Low power consumption 60min timing circuit

(1) Introduction to the circuit principle is shown
in the circuit shown in Figure 3-24. TC9160 is a timer integrated
circuit with an on-chip oscillation circuit and a 20-bit binary
counter. The maximum timing time is
60min and the oscillation frequency is lkHz. The timing resistor
RT is more than 200kfl. According to bar ≤ 1/
(2. 2/Rt), if G is selected as 1800pF-, then
Rr is 216. 76kn, and
RPI is connected in series with R: in the circuit for adjustment. The output is an open-drain type, ()UT1~4 is divided
into 1/4 (15min) steps of 60min , and the vibration stops when the timer expires. At this time, the current consumption is only 1VA.     (2) Component parameter selection The selection of components is shown in Figure 3-24, and there are no special requirements. (3) The low-power 60min timing circuit is shown in Figure 3-24.