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參數(shù)資料
| 型號： | UPC1857 |
| 廠商： | NEC Corp. |
| 英文描述： | SOUND CONTROL IC WITH SURROUND AND I2C BUS |
| 中文描述： | 聲控集成電路環(huán)繞和I2C總線 |
| 文件頁數(shù)： | 17/44頁 |
| 文件大小： | 343K |
| 代理商： | UPC1857 |
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17
μ
PC1857A
3.2
Data Transfer Format
Figure 3-4 shows an example of data transfer in write mode.
Figure 3-4. Example of Data Transfer in Write Mode
D6
SDA
D5 D4 D3 D2 D1 D0
Slave address
D7 D6 D5 D4 D3 D2 D1 D0
Subaddress
SA
D7 D6 D5 D4 D3 D2 D1 D0
Data
SCL
W
ACK
ACK
ACK
Remark
W: Write mode, ACK: Acknowledge bit
Data is composed of 8 bits. One acknowledge bit always follows these 8 bits of data. Data must be transferred
starting from the MSB.
The 1 byte immediately following the start condition specifies a slave address (chip address). This slave address
is composed of 7 bits.
Table 3-1 shows the slave address of the
μ
PC1857A. This slave address is registered by Philips.
Table 3-1. Slave Address of
μ
PC1857A
Slave Address
Bias Voltage of ADS (Pin 22)
D6
D5
D4
D3
D2
D1
Note
D0
5 V
1
0
0
0
1
1
0
GND
1
0
0
0
1
0
0
Note
The user can set bit D1 freely.
0: Bias voltage of ADS (pin 22) is 0 V.
1: Bias voltage of ADS (pin 22) is 5 V.
The 1 bit following the slave address is a read/write bit which specifies the direction of the data to be subsequently
transferred. Write “0” to this read/write bit because the
μ
PC1857A is write mode only.
The byte following the slave address is the subaddress byte of the
μ
PC1857A.
The
μ
PC1857A has five subaddresses, from SA
0
to SA
4
, and each of these addresses is composed of 8 bits. The
data to be set to a subaddress follows this subaddress byte.
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