S24CS02A datasheet(24/47 Pages) SII

24 / 47 page

2-WIRE CMOS SERIAL E2PROM

S-24CS01A/02A/04A/08A

Rev.4.4_00

Seiko Instruments Inc.

Rise time (tRISE) Max.

[ms]

Power supply voltage

(VCC)

[V]

5.0

4.0

3.0

2.0

100 150

200

For example:

If your E

2PROM supply voltage = 5.0 V, raise the power supply

voltage to 5.0 V within 200 ms.

Figure 28 Raising Time of Power Supply Voltage

When initialization is successfully completed via the power-on-clear circuit, the E

2PROM enters the standby

status.

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

(1) Because the E

2PROM 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 E

2PROM is being accessed. Even if the

microprocessor is reset due to the low power voltage, the E

2PROM may malfunction unless the power-

on-clear operation conditions of E

2PROM are satisfied. For the power-on-clear operation conditions of

2PROM, 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 E

2PROM circuit is

normally reset. The statuses of the E

2PROM immediately after the power-on-clear circuit operates and

when phase is matched (reset) are the same.

S24CS02A Datasheet(PDF) 24 Page - Seiko Instruments Inc