DS1683_12 Datasheet, PDF (15/21 Pages) Maxim Integrated Products – Total-Elapsed-Time and Event Recorder with Alarm

DS1683
Total-Elapsed-Time and Event Recorder with Alarm
REGISTERS 1Ah–1Dh: PASSWORD VALUE (PWV)
Factory Default
Read Access
Write Access
Memory Type
FF FF FF FFh
N/A; Reads as all 0s
PW
Shadowed EEPROM, Nonvolatile
Memory
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
Access
1Ah
2⁷
2⁶
2⁵
2⁴
2³
2²
2¹
2⁰
1Bh
2¹⁵
2¹⁴
2¹³
2¹²
2¹¹
2¹⁰
2⁹
2⁸
1Ch
2²³
2²²
2²¹
2²⁰
2¹⁹
2¹⁸
2¹⁷
2¹⁶
1Dh
2³¹
2³⁰
2²⁹
2²⁸
2²⁷
2²⁶
2²⁵
2²⁴
BIT 7
BIT 0
The default value for the four Password Value (PWV) is all 1s (FF FF FF FFh). The intent is to provide a manufacturer with a security
feature to protect the Configuration register, Alarm registers, User EEPROM, ETC and Event Counter registers, and the Password
Setting (PWV). The customer is not able to alter the Configuration register, Alarm registers, User EEPROM, ETC or Event Counter
registers, or Password Setting if the password conditions are not met.
REGISTERS 20h–2Fh: USER MEMORY
Factory Default
Read Access
Write Access
00h for All Locations
All
PW
Memory Type
EEPROM, Nonvolatile
There are 16 bytes of user-programmable EEPROM memory. User memory is set to read-only if the correct password is not
entered into the Password Entry bytes. If the correct password is entered into the Password Entry bytes, the data can be written
to the User Memory and stored in EEPROM with the correct I²C write command. The User Memory locations can be read regard-
less of the password protection.
Maxim Integrated
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