APA3160 データシートの表示（PDF） - Anpec Electronics
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APA3160 Datasheet PDF : 44 Pages
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APA3160
Function Description (Cont.)
Multiple-Byte Write
A multiple-byte data write transfer is identical to a single-byte data write transfer except that multiple data bytes are
transmitted by the master device to the DAP as shown in Figure 12. After receiving each data byte, the APA3160
responds with an acknowledge bit.
Start
Condition
Acknowledge
Acknowledge Acknowledge
Acknowledge Acknowledge
A6 A5 A1 A0 R/W ACK A7 A6 A2 A1 A0 ACK D7 D0 ACK D7
D0 ACK D7 D0 ACK
I2C Device Address
and Read/ Write Bit
Sub-address
First Data Byte
Other Data Bytes
Last Data Byte
Stop
Condition
Figure 12. Multiple-Byte Write Transfer
Single-Byte Read
As shown in Figure 13, a single-byte data read transfer begins with the master device transmitting a start condition
followed by the I2C device address and the R/W bit. For the data read transfer, both a write followed by a read are
actually done. Initially, a write is done to transfer the address byte or bytes of the internal memory address to be read.
As a result, the R/W bit becomes a 0. After receiving the APA3160 address and the read/write bit, APA3160 responds
with an acknowledge bit. Besides, after sending the internal memory address byte or bytes, the master device
transmits another start condition followed by the APA3160 address and the read/write bit again. This time the read/
write bit becomes a 1, indicating a read transfer. After receiving the address and the read/write bit, the APA3160 again
responds with an acknowledge bit. And then, the APA3160 transmits the data byte from the memory address being
read. After receiving the data byte, the master device transmits a not acknowledge followed by a stop condition to
complete the single byte data read transfer.
Start
Condition
Acknowledge
Acknowledge
Acknowledge
Not Acknowledge
A6 A5 A1 A0 R/W ACK A7 A6 A1 A0 ACK
A6 A5 A1 A0 R/W ACK D7 D6 D1 D0 ACK
I2C Device Address
and Read/ Write Bit
Sub-address
Repeat Start
Condition
I2C Device Address
and Read/ Write Bit
Data Byte
Stop
Condition
Multiple-Byte Read
Figure 13. Single-Byte Read Transfer
A multiple-byte data read transfer is identical to a single-byte data read transfer except that multiple data bytes are
transmitted by the APA3160 to the master device as shown in Figure 14. Except for the last data byte, the master device
responds with an acknowledge bit after receiving each data byte.
Start
Condition
Acknowledge
Repeat Start
Condition
Acknowledge
Acknowledge Acknowledge
Acknowledge Not Acknowledge
A6 A0 R/WACK A7 A6 A1 A0 ACK
A6 A0 R/WACK D7 D0 ACK D7
D0 ACK D7 D0 ACK
I2C Device Address
and Read/ Write Bit
Sub-
address
I2C Device Address First Data
and Read/ Write Bit
Byte
Figure 14. Multiple-Byte Read Transfer
Other Data
Bytes
Last Data
Byte
Stop
Condition
Copyright © ANPEC Electronics Corp.
17
Rev. A.4 - Jan., 2013
www.anpec.com.tw
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