M41T56数据手册集成电路（IC）的实时时钟规格书PDF

描述 Description

The M41T56 is a low-power, serial real-time clock (RTC) with 56 bytes of NVRAM. A built-in 32,768 Hz 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 50 mAh, 3 V lithium cell. The M41T56 is supplied in an 8-lead plastic SOIC package.

特性 Features

• Counters for seconds, minutes, hours, day, date, month, years, 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 (100 kHz protocol)
• Ultra-low battery supply current of 450 nA (typ at 3 V)
• 5 V ±10% supply voltage
• Timekeeping down to 2.5 V
• 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, 150-mil, plastic SOIC (SO8)
• RoHS compliant
•Lead-free second level interconnect

简介

M41T56属于集成电路（IC）的实时时钟。由制造生产的M41T56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。