DS1344E-3+ Maxim Integrated Products, DS1344E-3+ Datasheet - Page 12

• Manufacturer Part Number: DS1344E-3+
• Description: Real Time Clock SPI RTC 20P TSSOP 3V 12.5PF ALRM
• Manufacturer: Maxim Integrated Products

Note: Bits listed as 0 always read back as 0 and cannot be written to 1.
Low-Current SPI/3-Wire RTCs
Table 1. Register Map
Table 2. Alarm Mask Bits
12
ADDRESS
12h–1Fh
20h–7Fh
A_M4
0Ah
0Bh
0Ch
0Dh
0Eh
00h
01h
02h
03h
04h
05h
06h
07h
08h
09h
0Fh
10h
11h
1
1
1
1
0
ALARM REGISTER MASK BITS (BIT 7)
Century
EOSC
A0M1
A0M2
A0M3
A0M4
A1M1
A1M2
A1M3
A1M4
BIT 7
TCS3
MSB
OSF
0
0
0
0
0
A_M3
1
1
1
0
0
BIT 6
12/24
12/24
12/24
TCS2
X
0
0
0
0
0
0
10 Year
A_M2
10 Seconds
10 Seconds
10 Seconds
1
1
0
0
0
10 Minutes
10 Minutes
10 Minutes
AM/PM
AM/PM
AM/PM
Hours
Hours
Hours
DOSF
BIT 5
TCS1
20
20
20
0
0
0
0
0
10 Date
A_M1
Month
EGFIL
Hours
Hours
Hours
BIT 4
TCS0
1
0
0
0
0
10
10
10
10
0
0
0
0
User RAM
Reserved
Alarm once a second
Alarm when seconds match
Alarm when minutes and seconds match
Alarm when hours, minutes, and seconds match
Alarm when day, hours, minutes, and seconds match
BIT 3
SQW
DS1
0
0
INTCN
BIT 2
DS0
Seconds
Seconds
Seconds
0
Minutes
Minutes
Minutes
Month
Hour
Date
Year
Hour
Hour
Day
Day
IRQF1
BIT 1
Day
A1IE
RS1
ALARM RATE
IRQF0
BIT 0
A0IE
LSB
RS0
Alarm 0 Hours
Alarm 1 Hours
Alarm 0 Day
Alarm 1 Day
FUNCTION
User RAM
Reserved
Seconds
Seconds
Seconds
Charger
Minutes
Century
Alarm 0
Alarm 0
Minutes
Alarm 1
Alarm 1
Minutes
Control
Month/
Trickle
Status
Hours
Date
Year
Day
00h–FFh
RANGE
01–12 +
Century
AM/PM
AM/PM
AM/PM
1–12 +
1–12 +
1–12 +
00–59
00–59
00–23
01–31
00–99
00–59
00–59
00–23
00–59
00–59
00–23
1–7
1–7
1–7
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—
—
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