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TDA7705 数据表(PDF) 22 Page - STMicroelectronics |
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TDA7705 数据表(HTML) 22 Page - STMicroelectronics |
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22 / 42 page  Electrical specifications TDA7705 22/42 Doc ID 15938 Rev 9 3.4.10 SPI interface The following parameters apply to the serial bus communication when SPI protocol has been selected at start-up. For the other electrical characteristics of the pins, Section 3.4.8 applies. Figure 9. SPI bus timing diagram 3.4.11 Warning When the TDA7705 is not powered on, the internal ESD protection diodes pull-down keep the I2C/SPI lines connected to ground. This implies that the I2C/SPI bus connected to the TDA7705 may not be used to drive other devices when the TDA7705 is powered off. Table 16. SPI interface Symbol Parameter Min Max Unit fSCK Clock frequency - 4.0 MHz tSU Data setup time 25 - ns tH Data hold time 25 - ns tWH SCK high time 50 - ns tWL SCK low time 50 - ns tRI Input rise time - 2 µs tFI Input fall time - 2 µs tV Output valid from clock low - 50 ns tHO Output hold time 25 - ns tDIS Output disable time 25 ns tCS CS high time 25 - ns tCSS CS setup time 25 - ns tCSH CS hold time 25 - ns VALID IN VIH VIL tCSS VIH VIL VIH VIL VOH VOL HI-Z tSU tH tWH tWL tV tCS tCSH tHO tDIS HI-Z SPI_SS SPI_CLK SPI_MOSI SPI_MISO tRI tFI |
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