows: f 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 (refer to figures 10 and 11). 1 t1 t2 where t1 = charge time = 1R2C2 t2 = discharge time = 22 kC2 1 and 2 are constants as such 1 = 0.833 and 2 = 1.551 when C2 = 470 pF to 10 nF 1 = 0.746 and 2 = 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: t3 6 1 f The relay control output is protected via the integrated 23-V Z-diode in the case of short interference peaks. It is switched to conductive condition for a battery voltage of greater than approx. 40 V in the case of 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. t d 73728 1 f Table 1 shows relationships between t3, td, C2, R2 and frequencies from 1 Hz to 20 kHz. VBatt VBatt 510 R1 S1 C2 C1 7 R2 20 k 6 47 F/ 16 V 5 8 2 7 2 k 6 5 3 4 U6047B U6046B 1 S1 C2 C1 R2 47 F/ 16 V 8 510 R1 3 1 4 2 94 8752 94 8751 Figure 5. TOGGLE function U6046B Rev. A4, 11-Apr-01 Figure 6. TOGGLE function U6047B 3 (11) U6046B/ U6047B 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, Figures 5 and 6 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. 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, Figures 7 and 8 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 10 shows the input circuit of U6046B. It has an integrated pull-down resistance (20 k), 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 k and the push-button switch, S, is connected to the battery as shown in the diagram. Contact current, I, is calculated as follows: To avoid simultaneous operation of both inputs, Pin 3 (ON) and Pin 4 (OFF), use of two-way contact with centre-off position with spring returns (also known as rocker-actuated switch) is recommended. Pressing the push-button switch (Pin 3-ON) leads to the activation of the relay after the debounce time, t3, V -V I ( Batt Z ) where VBatt 12 V, V Z 7 V R 20 k I (12-7) V 0.25 mA 20 k It can be increased by connecting a 5.6 k resistor from the push-button switch to ground as shown in figure 15. VBatt S3 VBatt R1 510 C2 C1 R2 47 F/ 16 V 8 7 20 k 6 510 R1 C2 C1 20 k 47 F/ 16 V R2 8 6 7 5 5 U6047B U6046B 1 1 2 3 4 3 2 4 2 k 2 k 94 8753 S3 94 8754 Figure 7. ON/OFF function U6046B 4 (11) Figure 8. ON/OFF function U6047B Rev. A4, 11-Apr-01 U6046B/ U6047B Figure 11 shows the input circuit of U6047B. It has an integrated pull-up resistance (100 k), RF capacitor (15 pF) and Z-diode (7 V). The circuit reacts to voltages less than 2 V. The external protective resistance has a value of 2 k and the push-button switch is connected to GND. Contact current, I, is calculated as follows: VS I( when V Batt 12 V 100 k 2 k) It can be increased by connecting a 5.6 k resistor from the push-button-switch to VBatt as shown in figure 15. The diodes prevent the IC from a current flow into the input stage when the rocker switch is open. I 0.1 mA Timing Waveform Diagram 5A Pin 5 Toggle t3 Relay Pin 2 t3 t3 t3 t3 t3 t3 td Diagram 5B ON Pin 3 t3 OFF 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 94 8755 Figure 9. Behavior of the relay control output as a function of input condition VS 2V VBatt S R Pin 3,4,5 - + 100 k 20 k Pin 3,4,5 2V - + 20 k 7V 15 pF 2 k 94 8756 7V 15 pF 94 8757 Figure 10. Input circuit U6046B Rev. A4, 11-Apr-01 Figure 11. Input circuit U6047B 5 (11) U6046B/ U6047B Absolute Maximum Ratings