MCP7940M中文资料I2C Real-Time Clock/Calendar with SRAM数据手册Microchip规格书

描述 Description

The MCP7940M I2CTM compatible real-time clock/calendar (RTCC) includes SRAM and a digital trimming circuit for accuracy which is normally found in higher priced devices. Using a low-cost 32,768 kHz crystal or other clock source, time is tracked in either a 12-hour or 24-hour format with an AM/PM indicator and timing to the second, minute, hour, day of the week, day, month and year. As an interrupt or wakeup signal, a multifunction open drain output can be programmed as an Alarm Out or as a Clock Out that supports 4 selectable frequencies.

特性 Features

Hours, Minutes, Seconds, Day of Week, Day, Month, Year
Leap year compensated  to 2399
12/24 hour modes
1 PPM Resolution
±129 PPM Range
Dual Programmable Alarms
Clock output with selectable frequency
Alarm output
General Purpose output
64 Bytes SRAM
I2C Clock Frequency up to 400 kHz
Operating Voltage 1.8V to 5.5V
Low Typical Timekeeping Current

简介

MCP7940M属于集成电路（IC）的实时时钟。由制造生产的MCP7940M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。