Datasheet

DS1683
Total-Elapsed-Time and Event Recorder with Alarm
15Maxim Integrated
REGISTERS 1Ah–1Dh: PASSWORD VALUE (PWV)
REGISTERS 20h–2Fh: USER MEMORY
Factory Default FF FF FF FFh
Read Access N/A; Reads as all 0s
Write Access PW
Memory Type Shadowed EEPROM, Nonvolatile
Memory
Access
R/W R/W R/W R/W R/W R/W R/W R/W
1Ah 2
7
2
6
2
5
2
4
2
3
2
2
2
1
2
0
1Bh 2
15
2
14
2
13
2
12
2
11
2
10
2
9
2
8
1Ch 2
23
2
22
2
21
2
20
2
19
2
18
2
17
2
16
1Dh 2
31
2
30
2
29
2
28
2
27
2
26
2
25
2
24
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.
Factory Default 00h for All Locations
Read Access All
Write Access 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 I
2
C write command. The User Memory locations can be read regard-
less of the password protection.