U6046B_05 ATMEL | Alldatasheet

Document overview

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Technical content

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

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. The delay time can be interrupted manually, but a retrigger function is not provided. Figure 1-1. Block Diagram with External Circuit Stabilization Power-on reset Load-dump detection Debouncing Mono-flop Relay control output Oscillator Frequency divider ON OFF TOGGLE GND OSC VS Vstab 510 Ω 47 µF VBatt OUT Rear Window Heating Timer/ Long-term Timer U6046B Rev. 4674B–AUTO–09/05

4674B–AUTO–09/05 U6046B Pin Configuration Figure 2-1. Pinning GND OUT ON OFF TOGGLE OSC VSTAB VS Table 2-1. Pin Description Pin Symbol Function GND Reference point, ground OUT Relay control output ON Switch-on input OFF Switch-off input TOGGLE Toggle input OSC RC-oscillator input VSTAB Stabilized voltage VS Supply voltage

4674B–AUTO–09/05 U6046B 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 47 µF/ 16 V 510 Ω VBatt U6046B

4674B–AUTO–09/05 U6046B Figure 3-2. Basic Circuit for VS = 5V 3.2 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 inte- grated resistor is achieved with R2 >> 2 kΩ. Oscillator frequency, f, is calculated as follows: 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: Table 6-1 on page 10 shows relationships between t3, td, C2, R2 and frequencies from 1 Hz to 20 kHz. VS = 5 V U6046B VBatt f f--- td 73728 f---

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 interfer- ence 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 47 µF/ 16 V 510 Ω V Batt 20 kΩ U6046B

4674B–AUTO–09/05 U6046B 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 con- tacts 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 dis- abled 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 inter- rupted. 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 resis- tance (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: where VBatt =12V, VZ =7V I VBatt VZ R = 20 kΩ I 20 kΩ 0.25 mA

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 47 µF/ 16 V 510 Ω VBatt 20 kΩ 20 kΩ U6046B

4674B–AUTO–09/05 U6046B 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 V Ambient temperature range Tamb –40 to +125 Storage temperature range Tstg –55 to +125 Junction temperature Tj 150 Thermal Resistance Parameters Symbol Value Unit Junction ambient DIP8 SO8 RthJA RthJA 120 160 K/W K/W

Electrical Characteristics

VBatt =13.5V, Tamb = 25°C, reference point ground, Figure 2-1 on page 2, unless otherwise specified No. Parameters Test Conditions Pin Symbol Min. Typ. Max. Unit 1.1 Operating voltage R1 ≥510Ω t < 5 min t < 60 min VBatt V 1.2 5V supply Without R1, C1, Figure 3-2 on page 4 7, 8 V8, V7 4.3 6.0 V 1.3 Stabilized voltage VBatt = 12V 5.0 5.2 5.4 V 1.4 Undervoltage threshold Power on reset 3.0 4.2 V 1.5 Supply current All push buttons open 1.3 2.0 mA 1.6 Internal Z-diode I8 = 10 mA 13.5 V Relay Control Output, Pin 2 2.1 Saturation voltage I2 = 200 mA I2 = 300 mA 1.2 1.5 V 2.2 Leakage current V2 = 14V 100 µA 2.3 Output current 300 mA Output Pulse Current 3.1 Load dump pulse t ≤300 ms 1.5 A 3.2 Internal Z-diode I2 = 10 mA V Oscillator Input f = 0.001 to 40 kHz, See Table 6-1 on page 10, Pin 6 4.1 Internal discharge resistance V6 = 5V 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 µA

4674B–AUTO–09/05 U6046B Switching Time 5.1 Debounce time cycles 5.2 Delay time td 72704 74752 cycles Inputs ON, OFF, TOGGLE; Pins 3, 4, 5 6.1 Switching threshold voltage V3,4,5 1.6 2.0 2.4 V 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 kΩ Electrical Characteristics (Continued) VBatt =13.5V, Tamb = 25°C, reference point ground, Figure 2-1 on page 2, unless otherwise specified No. Parameters Test Conditions Pin Symbol Min. Typ. Max. Unit Table 6-1. Dimensioning for Oscillator Frequency, Debounce Time and Delay Time Frequency f Debounce Time t3 Delay Time td Hz ms min s nF kΩ 6000 1229 4700 280 3000 614 1000 650 2000 410 1000 440 1500 307 1000 330 1200 246 1000 260 1000 205 1000 220 857 176 1000 190 750 154 1000 160 667 137 1000 140 600 123 1000 130 300 100 650 200 100 440 150 100 330 120 100 260 100 100 220 100 190 100 160 100 140 100 100 130 200 369 600 300 246 400 400 184 300 500 147 240 600 123 200 700 9.00 105 170 800 8.00 150 900 7.00 130 1000 6.00 120

4674B–AUTO–09/05 U6046B 2000 3.00 600 3000 2.00 400 4000 1.50 300 5000 1.20 240 6000 1.00 200 7000 0.86 170 8000 0.75 150 9000 0.67 130 10000 0.60 120 11000 0.55 6.7 110 12000 0.50 6.1 13000 0.46 5.7 14000 0.43 5.3 15000 0.40 4.9 16000 0.38 4.6 17000 0.35 4.3 18000 0.33 4.1 19000 0.32 3.9 20000 0.30 3.7 Table 6-1. Dimensioning for Oscillator Frequency, Debounce Time and Delay Time (Continued) Frequency f Debounce Time t3 Delay Time td Hz ms min s nF kΩ

4674B–AUTO–09/05 U6046B

Package Information

Ordering Information

Tubed, Pb-free U6046B-MFPG3Y SO8 Taped and reeled, Pb-free 9 .8 9 .5 P a c ka g e D IP 8 D im e n s io n s in m m 1 .6 4 1 .4 4 4 .8 m a x 0 .5 m in 3 .3 0 .5 8 0 .4 8 7 .6 2 2 .5 4 6 .4 m a x 0 .3 6 m a x 9 .8 8 .2 7 .7 7 7 .4 7 te c h n ic a l d ra w in g s a c co rd in g to D IN s p e c ifica tio n s

4674B–AUTO–09/05 U6046B 10. Revision History technical drawings according to DIN specifications Dimensions in mm 5.00 4.85 0.4 1.27 3.81 1.4 0.25 0.10 5.2 4.8 3.7 3.8 6.15 5.85 0.2 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

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