X46402 Datasheet, PDF (14/23 Pages) Xicor Inc. – Dual Voltage CPU Supervisor with 64K Password Protected EEPROM

X46402
Figure 15. Non-Password Protected Random Read
No-Password
COMMAND
SDA _S
Preliminary Information
S
Data 0
S
Data 0
Figure 16. Non-Password Protected Sequential Read
No-Password
COMMAND
SDA _S
Data 0
S
Data X
Figure 17. Change Passwords
SDA _S
COMMAND
Old
Password
7
Old
Password
0
If ACK, then
Password Matches
ACK POLLING
COMMAND
S
Two bytes of “0”
Wait t_WC
OR
Repeated
ACK Polling
Command
New
Password
7
New
Password
0
New
Password
7
New
Password
0
Data ACK
Polling
If immediate ACK,
*^S
then New Password error
If immediate NACK,
followed by ACK after ~5ms
then New Password OK
* ACK for correct password, No ACK for incorrect password
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