Integrated Crystal and SRAM

8

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Block Diagram

N

N

RST

INT/SQW

CLOCK AND CALENDAR

REGISTERS

SRAM

USER BUFFER

(7 BYTES)

ADDRESS REGISTER

DECODE

POWER CONTROL

GND

SCL

SDA

TEMPERATURE

SENSOR

CONTROL LOGIC/

DIVIDER

SQUARE-WAVE BUFFER;

INT/SQW CONTROL

CONTROL AND STATUS

REGISTERS

VOLTAGE REFERENCE;

DEBOUNCE CIRCUIT;

PUSHBUTTON RESET

OSCILLATOR AND

CAPACITOR ARRAY

X1

X2

DS3232

32kHz

Detailed Description

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

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

A temperature-compensated voltage reference and