DS3234S+ Maxim Integrated, DS3234S+ Datasheet - Page 9

• Manufacturer Part Number: DS3234S+
• Description: Real Time Clock
• Manufacturer: Maxim Integrated
• Series: DS3234r

Specifications of DS3234S+

• Rohs: yes

The DS3234 is a TCXO and RTC with integrated crystal
and 256 bytes of SRAM. An integrated sensor periodi-
cally samples the temperature and adjusts the oscilla-
tor load to compensate for crystal drift caused by
temperature variations. The DS3234 provides user-
selectable sample rates. This allows the user to select
a temperature sensor sample rate that allows for vari-
ous temperature rates of change, while minimizing cur-
rent consumption by temperature sensor sampling. The
user should select a sample rate based upon the
SCLK
DOUT
SCLK
V
GND
V
DIN
BAT
CS
CC
X1
X2
Detailed Description
Extremely Accurate SPI Bus RTC with
SPI INTERFACE AND
ADDRESS REGISTER
CAPACITOR ARRAY
POWER CONTROL
OSCILLATOR AND
DECODE
_____________________________________________________________________
DS3234
Integrated Crystal and SRAM
CONTROL LOGIC/
TEMPERATURE
SENSOR
DIVIDER
expected temperature rate of change, with faster sam-
ple rates for applications where the ambient tempera-
ture changes significantly over a short time. The TCXO
provides a stable and accurate reference clock, and
maintains the RTC to within ±2 minutes per year accu-
racy from -40°C to +85°C. The TCXO frequency output
is available at the 32kHz pin. The RTC is a low-power
clock/calendar with two programmable time-of-day
alarms and a programmable square-wave output. The
INT/SQW provides either an interrupt signal due to
alarm conditions or a square-wave output. The
clock/calendar provides seconds, minutes, hours, day,
SQUARE-WAVE BUFFER;
CLOCK AND CALENDAR
CONTROL AND STATUS
VOLTAGE REFERENCE;
DEBOUNCE CIRCUIT;
PUSHBUTTON RESET
INT/SQW CONTROL
USER BUFFER
REGISTERS
REGISTERS
(7 BYTES)
SRAM
Block Diagram
V
CC
N
N
32kHz
INT/SQW
RST
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