SM6452AM Просмотр технического описания (PDF) - Nippon Precision Circuits

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SM6452AM

Audio Variable Volume ICs

Nippon Precision Circuits  

SM6452AM/BM

SM6452BM

Transfer format

The SM6452BM uses Philips I2C interface to select channels and set attenuation levels. For details of the I2C

bus, refer to Philips “I2C Bus Specification Description”. Here, we describe only the aspects for controlling the

SM6452BM. The transfer format is shown in figure 2.

AD6 to AD0 = 1000000

First Byte

(Slave address)

Second Byte

Third Byte

SDA

AD6

AD0 L ACK

D15

D8 ACK

D7

D0 ACK

SCL

Start condition

Stop condition

Figure 2. Microcontroller input data timing

As shown in figure 2, the data format comprises 3 bytes. After the SM6452BM receives 8 bits for each byte, an

acknowledge signal (ACK) on SDA goes LOW to confirm the data transfer.

Data format

s Byte 1 (slave address)

The first byte is slave address. The SM6452BM address (AD6 to AD0) is 1000000. The 8th bit indicates

information write and should be set LOW.

s Bytes 2 and 3

Bytes 2 and 3 are the channel select and gain/attenuation level set bits. Byte 2 represents data bits D15 to D8,

and byte 3 represents data bits D7 to D0.

Data description (D15 to D0)

s D15, D14

Don’t care.

s D13 to D8

Chip address bits. Each of 6 channels is set when the corresponding bit is set HIGH.

• D13: channel 1

• D12: channel 2

• D11: channel 3

• D10: channel 4

• D9: channel 5

• D8: channel 6

s D7 to D0

Gain/attenuation set bits. The gain/attenuation setting for ATT register settings are shown in table 1.

NIPPON PRECISION CIRCUITS—11

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