LV8572A中文资料Low Voltage Real Time Clock (RTC)数据手册TI规格书

描述 Description

General Description
The LV8572A is intended for use in microprocessor based systems where information is required for multi-tasking, data logging or general time of day/date information. This device is implemented in low voltage silicon gate microCMOS technology to provide low standby power in battery back-up environments. The circuit’s architecture is such that it looks like a contiguous block of memory or I/O ports. The address space is organized as 2 software selectable pages of 32 bytes. This includes the Control Registers, the Clock Counters, the Alarm Compare RAM, and the Time Save RAM. Any of the RAM locations that are not being used for their intended purpose may be used as general purpose CMOS RAM.

特性 Features

■ 3.3V g10% supply
■ Full function real time clock/calendar
   - 12/24 hour mode timekeeping
   - Day of week and day of years counters
   - Four selectable oscillator frequencies
   - Parallel resonant oscillator
■ Power fail features
   - Internal power supply switch to external battery
   - Power Supply Bus glitch protection
   - Automatic log of time into RAM at power failure
■ On-chip interrupt structure
   - Periodic, alarm, and power fail interrupts
■ Up to 44 bytes of CMOS RAM