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90-0092 Datasheet(PDF) 11 Page - Maxim Integrated Products

Part No. 90-0092
Description  I2C Serial Real-Time Clock
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Maker  MAXIM [Maxim Integrated Products]
Homepage  http://www.maxim-ic.com
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 11 page
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DS1339 I
2C Serial Real-Time Clock
11 of 20
ADDRESS MAP
Table 3 shows the address map for the DS1339 registers. During a multibyte access, when the address pointer
reaches the end of the register space (10h), it wraps around to location 00h. On an I
2C START, STOP, or address
pointer incrementing to location 00h, the current time is transferred to a second set of registers. The time
information is read from these secondary registers, while the clock may continue to run. This eliminates the need
to re-read the registers in case of an update of the main registers during a read.
Table 3. Timekeeper Registers
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
Hour
Hours
1–12
+AM/PM
00–23
20 Hour
03h
0
0
0
0
0
Day
Day
1–7
04h
0
0
10 Date
Date
Date
01–31
05h
Century
0
0
10
Month
Month
Month/
Century
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
Hour
Alarm 1
Hours
1–12 +
AM/PM
00–23
20 Hour
0Ah
A1M4
DY/DT
10 Date
Day, Date
Alarm 1
Day,
Alarm 1
Date
1-7, 1-31
0Bh
A2M2
10 Minutes
Minutes
Alarm 2
Minutes
00–59
0Ch
A2M3
12/
24
AM/PM
10 Hour
Hour
Alarm 2
Hours
1–12 +
AM/PM
00–23
20 Hour
0Dh
A2M4
DY/
DT
10 Date
Day, Date
Alarm 2
Day,
Alarm 2
Date
1–7, 1–31
0Eh
EOSC
0
BBSQI
RS2
RS1
INTCN
A2IE
A1IE
Control
β€”
0Fh
OSF
0
0
0
0
0
A2F
A1F
Status
β€”
10h
TCS3
TCS2
TCS1
TCS0
DS1
DS0
ROUT1
ROUT0
Trickle
Charger
β€”
Note: Unless otherwise specified, the state of the registers are not defined when power is first applied or when VCC and VBACKUP falls below the
VBACKUP(MIN).




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