WAKE-UP TIMER IC

PIN-SELECTABLE WAKE-UP TIMER IC

S-35720 Series

11

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 crystal 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 by 30

μA typ. while the RST

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pin is set to "L".

10 ms

1.8 V

0.2 V or lower

RST pin input

Oscillation start signal

(Operation power supply voltage min.)

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

Figure 11 When Power Supply Voltage is Raised at RST

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Pin = "H"

The RST

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pin has a built-in chattering elimination circuit.

Regarding the chattering elimination of the RST

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pin, refer to " Chattering Elimination of RST

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Pin".