S-24CS01A Datasheet, PDF (19/47 Pages) Seiko Instruments Inc – 2-WIRE CMOS SERIAL E2PROM

Rev.4.4_00
2-WIRE CMOS SERIAL E²PROM
S-24CS01A/02A/04A/08A
8. Address Increment Timing
The timing for the automatic address increment is the falling edge of the SCL clock for the 8th bit of the
read data in read operation and the falling edge of the SCL clock for the 8th bit of the received data in write
operation.
SCL
8
9
1
8
9
SDA
R / W=1
ACK Output
D7 Output
D0 Output
Address Increment
Figure 19 Address Increment Timing in Reading
SCL
8
9
1
8
9
SDA
R / W=0
ACK Output D7 Input
D0 Input
ACK Output
Address Increment
Figure 20 Address Increment Timing in Writing
„ Write Inhibition Function at Low Power Voltage
The S-24CS01A/02A/04A/08A have a detection circuit for low power voltage. The detection circuit cancels
a write instruction when the power voltage is low or the power switch is on. The detection voltage is 1.75 V
typically and the release voltage is 2.05 V typically, the hysteresis of approximate 0.3 V thus exists. (See
Figure 21.)
When a low power voltage is detected, a write instruction is canceled at the reception of a stop condition.
When the power voltage lowers during a data transmission or a write operation, the data at the address of
the operation is not assured.
Power supply voltage
Hysteresis width
0.3 V approximately
Detection voltage (-V_DET)
1.75 V typ.
Release voltage (+V_DET)
2.05 V typ.
Write Instruction
cancel
Figure 21 Operation at low power voltage
Seiko Instruments Inc.
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