MCP7952X datasheet(2/50 Pages) MAS

2 / 50 page

MCP7952X/MCP7951X

DS22300A-page 2

Preliminary

 2012 Microchip Technology Inc.

Description:

The MCP795XX is a low-power Real-Time Clock/

Calendar (RTCC) that uses digital trimming compen-

sation for an accurate clock/calendar, an interrupt out-

put to support alarms and events, a power sense

circuit that automatically switches to the backup sup-

ply, nonvolatile memory for safe data storage and sev-

eral

enhanced

features

that

support

system

requirements.

Along with a low-cost 32,768 kHz crystal, this RTCC

tracks time using several internal registers and then

communicates the data over a 5 MHz SPI bus that is

fast enough to support a programmable millisecond

alarm.

The device is fully accessible through the serial inter-

face, while VCC is between 1.8V and 3.6V, but can

operate down to 1.3V through the backup supply con-

nected to the VBAT input for timekeeping and SRAM

retention only.

As part of the power sense circuit, a time saver

function is implemented to store the time when main

power is lost and again, when power is restored to log

the duration of a power failure.

Along with the on-board serial EEPROM and battery-

backed SRAM, a 128-bit protected space is available

for a unique ID. This space can be ordered

preprogrammed with a MAC address, or blank for the

user to program.

This clock/calendar automatically adjusts for months

with fewer than 31 days including corrections for leap

years. The clock operates in either 24-hour or 12-hour

format with AM/PM indicator and settable alarm(s).

Using the external crystal, the MFP pin can be set to

generate a number of output frequencies.

FIGURE 1-1:

BLOCK DIAGRAM

VBAT

VSS

VCC

MFP

SCK

OSC

CLKOUT Divider

SPI

EEPROM

SRAM

TIME-STAMP

MCP7952X Datasheet(PDF) 2 Page - Micro Analog systems

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