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L9800 Datasheet(PDF) 41 Page - STMicroelectronics

Part # L9800
Description  Automotive 8-channel LS driver
PDF  55 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

L9800 Datasheet(HTML) 41 Page - STMicroelectronics

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Figure 31. Daisy chain
GADG081120231031GT
Device 1
Device 3
Device 2
MO
SI
SI
SI
SO
SO
SO
MI
MCSN
MCLK
SPI
SPI
SPI
In the SPI block of each device, there is one shift register where each bit from the MOSI line is shifted in each
CLK. The bit shifted out occurs at the MISO pin. After 16 CLK cycles, the data transfer for one device is finished.
In single chip configuration, the NCS line must turn “high” to make the device acknowledge the transferred data.
In daisy chain configuration, the data shifted out at device 1 has been shifted into device 2. When using three
devices in daisy chain, more than 16 bits have to be shifted through the devices (depending on how many devices
are connected and how many SPI bits they have). After that, the MNCS line must turn “high” (see the Figure 32).
Figure 32. Data transfer in daisy chain
MI
MO
MNCS
MCLK
SI device 3
SI device 2
SI device 1
SO device 3
SO device 2 SO device 1
11.3
Timing diagrams
Figure 33. Timing diagram
L9800
Serial peripheral interface (SPI)
DS14041 - Rev 2
page 41/55



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