UPC1857A データシートの表示（PDF） - NEC => Renesas Technology

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UPC1857A

SOUND CONTROL IC WITH SURROUND AND I2C BUS

NEC => Renesas Technology 

µPC1857A

3.2 Data Transfer Format

Figure 3-4 shows an example of data transfer in write mode.

SDA

Figure 3-4. Example of Data Transfer in Write Mode

Slave address

SA0

Subaddress

Data

D6 D5 D4 D3 D2 D1 D0 W ACK D7 D6 D5 D4 D3 D2 D1 D0 ACK D7 D6 D5 D4 D3 D2 D1 D0

ACK

SCL

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 µPC1857A. This slave address is registered by Philips.

Table 3-1. Slave Address of µPC1857A

Slave Address

Bias Voltage of ADS (Pin 22)

D6

D5

D4

D3

D2

D1Note

D0

5V

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 µPC1857A is write mode only.

The byte following the slave address is the subaddress byte of the µPC1857A.

The µPC1857A has five subaddresses, from SA0 to SA4, and each of these addresses is composed of 8 bits. The

data to be set to a subaddress follows this subaddress byte.

17

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