FOR AUTOMOTIVE 105

°C OPERATION 2-WIRE SERIAL E

S-24CS01A/02A/04A H Series

23

[ms]

Power supply voltage

[V]

50

5.0

4.0

3.0

2.0

100

150

200

For example:

If your E

to 5.0 V within 200 ms.

Figure 27 Raising Time of Power Supply Voltage

When initialization is successfully completed via the power-on-clear circuit, the S-24CS01A/02A/04A enters the standby

status.

If the power-on-clear circuit does not operate, the following are the possible causes.

(1) Because the S-24CS01A/02A/04A has not been initialized, an instruction formerly input is valid or an instruction

may be inappropriately recognized. In this case, writing may be performed.

(2) The voltage may have dropped due to power off while the S-24CS01A/02A/04A is being accessed. Even if the

microprocessor is reset due to the low power voltage, the S-24CS01A/02A/04A may malfunction unless the power-

on-clear operation conditions of S-24CS01A/02A/04A are satisfied. For the power-on-clear operation conditions of

S-24CS01A/02A/04A, refer to 5. 1 Raising power supply voltage.

If the power-on-clear circuit does not operate, match the phase (reset) so that the internal S-24CS01A/02A/04A circuit is

normally reset. The statuses of the S-24CS01A/02A/04A immediately after the power-on-clear circuit operates and

when phase is matched (reset) are the same.