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L9396 Datasheet(PDF) 89 Page - STMicroelectronics

Part # L9396
Description  Automotive multiple power supply IC
PDF  109 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

L9396 Datasheet(HTML) 89 Page - STMicroelectronics

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DS12539 Rev 10
89/109
L9396
Serial Peripheral Communication
109
8
Serial Peripheral Communication
The SPI interface is used to configure the device, control the output and read the diagnostic
and output status registers.
The SPI protocol is defined by frames of 32 bits with 3 bits of CRC (Cyclic Redundancy
Check) both in input and output directions.
Every time the device sets a Clear on Read bit in one of the SPI registers (for example when
an error is detected), such a bit will not be cleared until the corresponding register is read
via SPI. The bit will not be reset if an SPI error occurs during the access to the register by
the microcontroller or while L9396 sends the content of the register as an answer.
8.1
CRC Field Details
SPI frame (upstream/downstream) include a 3-bit CRC field. CRC field is evaluated
/checked by using a three-degree poly G3(x) = x3+x+1 and covers the bits 0:28 in the SPI
frame.
CRC flops are initialized to 0 at the beginning of the SPI frame.
8.2
SPI frame
SDI
Bit 0 to 15
Bit 16 to 31
SDI
Frame 0
Frame 1
SDO
Frame 0
Frame 1
FRAME 0
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
W/R ADD
0
DATA[19..13]
FRAME 1
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
DATA[12..0]
CRC[2..0]



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