L9918 datasheet(44/109 Pages) STMICROELECTRONICS

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5.4.1

Sleep frame

LIN Sleep Frame is a Master diagnostic frame carrying the following data bytes.

Table 30. LIN sleep frame

Byte 0

Byte 1

Byte 2

Byte 3

Byte 4

Byte 5

Byte 6

Byte 7

0x00

0xFF

Sleep frame is valid in all the supported DLL versions.

Once this frame has been received, sleep command is effectively applied within 106 ms. This is the latency time

needed by the device for decoding the frame and applying the sleep command.

5.4.2

Read by identifier

Read by Identifier is performed sending two consecutive frames.

The first one is a master diagnostic frame (ID = 0x3C) which identify the slave from which the answer is expected:

Table 31. Master diagnostic frame

Byte 0

Byte 1 Byte 2 Byte 3

Byte 4

Byte 5

Byte 6

Byte 7

NAD (1)

0x06

0XB2

0x00

Supplier ID LSB (2)

Supplier ID MSB (2)

Function ID LSB (2)

Function ID MSB (2)

1. NAD is defined into LIN_NAD NVM bits.

2. Supplier ID and Function ID are programmed by STM at EOL. They are set to 0x0040 and to 0x0000 respectively.

The second frame is a Slave response diagnostic (ID = 0x3D) to which the slave answers with the expected

information. Frame contents can be “positive” or “negative” whether the devices recognizes or not the NAD

carried by the 0x3C master frame.

Table 32. Negative slave answer

Byte 0

Byte 1

Byte 2

Byte 3

Byte 4

Byte 5

Byte 6

Byte 7

NAD

0x03

0X7F

0xB2

0x12

0xFF

Table 33. Positive slave answer

Byte 0

Byte 1

Byte 2

Byte 3

Byte 4

Byte 5

Byte 6

Byte 7

NAD

0x06

0XF2

Supplier ID LSB

Supplier ID MSB

Function ID LSB

Function ID MSB

Variant (1)

1. Variant is defined into LIN_VAR_ID NVM bits.

Read by Identifier feature is available for LIN2.x versions only.

5.4.3

Assign frame ID

Assign frame ID range is used to set or disable PIDs (IDs with calculated parity) up to four frames. The request

shall be structured as shown in below, ID = 0x3C:

Table 34. Assigne frame

Byte 0

Byte 1

Byte 2

Byte 3

Byte 4

Byte 5

Byte 6

Byte 7

NAD

0x06

0xB7

0x00

RX new PID

TX1 new PID

TX2 new PID

TX3 new PID

L9918

LIN Diagnostic frames

DS13000 - Rev 2

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