TDA7540N STMicroelectronics, TDA7540N Datasheet - Page 38

• Manufacturer Part Number: TDA7540N
• Description: IC TUNER AM/FM CAR RADIO 80-LQFP
• Manufacturer: STMicroelectronics

Specifications of TDA7540N

• Frequency: 10.7MHz
• Modulation Or Protocol: AM, FM
• Applications: Automotive Audio
• Current - Receiving: 12mA
• Data Interface: PCB, Surface Mount
• Antenna Connector: PCB, Surface Mount
• Voltage - Supply: 7.7 V ~ 9 V
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 80-LQFP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Features: -
• Sensitivity: -
• Memory Size: -
• Data Rate - Maximum: -
• Lead Free Status / Rohs Status: Compliant

Functional description
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The last bit of the start instruction defines the type of operation to be performed:
The TDA7540N 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 TDA7540N 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 64 internal addresses.
Upon receipt of the word address the TDA7540N slave device will respond with an
"acknowledge". At this time, all the following words transmitted to the TDA7540N will be
considered as Data. The internal address will be automatically incremented up to hex40 in
page mode. Than again subaddresse hex60 has to be transmitted for following registers
above 32.
After each word receipt the TDA7540N will answer with an "acknowledge".
Read operation
If the master sends a slave address word with the R/W bit set to "1", the TDA7540N 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 (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)
When set to "1", a read operation is selected
When set to "0", a write operation is selected
TDA7540N