TDA7512FTR View Datasheet(PDF) - STMicroelectronics
Part Name
Description
Manufacturer
TDA7512FTR Datasheet PDF : 45 Pages
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Functional description
TDA7512F
4.6.5
4.6.6
4.6.7
4.6.8
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.
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.
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".
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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Doc ID 12668 Rev 2
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