MCP79521 datasheet(2/58 Pages) MICROCHIP

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MCP7951X/MCP7952X

DS20002300D-page 2

 2012-2022 Microchip Technology Inc.and its subsidiaries

Description

The MCP795XX Real-Time Clock/Calendar (RTCC)

tracks time using internal counters for hours, minutes,

seconds, hundredth of seconds, days, months, years

and day of week. Alarms can be configured on all

counters up to and including months. For usage and

configuration,

the

MCP795XX

supports

SPI

communications up to 5 MHz.

The MCP795XX is designed to operate using a

32.768 kHz tuning fork crystal with external crystal

load capacitors. On-chip digital trimming can be used

to adjust for frequency variance caused by crystal

tolerance and temperature.

SRAM and timekeeping circuitry are powered from the

backup supply when main power is lost, allowing the

device to maintain accurate time and the SRAM

contents. The times when the device switches over to

the backup supply and when primary power returns

are both logged by the power-fail timestamp.

The MCP795XX features 128 bits of EEPROM which

is only writable after an unlock sequence, making it

ideal for storing a unique ID or other critical

information. The MCP795X1 and MCP795X2 are

preprogrammed with EUI-48 and EUI-64 addresses,

respectively. Custom programming is also available.

The MCP795XX has a shared pin for outputting a

selectable frequency square wave or alarm signals.

FIGURE 1-1:

TYPICAL APPLICATION SCHEMATIC

VCC

VBAT

CX1

CX2

VBAT

SCK

VSS

VCC

PIC® MCU

MCP795XX

MFP

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