PCF2129AT NXP [NXP Semiconductors], PCF2129AT Datasheet - Page 44

• Manufacturer Part Number: PCF2129AT
• Description: Integrated RTC, TCXO and quartz crystal
• Manufacturer: NXP [NXP Semiconductors]

NXP Semiconductors
9. Interfaces
PCF2129A_1
Product data sheet
Fig 26. Interface selection
a. SPI-bus interface selection
SDO
SCL
V
V
SDI
CE
DD
SS
To select the SPI-bus interface, pin IFS has to be
connected to pin V
SDA/CE
The PCF2129A has a selectable I
the interface selection pin IFS (see
Table 47.
Pin
IFS
SDO
SCL
V
SS
SDI
IFS
SS
.
1
2
3
4
5
6
7
8
9
10
PCF2129A
Connection
V
BBS
SS
Interface selection input pin IFS
20
19
18
17
16
15
14
13
12
11
V
BBS
001aaj706
DD
Rev. 01 — 13 January 2010
2
Bus interface
SPI-bus
I
C-bus or SPI-bus interface. The selection is done using
2
C-bus
Table
b. I
SDA
SCL
V
V
47).
DD
SS
To select the I
connected to pin BBS.
2
C-bus interface selection
Integrated RTC, TCXO and quartz crystal
R PU
2
C-bus interface pin IFS has to be
R PU
SDA/CE
SDO
SCL
V
SDI
IFS
SS
Reference
Section 9.1
Section 9.2
1
2
3
4
5
6
7
8
9
10
PCF2129A
PCF2129A
© NXP B.V. 2010. All rights reserved.
20
19
18
17
16
15
14
13
12
11
BBS
V
001aaj707
DD
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