S-7760A Datasheet, PDF (31/53 Pages) Seiko Instruments Inc – PROGRAMMABLE PORT CONTROLLER (PORT EXPANDER WITH BUILT-IN E2PROM CIRCUIT)

PROGRAMMABLE PORT CONTROLLER (PORT EXPANDER WITH BUILT-IN E²PROM CIRCUIT)
Rev.1.3_00
S-7760A
5.0
4.0
Power supply voltage(VCCH)
[V]
3.0
2.0
50 100 150 200
Rise time (tRISE) Max.
For example:
[ms]
If your S-7760A’s supply voltage = 3.0 V, raise the power supply voltage to 3.0 V within 100 ms.
Figure 34 Raising Time of Power Supply Voltage
When initialization is successfully completed by the power-on-clear circuit, the S-7760A enters the standby status.
If the power-on-clear circuit does not operate, the followings are the possible causes.
(1) Because the S-7760A has not completed initialization, an instruction previously input is still valid or an
instruction may be inappropriately recognized. In this case, S-7760A may perform the Write operation.
(2) The voltage drops due to power off while the S-7760A is being accessed. Even if the master device is reset
due to the low power voltage, the S-7760A may malfunction unless the conditions for the power-on-clear
operation are satisfied.
Seiko Instruments Inc.
31