U6046B ATMEL | Alldatasheet
Document overview
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Technical content
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
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Figure 2. Pinning
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
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4674A–AUTO–01/03 Oscillator (Pin 6) The external components R 2 and C2 determine the oscillator frequency. The capacitor C2 is charged by R2 and discharged by an integrated 2-k/g87 resistor. A stable oscillator frequency with minimal influence of the temperature coefficient of the integrated resistor is achieved with R2 >> 2 k/g87. Oscillator frequency, f, is calculated as follows: where t1 = charge time = /g971 /g180/g32R2 /g180/g32C2 t2 = discharge time = /g972 /g180/g322 k/g87 /g180/g32C2 /g971 and /g972 are constants as such /g971 = 0.833 and /g972 = 1.551 when C2 = 470 pF to 10 nF /g971 = 0.746 and /g972 = 1.284 when C2 = 10 nF to 4700 nF The debounce time, t 3, and the delay time, t d, depend on the oscillator frequency, f, as follows: 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 R 1, 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 out- put is disabled. f 1 t3 6 1 f---/g180= td 73728 1 f---/g180=
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(20 k/g87), RF capacitor (15 pF) and Z-diode (7 V). It reacts to voltages greater than 2 V. connected to the battery as shown in the diagram. ground as shown in Figure 12. Figure 6. ON/OFF Function
Figure 8. Input Circuit U6046B
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4674A–AUTO–01/03
Electrical Characteristics
VBatt =13.5 V, Tamb = 25/g176C, reference point ground, Figure 2, unless otherwise specified No. Parameters Test Conditions Pin Symbol Min. Typ. Max. Unit
1.1 Operating voltage R 1 /g179510 /g87
t<5m i n t<6 0m i n VBatt 61 6 V 1.2 5 V supply Without R 1, C1, Figure 4 7, 8 V 8, V7 4.3 6.0 V 1.3 Stabilized voltage V Batt = 12 V 7 V 7 5.0 5.2 5.4 V 1.4 Undervoltage threshold Power on reset V 8 3.0 4.2 V 1.5 Supply current All push buttons open 8 I 8 1.3 2.0 mA 1.6 Internal Z-diode I 8 = 10 mA 8 V 8 13.5 14 16 V
2 Relay Control Output 2
2.1 Saturation voltage I 2 = 200 mA
I2 = 300 mA V2 1.2 1.5 V
2.2 Leakage current V 2 = 14 V I 2 21 0 0 µ A
2.3 Output current I 2 300 mA
3 Ouput Pulse Current
3.1 Load dump pulse t /g163 300 ms I 2 1.5 A
3.2 Internal Z-diode I 2 = 10 mA V 2 20 22 24 V
4 Oscillator Input f = 0.001 to 40 kHz, See Table 1 6
4.1 Internal discharge
V6 = 5 V R 6 1.6 2.0 2.4 k /g87
4.2 Switching voltage Lower
0.9 2.8 1.1 3.1 1.4 3.5 V
4.3 Input current V 6 = 0 V -I 6 1µ A
5 Switching Time
5.1 Debounce time t 3 5 7 cycles
5.2 Delay time t d 72704 74752 cycles
6 Inputs ON, OFF, TOGGLE 3, 4, 5
6.1 Switching threshold voltage V 3,4,5 1.6 2.0 2.4 V 6.2 Internal Z-diode I 3, 4, 5 = 10 mA V3,4,5 6.5 7.1 8.0 V
6.3 Pull-down resistance V 3,4,5 = 5 V R3,4,5 13 20 50 k/g87
Table 1. Dimensioning for Oscillator Frequency, Debounce Time and Delay Time
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4674A–AUTO–01/03
Applications
Figure 9. Generation of a Monostable Delay Time, td, Caused by Applying the Figure 10. Generation of a Monostable Delay Time, td, by Applying the Operating
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Package Information
Ordering Information
Extended Type Number Package Remarks U6046B DIP8 U6046B-FP SO8 9.8 9.5 Dimensions in mm 1.64 1.44 4.8 max 0.5 min 3.3 0.58 0.48 7.62 2.54 6.4 max 0.36 max 9.8 8.2 7.77 7.47 technical drawings according to DIN specifications 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
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