S-7760A Datasheet, PDF (28/53 Pages) Seiko Instruments Inc – PROGRAMMABLE PORT CONTROLLER (PORT EXPANDER WITH BUILT-IN E2PROM CIRCUIT)

PROGRAMMABLE PORT CONTROLLER (PORT EXPANDER WITH BUILT-IN E²PROM CIRCUIT)
S-7760A
Rev.1.3_00
„ Write Protect Function during the Low Power Supply Voltage
The S-7760A has a built-in detection circuit which operates with the low power supply voltage, cancels Write when the
power supply voltage drops and power-on. Its detection voltage is 1.75 V (Typ.) and the release voltage is 2.05 V (Typ.),
and its hysteresis is approx. 0.3 V.
The S-7760A cancels Write by detecting a low power supply voltage when it receives a stop condition.
Both in the data transmission and the Write operation, data in the address written during the low power supply voltage is
not assured.
Power supply voltage
Detection Voltage (−V_DET)
1.75 V Typ.
Hysteresis
approx. 0.3 V
Release voltage (+V_DET)
2.05 V Typ.
Cancel the Write instruction
Figure 31 Operation during Low Power Voltage
28
Seiko Instruments Inc.