DS1691数据手册集成电路（IC）的实时时钟规格书PDF

描述 Description

The DS1688/DS1691 is a real-time clock (RTC) designed as a successor to the industry standard DS1285, DS1385, DS1485, and DS1585 PC real time clocks. This device provides the industry standard DS1285 clock function with the new feature of either +3.0 or +5.0V operation and automatic backup and write protection to an external SRAM. The DS1688 also incorporates a number of enhanced features including a silicon serial number, power on/off control circuitry, 114 bytes of user NV SRAM, power on elapsed timer, and power cycle counter.

特性 Features

Incorporates industry standard DS1287 PC clock plus enhanced features:
• +3 or +5V operation
• 64-bit Silicon serial number
• 64-bit customer specific ROM or additional serial number available
• Power control circuitry supports system power on from date/time alarm or key closure
• Automatic battery backup and write protection to external SRAM
• Crystal select bit allows RTC to operate with
• 6pF or 12.5pF crystal
• 114 bytes user NV RAM
• Auxiliary battery input
• RAM clear input
• Century register
• 32kHz output for power management
• 32-bit VCC powered elapsed time counter
• 32-bit VBAT powered elapsed time counter
• 16-bit power cycle counter
• Compatible with existing BIOS for original DS1287 functions
• Available as IC (DS1688) or stand-alone module with embedded battery and crystal (DS1691)
• Timekeeping algorithm includes leap year compensation valid up to 2100

简介

DS1691属于集成电路（IC）的实时时钟。由制造生产的DS1691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。