S-24CM01C Datasheet, PDF (24/32 Pages) Seiko Instruments Inc – Write protect function during the low power supply voltage

2-WIRE SERIAL E²PROM
S-24CM01C
Rev.2.0_02_S
5.0
4.0
Power Supply Voltage (VCC)
[V]
3.0
2.0
50 100 150 200
Power Supply Voltage Rise Time (tRISE) max.
[ms]
For example: If the power supply voltage = 5.0 V, raise the power supply voltage to 5.0 V within 200 ms.
Figure 25 Power Supply Voltage Rise Time
When initialization is successfully completed by the power-on-clear circuit, the S-24CM01C enters the standby
status.
If the power-on-clear circuit does not operate;
The S-24CM01C has not completed initialization, an instruction previously input is still valid or an instruction may
be inappropriately recognized. In this case, S-24CM01C may perform the Write operation.
The voltage drops due to power off while the S-24CM01C is being accessed. Even if the master device is reset
due to the low power voltage, the S-24CM01C may malfunction unless the power-on-clear operation conditions of
S-24CM01C are satisfied.
When not keeping to the power supply voltage rise time seen in Figure 25, adjust the phase (reset) to reset the
internal circuit in the S-24CM01C normally.
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