Parameters Operating voltage, static, 5 min Symbol VBatt Value 24 Unit V Ambient temperature range Tamb -40 to +125 C Storage temperature range Tstg -55 to +125 C Tj 150 C Symbol RthJA RthJA Maximum 120 160 Unit K/W K/W Junction temperature Thermal Resistance Parameters Junction ambient DIP8 SO8 Electrical Characteristics VBatt =13.5 V, Tamb = 25C, reference point ground, figure 2, unless otherwise specified Parameters Operating voltage Stabilized voltage Test Conditions / Pin R1 510 t < 5 min t < 60 min Without R1, C1 figure 4 Pins 7 and 8 VBatt = 12 V Pin 7 Undervoltage threshold Power on reset V8 Supply current All push buttons open, Pin 8 I8 = 10 mA Pin 8 I8 5 V supply Internal Z-diode Relay control output Saturation voltage Leakage current Symbol VBatt Min 6 V8, V7 4.3 V7 5.0 3.0 V8 13.5 Typ Max 16 24 18 6.0 Unit 5.4 V 4.2 V 1.3 2.0 mA 14 16 V 5.2 V V Pin 2 I2 = 200 mA I2 = 300 mA V2 = 14 V Output current V2 1.2 V 1.5 100 A I2 300 mA 1.5 A I2 2 Output pulse current Load dump pulse t 300 ms I2 Internal Z-diode I2 = 10 mA V2 Oscillator input f = 0.001 to 40 kHz, see table 1 Internal discharge resistance Switching voltage V6 = 5 V Lower Upper V6 = 0 V 20 22 24 V R6 1.6 2.0 2.4 k V6L V6H -I6 0.9 2.8 1.1 3.1 1.4 3.5 1 V A Debounce time t3 5 7 cycles Delay time td 72704 74752 cycles Input current Pin 6 Switching times 6 (11) Rev. A4, 11-Apr-01 U6046B/ U6047B Electrical Characteristics VBatt =13.5 V, Tamb = 25C, reference point ground, figure 2, unless otherwise specified Parameters Inputs ON, OFF, TOGGLE Test Conditions / Pin Pins 3, 4 and 5 Switching threshold voltage Symbol Min Typ Max Unit V3,4,5 1.6 2.0 2.4 V V3,4,5 6.5 7.1 8.0 V Internal Z-diode I3, 4, 5 = 10 mA Pull-down resistance V3,4,5 = 5 V U 6046 B R3,4,5 13 20 50 k Pull-up resistance V3,4,5 = 0 V U 6047 B R3,4,5 70 100 140 k Table 1 Dimensioning for oscillator frequency, debounce time and delay time. Frequency f Debounce Time t3 Delay Time C2 R2 Frequency f td Delay Time C2 R2 td Hz ms min nF k Hz ms s nF k 1 6000 1229 4700 280 700 9.00 105 10 170 2 3000 614 1000 650 800 8.00 92 10 150 3 2000 410 1000 440 900 7.00 82 10 130 4 1500 307 1000 330 1000 6.00 74 10 120 5 1200 246 1000 260 2000 3.00 37 1 600 6 1000 205 1000 220 3000 2.00 25 1 400 7 857 176 1000 190 4000 1.50 18 1 300 8 750 154 1000 160 5000 1.20 15 1 240 9 667 137 1000 140 6000 1.00 12 1 200 10 600 123 1000 130 7000 0.86 11 1 170 20 300 61 100 650 8000 0.75 9 1 150 30 200 41 100 440 9000 0.67 8 1 130 40 150 31 100 330 10000 0.60 7 1 120 50 120 25 100 260 11000 0.55 6.7 1 110 60 100 20 100 220 12000 0.50 6.1 1 99 70 86 18 100 190 13000 0.46 5.7 1 91 80 75 15 100 160 14000 0.43 5.3 1 85 90 67 14 100 140 15000 0.40 4.9 1 79 100 60 12 100 130 16000 0.38 4.6 1 74 200 30 369 10 600 17000 0.35 4.3 1 70 300 20 246 10 400 18000 0.33 4.1 1 66 400 15 184 10 300 19000 0.32 3.9 1 62 500 12 147 10 240 20000 0.30 3.7 1 59 600 10 123 10 200 Rev. A4, 11-Apr-01 s Debounce Time t3 min 7 (11) U6046B/ U6047B Applications VBatt VBatt C2 510 R1 C1 C1 47 F/ 16 V 47 F/ 16 V 6 7 8 510 R1 R2 5 R2 7 8 2 6 5 3 4 U6047B U6046B 1 C2 1 4 3 2 94 8759 94 8758 Figure 12. Generation of a monostable delay time, td, caused by applying the operating voltage VBatt, not externally deactivatable. VBatt 510 R1 VBatt C2 510 R1 C1 20 k 8 R2 R2 C1 47 F/ 