2-WIRE CMOS SERIAL E2PROM
S-24CS01A/02A/04A/08A
Rev.4.4_00
5.0
4.0
Power supply voltage
(VCC
[V]
)
3.0
2.0
50
100 150 200
Rise time (tRISE) Max.
[ms]
For example:
If your E2PROM 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 E2PROM enters the standby
status.
If the power-on-clear circuit does not operate, the following are the possible causes.
(1) Because the E2PROM 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 E2PROM is being accessed. Even if the
microprocessor is reset due to the low power voltage, the E2PROM may malfunction unless the power-
on-clear operation conditions of E2PROM are satisfied. For the power-on-clear operation conditions of
E2PROM, 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 E2PROM circuit is
normally reset. The statuses of the E2PROM immediately after the power-on-clear circuit operates and
when phase is matched (reset) are the same.
24
Seiko Instruments Inc.
SII [ SEIKO INSTRUMENTS INC ]
