MCP7940N中文资料Battery-Backed I2C Real-Time Clock/Calendar with SRAM数据手册Microchip规格书

描述 Description

The MCP7940N series of low-power Real-Time Clocks (RTC) uses digital timing compensation for an accurate clock/calendar, a programmable output control for versatility, and a power sense circuit that automatically switches to the backup supply. Using a low-cost 32.768kHz crystal, it tracks time using several internal registers.For communication, the MCP7940N uses the I2C™ bus. The clock/calendar automatically adjusts for months with fewer than 31 days, including corrections for leap years. The clock operates in either the 24-hour or 12-hour format with an AM/PM indicator and settable alarm(s) to the second, minute, hour, day of the week, date or month. Using the programmable CLKOUT, frequencies of 32.768, 8.192 and 4.096kHz and 1 Hz can be generated from the external crystal.The device is fully accessible through the serial interface while VCC is between 1.8V and 5.5V, but can operate down to 1.3V for timekeeping and SRAM retention only.

特性 Features

Battery-Backed Real-Time Clock/Calendar (RTCC)
Hours, Minutes, Seconds, Day of Week, Day, Month, Year
Leap year compensated  to 2399
12/24 hour modes
On-Chip Digital Trimming/Calibration
1 PPM Resolution
±129 PPM Range
Dual Programmable Alarms
Versatile Output Pin
Clock output with selectable frequency
Alarm output
General Purpose output
Time logged on switchover to and from Battery Backup
64 Bytes Battery-Backed SRAM
I2C Clock Frequency up to 400 kHz
Operating Voltage 1.8V to 5.5V
Backup Voltage 1.3V to 5.5V
Low Typical Timekeeping Current
Automatic Switchover to Battery Backup

简介

MCP7940N属于集成电路（IC）的实时时钟。由制造生产的MCP7940N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。