DS1683_12 Datasheet, PDF (13/21 Pages) Maxim Integrated Products – Total-Elapsed-Time and Event Recorder with Alarm

DS1683
Total-Elapsed-Time and Event Recorder with Alarm
REGISTERS 0Ah–0Dh: ETC REGISTER
Factory Default
Read Access
Write Access
Memory Type
00 00 00 00h
All
PW
Shadowed EEPROM, Nonvolatile
Memory
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
Access
0Ah
2⁷
2⁶
2⁵
2⁴
2³
2²
2¹
2⁰
0Bh
2¹⁵
2¹⁴
2¹³
2¹²
2¹¹
2¹⁰
2⁹
2⁸
0Ch
2²³
2²²
2²¹
2²⁰
2¹⁹
2¹⁸
2¹⁷
2¹⁶
0Dh
2³¹
2³⁰
2²⁹
2²⁸
2²⁷
2²⁶
2²⁵
2²⁴
BIT 7
BIT 0
The ETC register is a shadowed EEPROM register that contains the accumulated time in 250ms increments that the EVENT pin
has been held high. On power-up, on every rising edge of the EVENT pin, and after an I²C write to the ETC register, the value
from the shadowed EEPROM location is loaded into the ETC counter memory (SRAM). When the EVENT pin is high, it is this
SRAM memory that is incremented once every 250ms. On the falling edge of the EVENT pin, this value in SRAM memory is then
written to the shadowed EEPROM memory to store the accumulated time in 250ms increments.
REGISTERS 10h–11h: EVENT COUNTER ALARM LIMIT 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
10h
2⁷
2⁶
2⁵
2⁴
2³
2²
2¹
2⁰
11h
2¹⁵
2¹⁴
2¹³
2¹²
2¹¹
2¹⁰
2⁹
2⁸
BIT 7
BIT 0
The Event Counter Alarm Limit is a shadowed EEPROM register, and when the Event Counter register value equals or exceeds
the Event Counter Alarm Limit value, the EVENT flag bit (EVENT AF bit, Register 01h, bit 1) goes active high. When the Event
Counter register value drops below the Event Counter Alarm Limit value, the EVENT AF bit automatically clears.
Maxim Integrated
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