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PCF8564A Datasheet(PDF) 52 Page - NXP Semiconductors

Part # PCF8564A
Description  Nano-power highly accurate RTC with integrated quartz crystal for automotive applications
PDF  86 Pages
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Manufacturer  NXP [NXP Semiconductors]
Direct Link  http://www.nxp.com
Logo NXP - NXP Semiconductors

PCF8564A Datasheet(HTML) 52 Page - NXP Semiconductors

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NXP Semiconductors
PCA2131
Nano-power highly accurate RTC with integrated quartz crystal for automotive applications
7.16 Interfaces
The PCA2131 has an I2C-bus or SPI-bus interface using the same pins. The selection is
done using the interface selection pin IFS (see Table 84).
Pin
Connection
Bus interface
Reference
VSS
SPI-bus
Section 7.16.1
IFS
VDD
I2C-bus
Section 7.16.2
Table 84. Interface selection input pin IFS
aaa-041576
BBS
SCL
CE
PCA2131
SDI
SDO
SDA/CE
IFS
SDO
SDI
SCL
VDD
VDD
VSS
VSS
To select the SPI-bus interface, pin IFS has to be connected
to pin VSS.
a. SPI-bus interface selection
aaa-041577
BBS
SCL
PCA2131
SDI
SDO
SDA/CE
IFS
SCL
SDA
VDD
VDD
VSS
VSS
RPU
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
PCA2131
All information provided in this document is subject to legal disclaimers.
© NXP B.V. 2021. All rights reserved.
Product data sheet
Rev. 1.0 — 26 July 2021
52 / 86



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