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PCF2129 Fiches technique(PDF) 51 Page - NXP Semiconductors

No de pièce PCF2129
Description  Accurate RTC with integrated quartz crystal for industrial applications
PDF  86 Pages
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Fabricant  PHILIPS [NXP Semiconductors]
Site Internet  http://www.nxp.com
Logo PHILIPS - NXP Semiconductors

PCF2129 Fiches technique(HTML) 51 Page - NXP Semiconductors

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PCF2129
All information provided in this document is subject to legal disclaimers.
© NXP Semiconductors N.V. 2014. All rights reserved.
Product data sheet
Rev. 7 — 19 December 2014
51 of 86
NXP Semiconductors
PCF2129
Accurate RTC with integrated quartz crystal for industrial applications
9.
Interfaces
The PCF2129 has an I2C-bus or SPI-bus interface using the same pins. The selection is
done using the interface selection pin IFS (see Table 74).
9.1 SPI-bus interface
Data transfer to and from the device is made by a 3 line SPI-bus (see Table 75). The data
lines for input and output are split. The data input and output line can be connected
together to facilitate a bidirectional data bus (see Figure 29). The SPI-bus is initialized
whenever the chip enable line pin SDA/CE is inactive.
Table 74.
Interface selection input pin IFS
Pin
Connection
Bus interface
Reference
IFS
VSS
SPI-bus
Section 9.1
BBS
I2C-bus
Section 9.2
To select the SPI-bus interface, pin IFS has to be
connected to pin VSS.
To select the I2C-bus interface, pin IFS has to be
connected to pin BBS.
a. SPI-bus interface selection
b. I2C-bus interface selection
Fig 28. Interface selection
Fig 29. SDI, SDO configurations



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