The low-voltage 60min timing circuit

Published:2011/6/19 22:41:00 Author:qqtang | Keyword: low-voltage, timing circuit | From:SeekIC

In the circuit, TC9l60 is the timer integrated circuit, in the chip there is an oscillating circuit and 20-bit binary counter, the maximum timing is 60min, the oscillating frequency is 1KHz. The timer resistance RT is higher than 20OkΩ. According to C2≤1/(2．2fcRt), if C2 is 1800pF, then Rt＝216.76kΩ, which is serially connected with R2. The output is the leakage pole open type, OUT1～4 is graded every 15min, and it stops when the timing is over, by this moment, the power consumption is only 1μA.



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