L9918 datasheet(37/109 Pages) STMICROELECTRONICS

37 / 109 page

(RX byte3 invalid means BZ, F and BI/BZ bits ignored)

F_G:

IEXC flag: current limitation flag, 1 bit (enabled by programming)

F_H:

LRC flag: LRC function flag, 1 bit (enabled by programming)

Bit answered as “dominant”, 1 bit

F_L1:

Diagnosis flag for LIN error, 1 bit

F_L0:

Diagnosis flag LIN communication timeout, 1 bit

Setpoint/battery voltage/chip temperature/alternator speed, 8 bits, see Section 5.3.1.1

5.3.2

Message frame for configuration version-B

5.3.2.1

Rx Frame version-B

Table 16. Identifiers: 0x29 (LIN1), 0x2A (LIN2, LIN4), 0x20 (LIN3)

Byte 0

Byte 1

Byte 2

Byte 3

A8:

Setpoint (VBSPLINRG), 8 bits

B2:

LRC-Rise, 4 bits

C1:

LRC-Cut, 4 bits

Don’t care bit, 1 bit

D7:

Excitation Current Limitation, 7 bits

RB:

Output selection for TxFrame_2/Byte 3 Section 5.3.1.4 , 3 bits

BZ:

LRC blind zone (feature enabled by TV_SPRUNG_EN NVM register), 1 bit

Setpoint limitation threshold for high temperature (delta), 3 bits

WB:

Regulation loop parameters change to optimize the regulation Without Battery 1 bit (activity selectable by customer

configuration).

5.3.2.2

Tx Frame 1 version-B

Table 17. 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).

L9918

LIN Frames

DS13000 - Rev 2

page 37/109

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