PCA2129T/Q900/2,51 NXP Semiconductors, PCA2129T/Q900/2,51 Datasheet - Page 50

• Manufacturer Part Number: PCA2129T/Q900/2,51
• Description: Real Time Clock
• Manufacturer: NXP Semiconductors
• Series: PCA2129r

Specifications of PCA2129T/Q900/2,51

• 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: 1.8 V
• Maximum Operating Temperature: + 80 C
• Minimum Operating Temperature: - 30 C
• Mounting Style: SMD/SMT
• Package / Case: SOP-16
• Battery Backup Switching: Yes

NXP Semiconductors
PCA2129T
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
All information provided in this document is subject to legal disclaimers.
from PCA2129T
from PCA2129T
acknowledge
acknowledge
0
1
0
6
0
(Table
A
A
0
Rev. 3 — 24 January 2013
0
Accurate RTC with integrated quartz crystal for automotive
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
5
1
C-bus specification
from PCA2129T
acknowledge
0
A
from PCA2129T
acknowledge
acknowledge
from master
4
0
register address
A
A
00h to 1Bh
STOP
P
LAST DATA BYTE
3
0
Ref. 11 “UM10204”
from PCA2129T
acknowledge
A
no acknowledge
2
0
A
data bytes
0 to n
PCA2129T
P
1
1
and the
© NXP B.V. 2013. All rights reserved.
read register
data
set register
address
from PCA2129T
013aaa130
acknowledge
A
0
LSB
R/W
START/
013aaa129
STOP
P/S
50 of 72