DS3231MZ MAXIM [Maxim Integrated Products], DS3231MZ Datasheet - Page 11

• Manufacturer Part Number: DS3231MZ
• Description: 5ppm, I2C Real-Time Clock Battery Backup for Continuous Timekeeping
• Manufacturer: MAXIM [Maxim Integrated Products]

Table 2. Timekeeping Registers
Note: Unless otherwise specified, the registers’ state is not defined when power is first applied.
The time and calendar information is obtained by read-
ing the appropriate register bytes. Table 2 shows the
RTC registers. The time and calendar data are set or
initialized by writing the appropriate register bytes. The
contents of the time and calendar registers are in the
binary-coded decimal (BCD) format. The device can
ADDRESS
0Ah
0Bh
0Ch
0Dh
0Eh
00h
01h
02h
03h
04h
05h
06h
07h
08h
09h
0Fh
10h
11h
12h
Century
EOSC
A1M1
A1M2
A1M3
A1M4
A2M2
A2M3
A2M4
DATA
BIT 7
SIGN
SIGN
MSB
OSF
0
0
0
0
0
BBSQW
DY/DT
DY/DT
DATA
DATA
DATA
BIT 6
12/24
12/24
12/24
0
0
0
0
10 Year
Clock and Calendar
10 Seconds
10 Seconds
10 Minutes
10 Minutes
10 Minutes
AM/PM
AM/PM
AM/PM
CONV
Hours
Hours
Hours
DATA
DATA
BIT 5
20
20
20
0
0
0
0
10 Date
10 Date
10 Date
Month
Hours
Hours
Hours
DATA
DATA
BIT 4
NA
10
10
10
10
0
0
0
±5ppm, I
EN32KHZ
DATA
DATA
BIT 3
NA
0
0
be run in either 12-hour or 24-hour mode. Bit 6 of the
Hours register is defined as the 12-hour or 24-hour mode
select bit. When high, the 12-hour mode is selected. In
the 12-hour mode, bit 5 is the AM/PM bit with logic-high
being PM. In the 24-hour mode, bit 5 is the 20-hour bit
(20–23 hours). The century bit (bit 7 of the Month regis-
ter) is toggled when the Years register overflows from 99
INTCN
DATA
DATA
BIT 2
BSY
Seconds
Seconds
0
Minutes
Minutes
Minutes
Month
2
Hour
Hour
Hour
Date
Year
Date
Date
Day
Day
C Real-Time Clock
DATA
DATA
BIT 1
A2IE
Day
A2F
0
DATA
DATA
BIT 0
A1IE
LSB
A1F
0
Month/Century
Alarm 1 Hours
Alarm 2 Hours
Alarm 1 Date
Alarm 2 Date
Temperature
Temperature
Alarm 1 Day
Alarm 2 Day
Aging Offset
FUNCTION
Seconds
Seconds
Minutes
Alarm 1
Alarm 1
Minutes
Alarm 2
Minutes
Control
Status
Hours
Date
Year
MSB
Day
LSB
01–12 +
RANGE
Century
1–12 +
AM/PM
1–12 +
AM/PM
1–12 +
AM/PM
00–59
00–59
00–23
01–31
00–99
00–59
00–59
00–23
00–59
00–23
1–31
1–31
1–7
1–7
1–7
—
—
—
—
—
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