PCF2129T datasheet(4/73 Pages) NXP

4 / 73 page

PCF2129T

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Product data sheet

Rev. 3 — 12 February 2013

4 of 73

NXP Semiconductors

PCF2129T

Accurate RTC with integrated quartz crystal for industrial

Pinning information

7.1 Pinning

7.2 Pin description

Top view. For mechanical details, see Figure 44.

Fig 2.

Pin configuration for PCF2129T (SO16)

PCF2129T

SCL

VDD

SDI

VBAT

SDO

BBS

SDA/CE

INT

IFS

n.c.

CLKOUT

n.c.

VSS

n.c.

013aaa567

Table 4.

Pin description of PCF2129T

Symbol

Description

SCL

combined serial clock input for both I2C-bus and SPI-bus; may

float when SDA/CE inactive

SDI

serial data input for SPI-bus; may float when SDA/CE inactive

SDO

serial data output for SPI-bus, push-pull

SDA/CE

combined serial data input and output for the I2C-bus and chip

enable input (active LOW) for the SPI-bus

IFS

interface selector input

connect to pin VSS to select the SPI-bus

connect to pin BBS to select the I2C-bus

timestamp input (active LOW) with 200 k

 internal pull-up resistor

(RPU)

CLKOUT

clock output (open-drain)

VSS

ground supply voltage

n.c.

9 to 12

not connected; do not connect; do not use as feed through

INT

interrupt output (open-drain; active LOW)

BBS

output voltage (battery backed)

VBAT

battery supply voltage (backup)

connect to VSS if battery switch over is not used

VDD

supply voltage

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