WAKE-UP TIMER IC

PROGRAMMABLE WAKE-UP TIMER IC

S-35710 Series

22

2. When power supply voltage is raised at RST

_______

pin = "H"

Set the RST

_______

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

_______

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

_______

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

_______

pin is set to "L".

• S-35710C01I (without pull-up resistor):

1.7

μA typ.

• S-35710B01I (with pull-up resistor):

30

μA typ.

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-35710 Series.

Figure 29 When Power Supply Voltage is Raised at RST

_______

Pin = "H"

The RST

_______

pin has a built-in chattering elimination circuit. To determine the RST

_______

pin "H" input, perform communication

subsequent to setting the interval of 3.5 periods (0.438 seconds) of clock (8 Hz) or longer after the RST

_______

pin changes

from "L" to "H".

Regarding the chattering elimination of the RST

_______

pin, refer to " RST

_______

Pin".