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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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TDA7415CB датащи(PDF) 32 Page - STMicroelectronics |
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TDA7415CB датащи(HTML) 32 Page - STMicroelectronics |
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32 / 50 page  Digital interface TDA7415CB 32/50 6 Digital interface The TDA7415CB digital interface supports two different protocols: SPI and I2C. To select the I2C-mode the SEL-pin has to be tied to the system supply by means of a 68k -resistor. If the voltage at the SEL-pin falls below 5.5V, the interface switches to SPI-mode. Consequently, the interface is able to work with a microprocessor either supplied by a 3.3V or a 5V power supply. The SPI-mode has to be set and remain static before the device leaves the reset state caused by power-on reset (POR). For details of both protocols refer to the programming section. 6.1 Interface in SPI -mode ● Interface protocol The SPI interface protocol comprises: – A sub-address (SAx) and A sequence of n data bytes (Dy); each consisting of 8 bits. A negative going edge at SEL enables the interface receiving data. The interface accepts both a positive (Cpol=1, Cpha=1; SPI-mode 0) as well as a negative (Cpol=0, Cpha=0; SPI- mode 3) clocking scheme. However, the data transmitted has to be valid on the rising edges of the serial clock SCL. Figure 24. Switching characteristics (SPI-mode): Figure 25. Interface in SPI -mode diagram Tscl Tsu Tsh Thld Twh Twl Trel SEL SCL SDA SAx,Dy AC00507 |
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