MCP79400

The MCP79400 general purpose I2CTM 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 in a locked section of EEPROM that can be unlocked and programmed 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
  • Factory standard or custom ID programming available
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 Blank ID Blank ID
Temperature Range (C) -40 to +85 -40 to +85
Documents
MCP79400/01/02 Battery-Backed I2C RTCC w/ SRAM and Protected EEPROMData Sheets03/04/2015890KB
MCP7940X Family Silicon ErrataErrata12/15/201570KB
AN1355 - A Complete Electronic Watch Based on MCP79410 I2C? RTCCAppNote06/23/2016154KB
AN1364 - Using the Alarm Feature on the MCP79410 RTCC to Implement a Delayed AlarmAppNote10/20/2010123KB
AN1365 - Recommended Usage of Microchip Serial RTCC DevicesAppNote03/28/2013267KB
AN1413 - Temperature Compensation of a Tuning Fork Crystal Based on MCP79410AppNote11/07/2011479KB
AN1414 - Using HI-TECH C Compiler to Interface RTCC Devices to 8-Bit PIC MCUsAppNote01/31/20124847KB
AN1491 - Configuring the MCP794XX RTCC FamilyAppNote01/25/2013246KB
AN1496 - Debugging Stand-Alone Real-Time Clock/Calender-based ApplicationsAppNote02/22/2013215KB
AN1519 - Recommended Crystals for Microchip Stand-Alone Real-Time Clock/Calendar DevicesAppNote09/16/2013397KB
AN2027 - Backup Power Sources for Microchip's RTCCs and SRAMsAppNote12/01/2015161KB
TB3116 - Questions and Answers Concerning MCP79XXX Serial RTCCsAppNote08/11/201475KB
Enabling Intelligent Automation Using the MCP7941X I2C RTCCTech Briefs10/21/201074KB
I2C & SPI Real-Time Clock/Calendar Sell SheetBrochures07/21/2014703KB
MCP794xx I2C Real-Time Clock/Calendar BrochureBrochures10/27/2010141KB
MCP794xx Reference Layout Gerber FilesGerber Files05/25/201150KB
AN1355 PIC18F Source CodeSample Code08/21/201261KB
AN1355 PIC24F Source CodeSample Code08/21/2012152KB
Ordering Information
Part NumberLeadsPackage TypeTemp RangePacking1+26+100+1000+5000+
MCP79400-I/MS8MSOP-40C to +85CTUBE0.860.800.750.710.69
MCP79400-I/SN8SOIC-40C to +85CTUBE0.820.760.720.680.66
MCP79400-I/ST8TSSOP-40C to +85CTUBE0.860.800.750.710.69
MCP79400T-I/MNY8TDFN-40C to +85CT/R0.900.830.790.740.72
MCP79400T-I/MS8MSOP-40C to +85CT/R0.860.800.750.710.69
MCP79400T-I/SN8SOIC-40C to +85CT/R0.820.760.720.680.66
MCP79400T-I/ST8TSSOP-40C to +85CT/R0.860.800.750.710.69
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RoHS Information
PartNumberDeviceWeightShippingWeightLeadCountPackageTypePackageWidthSolderCompositionJEDECIndicatorRoHSChinaEFUP
MCP79400-I/SN0.0780000.1600008SOIC.150In(3.90mm)Matte Tine3
MCP79400T-I/SN0.0780000.2303038SOIC.150In(3.90mm)Matte Tine3
MCP79400-I/ST0.0330000.0900008TSSOP4.4mmMatte Tine3
MCP79400T-I/ST0.0330000.2156008TSSOP4.4mmMatte Tine3
MCP79400-I/MS0.0256000.0700008MSOP3x3mmMatte Tine3
MCP79400T-I/MS0.0256000.2156008MSOP3x3mmMatte Tine3
MCP79400T-I/MNY0.0143000.2484858TDFN2x3x0.8mmNiPdAue4
MCP79400/01/02 Battery-Backed I2C RTCC w/ SRAM and Protected EEPROM MCP79402
MCP7940X Family Silicon Errata MCP79402
AN1355 MCP79412
AN1355 Source Code MCP79412
AN1364 MCP79412
AN1364 Source Code MCP79412
AN1365 MCP795W22
AN1413 MCP795W22
AN1413 Source Code MCP795W22
AN1414 MCP79412
Source Code AN1414 MCP79412
AN1491 MCP79412
01491 Source Code MCP79412
AN1491 Source Code MCP79412
AN1496 MCP79412
AN1519 MCP795W22
AN2027 MCP795W22
TB3116 MCP795W22
Enabling Intelligent Automation Using the MCP7941X I2C RTCC MCP79412
I2C & SPI Real-Time Clock/Calendar Sell Sheet MCP795W22
MCP794xx I2C Real-Time Clock/Calendar Brochure MCP79412
MCP794xx Reference Layout Gerber Files MCP79412
AN1355 PIC18F Source Code MCP79412
AN1355 PIC24F Source Code MCP79412
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