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MCP79412T-I/SN

I2C RTC with EEPROM, 48-bit unique ID, dual alarm, SOIC-8, battery backup, calibration

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Manufacturer Part：

MCP79412T-I/SN

Package：

SOIC-8 (4.90 x 3.91 x 1.58 mm)

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Description

Product Overview

The MCP79412T-I/SN from Microchip Technology is an I2C RTC (Real-Time Clock) with 64 bytes of EEPROM and a unique 48-bit ID in an SOIC-8 package. It provides accurate timekeeping with battery backup, programmable alarms, and calibration for drift correction.

Key Specifications

Interface I2C (up to 400kHz)
Timekeeping Seconds through century calendar
EEPROM 64 bytes (SRAM) + 128 bytes EEPROM
Unique ID 48-bit pre-programmed EUI-48
Alarms 2 programmable
Supply Voltage 1.8 V to 5.5 V
Battery Backup Yes (VBAT pin)
Operating Temperature -40C to +85C

Features

  • Complete RTC with date, time, and century tracking
  • 48-bit unique ID for device identification
  • 64 bytes battery-backed SRAM for critical data
  • 128 bytes EEPROM for non-volatile parameter storage
  • Two programmable alarms with interrupt output
  • Digital calibration for crystal drift compensation

Applications

  • Embedded system timekeeping with battery backup
  • Data logging timestamps
  • Power management wake-up scheduling
  • Device identification using 48-bit unique ID

The MCP79412T-I/SN from Microchip Technology is an I2C Real-Time Clock (RTC) with integrated EEPROM and a unique 48-bit ID in an SOIC-8 package. The device maintains seconds, minutes, hours, day, date, month, year, and century with automatic leap year correction. A battery backup input (VBAT) maintains timekeeping when main power is lost. The device includes 64 bytes of battery-backed SRAM, 128 bytes of EEPROM, and two programmable alarms with interrupt output. Digital calibration allows correction of crystal frequency drift over temperature. The 48-bit pre-programmed unique ID provides device identification for security or inventory management.

The MCP79412T-I/SN integrates an RTC, EEPROM, and unique ID on a single chip. (1) RTC: A 32.768kHz crystal oscillator provides the timebase. The oscillator drives a counter chain that divides down to 1Hz for seconds counting. The time and date registers are accessed via I2C. The oscillator can be digitally calibrated by adding or subtracting clock cycles over a calibration window, compensating for crystal frequency tolerance and temperature drift. (2) Battery Backup: When VCC falls below VBAT, the internal power switch connects the RTC and SRAM to the VBAT supply, maintaining timekeeping. The oscillator automatically switches to low-power mode. (3) Alarms: Two alarm registers can be set to match any combination of seconds, minutes, hours, day, or date. When a match occurs, the MFP output is asserted and the alarm flag is set. (4) EEPROM: 128 bytes of non-volatile EEPROM are accessed via separate I2C address, with 1 million write cycle endurance.

Pin Name Type Function
1 X1 Input 32.768kHz crystal input
2 X2 Output 32.768kHz crystal output
3 VBAT Power Battery backup supply
4 VSS Ground Ground
5 SDA I/O I2C data
6 SCL Input I2C clock
7 MFP Output Multi-function output (alarm/interrupt)
8 VCC Power Main supply (1.8-5.5V)
  • Embedded system timekeeping with battery backup for power-loss recovery
  • Data logging timestamps with digital calibration for accuracy
  • Power management wake-up scheduling with dual alarms
  • Device identification and security using 48-bit pre-programmed unique ID
Manufacturer Part Number Package Notes
Microchip MCP79410T-I/SN SOIC-8 Without unique ID
Microchip MCP79411T-I/SN SOIC-8 With EUI-48 ID, no EEPROM
Maxim DS3231SN# SOIC-16 TCXO RTC, higher accuracy
ST M41T62Q6F QFN-16 Small RTC with event
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Contact Information

Email: info@materialparts.com

Tel / WhatsApp: +86 13760382860

Service & Packaging

Materialparts is a professional electronic component supplier based in Shenzhen, China, with over 20 years of global trading experience. We integrate component procurement, quality inspection, technical support, customized packaging, and global delivery services to provide one-stop supply chain solutions. Our business covers industrial control, automotive electronics, consumer electronics, medical devices and other industries. We always adhere to genuine sources, stable supply and considerate after-sales service.

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Contact Information

For service consultation or packaging customization, please feel free to contact us:
Email: info@materialparts.com
Tel / WhatsApp: +86 13760382860
Address: Room 2919, Guoli Building, Huaqiang North, Futian District, Shenzhen, Guangdong, China
 

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