MCP795W22中文资料Enhanced Feature Battery-Backed SPI Real-Time Clock/Calendar with Pre-Programmed EUI-64™ MAC ID数据手册Microchip规格书

描述 Description

The MCP795W22 SPI RTCC is highly integrated with memory and advanced features normally found in higher priced devices. By starting with a basic real-time clock, digital trimming was added for higher accuracy, a battery switchover for backup power, a timestamp to log power failures and three types of memory, which includes SRAM, EEPROM and a unique ID in a locked section of EEPROM. This ID is preprogrammed with a 64-bit MAC Address, but it can also be ordered blank for the end user to program. By adding a watchdog timer and two programmable event detect inputs, lower power and more system robustness can be achieved by performaing these functions in the RTCC and allowing the MCU to sleep for longer periods of time.

特性 Features

VCC Min = 1.8V
Icc VBAT Min = 1.3V
Ibat Typical Timekeeping & SRAM Retention Current
VCC to VBAT (VCC Lost)
VBAT to VCC (VCC Restored)
IRQ (VCC or VBAT)
WDO (VCC)
Clock Out frequencies: 32.768, 8.192 & 4.096 KHz and 1 Hz
Adjusts up to 22 seconds/day
SPI Bus or EVHS digital input
High speed with programmable pulse count (EVHS)
Low speed with programmable debounce delay (EVLS)
Protect: None, 1/4, 1/2 or all of array
Factory standard MAC address programming or custom ID available