M41T01中文资料串行实时时钟（RTC），内置电池切换电路数据手册ST规格书

描述 Description

The M41T01 is a low-power serial real-time clock (RTC). The built-in 32.768 kHz oscillator circuit works with an external crystal and does not need any load capacitors.

The M41T01 clock has a built-in power sense circuit which detects power failures and automatically switches to the battery supply during power failures. Eight 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 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 5 years with a 50 mA/h 3 V lithium cell. The M41T01 is supplied in an 8-lead plastic small outline package.

特性 Features

• 2.0 to 5.5 V clock operating voltage
• Counters for seconds, minutes, hours, day, date, month, years, and century
• Software clock calibration
• Automatic switchover and deselect circuitry
• Ultra-low battery supply current of 800 nA
• Low operating current of 300 μA
• Battery and capacitor backup
• Battery backup not recommended for 3.0 V applications (capacitor backup only)
• Operating temperature of –40 to 85 °C
• Automatic leap year compensation

简介

M41T01属于集成电路（IC）的实时时钟。由制造生产的M41T01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。