16 V C2 7 6 47 F/ 16 V 8 7 6 5 3 4 5 U6047B U6046B 1 1 2 2 4 3 4.7 F 22 F 2 k 94 8760 94 8761 Figure 13. Generation of a monostable delay time, td, by applying the operating voltage VBatt, deactivatable by the OFF push-button 8 (11) Rev. A4, 11-Apr-01 U6046B/ U6047B VBatt R1 VBatt 47 F/ 16 V R2 6 7 8 R2 C2 C1 47 F/ 16 V C2 C1 510 R1 510 7 8 6 5 3 4 5 U6047B U6046B 1 1 3 2 2 4 2 k 94 8762 94 8763 Figure 14. Monostable delay time, td, can be activated by the ON push-button, not externally deactivatable VBatt VBatt 2 mA 5.6 k 8 7 6 5.6 k 8 6 7 2x 5.6 k U6047B 5 20 k U6046B 20 k 1 3 2 2 k 1 2 3 5 4 2 k 4 94 8764 94 8765 Figure 15. Increasing the contact current by parallel resistors Rev. A4, 11-Apr-01 9 (11) U6046B/ U6047B 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 0.58 0.48 3.3 0.36 max 9.8 8.2 2.54 7.62 8 5 technical drawings according to DIN specifications 13021 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 13034 1 10 (11) 4 Rev. A4, 11-Apr-01 U6046B/ U6047B Ozone Depleting Substances Policy Statement It is the policy of Atmel Germany GmbH to 1. Meet all present and future national and international statutory requirements. 2. Regularly and continuously improve the performance of our products, processes, distribution and operating systems with respect to their impact on the health and safety of our employees and the public, as well as their impact on the environment. It is particular concern to control or eliminate releases of those substances into the atmosphere which are known as ozone depleting substances (ODSs). The Montreal Protocol (1987) and its London Amendments (1990) intend to severely restrict the use of ODSs and forbid their use within the next ten years. Various national and international initiatives are pressing for an earlier ban on these substances. Atmel Germany GmbH has been able to use its policy of continuous improvements to eliminate the use of ODSs listed in the following documents. 1. Annex A, B and list of transitional substances of the Montreal Protocol and the London Amendments respectively 2. Class I and II ozone depleting substances in the Clean Air Act Amendments of 1990 by the Environmental Protection Agency (EPA) in the USA 3. Council Decision 88/540/EEC and 91/690/EEC Annex A, B and C (transitional substances) respectively. Atmel Germany GmbH can certify that our semiconductors are not manufactured with ozone depleting substances and do not contain such substances. We reserve the right to make changes to improve technical design and may do so without further notice. Parameters can vary in different applications. All operating parameters must be validated for each customer application by the customer. Should the buyer use Atmel Wireless & Microcontrollers products for any unintended or unauthorized application, the buyer shall indemnify Atmel Wireless & Microcontrollers against all claims, costs, damages, and expenses, arising out of, directly or indirectly, any claim of personal damage, injury or death associated with such unintended or unauthorized use. Data sheets can also be retrieved from the Internet: http://www.atmel-wm.com Atmel Germany GmbH, P.O.B. 3535, D-74025 Heilbronn, Germany Telephone: 49 (0)7131 67 2594, Fax number: 49 (0)7131 67 2423 Rev. A4, 11-Apr-01 11 (11)