M41T66数据手册集成电路（IC）的实时时钟规格书PDF

描述 Description

The M41T66 is a low-power serial real-time clock (RTC) with a built-in 32.768 kHz oscillator (external crystal controlled). Eight registers are used for the clock/calendar function and are configured in binary coded decimal (BCD) format. An additional 8 registers provide status/control of alarm, square wave, calibration, and watchdog functions. Addresses and data are transferred serially via a two line, bidirectional I2C interface. The built-in address register is incremented automatically after each WRITE or READ data byte.
Functions available to the user include a time-of-day clock/calendar, alarm interrupts, programmable square wave output, and watchdog output. The eight clock address locations contain the century, year, month, date, day, hour, minute, second and tenths/hundredths of a second in 24-hour BCD format. Corrections for 28-, 29- (leap year), 30- and 31-day months are made automatically.
The M41T66 is supplied in a 16-pin QFN.

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 and high crystal series resistance operation
• Oscillator stop detection monitors clock operation
• Serial interface supports I2C bus (400 kHz)
• 525 nA timekeeping current at 3 V
• Low operating current of 35 μA (at 400 kHz)
• Timekeeping down to 1.0 V
• 1.3 V to 4.4 V I2C bus operating voltage
• Allows use in lithium ion rechargeable applications
• 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 with interrupt function
• Accurate programmable watchdog (from 62.5 ms to 31 min)
• Software clock calibration to compensate deviation of crystal due to temperature
• Automatic leap year compensation
• Operating temperature of –40 to 85 °C
• Lead-free 16-pin QFN package

简介

M41T66属于集成电路（IC）的实时时钟。由制造生产的M41T66实时时钟实时时钟 (RTC) 为几乎所有需要保持精确时间的电子设备提供时间和/或日期信息。时钟类型有二进制计数器、时钟/日历/监控器、历时计时器、幻时钟芯片、便携式系统控制器、温度记录器、时间事件记录器和计时器时钟外设。其包含 2 B 至 2 MB 不等的存储器，接口选项有 I2C、并行、串行、SPI、1 线式、2 线式、3 线式和 4 线式。