TS4975 datasheet(19/33 Pages) STMICROELECTRONICS

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TS4975

Application Information

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All bytes are sent with MSB bit first. The transfer of written data ends with a “stop” message.

When transmitting several data, the data can be written with no need to repeat the “start”

message and slave address.

The slave address of the TS4975 for reading is CD or CF hex. In order to read data from the

TS4975, after the “start” message, the MCU must send and receive the following data:

●

send the I²C address slave byte with a high level for the R/W bit

●

receive the data (control register value)

All bytes are read with MSB bit first. The transfer of read data is ended with “stop” message.

When transmitting several data, the data can be read with no need to repeat the “start”

message and slave address. In this case the value of control register is read repeatedly.

When thermo shutdown or pop and click reduction is active, specific value is read from the

TS4975 (See 4: Application Information on page 18).

Figure 58. I²C write operation

Table 10.

Ouput mode selection: G from -34 dB to + 18dB (by steps of 4dB)(1)

SD = Shutdown Mode

In1 = Audio Input 1

In2= Audio Input2

G = Gain from Audio Input 1and Input 2 to Output1 and Output2

Output Mode #

Headphone Output 1

Headphone Output 2

0SD

G x In1

G x In2

G x In1

G x In2

G x In1

G x In2

7G x In1

8G x In2

SDA

D7 D6 D5 D4

Start condition

SLAVE ADDRESS

CONTROL REGISTERS

R/W

Acknowledge

from Slave

Acknowledge

from Slave

Stop condition

Volume Control

settings

Output

Mode settings

Phantom Ground

settings

SDA

D7 D6 D5 D4

Start condition

SLAVE ADDRESS

CONTROL REGISTERS

R/W

Acknowledge

from Slave

Acknowledge

from Slave

Stop condition

Volume Control

settings

Output

Mode settings

Phantom Ground

settings

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