PCF8564A datasheet(54/86 Pages) NXP

54 / 86 page

NXP Semiconductors

PCA2131

Nano-power highly accurate RTC with integrated quartz crystal for automotive applications

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seconds data 45BCD

minutes data 10BCD

addr 07h

R/W

SCL

SDI

SDA/CE

address

counter

In this example, the Seconds register is set to 45 seconds and the Minutes register to 10 minutes.

Figure 27. SPI-bus write example

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months data 11BCD

years data 06BCD

addr 0Ch

R/W

SCL

SDI

SDA/CE

address

counter

SDO

In this example, the registers Months and Years are read. The pins SDI and SDO are not connected together. For this

configuration, it is important that pin SDI is never left floating. It must always be driven either HIGH or LOW. If pin SDI is

left open, high IDD currents may result.

Figure 28. SPI-bus read example

7.16.2 I2C-bus interface

The I2C-bus is for bidirectional, two-line communication between different ICs or

modules. The two lines are a Serial DAta line (SDA) and a Serial CLock line (SCL). Both

lines are connected to a positive supply by a pull-up resistor. Data transfer is initiated

only when the bus is not busy.

7.16.2.1 Bit transfer

One data bit is transferred during each clock pulse. The data on the SDA line remains

stable during the HIGH period of the clock pulse as changes in the data line at this time

are interpreted as control signals (see Figure 29).

PCA2131

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

Product data sheet

Rev. 1.0 — 26 July 2021

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