DS3231M+ Maxim Integrated Products, DS3231M+ Datasheet - Page 8

• Manufacturer Part Number: DS3231M+
• Description: Real Time Clock +/-5ppm, I2C Real-Ti me Clock with Intern
• Manufacturer: Maxim Integrated Products

Specifications of DS3231M+

• Function: Clock, Calendar, Alarm
• Supply Voltage (max): 5.5 V
• Supply Voltage (min): 2.3 V
• Maximum Operating Temperature: + 85 C
• Minimum Operating Temperature: - 40 C
• Mounting Style: SMD/SMT
• Rtc Bus Interface: I2C
• Supply Current: 300 uA
• Package / Case: SOIC-16
• Time Format: HH:MM:SS
• Date Format: YY-MM-DD
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

The DS3231M is a serial real-time clock (RTC) driven by
an internal, temperature-compensated, microelectrome-
chanical systems (MEMS) resonator. The oscillator pro-
vides a stable and accurate reference clock and main-
tains the RTC to within Q0.432 seconds-per-day accu-
racy from -40NC to +85NC. The RTC is a low-power clock/
calendar with two programmable time-of-day alarms. INT/
SQW provides either an interrupt signal due to alarm
conditions or a 1Hz square wave. The clock/calendar
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
±5ppm, I
8
8 SO
7
8
PIN
16 SO
V
GND
SDA
V
RST
SCL
BAT
CC
15
16
NAME
SDA
SCL
N
2
Detailed Description
R
C Real-Time Clock
PU
Serial-Data Input/Output. This pin is the data input/output for the I
pin requires an external pullup resistor. The pullup voltage can be up to 5.5V, regardless of the volt-
age on V
Serial-Clock Input. This pin is the clock input for the I
data movement on the serial interface. The pullup voltage can be up to 5.5V, regardless of the
voltage on V
DS3231M
INTERFACE
CONTROL
POWER
I
2
C
CC
.
CC
.
RESONATOR
TIME-BASE
SENSOR
TEMP
CONTROL AND STATUS
REGISTERS
DIVIDER
FACTORY TRIM
ADJUSTMENT
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
ed voltage reference and comparator circuit monitors the
level of V
switch to the backup supply when necessary. The RST
pin provides an external pushbutton function and acts as
an indicator of a power-fail event.
The Block Diagram shows the device’s main elements.
Each of the major blocks is described separately in the
following sections.
DIGITAL
FUNCTION
CLOCK/CALENDAR
CC
WITH ALARM
2
to detect power failures and to automatically
1Hz
C bus interface. A temperature-compensat-
Pin Description (continued)
2
C serial interface and is used to synchronize
INTERRUPT
SELECT
OR 1Hz
2
C serial interface. This open-drain
Block Diagram
N
N
Operation
32KHZ
INT/SQW