TDA7513 datasheet(28/58 Pages) STMICROELECTRONICS

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TDA7513

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1000110d

stereo decoder / audio processor address (APSD)

The last bit of the start instruction defines the type of operation to be performed:

– when set to "1", a read operation is selected (data are transferred from the device to the master)

– when set to "0", a write operation is selected (data are transferred from the master to the device)

The device connected to the bus will compare its own hardwired addresses with the slave address being

transmitted after detecting a START condition.

After this comparison, the device will generate an "acknowledge" on the SDA line and will perform either

a read or a write operation according to the state of the R/W bit.

Write Operation

Following a START condition the master sends a slave address word with the R/W bit set to "0". The de-

vice will generate an "acknowledge" after this first transmission and will wait for a second word (the sub-

address field).

This 8-bit address field provides an access to any of the 64 internal addresses (32 corresponding to the

tuner address and 32 corresponding to the stereo decoder / audio processor address). Upon receipt of the

subaddress the device will respond with an "acknowledge".

At this time, all the following words transmitted to the device will be considered as Data.

The internal address may be automatically incremented if the auto-increment mode is selected (bit S5 of

the subaddress word) .

After each word has been received the device will answer with an "acknowledge".

Read Operation

IF the master sends a slave address word with the R/W bit set to "1", the device will transmit one 8-bit data

word.

This data word content changes according to the address corresponding to the tuner or to the stereo de-

coder / audio processor. The information are the following:

–tuner

bit0:

ISS filter, 1 = ON, 0 = OFF

bit1:

ISS filter bandwidth, 1 = 80kHz, 0 = 120kHz

bit2:

MPOUT,1 = multipath present, 0 = no multipath

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

– stereo decoder / audio processor

bit2:

Soft Mute status, 1 = ON, 0 = OFF

bit3:

Stereo mode, 1 = stereo, 0 = mono

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