PCF2129AT/2,518 NXP Semiconductors, PCF2129AT/2,518 Datasheet - Page 50

• 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
PCF2129AT
Product data sheet
Fig 36. Bus protocol, reading from registers
S
S
1
1
0
0
slave address
slave address
1
1
Table 51.
The R/W bit defines the direction of the following single or multiple byte data transfer (read
is logic 1, write is logic 0).
For the format and the timing of the START condition (S), the STOP condition (P), and the
acknowledge (A) refer to the I
characteristics table
either a STOP condition or the START condition of the next data transfer.
Bit
Fig 35. Bus protocol, writing to registers
0
0
S
0
0
1
0
0
Slave address
7
MSB
1
0
I
2
C slave address byte
slave address
1
1
1
write bit
read bit
from PCF2129AT
from PCF2129AT
All information provided in this document is subject to legal disclaimers.
acknowledge
acknowledge
0
1
0
6
0
(Table
A
A
0
Rev. 5 — 12 February 2013
0
0 to n data bytes
register address
56). In the write mode, a data transfer is terminated by sending
DATA BYTE
00h to 1Bh
1
2
write bit
from PCF2129AT
5
1
C-bus specification
acknowledge
0
A
from PCF2129AT
acknowledge
acknowledge
from master
4
0
register address
A
A
00h to 1Bh
STOP
Integrated RTC, TCXO and quartz crystal
P
LAST DATA BYTE
3
0
Ref. 11 “UM10204”
from PCF2129AT
acknowledge
A
no acknowledge
2
0
A
PCF2129AT
data bytes
0 to n
P
1
1
and the
© NXP B.V. 2013. All rights reserved.
read register
data
set register
address
from PCF2129AT
acknowledge
001aaj724
A
0
LSB
R/W
START/
STOP
001aaj723
P/S
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