PCF2128T datasheet(3/10 Pages) PHILIPS

3 / 10 page

PCF2128_SDS_0

Preliminary [short] data sheet

Rev. 00.03 — 4 June 2007

3 of 10

NXP Semiconductors

PCF2128

Real time clock / calendar

Block diagram

Fig 1.

Block diagram of PCF2128

001aag059_02

TEST

PFO

SCL

SDO

TEMP

1.25 V

(internal)

SDI

VDD

VOUT

VBAT

VSS

internal

power

supply

RST

SDI

SDO

CLKOUT

INT

OSCI

OSCO

TEMP

1 Hz

32.768 kHz

TCXO

BATTERY BACK UP

SWITCH-OVER

CIRCUITRY

OSCILLATOR

MONITOR

SERIAL BUS

INTERFACE

SELECTORS

I2C BUS

INTERFACE

512 BYTES

STATIC RAM

TEMPERATURE

SENSOR

RESET

LOGIC

CONTROL

DIVIDER

AND

TIMER

ADDRESS

CONTROL 1

CONTROL 2

CONTROL 3

SECONDS

MINUTES

HOURS

DAYS

WEEKDAYS

MONTHS

YEARS

SECOND ALARM

MINUTE ALARM

HOUR ALARM

DAY ALARM

WEEKDAY ALARM

CLOCKOUT CONTROL

TIMER CONTROL

COUNTDOWN TIMER

SECOND TIMESTAMP

MINUTE TIMESTAMP

HOUR TIMESTAMP

DAY TIMESTAMP

MONTH TIMESTAMP

YEAR TIMESTAMP

CRYSTAL AGING OFFSET

RAM ADDRESS MSB

RAM ADDRESS LSB

RAM WRITE

RAM READ

SDA/CE

IFS

PFI

SDA/CE

1/16 SECOND TIMESTAMP

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