MCP7940M_14 Datasheet, PDF (1/52 Pages) Microchip Technology – Leap year compensated to 2399

MCP7940M
Low-Cost I²C™ Real-Time Clock/Calendar with SRAM
Timekeeping Features:
• Real-Time Clock/Calendar (RTCC):
- Hours, Minutes, Seconds, Day of Week, Day,
Month, Year
- Leap year compensated to 2399
- 12/24 hour modes
• Oscillator for 32.768 kHz Crystals:
- Optimized for 6-9 pF crystals
• On-Chip Digital Trimming/Calibration:
- ±1 PPM resolution
- ±129 PPM range
• Dual Programmable Alarms
• Versatile Output Pin:
- Clock output with selectable frequency
- Alarm output
- General purpose output
Low-Power Features:
• Wide Voltage Range:
- Operating voltage range of 1.8V to 5.5V
• Low Typical Timekeeping Current:
- Operating from VCC: 1.2 µA at 3.3V
User Memory:
• 64-byte SRAM
Operating Ranges:
• 2-Wire Serial Interface, I²C™ Compatible
- I²C clock rate up to 400 kHz
• Temperature Range:
- Industrial (I): -40°C to +85°C
Packages:
• 8-Lead SOIC, MSOP, TSSOP, PDIP and 2x3
TDFN
General Description:
The MCP7940M Real-Time Clock/Calendar (RTCC)
tracks time using internal counters for hours, minutes,
seconds, days, months, years, and day of week.
Alarms can be configured on all counters up to and
including months. For usage and configuration, the
MCP7940M supports I²C communications up to 400
kHz.
The open-drain, multi-functional output can be
configured to assert on an alarm match, to output a
selectable frequency square wave, or as a general
purpose output.
The MCP7940M is designed to operate using a 32.768
kHz tuning fork crystal with external crystal load
capacitors. On-chip digital trimming can be used to
adjust for frequency variance caused by crystal
tolerance and temperature.
Package Types
SOIC, MSOP, TSSOP, PDIP
X1 1
X2 2
NC 3
VSS 4
8 VCC
7 MFP
6 SCL
5 SDA
TDFN
X1 1
X2 2
NC 3
VSS 4
8 VCC
7 MFP
6 SCL
5 SDA
 2012-2014 Microchip Technology Inc.
DS20002292B-page 1