Datasheet

Table 3. Timekeeping Register Map
“0” - reads as Logic 0.
Note: Unless otherwise specified, the state of the registers are not defined when power is first applied or when V
CC
and V
BACKUP
fall below the V
BACKUP(MIN)
.
ADDRESS BIT 7 BIT 6 BIT 5 BIT 4 BIT 3 BIT 2 BIT 1 BIT 0 FUNCTION RANGE
00h 0
10Seconds Seconds Seconds 00-59
01h 0
10Minutes Minutes Minutes 00-59
02h 0
12/24
AM/PM
10
Hour
Hours Hours
01-12
+AM/PM
00-23
20Hour
03h 0 0 0 0 0 Day Day 01-07
04h 0 0
10Date Date 01-31
05h Century 0 0
10
Month
Month Month
01-12
+Century
06h
10Year Year Year 00-99
07h A1M1
10Seconds Seconds
Alarm 1
Seconds
00-59
08h A1M2
10Minutes Minutes
Alarm 1
Minutes
00-59
09h A1M3
12/24
AM/PM
10
Hour
Hours
Alarm 1
Hours
01-12
+AM/PM
00-23
20Hour
0Ah A1M4
DY/DT
10Date Day, Date
Alarm 1
Day, Alarm
1 Date
01-07,
01-31
0Bh A2M2
10Minutes Minutes
Alarm 2
Minutes
00-59
0Ch A2M3
12/24
AM/PM
10
Hour
Hours
Alarm 2
Hours
01-12
+AM/PM
00-23
20Hour
0Dh A2M4
DY/DT
10Date Day, Date
Alarm 2
Day, Alarm
2 Date
01-07,
01-31
0Eh
EOSC
0 BBSQI RS2 RS1 INTCN A2IE A1IE Control -
0Fh OSF 0 0 0 0 0 A2F A1F Status -
10h TCS3 TCS2 TCS1 TCS0 DS1 DS0 ROUT1 ROUT0
Trickle
Charger
-
DS1339B Low-Current, I
2
C, Serial Real-Time Clock
For High-ESR Crystals
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