BQ32002 Datasheet, PDF (12/29 Pages) Texas Instruments – BQ32002 Real-Time Clock (RTC)

BQ32002
SLUSA96B – AUGUST 2010 – REVISED APRIL 2016
7.6 Register Maps
REGISTER
0
1
2
3
4
5
6
7
9
ADDRESS
(HEX)
0x00
0x01
0x02
0x03
0x04
0x05
0x06
0x07
0x09
Table 2. Normal Registers
REGISTER NAME
SECONDS
MINUTES
CENT_HOURS
DAY
DATE
MONTH
YEARS
CAL_CFG1
CFG2
DESCRIPTION
Clock seconds and STOP bit
Clock minutes
Clock hours, century, and CENT_EN bit
Clock day
Clock date
Clock month
Clock years
Calibration and configuration
Configuration 2
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REGISTER
32
33
34
ADDRESS
(HEX)
0x20
0x21
0x22
Table 3. Special Function Registers
REGISTER NAME
SF KEY 1
SF KEY 2
SFR
DESCRIPTION
Special function key 1
Special function key 2
Special function register
7.6.1 I²C Read After Backup Mode
The time-keeping registers can take up to 1 second to update after the RTC switches from backup power supply
to main power supply. An I²C read of the RTC that starts before the update has completed will return the time
when the RTC enters backup mode. To ensure that the correct time is read after backup mode, the host should
wait longer than 1 second after the main supply is greater than 2.8 V and V_BACK.
12
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