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U6046B_05 Datasheet, PDF (1/16 Pages) ATMEL Corporation – REAR WINDOW HEATING TIMER / LONG-TERM TIMER
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
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.
The delay time can be interrupted manually, but a retrigger function is not provided.
Figure 1-1. Block Diagram with External Circuit
Rear Window
Heating Timer/
Long-term
Timer
U6046B
C2
OSC 6
R2
47 µF
C1 R1
Vstab 7
VS 8
510 Ω
VBatt
Oscillator
Stabilization
Power-on reset
Load-dump detection
1
GND
3
ON
4
OFF
5
TOGGLE
Frequency divider
Debouncing
Mono-flop
Relay control
output
2
OUT
Rev. 4674B–AUTO–09/05