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PCF2127T/2Y Datasheet(PDF) 62 Page - NXP Semiconductors

Part # PCF2127T/2Y
Description  Accurate RTC with integrated quartz crystal for industrial applications
PDF  100 Pages
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Manufacturer  PHILIPS [NXP Semiconductors]
Direct Link  http://www.nxp.com
Logo PHILIPS - NXP Semiconductors

PCF2127T/2Y Datasheet(HTML) 62 Page - NXP Semiconductors

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PCF2127
All information provided in this document is subject to legal disclaimers.
© NXP Semiconductors N.V. 2014. All rights reserved.
Product data sheet
Rev. 8 — 19 December 2014
62 of 100
NXP Semiconductors
PCF2127
Accurate RTC with integrated quartz crystal for industrial applications
9.
Interfaces
The PCF2127 has an I2C-bus or SPI-bus interface using the same pins. The selection is
done using the interface selection pin IFS (see Table 85).
9.1 SPI-bus interface
Data transfer to and from the device is made by a 3 line SPI-bus (see Table 86). 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 36). The SPI-bus is initialized
whenever the chip enable line pin SDA/CE is inactive.
Table 85.
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 35. Interface selection
Fig 36. SDI, SDO configurations



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