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MCP79412-I/SN

Name: MCP79412-I/SN
Rating: 4.7 (12 reviews)

IC RTC CLK/CALENDAR I2C 8-SOIC

製造商
製造商。部分 #MCP79412-I/SN
包 8-SOIC (0.154, 3.90mm Width)
資料表 MCP79412-I/SN DataSheet
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規格

Supplier	Microchip Technology
Package	Tube
ProductStatus	Active
Type	Clock/Calendar
Features	Alarm, Leap Year, Square Wave Output, SRAM, Unique ID
MemorySize	64B, 1Kb
TimeFormat	HH:MM:SS (12/24 hr)
DateFormat	YY-MM-DD-dd
Interface	I²C, 2-Wire Serial
Voltage-Supply	1.8V ~ 5.5V
Voltage-SupplyBattery	1.3V ~ 5.5V
Current-Timekeeping(Max)	1.2µA @ 3.3V
OperatingTemperature	-40°C ~ 85°C
MountingType	Surface Mount
Package/Case	8-SOIC (0.154, 3.90mm Width)

概述

Description

The MCP79412-I/SN is Microchip’s I2C Real‑Time Clock/Calendar with battery-backed RAM. It keeps time (seconds through year) and can run in 12/24‑hour formats, with alarm features. A 32.768 kHz crystal provides accurate timekeeping, and the device supports VBAT backup so time and on‑chip SRAM are retained during power loss. It offers on‑chip SRAM that is accessible over I2C for data logging or time stamping, in addition to the RTC registers. It uses a standard I2C two‑wire interface (up to fast mode) and provides configuration/status registers. The -I/SN suffix indicates industrial temperature range (-40°C to 85°C) and RoHS‑compliant packaging. Suitable for embedded systems needing persistent timekeeping and small amount of backup data storage.

Features

MCP79412-I/SN features (concise):
- I2C/2-wire serial interface (standard/fast mode up to 400 kHz)
- Real-Time Clock/Calendar with 32.768 kHz crystal input; 12/24-hour formats; leap-year aware; year 00–99
- VBAT battery-backup operation with automatic switchover (timekeeping preserved on power loss)
- Battery-backed non-volatile RAM for user data (NV SRAM accessible in VDD or VBAT mode)
- Two programmable alarms (Alarm 1 and Alarm 2) with multiple match options
- Programmable square-wave/interrupt output (frequency selectable)
- Interrupt output for alarms/timers
- Power-fail detect and seamless VBAT switch
- Low-power operation; suitable for battery-backed applications
- Wide supply range: typically 2.0–5.5 V; industrial temperature range (-40°C to +85°C)
- Package options: 8-pin package (SOIC/SOP, etc.); -I/SN indicates RoHS-compliant Industrial-grade
Note: Exact RAM size and alarm/square-wave details vary by variant; refer to datasheet for precise RAM length and feature set.

Package

MCP79412‑I/SN is supplied in an 8‑lead SOIC surface‑mount package (Microchip package code "SN" — 8‑pin SOIC, ~150 mil body), industrial temperature grade.

Pinout

The MCP79412‑I/SN is an 8‑pin RTC/EEPROM device. Typical pin functions are:
- VDD – main supply voltage
- VSS – ground
- SDA – I²C data (serial data)
- SCL – I²C clock (serial clock)
- VBAT – backup battery input (backup power for timekeeping)
- SQW/INT (or CLKOUT) – programmable square‑wave/interrupt/time‑pulse output
- GP0 – general‑purpose I/O (programmable)
- GP1 – general‑purpose I/O (programmable)
(Available in standard 8‑pin packages such as PDIP, SOIC, MSOP; consult the datasheet for exact pin numbering and alternative signal names.)

Manufacturer

Manufacturer: Microchip Technology Inc.
What kind of company: A multinational American semiconductor company that designs, develops, manufactures, and markets embedded controllers (like microcontrollers), memory, and analog/interface ICs, including RCs and related ICs such as the MCP79412.

Application

Applications: any embedded system needing reliable timekeeping with non-volatile storage. Use for data logging and time-stamping, event scheduling, and preserving calibration/config data during power loss. Suitable for data loggers, metering, portable instruments, medical devices, consumer electronics, and automotive/industrial controllers. With battery backup and an I2C interface, it enables low-power operation and continuous timekeeping when main power is off.

Equivalent

Equivalent I2C RTC/calendar ICs to the Microchip MCP79412 include: Maxim (Analog Devices) DS1307, DS1337, DS3231 (temp‑compensated, higher accuracy), NXP PCF8523, and Epson RX-8025/RX-8035. Note: feature sets (backup RAM, accuracy, voltage range, register map and pinout) vary—verify compatibility before substituting.