FOR AUTOMOTIVE 125°C OPERATION WITH INTERRUPT TIME SETTING PIN CONVENIENCE TIMER

S-35720 Series

Seiko Instruments Inc.

12

2. When power supply voltage is raised at RST

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pin = "H"

Set the RST

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pin to "L" after the power supply voltage reaches 1.8 V or higher. If the RST

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pin is set to "L" for 500 ms

or longer, the oscillation start signal becomes "H", and the oscillation circuit normally oscillates. After that, if the RST

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pin is set to "H", the oscillation start signal becomes "L" within 500 ms, and the oscillation status is maintained.

The current consumption increases as mentioned below while the RST

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pin is set to "L".

• When the product without a pull-up resistor is selected:

1.7

μA typ.

• When the product with a pull-up resistor is selected:

30

μA typ.

10 ms

1.8 V

0.2 V or lower

RST pin input

Oscillation start signal

Oscillation circuit output

(Operation power supply voltage min.)

Oscillation start signal

within 500 ms

*1. 0 V means that there is no potential difference between the VDD pin and the VSS pin of the S-35720 Series.

Figure 14 When Power Supply Voltage is Raised at RST

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Pin = "H"