PCF2127A datasheet(3/80 Pages) NXP

Part #	PCF2127A

Description	Integrated RTC, TCXO and quartz crystal

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Manufacturer	NXP [NXP Semiconductors]

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PCF2127A_2

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Product data sheet

Rev. 02 — 7 May 2010

3 of 80

NXP Semiconductors

PCF2127A

Integrated RTC, TCXO and quartz crystal

6.

Block diagram

Fig 1.

Block diagram of PCF2127A

001aaj675

TEST

PFO

SCL

SDO

TEMP

1.25 V

(internal)

SDI

VDD

BBS

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

SELECTOR

SPI-BUS

INTERFACE

I2C-BUS

INTERFACE

512 BYTES

STATIC RAM

TEMPERATURE

SENSOR

RESET

LOGIC

CONTROL

DIVIDER

AND

TIMER

ADDRESS

REGISTER

Control_1

Control_2

Control_3

00h

01h

02h

Seconds

03h

Minutes

04h

Hours

05h

Days

06h

Weekdays

07h

Months

08h

Years

09h

Second_alarm

0Ah

Minute_alarm

0Bh

Hour_alarm

0Ch

Day_alarm

0Dh

Weekday_alarm

0Eh

CLKOUT_ctl

0Fh

Watchdg_tim_ctl

10h

Watchdg_tim_val

11h

Timestp_ctl

12h

Sec_timestp

13h

Min_timestp

14h

Hour_timestp

15h

Day_timestp

16h

Mon_timestp

17h

Year_timestp

18h

Aging_offset

19h

RAM_addr_MSB

1Ah

RAM_addr_LSB

1Bh

RAM_wrt_cmd

1Ch

RAM_rd_cmd

1Dh

SDA/CE

IFS

PFI

TS

SDA/CE

PCF2127A

RPU

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