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TDA7703 Datasheet(PDF) 11 Page - STMicroelectronics |
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TDA7703 Datasheet(HTML) 11 Page - STMicroelectronics |
11 / 32 page TDA7703 Function description Rev 1 11/32 2.12 IO interface pins The TDA7703 has the following IO pins: 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. 2.13 Serial interface The device is controlled with a standard I2C bus interface. Through the serial bus the processing parameters can be modifed and the signal quality parameters 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: ● set frequency (which allows to avoid computing the PLL divider factors); ● start seek (the seek operation can be carried out by the TDA7703 in a completely autonomous fashion). The serial bus communication configuration is set by forcing pin 29 (BUSSET) to ground when the RSTN line transitions from low to high (when RSTN is low, the IC is in reset mode). The voltage level forced to pin 29 must be released to start the system operation a suitable time after the RSTN line has gone high. The I2C address is 0xC2 (write) / 0xC3 (read). The status of pin 29 during the reset phase can be set to low by not forcing any voltage on it from outside, as a 50 k Ω internal pull-down resistors is present. To make sure the boot mode is correctly latched up at start-up, it is advisable to keep the RSTN line low until the IC supply pins have reached their steady state, and then for an additional time Treset (see Section 3.4.6). I2C requires two signals: clock (SCL) and data (SDA - bidirectional). The protocol requires an acknowledge after any 8-bit transmission. A "write" communication example is shown in the figure below, for an unspecified number of data bytes (see Communication Protocol Manual for frame structure description): Figure 3. I2C "write" sequence SDA pin 26 serial communication with µP SCL pin 27 serial communication with µP BUSSET pin 29 serial communication with µP RSTN pin 30 reset pin driven by µP ACK data STOP clk1 clk2 … clk8 clk9 clk1 clk2 START ACK d7 d6 address a0 … d0 … clk8 clk9 a7 a6 … SCL SDA |
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