TS4975 datasheet(23/36 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 addressing byte with the slave address.

In order to read data from the TS4975, after the “start” message, the MCU must send and

receive the following data:

●

send byte with the I²C 7-bit slave address and 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 the byte with slave address. In this case the value of control register is read

repeatedly.

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

the TS4975 (see

Section 4.9: Pop and click performance on page 31 and Section 4.10: Thermo

shutdown on page 32).

Figure 59. I²C write/read operations

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

5SD

G x In1

6SD

G x In2

G x In1

G 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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