PCF2129AT/2,518 NXP Semiconductors, PCF2129AT/2,518 Datasheet - Page 45

• Manufacturer Part Number: PCF2129AT/2,518
• Description: Real Time Clock
• Manufacturer: NXP Semiconductors
• Series: PCF2129r

Specifications of PCF2129AT/2,518

• Rohs: yes
• Function: Clock, Calendar, Alarm, Watchdog, Timestamp
• Rtc Bus Interface: I2C, SPI
• Date Format: Binary
• Time Format: Binary
• Supply Voltage - Max: 4.2 V
• Supply Voltage - Min: 1.2 V
• Maximum Operating Temperature: + 60 C
• Minimum Operating Temperature: - 15 C
• Mounting Style: SMD/SMT
• Package / Case: SOP-20
• Battery Backup Switching: Yes
• Factory Pack Quantity: 2000

NXP Semiconductors
9. Interfaces
PCF2129AT
Product data sheet
Fig 26. 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
SDO
SCL
The PCF2129AT has an I
is done using the interface selection pin IFS (see
Table 48.
V
SDI
Pin
IFS
IFS
SS
SS
.
1
2
3
4
5
6
7
8
9
10
PCF2129AT
Connection
BBS
V
SS
Interface selection input pin IFS
All information provided in this document is subject to legal disclaimers.
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V
BBS
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Rev. 5 — 12 February 2013
2
C-bus or SPI-bus interface using the same pins. The selection
Bus interface
SPI-bus
I
2
C-bus
b. I
SDA
V
SCL
V
DD
SS
To select the I
connected to pin BBS.
2
C-bus interface selection
Integrated RTC, TCXO and quartz crystal
R PU
Table
2
SDA/CE
R PU
C-bus interface, pin IFS has to be
48).
SDO
SCL
V
SDI
IFS
SS
1
2
3
4
5
6
7
8
9
10
Reference
Section 9.1
Section 9.2
PCF2129AT
PCF2129AT
© NXP B.V. 2013. All rights reserved.
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