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L9780 Datasheet(PDF) 31 Page - STMicroelectronics |
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L9780 Datasheet(HTML) 31 Page - STMicroelectronics |
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31 / 56 page  DocID026356 Rev 3 31/56 L9780 Digital interface description 55 6 Digital interface description L9780 contains a serial peripheral interface (SPI) composed by the serial clock (CLK), serial data out (SO), serial data in (SI), chip select (CSN) and is configured as an SPI slave. If CSN is asserted and the SPI master continues to issue CLK pulses after the SPI shift register is filled, the device shall shift the master’s SI data out on SO output. SPI can support a daisy chain configuration, so the external processor can send SPI commands to multiple devices without using additional chip select pins, as shown in Figure 9 and 10. Figure 9. Daisy chain configuration Figure 10. SPI transmission in Daisy chain configuration The first 64 bit data coming out of SO are the output register bits; the subsequent bits are the SPI commands received through SI pin. |
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