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LDLL16ENTR Datasheet(PDF) 44 Page - STMicroelectronics

Part # LDLL16ENTR
Description  16-channel LED driver with automotive CAN FD light interface
PDF  102 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

LDLL16ENTR Datasheet(HTML) 44 Page - STMicroelectronics

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5.7.9
Unicast frame - single RAM write
The MSB of the commander request data frame contains the OP code and address of the register. The responder
answer contains only the GSB.
Figure 35. Unicast frame with single RAM write - commander request and responder answer
10
9
8
7
6
5
4
3
2
1
0
OP Code + Address
Commander request => 0
0
CTRL
"00" + Address
Data Byte 3
Data Byte 2
Data Byte 1
Data Byte 0
CRC
ACK/EOF
Responder answer => 0
1
CTRL
GSB
CRC
ACK/EOF
Responder ID[8:0]
Responder ID[8:0]
ID field bits
Therefore, the commander request frame contains five data bytes, while the responder answer frame contains
only one data byte.
5.7.10
Unicast frame - 3x RAM write
This instruction allows to write to three different RAM addresses with one CAN FD frame. Only OP code “00” is
allowed in this mode. The commander frame request contains 16 data bytes. The MSB of the commander request
data frame contains the OP code and address of the register, followed by four data bytes to be written to the
addressed register. Next five data bytes contain again the OP code, address, and data to be written. Next five
data bytes contain again the OP code, address, and data to be written. LSB is "Don´t care". This write mode
allows therefore a fast programming of configuration registers lowering the bit overhead and bus-load.
The responder answer contains only the GSB.
Figure 36. Unicast frame with 3x RAM write - commander request and responder answer
10
9
8
7
6
5
4
3
2
1
0
OP Code + Address
Commander request => 0
0
CTRL
"00" + Address
Data Byte 3
Data Byte 2
Data Byte 1
Data Byte 0
=>
=>
"00" + Address
Data Byte 3
Data Byte 2
Data Byte 1
Data Byte 0
=>
=>
"00" + Address
Data Byte 3
Data Byte 2
Data Byte 1
Data Byte 0
Do not care
CRC
ACK/EOF
Responder answer => 0
1
CTRL
GSB
CRC
ACK/EOF
ID field bits
Responder ID[8:0]
Responder ID[8:0]
5.7.11
Unicast CAN FD frame - FTP read
This command allow to read a content of specified FTP address. The commander request frame contains 16 data
bytes. The first byte contains the OP code (Ah - FTP read) and 4 bit FTP row address. Next 15 bytes are do not
care. The responder answers with 16 data byte frame containing FTP row data. This command is effective only if
device is in FTP programming mode. Otherwise, no answer is sent.
Table 16. Unicast CAN FD frame - FTP read
ID field bits
10 9 8 7 6 5 4 3 2 1 0
OP Code +
Address
Commander
request =>
0
0 Responder ID[8:0]
CTRL
"1010" + FTP Row
Addr.
Do not care
14
Do not care
13
Do not care
12
=>
=>
Do not care 11
Do not care
10
Do not care 9
Do not care 8
=>
=>
Do not care 7
Do not care 6
Do not care 5
Do not care 4
=>
=>
Do not care 3
Do not care 2
Do not care 1
Do not care 0
CRC
ACK/
EOF
Responder
answer =>
0
1 Responder ID[8:0]
CTRL Do not care
Data Byte 14
Data Byte 13
Data Byte 12
=>
=>
Data Byte 11
Data Byte 10
Data Byte 9
Data Byte 8
=>
=>
Data Byte 7
Data Byte 6
Data Byte 5
Data Byte 4
=>
=>
Data Byte 3
Data Byte 2
Data Byte 1
Data Byte 0
CRC
ACK/
EOF
LDLL16EN
Communication interface
DS14111 - Rev 5
page 44/102



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