DS1683_12 Datasheet, PDF (12/21 Pages) Maxim Integrated Products – Total-Elapsed-Time and Event Recorder with Alarm

DS1683
Total-Elapsed-Time and Event Recorder with Alarm
REGISTERS 02h–05h: PASSWORD ENTRY (PWE)
Factory Default
Read Access
Write Access
Memory Type
FF FF FF FFh
N/A; Reads as all 0s
All
SRAM, Volatile
Memory
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
Access
02h
2⁷
2⁶
2⁵
2⁴
2³
2²
2¹
2⁰
03h
2¹⁵
2¹⁴
2¹³
2¹²
2¹¹
2¹⁰
2⁹
2⁸
04h
2²³
2²²
2²¹
2²⁰
2¹⁹
2¹⁸
2¹⁷
2¹⁶
05h
2³¹
2³⁰
2²⁹
2²⁸
2²⁷
2²⁶
2²⁵
2²⁴
BIT 7
BIT 0
There is one 4-byte password for the DS1683. Entering the correct password into the Password Entry (PWE) bytes allows write
access to the Event, ETC, Event Counter Alarm Limit, ETC Alarm Limit, Configuration, Password Value, and User Memory regis-
ters. This value is write-only, and reads from this location result in all 0s. On power-up, the PWE bits are set to 1 to match the fac-
tory default Password Value of all 1s.
REGISTERS 08h–09h: EVENT COUNTER REGISTER
Factory Default
Read Access
Write Access
Memory Type
00 00h
All
PW
Shadowed EEPROM, Nonvolatile
Memory
Access
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
08h
2⁷
2⁶
2⁵
2⁴
2³
2²
2¹
2⁰
09h
2¹⁵
2¹⁴
2¹³
2¹²
2¹¹
2¹⁰
2⁹
2⁸
BIT 7
BIT 0
The Event Counter register is a shadowed EEPROM register that contains the number of times a falling edge of the EVENT pin
has occurred. On power-up, on every rising edge of the EVENT pin, and after an I²C write to the Event Counter register, the value
from the shadowed EEPROM is loaded up into the Event Counter memory (SRAM). It is this memory that is incremented on the
falling edge of the EVENT pin. On the falling edge of the EVENT pin, this value in SRAM memory is then written to the shadowed
EEPROM memory to store the number of times there has been a falling edge on the EVENT pin.
Maxim Integrated
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