Description

The MCP7940N-I/SN is a low-power real-time clock (RTC) IC that uses digital timing compensation for an accurate clock/calendar, a programmable output control for versatility, and a power sense circuit that automatically switches to the backup supply. Using a low-cost 32.768kHz crystal, it tracks time using several internal registers. For communication, the MCP7940N-I/SN uses the I?C?? bus. The clock/calendar automatically adjusts for months with fewer than 31 days, including corrections for leap years. The clock operates in the 24 or 12-hour format with an AM/PM indicator and settable alarm(s) to the second, minute, hour, day of the week, date, or month. Using the programmable CLKOUT, frequencies of 32.768, 8.192, and 4.096kHz and 1Hz can be generated from the external crystal. The device is fully accessible through the serial interface while VCC is between 1.8 and 5.5V, but can operate down to 1.3V for timekeeping and SRAM retention only.
Applications:

Clock & Timing
Automotive

Features:

12/24 Hour mode battery-backed Real-time Clock/Calendar (RTCC)
1PPM Resolution, ?129PPM Range On-chip Digital Trimming/Calibration
Dual Programmable Alarms
Clock output with selectable frequency, Alarm output, General Purpose output Versatile Output Pin
Time logged on switchover to and from Battery Backup Power-Fail Time-Stamp
64-byte Battery-backed SRAM
Low-power Consumption
1.3 to 5.5V Backup Voltage
Low Typical Timekeeping Current: ?? Operating from VCC: 1.2 ?A at 3.3V ?? Operating from battery backup: 925 nA at 3.0V
Automatic Switchover to Battery Backup
Supplier??s original packaging: Tube

Package Includes:
1 x MCP7940N-I/SN MICROCHIP Alarm RTC IC, Year/Month/Week/Date/Hr/Min/Sec 12Hr / 24Hr, I2C, 1.8 V to 5.5 V, SOIC-8