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L9305 Datasheet(PDF) 48 Page - STMicroelectronics

Part # L9305
Description  Automotive 4-channel valve driver
PDF  107 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

L9305 Datasheet(HTML) 48 Page - STMicroelectronics

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Figure 23. SPI frame after Power On Reset
Frame #0
Add_#0
Data[Add_#0]
IC Registers
Data_#0 = 0xYYYY
R
0
0
crc
0
0
0
crc
Data_fdbk = 0x0000
Add_fdbk = 0x00
Frame #n+1
Add_#1
Data_#1 = 0xYYYY
RW
0
0
crc
0
0
0
crc
Data_#0
Add_#0
GADG2709181452PS
Upon reading a register with Clear on Read fields, the related bits will be cleared only when data has been
completely moved on the next SPI access as shown in Figure 24.
Figure 24. Clear on Read SPI sequence
Frame #n
Add_#n
Data[Add_#n] [cleared]
IC Registers
Data_#n = 0x0000
R
0
0
crc
0
0
0
crc
Data_#n-1
Add_#n-1
Frame #n+1
Add_#n+1
Data_#n+1 = 0xYYYY
RW
0
0
crc
0
0
0
crc
Data_#n
Add_#n
GADG2709181454PS
Data[Add_#n] [uncleared]
IC Registers
Upon register write, data is updated after the frame is completely received and no error has been detected (CRC,
frame sequence, frame length). On the next SPI access, MISO data field will contain updated data content from
the written register as shown in Figure 25.
Figure 25. SPI write sequence
Frame #n
Add_#n
Data[Add_#n]
IC Registers
Data__#n = 0xABCD
W
0
0
crc
0
0
0
crc
Data_#n-1
Add_#n-1
Frame #n+1
Add_#n+1
Data_#n+1 = 0xYYYY
RW
0
0
crc
0
0
0
crc
Data_#n = ABCD
Add_#n
GADG2709181455PS
The SPI interface is supplied by VDDIO pin and consists of the following pins and definitions:
L9305
SPI
DS12774 - Rev 10
page 48/107



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