MCP7940M Datasheet, PDF (1/38 Pages) Microchip Technology – Low-Cost I2C™ Real-Time Clock/Calendar with SRAM

MCP7940M
Low-Cost I²C™ Real-Time Clock/Calendar with SRAM
Device Selection Table
Part Number
SRAM
(Bytes)
MCP7940M
64
Features:
• Real-Time Clock/Calendar (RTCC):
- Hours, Minutes, Seconds, Day of Week, Day,
Month and Year
- Dual alarm with single output
• On-Chip Digital Trimming/Calibration:
- Range -127 to +127 ppm
- Resolution 1 ppm
• Programmable Open-Drain Output Control:
- CLKOUT with 4 selectable frequencies
- Alarm output
• 64 Bytes SRAM
• Low-Power CMOS Technology:
- Dynamic Current: 400 A max write
• 100 kHz and 400 kHz Compatibility
• ESD Protection >4,000V
• Packages include 8-Lead SOIC, TSSOP, 2x3
TDFN, MSOP and PDIP
• Pb-Free and RoHS Compliant
• Temperature Ranges:
- Industrial (I): -40°C to +85°C
Description:
The MCP7940M series of low-power Real-Time Clocks
(RTC) uses digital timing compensation for an accurate
clock/calendar and a programmable output control for
versatility. Using a low-cost 32.768 kHz crystal, it tracks
time using several internal registers. For
communication, the MCP7940M uses the I²C™ bus.
The clock/calendar automatically adjusts for months
with fewer than 31 days, including corrections for
leap years. The clock operates in either the 24-hour
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 4.096
kHz and 1 Hz can be generated from the external
crystal.
The RTC series of devices are available in the standard
8-lead SOIC, TSSOP, MSOP, PDIP and 2x3 TDFN
packages.
Package Types
X1 1
X2 2
NC 3
VSS 4
MSOP
TDFN
8 VCC
X1 1
7 MFP _{X2 2}
8 VCC
7 MFP
6 SCL NC ₃
6 SCL
5 SDA ^{VSS 4}
5 SDA
SOIC, TSSOP
PDIP
X1 1
X2 2
NC 3
VSS 4
8 _{VCC X1 1}
7 _{MFP X2 2}
6 _{SCL NC 3}
5 _SDA VSS ₄
8 VCC
7 MFP
6 SCL
5 SDA
 2012 Microchip Technology Inc.
Preliminary
DS22292A-page 1