TDA7512F datasheet(22/45 Pages) STMICROELECTRONICS

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Functional description

TDA7512F

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Doc ID 12668 Rev 2

4.6.5

Data transfer

During data transfer the device samples the SDA line on the leading edge of the SCL clock.

Therefore, for proper device operation the SDA line must be stable during the SCL LOW to

HIGH transition.

4.6.6

Device addressing

To start the communication between two devices, the bus master must initiate a start

instruction sequence, followed by an eight bit word corresponding to the address of the

device it is addressing.

The most significant 6 bits of the slave address are the device type identifier.

The TDA7512F device type is fixed as "110001".

The next significant bit is used to address a particular device of the previous defined type

connected to the bus.

The state of the hardwired PIN 41 defines the state of this address bit. So up to two devices

could be connected on the same bus. When PIN 41 is connected to VCC2 the address bit

“1” is selected. When PIN 41 is left open the address bit “0” is selected. Therefor a double

FM tuner concept is possible.

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

–

When set to "1", a read operation is selected

–

When set to "0", a write operation is selected

The TDA7512F connected to the bus will compare their own hardwired address with the

slave address being transmitted, after detecting a START condition. After this comparison,

the TDA7512F will generate an "acknowledge" on the SDA line and will do either a read or a

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

4.6.7

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 TDA7512F slave device will respond with an

"acknowledge". At this time, all the following words transmitted to the TDA7512F will be

considered as Data.

The internal address will be automatically incremented. After each word receipt the

TDA7512F will answer with an "acknowledge".

4.6.8

Read operation

If the master sends a slave address word with the R/W bit set to "1", the TDA7512F will

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

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

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

bit2 (MPOUT,1 = multipath present, 0 = no multipath)

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