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  Microchip Technology Semiconductor Electronic Components Datasheet  

MCP7940M Datasheet

Real-Time Clock/Calendar

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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


  Microchip Technology Semiconductor Electronic Components Datasheet  

MCP7940M Datasheet

Real-Time Clock/Calendar

No Preview Available !

MCP7940M
FIGURE 1-1:
TYPICAL APPLICATION SCHEMATIC
VCC
PIC® MCU
VCC
VCC
8
VCC
X1 1
6 SCL
5
MCP7940M
SDA
X2
2
7 MFP
VSS
4
FIGURE 1-2:
VCC
VSS
BLOCK DIAGRAM
Power
Supply
SCL
SDA
X1
X2
I2C™ Interface
and Addressing
32.768 kHz
Oscillator
Control Logic
SRAM
Clock Divider
Digital Trimming
Square Wave
Output
Alarms
MFP
Output Logic
CX1
CX2
Configuration
Seconds
Minutes
Hours
Day of Week
Date
Month
Year
DS20002292B-page 2
2012-2014 Microchip Technology Inc.


Part Number MCP7940M
Description Real-Time Clock/Calendar
Maker Microchip
Total Page 30 Pages
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