PCF2129AT/1,512 NXP Semiconductors, PCF2129AT/1,512 Datasheet - Page 50

• Manufacturer Part Number: PCF2129AT/1,512
• Description: IC REAL TIME CLK/CALENDAR 20SOIC
• Manufacturer: NXP Semiconductors
• Type: Clock/Calendar/Alarmr

Specifications of PCF2129AT/1,512

• Package / Case: 20-SOIC (7.5mm Width)
• Date Format: YY-MM-DD-dd
• Time Format: HH:MM:SS (12/24 hr)
• Interface: I²C, SPI
• Voltage - Supply: 1.8 V ~ 4.2 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Function: Clock, Alarm, Watchdog, Timestamp
• Supply Voltage (max): 4.2 V
• Supply Voltage (min): 1.8 V
• Maximum Operating Temperature: + 85 C
• Minimum Operating Temperature: - 40 C
• Mounting Style: SMD/SMT
• Rtc Bus Interface: I2C, SPI
• Supply Current: 800 uA
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Memory Size: -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant
• Other names: 568-4960-5; 935288599512

NXP Semiconductors
PCF2129A_2
Product data sheet
Fig 36. Bus protocol, reading from registers
S
S
1
1
0
0
slave address
slave address
1
1
Table 50.
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 PCF2129A
from PCF2129A
All information provided in this document is subject to legal disclaimers.
acknowledge
acknowledge
0
1
0
6
0
(Table
A
A
0
Rev. 02 — 7 May 2010
0
0 to n data bytes
register address
55). In the write mode a data transfer is terminated by sending
DATA BYTE
00h to 1Dh
1
2
write bit
5
1
from PCF2129A
C-bus specification
acknowledge
0
A
from PCF2129A
acknowledge
acknowledge
from master
4
0
register address
A
A
00h to 1Dh
STOP
Integrated RTC, TCXO and quartz crystal
P
LAST DATA BYTE
3
0
Ref. 13 “UM10204”
from PCF2129A
acknowledge
A
no acknowledge
2
0
A
data bytes
0 to n
PCF2129A
P
1
1
and the
© NXP B.V. 2010. All rights reserved.
read register
data
set register
address
from PCF2129A
acknowledge
001aaj724
A
0
LSB
R/W
START/
STOP
001aaj723
P/S
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