DS3232 Maxim, DS3232 Datasheet - Page 8

• Manufacturer Part Number: DS3232
• Description: The DS3232 is a low-cost temperature-compensated crystal oscillator (TCXO) with a very accurate, temperature-compensated, integrated real-time clock (RTC) and 236 bytes of battery-backed SRAM
• Manufacturer: Maxim

Extremely Accurate I
Integrated Crystal and SRAM
The DS3232 is a serial RTC driven by a temperature-
compensated 32kHz crystal oscillator. The TCXO pro-
vides 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
8
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V
GND
SCL
SDA
V
BAT
CC
X1
X2
Detailed Description
ADDRESS REGISTER
I
CAPACITOR ARRAY
2
OSCILLATOR AND
POWER CONTROL
C INTERFACE AND
DECODE
DS3232
CONTROL LOGIC/
TEMPERATURE
2
DIVIDER
SENSOR
C RTC with
alarm conditions or a square-wave output. The clock/cal-
endar provides seconds, minutes, hours, day, date,
month, and year information. The date at the end of the
month is automatically adjusted for months with fewer
than 31 days, including corrections for leap year. The
clock operates in either the 24-hour or 12-hour format
with an AM/PM indicator. The internal registers are
accessible though an I
A temperature-compensated voltage reference and
comparator circuit monitors the level of V
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
2
C bus interface.
Block Diagram
V
CC
N
N
CC
32kHz
INT/SQW
RST
to detect