M41T80M屬于集成電路（IC）的實時時鐘。由意法半導體集團制造生產(chǎn)的M41T80M實時時鐘實時時鐘 (RTC) 為幾乎所有需要保持精確時間的電子設備提供時間和/或日期信息。時鐘類型有二進制計數(shù)器、時鐘/日歷/監(jiān)控器、歷時計時器、幻時鐘芯片、便攜式系統(tǒng)控制器、溫度記錄器、時間事件記錄器和計時器時鐘外設。其包含 2 B 至 2 MB 不等的存儲器，接口選項有 I2C、并行、串行、SPI、1 線式、2 線式、3 線式和 4 線式。

描述 Description

The M41T80 is a low power serial RTC with a built-in 32.768 kHz oscillator (external crystal controlled). Eight registers (see Table 3: Clock register map on page 14) are used for the clock/calendar function and are configured in binary coded decimal (BCD) format. An additional 12 registers provide status/control of alarm, 32 KHz output, and square wave functions. Addresses and data are transferred serially via a two line, bi-directional I2C interface. The built-in address register is incremented automatically after each WRITE or READ data byte.

特性 Features

■ Counters for tenths/hundredths of seconds,

seconds, minutes, hours, day, date, month,

year, and century

■ 32 KHz crystal oscillator integrating load

capacitance (12.5 pF) providing exceptional

oscillator stability and high crystal series

resistance operation

■ Serial interface supports I2C bus (400 kHz)

■ 2.0 to 5.5 V clock operating voltage

■ 32 KHz square wave on power-up to drive a

microcontroller in low-power mode

■ Programmable (1 Hz to 32 KHz) square wave

■ Programmable alarm and interrupt function

■ Low operating current of 200 μA

■ Operating temperature of –40 to 85 °C

■ ECOPACK? package available