PCF2131 datasheet(51/85 Pages) NXP

51 / 85 page

NXP Semiconductors

PCF2131

Nano-power highly accurate RTC with integrated quartz crystal

aaa-041887

BBS

SCL

PCF2131

SDI

SDO

SDA/CE

IFS

SDO

SDI

SCL

VDD

VSS

To select the SPI-bus interface, pin IFS has to be connected

to pin VSS.

a. SPI-bus interface selection

aaa-041886

BBS

SCL

PCF2131

SDI

SDO

SDA/CE

IFS

SCL

SDA

VDD

VSS

RPU

To select the I2C-bus interface, pin IFS has to be connected

to pin VDD.

b. I2C-bus interface selection

Figure 24. Interface selection

7.16.1 SPI-bus interface

Data transfer to and from the device is made by a 4-line SPI-bus (see Table 85). The data lines for input and

output are split. The SPI-bus is initialized whenever the chip enable line pin SDA/CE is inactive.

two-wire mode

SDO

SDI

aaa-041578

Figure 25. SDI, SDO configurations

Symbol

Function

Description

SDA/CE

chip enable input;

active LOW

[1] when HIGH, the interface is reset;

input may be higher than VDD

SCL

serial clock input

when SDA/CE is HIGH, input may float;

input may be higher than VDD

SDI

serial data input

when SDA/CE is HIGH, input may float;

input may be higher than VDD;

input data is sampled on the rising edge of SCL

SDO

serial data output

push-pull output;

drives from VSS to Voper(int) (VBBS);

output data is changed on the falling edge of SCL

Table 85. Serial interface

PCF2131

All information provided in this document is subject to legal disclaimers.

Product data sheet

Rev. 2.0 — 5 October 2023

51 / 85

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