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PCA9557DB Datasheet(PDF) 10 Page - Texas Instruments

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Part # PCA9557DB
Description  REMOTE 8-BIT I2C AND SMBus LOW-POWER I/O EXPANDER WITH RESET AND CONFIGURATION REGISTERS
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Manufacturer  TI [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI - Texas Instruments

PCA9557DB Datasheet(HTML) 10 Page - Texas Instruments

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Reads
A2
0
0
S
1
1
A1 A0 0
A
A
Data from Register
Slave Address
Slave Address
R/W
ACK From
Slave
Command Byte
S
A2
0
0
1
1
A1 A0
R/W
1 A
Data
A
Data
Data from Register
NA P
Last Byte
At this moment, master-transmitter
becomes master-receiver, and
slave-receiver becomes
slave-transmitter
ACK From
Slave
ACK From
Slave
ACK From
Master
NACK From
Master
First Byte
SCL
SDA
Start
Condition
R/W
Read From
Port
Data Into
Port
Stop
Condition
ACK From
Master
NACK From
Master
ACK From
Slave
Data From Port
Slave Address
Data From Port
1
9
8
7
6
5
4
3
2
A2
0
0
S
1
1
A1 A0 1
A
Data 1
Data 4
A
NA P
Data 2
Data 3
Data 4
tph
tps
Data 5
PCA9557
SCPS133I – DECEMBER 2005 – REVISED JUNE 2008.................................................................................................................................................... www.ti.com
The bus master first must send the PCA9557 address with the LSB set to a logic 0 (see Figure 4 for device
address). The command byte is sent after the address and determines which register is accessed. After a restart,
the device address is sent again but, this time, the LSB is set to a logic 1. Data from the register defined by the
command byte then is sent by the PCA9557 (see Figure 8 and Figure 9). After a restart, the value of the register
defined by the command byte matches the register being accessed when the restart occurred. Data is clocked
into the register on the rising edge of the ACK clock pulse. There is no limitation on the number of data bytes
received in one read transmission, but when the final byte is received, the bus master must not acknowledge the
data.
Figure 8. Read From Register
<br/>
A.
This figure assumes the command byte has been previously programmed with 00h.
B.
Transfer of data can be stopped at any moment by a stop condition. When this occurs, data present at the last
acknowledge phase is valid (output mode). Input data is lost.
C.
This figure eliminates the command byte transfer, a restart, and slave address call between the initial slave address
call and actual data transfer from the P port (see Figure 8).
Figure 9. Read Input Port Register
10
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Copyright © 2005–2008, Texas Instruments Incorporated
Product Folder Link(s): PCA9557


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