S93S46A Datasheet, PDF (16/25 Pages) Seiko Instruments Inc – 3-WIRE SERIAL E2PROM FOR AUTOMOTIVE

150°C OPERATION 3-WIRE SERIAL E²PROM FOR AUTOMOTIVE
S-93S46A/56A/66A
Rev.2.1_00
5. Write enable (EWEN) / write disable (EWDS)
The EWEN instruction is an instruction that enables a write operation. The status in which a write operation is enabled
is called the program enable mode.
The EWDS instruction is an instruction that disables a write operation. The status in which a write operation is
disabled is called the program disable mode.
After the CS pin goes to "H", input an instruction in the order of the start bit, EWEN or EWDS instruction, and address
(optional). Each mode becomes valid by inputting "L" to the CS pin after the last address (optional) has been input.
CS
Standby
SK
1
2
3
4
5
6
7
8
9
DI
<1> ⁰
0
11 = EWEN
4Xs
00 = EWDS
Figure 12 Write Enable / Disable Timing (S-93S46A)
CS
Standby
SK
1 2 3 4 5 6 7 8 9 10 11
DI
<1> ⁰
0
11 = EWEN
6Xs
00 = EWDS
Figure 13 Write Enable / Disable Timing (S-93S56A/66A)
Remark It is recommended to execute an EWDS instruction for preventing an incorrect write operation if a write
instruction is erroneously recognized when executing instructions other than write instruction, and
immediately after power-on and before power-off.
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Seiko Instruments Inc.