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TCA9535PWR датащи(PDF) 11 Page - Texas Instruments

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номер детали TCA9535PWR
подробное описание детали  LOW VOLTAGE 16-BIT I2C AND SMBus LOW-POWER I/O EXPANDER WITH INTERRUPT OUTPUT AND CONFIGURATION REGISTERS
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производитель  TI [Texas Instruments]
домашняя страница  http://www.ti.com
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TCA9535PWR датащи(HTML) 11 Page - Texas Instruments

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background image
1
2
SCL
3
4
5
6
7
8
SDA
A
A
A
Data 0
Data to Register
R/W
9
0
0
0
0
0
0
1
1
MSB
LSB
Data 1
MSB
LSB
A
Data to Register
S
0
1
0
0
A2 A1 A0
0
1
2
3
4
5
6
7
8
9
1
2
3
4
5
6
7
8
9
1
2
3
4
5
P
Acknowledge
From Slave
Acknowledge
From Slave
Start Condition
Command Byte
Slave Address
Acknowledge
From Slave
Reads
0
0
A2 A1 A0
0
1
0
0
A2
A1 A0
0
1
S
0
A
A
A
R/W
A
P
NA
S
R/W
1
MSB
LSB
MSB
LSB
Slave Address
Acknowledge
From Slave
Command Byte
Data From Upper
or Lower Byte
of Register
Last Byte
Data
Acknowledge
From Slave
Acknowledge
From Slave
Slave Address
Data From Lower
or Upper Byte
of Register
First Byte
Data
No Acknowledge
From Master
Acknowledge
From Master
At this moment, master
transmitter becomes master
receiver, and slave receiver
becomes slave transmitter.
TCA9535
www.ti.com........................................................................................................................................... SCPS201A – AUGUST 2009 – REVISED SEPTEMBER 2009
Figure 7. Write to Configuration Registers
The bus master first must send the TCA9535 address with the least-significant bit 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 least-significant bit is set to a logic 1. Data
from the register defined by the command byte then is sent by the TCA9535 (see Figure 8 through Figure 10).
After a restart, the value of the register defined by the command byte matches the register being accessed when
the restart occurred. For example, if the command byte references Input Port 1 before the restart, and the restart
occurs when Input Port 0 is being read, the stored command byte changes to reference Input Port 0. The original
command byte is forgotten. If a subsequent restart occurs, Input Port 0 is read first. Data is clocked into the
register on the rising edge of the ACK clock pulse. After the first byte is read, additional bytes may be read, but
the data now reflect the information in the other register in the pair. For example, if Input Port 1 is read, the next
byte read is Input Port 0.
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/>
Copyright © 2009, Texas Instruments Incorporated
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