DS1689SN+ Maxim Integrated, DS1689SN+ Datasheet - Page 23

• Manufacturer Part Number: DS1689SN+
• Description: Real Time Clock
• Manufacturer: Maxim Integrated
• Series: DS1689, DS1693r

Specifications of DS1689SN+

• Rohs: yes
• Function: Clock, Calendar, NV SRAM Control
• Rtc Bus Interface: Multiplexed
• Date Format: DW
• Time Format: HH
• Rtc Memory Size: 114 B
• Supply Voltage - Max: 5.5 V
• Supply Voltage - Min: 2.7 V
• Maximum Operating Temperature: + 85 C
• Minimum Operating Temperature: - 40 C
• Mounting Style: SMD/SMT
• Package / Case: SOIC-28

ELAPSED TIME COUNTERS
The DS1689/DS1693 has two 32-bit elapsed time counters, which reside in bank 1 of the RTC registers.
To access these counters the DV0 bit in register A must first be set to a logical 1.
The V
resides in register 54 and the MSB is in 57H. The V
V
of seconds that have elapsed. The counter can be read or written at the user’s discretion. The V
powered elapsed time counter resides in register 58H through 5BH. The LSB of this counter resides in
register 58 and the MSB is in 5BH.
The V
nominal limits regardless of the condition of V
in a binary counter and the counter can be read or written at the user’s discretion.
In a typical application, the V
that has elapsed from which the equipment that contains the device was first put into service. The V
powered counter can then be used to record the length of time that V
can be particularly useful for warranty and maintenance information. In addition, battery life can be
predicted based on known loading factors. However, it is worth noting that a properly selected battery
should power the DS1689/DS1693 and external RAM for the useful life of most equipment.
POWER-CYCLE COUNTER
The DS1689/DS1693 has a 16-bit power-cycle counter that resides in register 5C and 5D of bank 1. The
LSB of this counter resides in 5C and the MSB is in 5D. This binary counter is incremented by one count
each time V
discretion.
CCI
input is within nominal limits. The elapsed time counter is a binary counter that records the number
CC
BAT
powered elapsed time counter resides in register 54H through 57H. The LSB of this counter
powered elapsed time counter runs continually as long as the V
CCI
power is applied within nominal limits. This counter can be read or written at the user’s
BAT
-powered elapsed time counter can be used to record the length of time
CCI
. The number of seconds that have elapsed is recorded
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CC
powered elapsed time counter runs only while the
CC
power is applied. These functions
BAT
or V
BAUX
pin is within
BAT
CC
-