S-7760A Datasheet, PDF (19/53 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
This IC goes in the status to reset the circuits when the power supply voltage decreases less than the level of the
detection voltage of the circuit for prevention malfunction by low voltage (1.75 V Typ.). And the DO7 to 0 pins go in “L”.
After that, when the power supply voltage increases more than the level of the release voltage of the circuit for prevention
malfunction by low voltage (2.05 V Typ.), data is reloaded from the E²PROM to the register, the values of DO7 to 0 pins go
back to its default.
1.75 V Typ.
Power supply voltage
V_CCH / V_CCL
Signal of low power
supply voltage
detection
TIMEN pin
2.05 V Typ.
Data loading
Oscillation circuit
EN
Exceeded the release voltage of
low supply voltage detection
(2.05 V); Timer action starts
SDA
Time out
Timer action starts by reloading
Time out
Start condition
Device code
ACK
Reload instruction
Stop condition
SCL
DO3 pin
(When E²PROM
CTR3 = 0)
CTR3 register
(When E²PROM
CTR3 = 0)
Delay time by timer setting with DO3
Reload starts
*1
Delay time by timer setting with DO3
Reload starts
DO2 pin
(When E²PROM
CTR2 = 1)
CTR2 register
(When E²PROM
CTR2 = 1)
Delay time by timer setting with DO2
Reload starts
*1
Delay time by timer setting with DO2
Reload starts
Period to define data^*2
Period to define data^*2
*1. Output from DO7 to 0 goes in “L” when the power supply voltage decreases more than the level of the detection
voltage of the circuit for prevention malfunction by low voltage.
*2. A period to define data is; the loading period from E²PROM + the period to stabilize output from DO7 to 0 pin = within
100 µs.
Figure 20 Data Loading and Timer Action Example 2
Seiko Instruments Inc.
19