L9918 datasheet(43/109 Pages) STMICROELECTRONICS

43 / 109 page

BV8

RPM8

TJ8

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 Table 50

EXC8:

Measured excitation current, 8 bits Table 53

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

A8:

Adopted set point, 8bits

BV8:

Battery voltage measure, 8bits

RPM8:

Alternator rotation frequency measure, 8 bits

TJ8:

Junction temperature measure, 8 bits

5.3.7

Measurements filter

5.3.7.1

Excitation duty cycle

Dc on excitation measure available by LIN Tx frames is optionally filtered with respect to actual Dc on excitation

value. Filter parameters are configurable by NVM bit (DFM_FILTER_TP).

5.3.7.2

Iexc measurement filter

Iexc measure available by LIN Tx frames is optionally filtered with respect to actual Iexc value. Filter parameters

are configurable by NVM bits (IFELD_FILTER).

5.3.7.3

B+ measurement filter

B+ voltage measure available by LIN Tx frames is optionally filtered with respect to actual B+ voltage value. Filter

parameters are configurable by NVM bits (BF_FILT/BF_FILT2).

5.3.7.4

Regulation loop parameters

L9918 regulation loop is conceived to be configured to meet the largest application requirements. Active

parameter value (eg. LRC-rise, LRC-cut speed) is selected within pre-fixed set of values. Parameters Sets are

typically stored in NVM.

Default configuration (static configuration) provides a full set of regulation parameters.

LIN Rx frame (dynamic configuration) can modify available set/value only for some of regulation parameters.

5.4

LIN Diagnostic frames

Other than LIN frames listed in the previous paragraphs, L9918 supports further specific frames, implemented for

diagnostic purposes.

Diagnostic frames IDs are defined as listed below:

•

Master diagnostic frames: ID = 0x3C. These frames are sent by LIN master and they does not require

answer from communication slave.

•

Slave response diagnostic frames: ID = 0x3D. These frame are structured similarly to LIN TX frames: LIN

master sends the frame header and the slave is required to answer with data bytes.

Diagnostic frames featured into L9918 are described in the following paragraphs.

L9918

LIN Diagnostic frames

DS13000 - Rev 2

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