DS3234S# Maxim Integrated Products, DS3234S# Datasheet - Page 12

• Manufacturer Part Number: DS3234S#
• Description: IC RTC W/TCXO 20-SOIC
• Manufacturer: Maxim Integrated Products
• Type: Clock/Calendar/TCXO/Crystalr

Specifications of DS3234S#

• Memory Size: 2K (256 x 8)
• Time Format: HH:MM:SS (12/24 hr)
• Date Format: YY-MM-DD-dd
• Interface: SPI, 3-Wire Serial
• Voltage - Supply: 2 V ~ 5.5 V
• Operating Temperature: 0°C ~ 70°C
• Mounting Type: Surface Mount
• Package / Case: 20-SOIC (7.5mm Width)
• Function: Clock/Calendar/Alarm/Battery Backup/Interrupt
• Rtc Memory Size: 256 Byte
• Supply Voltage (max): 5.5 V
• Supply Voltage (min): 2 V
• Maximum Operating Temperature: + 70 C
• Minimum Operating Temperature: 0 C
• Mounting Style: SMD/SMT
• Rtc Bus Interface: Serial (4-Wire, SPI)
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Extremely Accurate SPI Bus RTC with
Integrated Crystal and SRAM
Figure 1. Address Map for DS3234 Timekeeping Registers and SRAM
Note: Unless otherwise specified, the registers’ state is not defined when power is first applied. Bits defined as 0 cannot be written
to 1 and will always read 0.
12
14h–17h
0Ah
0Bh
0Ch
0Dh
00h
01h
02h
03h
04h
05h
06h
07h
08h
09h
0Eh
0Fh
10h
11h
12h
13h
18h
19h
READ/WRITE
ADDRESS
____________________________________________________________________
94h–97h
80h
81h
82h
83h
84h
85h
86h
87h
88h
89h
8Ah
8Bh
8Ch
8Dh
8Eh
8Fh
90h
91h
92h
93h
98h
99h
Century
A1M1
A1M2
A1M3
A1M4
A2M2
A2M3
A2M4
EOSC
DATA
BIT 7
SIGN
SIGN
MSB
OSF
D7
A7
—
0
0
0
0
0
0
BB32kHz CRATE1 CRATE0 EN32kHz
BBSQW
DY/DT
DY/DT
DATA
DATA
DATA
BIT 6
12/24
12/24
12/24
D6
A6
—
0
0
0
0
10 Year
10 Seconds
10 Seconds
10 Minutes
10 Minutes
10 Minutes
AM/PM
AM/PM
AM/PM
CONV
DATA
DATA
BIT 5
20 hr
20 hr
20 hr
A5
D5
—
0
0
0
0
10 Date
10 Date
10 Date
0
0
10 Mo
DATA
DATA
BIT 4
10 hr
10 hr
10 hr
RS2
A4
D4
—
0
0
0
DATA
DATA
BIT 3
RS1
D3
A3
—
0
0
0
INTCN
DATA
DATA
BIT 2
BSY
D2
A2
—
0
0
Seconds
Seconds
Minutes
Minutes
Minutes
Month
Hour
Hour
Hour
Date
Year
Date
Date
Day
Day
DATA
DATA
A2IE
BIT 1
A2F
Day
A1
D1
—
0
0
BB_TD
DATA
DATA
BIT 0
A1IE
LSB
A1F
A0
D0
—
0
Alarm 1 Date
Crystal Aging
Alarm 1 Day
Alarm 2 Date
Alarm 2 Day
Conversions
FUNCTION
SRAM Data
Temp MSB
Temp LSB
Reserved
Seconds
Seconds
Address
Minutes
Century
Minutes
Minutes
Control/
Alarm 1
Alarm 1
Alarm 1
Alarm 2
Alarm 2
Disable
Control
Month/
Status
SRAM
Hours
Hours
Hours
Offset
Temp
Date
Year
Day
01-12 + Century
1-12 +AM /PM
1-12 +AM /PM
1-12 +AM /PM
Read Only
Read Only
RANGE
00–59
00–59
00-23
01-31
00-99
00-59
00-59
00-23
01-31
00-59
00-23
01-31
1-7
1-7
1-7
—
—
—
—
—
—
—