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L99LD21 데이터시트(PDF) 30 Page - STMicroelectronics

부품명 L99LD21
상세설명  High power LED driver for automotive applications
PDF  73 Pages
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제조업체  STMICROELECTRONICS [STMicroelectronics]
홈페이지  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

L99LD21 데이터시트(HTML) 30 Page - STMicroelectronics

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SPI functional description
L99LD21
30/73
DS11130 Rev 5
Where:
OCx: Operation Code
Ax : Address
Dx: Data bit
Command Byte
Each communication frame starts with a command byte. It consists of an operating code
which specifies the type of operation (<Read>, <Write>, <Read and Clear>, <Read Device
Information>) and a 6 bit address.
The <Write Mode> and <Read Mode> operations allow access to the RAM of the device.
A <Read and Clear Mode> operation is used to read a status register and subsequently
clears its content.
The <Read Device Information> allows access to the ROM area which contains device
related information.
Global Status Byte
According to the ST SPI 4.1 standard, the first byte on the SDO pad during each command
reports the global status of the chip:
Table 8. Data byte 0
Data byte 0
Bit
76543210
Name
D7
D6
D5
D4
D3
D2
D1
D0
Table 9. Operation code definition
OC1
OC0
Meaning
0
0
<Write Mode>
0
1
<Read Mode>
1
0
<Read and Clear Mode>
1
1
<Read Device Information>
Table 10. Global Status Byte
Global Status Byte
Bit
31
30
2928
272625
24
Name
GSBN
RSTB
SPIE
FE2
FE1
DE
GW
FS



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