DS3232M集成电路（IC）的实时时钟规格书PDF中文资料

General Description

The DS3232M is a low-cost, extremely accurate, I2C

real-time clock (RTC) with 236 bytes of battery-backed

SRAM. The device incorporates a battery input and

maintains accurate timekeeping when main power to the

device is interrupted. The integration of the microelectromechanical systems (MEMS) resonator enhances the

long-term accuracy of the device and reduces the piecepart count in a manufacturing line.

The RTC maintains 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. Two programmable time-of-day

alarms and a 1Hz output are provided. Address and data

are transferred serially through an I2C bidirectional bus.

A precision temperature-compensated voltage reference

and comparator circuit monitors the status of VCC to

detect power failures, to provide a reset output, and to

automatically switch to the backup supply when necessary. Additionally, the RST pin is monitored as a pushbutton input for generating a microprocessor reset. See the

Block Diagram for more details.

Applications

Power Meters

Industrial Applications

特性 Features

S Timekeeping Accuracy ±5ppm (±0.432 Second/

Day) from -40NC to +85NC

S 236 Bytes of Battery-Backed User SRAM

S Battery Backup for Continuous Timekeeping

S Low Power Consumption

S Functionally Compatible to DS3232

S Complete Clock Calendar Functionality Including

Seconds, Minutes, Hours, Day, Date, Month, and

Year with Leap Year Compensation Up to Year

2100

S Two Time-of-Day Alarms

S 1Hz and 32.768kHz Outputs

S Reset Output and Pushbutton Input with

Debounce

S Fast (400kHz) I2C-Compatible Serial Bus

S +2.3V to +4.5V Supply Voltage

S Digital Temp Sensor with ±3NC Accuracy

S -40NC to +85NC Temperature Range

S 8-Pin SO (150 mils) Package

S Underwriters Laboratories (UL) Recognized