M41T56集成電路（IC）的實時時鐘規(guī)格書PDF中文資料

M41T56屬于集成電路（IC）的實時時鐘。由意法半導(dǎo)體集團制造生產(chǎn)的M41T56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(shè)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(shè)。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。

Description

The M41T56 is a low power, serial real-time clock with 56 bytes of NVRAM. A built-in 32,768Hz oscillator (external crystal controlled) and the first 8 bytes of the RAM are used for the clock/calendar function and are configured in binary coded decimal (BCD) format. Addresses and data are transferred serially via a two-line, bidirectional bus. The built-in address register is incremented automatically after each WRITE or READ data byte.

The M41T56 clock has a built-in power sense circuit which detects power failures and automatically switches to the battery supply during power failures. The energy needed to sustain the RAM and clock operations can be supplied from a small lithium coin cell.

Typical data retention time is in excess of 10 years with a 50mAh, 3V lithium cell. The M41T56 is supplied in an 8-lead plastic SOIC package.

Features

■ Counters for seconds, minutes, hours, day, date, month, years, and century

■ 32KHz crystal oscillator integrating load capacitance (12.5pF) providing exceptional oscillator stability and high crystal series resistance operation

■ Serial interface supports I2C bus (100kHz protocol)

■ Ultra-low battery supply current of 450nA (typ at 3V)

■ 5V ±10 supply voltage

■ Timekeeping down to 2.5V

■ Automatic power-fail detect and switch circuitry

■ 56 bytes of general purpose RAM

■ Software clock calibration to compensate crystal deviation due to temperature

■ Automatic leap year compensation

■ Operating temperature of –40°C to 85°C

■ Available in an 8-lead, 150mil, plastic SOIC (SO8)

■ RoHS compliant

– Lead-free second level interconnect