pcf2127a NXP Semiconductors, pcf2127a Datasheet - Page 53

• Manufacturer Part Number: pcf2127a
• Description: Integrated Rtc, Tcxo And Quartz Crystal
• Manufacturer: NXP Semiconductors

NXP Semiconductors
9. Interfaces
PCF2127A_1
Product data sheet
Fig 33. Interface selection
a. SPI-bus interface selection
SDO
V
SCL
V
SDI
CE
DD
SS
To select the SPI-bus interface, pin IFS has to be
connected to pin V
SDA/CE
The PCF2127A has a selectable I
the interface selection pin IFS (see
Table 56.
SDO
Pin
IFS
SCL
V
SDI
IFS
SS
SS
.
1
2
3
4
5
6
7
8
9
10
PCF2127A
Connection
V
BBS
SS
Interface selection input pin IFS
20
19
18
17
16
15
14
13
12
11
V
BBS
001aaj679
DD
Rev. 01 — 21 January 2010
2
Bus interface
SPI-bus
I
C-bus or SPI-bus interface. The selection is done using
2
C-bus
Table
SDA
b. I
SCL
V
V
DD
SS
56).
To select the I
connected to pin BBS.
2
C-bus interface selection
Integrated RTC, TCXO and quartz crystal
R PU
2
SDA/CE
R PU
C-bus interface pin IFS has to be
SDO
SCL
V
SDI
IFS
SS
1
2
3
4
5
6
7
8
9
10
Reference
Section 9.1
Section 9.2
PCF2127A
PCF2127A
© NXP B.V. 2010. All rights reserved.
20
19
18
17
16
15
14
13
12
11
BBS
V
001aaj680
DD
53 of 79