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PCF2129A Datasheet(PDF) 45 Page - NXP Semiconductors

Part # PCF2129A
Description  Integrated RTC, TCXO and quartz crystal
PDF  69 Pages
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Manufacturer  NXP [NXP Semiconductors]
Direct Link  http://www.nxp.com
Logo NXP - NXP Semiconductors

PCF2129A Datasheet(HTML) 45 Page - NXP Semiconductors

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PCF2129A_2
All information provided in this document is subject to legal disclaimers.
© NXP B.V. 2010. All rights reserved.
Product data sheet
Rev. 02 — 7 May 2010
45 of 69
NXP Semiconductors
PCF2129A
Integrated RTC, TCXO and quartz crystal
9.
Interfaces
The PCF2129A has a selectable I2C-bus or SPI-bus interface. The selection is done using
the interface selection pin IFS (see Table 47).
Table 47.
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 26. Interface selection
001aaj706
1
VDD
BBS
SCL
CE
20
PCF2129A
2
SDI
19
3
SDO
18
4
SDA/CE
17
5
IFS
16
615
714
8
VSS
13
912
10
11
SDO
SDI
SCL
VDD
VSS
001aaj707
1
VDD
BBS
SCL
20
PCF2129A
2
SDI
19
3
SDO
18
4
SDA/CE
17
5
IFS
16
615
714
8
VSS
VSS
13
SDA
SCL
RPU
RPU
VDD
912
10
11



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