L9918 datasheet(36/109 Pages) STMICROELECTRONICS

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F_T:

Diagnosis flag for thermal fault, 1 bit

F_M:

Diagnosis flag for mechanical failure, 1 bit

F_E:

Diagnosis flag for electrical failure, 1 bit

DCE5:

Duty cycle value of the excitation PWM, 5 bits

EXC6:

Excitation current measure, 6 bits

L1:

Diagnosis flag for LIN error, 1 bit

L0:

Diagnosis flag LIN “communication timeout”, 1 bit

5.3.1.3

Tx Frame 2 version-A

Table 14. Identifiers: 0x12 (LIN1), 0x14 (LIN2), 0x21 (LIN3), 0x11 (LIN4)

Byte 0

Byte 1

AltS

AltL

DieS

DieL

AltS:

Alternator supplier identification, 3 bits (defined by HER_ID NVM register).

AltL:

Alternator identification, 5 bits (defined by GEN_ID NVM register).

DieS:

Chip supplier identification, 3 bits (set to 0x3 by EOL programming).

DieL:

Chip identification, 5 bits (set to 0x00 by EOL programming).

5.3.1.4

Tx Frame 3 version-A

Table 15. Identifiers 0x15 (LIN1), 0x16 (LIN2, LIN4), 0x18 (LIN3)

Byte 0

Byte 1

Byte 2

Byte 3

DCE5

EXC8

F_T:

Diagnosis flag for thermal fault, 1 bit

F_M:

Diagnosis flag for mechanical failure, 1 bit

F_E:

Diagnosis flag for electrical failure, 1 bit

DCE5

Duty cycle value of the excitation PWM, 5 bits

EXC8:

Measured excitation current, 8 bits

RB:

Confirmation of the selected output variable done in RxFrame Byte 3, 3 bits Selected code = Confirmation code

000: RX byte 3 invalid (all bits set as dominant)

001: Vset point feedback (VSPFBK8 table)

010: Vmeas (BV8 table)

011: Tjunction (TJ8 table)

100: Alt. rotation speed (RPM8 table)

101: 00000000

110: reserved

111: RX byte3 invalid

L9918

LIN Frames

DS13000 - Rev 2

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