MCP7940M _ BDTIC a Leading Distributor in China

MCP7940M

The MCP7940M I²C^TM compatible real-time clock/calendar (RTCC) includes SRAM and a digital trimming circuit for accuracy which is normally found in higher priced devices. Using a low-cost 32,768 kHz crystal or other clock source, time is tracked in either a 12-hour or 24-hour format with an AM/PM indicator and timing to the second, minute, hour, day of the week, day, month and year. As an interrupt or wakeup signal, a multifunction open drain output can be programmed as an Alarm Out or as a Clock Out that supports 4 selectable frequencies.

Features

Real-Time Clock/Calendar (RTCC) Hours, Minutes, Seconds, Day of Week, Day, Month, Year Leap year compensated to 2399 12/24 hour modes
Hours, Minutes, Seconds, Day of Week, Day, Month, Year
Leap year compensated to 2399
12/24 hour modes
On-Chip Digital Trimming/Calibration 1 PPM Resolution ±129 PPM Range
1 PPM Resolution
±129 PPM Range
Dual Programmable Alarms
Versatile Output Pin Clock output with selectable frequency Alarm output General Purpose output
Clock output with selectable frequency
Alarm output
General Purpose output
64 Bytes SRAM
2-Wire Serial Interface, I2C™Compatible I2C Clock Frequency up to 400 kHz
I2C Clock Frequency up to 400 kHz
Wide Voltage Range Operating Voltage 1.8V to 5.5V
Operating Voltage 1.8V to 5.5V
Low Typical Timekeeping Current

Parameter

Parameter Name Value	Value
Max Communications Speed 400 KHz	400 KHz
Pin Count 8	8
Minimum Clock Count (seconds) 1 sec	1 sec
Battery-backed SRAM (Bytes) 64	64
Temperature Range (C) -40 to +85	-40 to +85

Documents

MCP7940M Low-Cost I2C RTCC with SRAM	Data Sheets	06/23/2014	1266KB
MCP7940M Family Silicon Errata	Errata	12/15/2015	70KB
AN1355 - A Complete Electronic Watch Based on MCP79410 I2C? RTCC	AppNote	06/23/2016	154KB
AN1364 - Using the Alarm Feature on the MCP79410 RTCC to Implement a Delayed Alarm	AppNote	10/20/2010	123KB
AN1365 - Recommended Usage of Microchip Serial RTCC Devices	AppNote	03/28/2013	267KB
AN1413 - Temperature Compensation of a Tuning Fork Crystal Based on MCP79410	AppNote	11/07/2011	479KB
AN1414 - Using HI-TECH C Compiler to Interface RTCC Devices to 8-Bit PIC MCUs	AppNote	01/31/2012	4847KB
AN1491 - Configuring the MCP794XX RTCC Family	AppNote	01/25/2013	246KB
AN1496 - Debugging Stand-Alone Real-Time Clock/Calender-based Applications	AppNote	02/22/2013	215KB
AN1519 - Recommended Crystals for Microchip Stand-Alone Real-Time Clock/Calendar Devices	AppNote	09/16/2013	397KB
TB3116 - Questions and Answers Concerning MCP79XXX Serial RTCCs	AppNote	08/11/2014	75KB
Enabling Intelligent Automation Using the MCP7941X I2C RTCC	Tech Briefs	10/21/2010	74KB
AN1355 PIC18F Source Code	Sample Code	08/21/2012	61KB
AN1355 PIC24F Source Code	Sample Code	08/21/2012	152KB

Ordering Information

Part Number	Leads	Package Type	Temp Range	Packing	1+	26+	100+	1000+	5000+
MCP7940M-I/MS	8	MSOP	-40C to +85C	TUBE	0.62	0.57	0.54	0.51	0.50
MCP7940M-I/P	8	PDIP	-40C to +85C	TUBE	0.64	0.59	0.56	0.53	0.51
MCP7940M-I/SN	8	SOIC	-40C to +85C	TUBE	0.58	0.54	0.51	0.48	0.46
MCP7940M-I/ST	8	TSSOP	-40C to +85C	TUBE	0.62	0.57	0.54	0.51	0.50
MCP7940MT-I/MNY	8	TDFN	-40C to +85C	T/R	0.66	0.61	0.58	0.54	0.53
MCP7940MT-I/MS	8	MSOP	-40C to +85C	T/R	0.62	0.57	0.54	0.51	0.50
MCP7940MT-I/SN	8	SOIC	-40C to +85C	T/R	0.58	0.54	0.51	0.48	0.46
MCP7940MT-I/ST	8	TSSOP	-40C to +85C	T/R	0.62	0.57	0.54	0.51	0.50

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RoHS Information

PartNumber	DeviceWeight	ShippingWeight	LeadCount	PackageType	PackageWidth	SolderComposition	JEDECIndicator
MCP7940M-I/P	0.486700	0.900000	8	PDIP	.300in	Matte Tin	e3
MCP7940MT-I/SN	0.078000	0.230303	8	SOIC	.150In(3.90mm)	Matte Tin	e3
MCP7940M-I/SN	0.078000	0.160000	8	SOIC	.150In(3.90mm)	Matte Tin	e3
MCP7940MT-I/ST	0.033000	0.215600	8	TSSOP	4.4mm	Matte Tin	e3
MCP7940M-I/ST	0.033000	0.090000	8	TSSOP	4.4mm	Matte Tin	e3
MCP7940MT-I/STVAO	0.033000	0.215600	8	TSSOP	4.4mm	Matte Tin	e3
MCP7940M-I/MS	0.025600	0.070000	8	MSOP	3x3mm	Matte Tin	e3
MCP7940MT-I/MS	0.025600	0.215600	8	MSOP	3x3mm	Matte Tin	e3
MCP7940MT-I/MNY	0.014300	0.248485	8	TDFN	2x3x0.8mm	NiPdAu	e4