TDA7541B datasheet(41/77 Pages) STMICROELECTRONICS

41 / 77 page

TDA7541B

Functional description

Doc ID 16048 Rev 1

41/77

Write operation

Following a START condition the master sends a slave address word with the R/W bit set to

"0". The device will generate an "acknowledge" after this first transmission and will wait for a

second word (the word address field). This 8-bit address field provides an access to any of

the 32 internal addresses. Upon receipt of the word address the TDA7541B slave device will

respond with an "acknowledge". At this time, all the following words transmitted to the

TDA7541B will be considered as Data. The internal address will be automatically

incremented. After each word receipt the TDA7541B will answer with an "acknowledge".

Read operation

If the master sends a slave address word with the R/W bit set to "1", the TDA7541B will

transmit one 8-bit data word. This data word includes the following informations.

bit0 (ISS filter, 1 = ON, 0 = OFF)

bit1 (ISS filter bandwidth, 1 = 80 kHz, 0 = 120 kHz)

bit2 (STEREO, 1 = STEREO, 0 = MONO)

bit3 (1 = PLL is locked in, 0 = PLL is locked out).

bit4 (fieldstrength indicator, 1 = lower as softmute threshold,

0 = higher as softmute threshold)

bit5 (adjacent channel indicator, 1 = adjacent channel present,

0 = no adjacent channel)

bit6 (deviation indicator, 1 = strong overdeviation present,

0 = no strong overdeviation)

bit7 (deviation indicator, 1 = overdeviation present,

0 = no overdeviation)

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