PCF2129 datasheet(5/86 Pages) PHILIPS

5 / 86 page

PCF2129

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Product data sheet

Rev. 7 — 19 December 2014

5 of 86

NXP Semiconductors

PCF2129

Accurate RTC with integrated quartz crystal for industrial applications

After lead forming and cutting, there remain stubs from the package assembly process.

These stubs are present at the edge of the package as illustrated in Figure 4. The stubs

are at an electrical potential. To avoid malfunction of the PCF2129, it has to be ensured

that they are not shorted with another electrical potential (e.g. by condensation).

7.2 Pin description

Table 4.

Pin description of PCF2129

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

Symbol

Description

PCF2129AT

PCF2129T

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 16

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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