TAS3004 datasheet(44/80 Pages) TI

44 / 80 page

6–4

Table 6–3 gives typical values of the wait states that can be expected with the various functions of the part:

Table 6–3. I2C Wait States

SYSTEM SAMPLING FREQUENCY

32 kHz

44.1 kHz

48 kHz

Comment

Volume

62 ms

49 ms

41 ms

Not dependent on size of change

Bass

231 ms

167 ms

153 ms

0 to –18 dB, –1 dB = 0.055 T @ fS

Treble

231 ms

167 ms

153 ms

0 to –18 dB, –1 dB = 0.055 T @ fS

DRC On

300

µs

300

µs

300

µs

Mixer

None

Loudness

None

Equalization

15 ms

190

µs

300

µs

Can occur with each filter

6.4

SMBus Operation

The TAS3004 device supports a subset of the SMBus protocol. With proper programming techniques, it is possible

to use the SMBus to set up the TAS3004 device.

6.4.1

Block Write Protocol

The TAS3004 device supports the block write protocol that allows up to 32 bytes to be sent as a block. To send a

command using this format, the most significant bit (MSB) of the TAS3004 subaddress must be set high and the

subaddress (also with MSB set high) must be programmed into the SMBus command byte. This operation signals

the TAS3004 device to realize that the next byte is the SMBus byte count byte. The next byte after the byte count is

then entered into the device as the first byte of data.

SMBus

Command Byte

68h

8rh

TAS3004

Address

Subaddress

(r = subaddress)

Byte Count

(Don’t Care)

Data

6.4.2

Write Byte Protocol

The TAS3004 device also supports the SMBus write byte protocol. Writing to the main control register (MCR), bass,

and treble registers require using the byte write protocol. To send a command using this format, the most significant

bit (MSB) of the TAS3004 subaddress must be set high and the subaddress (also with MSB set high) must be

programmed into the SMBus command byte. The next byte after the command byte is then entered into the device

as the first byte of data.

SMBus

Command Byte

68h

8rh

TAS3004

Address

Subaddress

(r = subaddress)

Data

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