TDA7705 STMicroelectronics, TDA7705 Datasheet - Page 12

• Manufacturer Part Number: TDA7705
• Description: IC TUNER HIT AM/FM CAR RAD 64LQF
• Manufacturer: STMicroelectronics

Specifications of TDA7705

• Modulation Or Protocol: AM, FM
• Applications: Automotive Audio
• Current - Receiving: 220mA
• Data Interface: PCB, Surface Mount
• Antenna Connector: PCB, Surface Mount
• Voltage - Supply: 4.75 V ~ 5.25 V
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 64-TQFP, 64-VQFP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Features: -
• Frequency: -
• Sensitivity: -
• Memory Size: -
• Data Rate - Maximum: -

Function description
2.12
2.13
2.13.1
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IO interface pins
The TDA7705 has the following IO pins:
PLLTEST
SPI_CS
SPI_MISO
SDA/MOSI
SCL/CLK
RDSINT
RSTN
The pins labeled GPIO0, 1, 2 and 3 (pins 43 to 40) are reserved.
The pin PLLTEST output voltage can be freely programmed via software and be used to
drive switches if needed by the application.
All the inputs are voltage-tolerant up to 3.5 V . The outputs can drive currents up to 0.5 mA
from the internal 3.3 V supply line.
Serial interface
The device is controlled with a standard I
Through the serial bus the processing parameters can be modifed and the signal quality
parameters and the RDS information can be read out.
The operation of the device is handled through high level commands sent by the main car-
radio µP through the serial interface, which allow to simplify the operations carried out in the
main µP. The high level commands include among others:
●
●
●
Serial interface choice / boot mode
The device can communicate with the main µP with two different standard serial protocols:
SPI and I
and 39 and it is latched (e.g. made effective) when the RSTN line transitions from low to
high (when RSTN is low, the IC is in reset mode).
The voltage level forced to pins 35 and 39 must be released to start the system operation a
suitable time after the RSTN line has gone high.
The list of configurations is shown in the following table:
set frequency (which allows to avoid computing the PLL divider factors);
start seek (the seek operation can be carried out by the TDA7705 in a completely
autonomous fashion);
RDS seek/search (jumps to AF and quality measurements are automatically
sequenced).
2
C. The configuration is chosen by setting the proper value (0V or 3.3V) at pins 35
pin 2
pin 34
pin 35
pin 36
pin 37
pin 39
pin 45
general purpose output
serial communication with µP
serial communication with µP
serial communication with µP
serial communication with µP
serial communication with µP
reset pin driven by µP
Doc ID 15938 Rev 8
2
C bus or SPI interface.
TDA7705