S93A46A Datasheet, PDF (15/41 Pages) Seiko Instruments Inc – 125C OPERATION 3-WIRE SERIAL

Rev.6.1_00
125°C OPERATION 3-WIRE SERIAL E²PROM FOR AUTOMOTIVE
S-93A46A/56A/66A
4. 4 Writing to chip (WRAL)
To write the same 16-bit data to the entire memory address space, change CS to high, and then input the WRAL
instruction, an address, and 16-bit data following the start bit. Any address can be input. The write operation
starts when CS goes low. There is no need to set the data to 1 before writing. When the clocks more than the
specified number been input, the clock pulse monitoring circuit cancels the WRAL instruction. For details of the
clock pulse monitoring circuit, refer to “ Function to Protect Against Write due to Erroneous Instruction
Recognition”.
t_CDS
CS
Verify
Standby
SK
1 2 3 4 5 6 7 8 9 10
25
DI
<1> ^{0 0 0}
1
DO
High-Z
D15
4Xs
D0
t_SV
t_PR
busy
ready
t_HZ1
High-Z
Figure 12 Chip Write Timing (S-93A46A)
t_CDS
CS
Verify
Standby
SK
1 2 3 4 5 6 7 8 9 10 11 12
27
DI
<1> ^{0 0 0}
1
DO
High-Z
6Xs
D15
D0
t_SV
t_PR
busy
ready
t_HZ1
High-Z
Figure 13 Chip Write Timing (S-93A56A, S-93A66A)
Seiko Instruments Inc.
15