PCA2129 datasheet(5/84 Pages) NXP

5 / 84 page

PCA2129

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Product data sheet

Rev. 5 — 19 December 2014

5 of 84

NXP Semiconductors

PCA2129

Automotive accurate RTC with integrated quartz crystal

7.2 Pin description

Table 4.

Pin description of PCA2129

Input or input/output pins must always be at a defined level (VSS or VDD) unless otherwise specified.

Symbol

Description

SCL

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

SDI

serial data input for SPI-bus

connect to pin VSS if I2C-bus is selected

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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