MCP79402 _ BDTIC a Leading Distributor in China

MCP79402

The MCP79402 general purpose I²C^TM Compatible real-time clock/calendar (RTCC) is highly integrated with memory and advanced features normally found in higher priced devices. These features include a battery switchover circuit for backup power, a timestamp to log power failures and digital trimming for accuracy. 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. In addition to the SRAM memory, there a unique ID that is factory programmed in a locked section of EEPROM with a MAC Address. This ID can also be unlocked and reprogrammed by the end user.

Features

Low Power Operation VCC Min = 1.8V Icc < 5 µA Typical Dynamic Current
VCC Min = 1.8V
Icc < 5 µA Typical Dynamic Current
Low Backup Power VBAT Min = 1.3V Ibat < 700nA Typical Timekeeping & SRAM Retention Current
VBAT Min = 1.3V
Ibat < 700nA Typical Timekeeping & SRAM Retention Current
Automatic Battery Switchover with Timestamp VCC to VBAT (power lost) VBAT to VCC (power restored)
VCC to VBAT (power lost)
VBAT to VCC (power restored)
Dual alarms with single Interrupt Output that operates on VCC or VBAT
Clock Out frequencies of 32.768, 8.192 & 4.096 KHz and 1 Hz
Digital Trimming Range from -127 to + 127 ppm in 1 ppm steps 1 ppm is approximately 86 milliseconds/day
1 ppm is approximately 86 milliseconds/day
EEPROM uses 8 bytes/page with Block Sector write protection Protect none, 1/4, 1/2 or all of array
Protect none, 1/4, 1/2 or all of array
Unique ID is factory programmed with MAC Address

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
Unique ID (bits) 64	64
Unique ID Programming EUI-64	EUI-64
Temperature Range (C) -40 to +85	-40 to +85

Documents

MCP79400/01/02 Battery-Backed I2C RTCC w/ SRAM and Protected EEPROM	Data Sheets	03/04/2015	890KB
MCP7940X 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
AN2027 - Backup Power Sources for Microchip's RTCCs and SRAMs	AppNote	12/01/2015	161KB
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
I2C & SPI Real-Time Clock/Calendar Sell Sheet	Brochures	07/21/2014	703KB
MCP794xx I2C Real-Time Clock/Calendar Brochure	Brochures	10/27/2010	141KB
MCP794xx Reference Layout Gerber Files	Gerber Files	05/25/2011	50KB
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+
MCP79402-I/MS	8	MSOP	-40C to +85C	TUBE	0.94	0.87	0.82	0.78	0.75
MCP79402-I/SN	8	SOIC	-40C to +85C	TUBE	0.90	0.83	0.79	0.74	0.72
MCP79402-I/ST	8	TSSOP	-40C to +85C	TUBE	0.94	0.87	0.82	0.78	0.75
MCP79402T-I/MNY	8	TDFN	-40C to +85C	T/R	0.98	0.91	0.86	0.81	0.78
MCP79402T-I/MS	8	MSOP	-40C to +85C	T/R	0.94	0.87	0.82	0.78	0.75
MCP79402T-I/SN	8	SOIC	-40C to +85C	T/R	0.90	0.83	0.79	0.74	0.72
MCP79402T-I/ST	8	TSSOP	-40C to +85C	T/R	0.94	0.87	0.82	0.78	0.75

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RoHS Information

PartNumber	DeviceWeight	ShippingWeight	LeadCount	PackageType	PackageWidth	SolderComposition	JEDECIndicator
MCP79402-I/SN	0.078000	0.160000	8	SOIC	.150In(3.90mm)	Matte Tin	e3
MCP79402T-I/SN	0.078000	0.230303	8	SOIC	.150In(3.90mm)	Matte Tin	e3
MCP79402T-I/ST	0.033000	0.215600	8	TSSOP	4.4mm	Matte Tin	e3
MCP79402-I/ST	0.033000	0.090000	8	TSSOP	4.4mm	Matte Tin	e3
MCP79402-I/MS	0.025600	0.070000	8	MSOP	3x3mm	Matte Tin	e3
MCP79402T-I/MS	0.025600	0.215600	8	MSOP	3x3mm	Matte Tin	e3
MCP79402T-I/MNY	0.014300	0.248485	8	TDFN	2x3x0.8mm	NiPdAu	e4