L9918 datasheet(46/109 Pages) STMICROELECTRONICS

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Case

Required NVM programming

Notes

Battery under voltage (U_FELD_EIN threshold)

ANZ_LV_EN

Undervoltage

Overcurrent detected (EXC current > IFOCP)

OVC_FLAG_EN

Short-to-GND

5.5.3

Thermal fault (F_T)

A thermal fault is flagged when thermal compensation starts to operate (see Section 2.2.3 ).

5.5.4

LIN Timeout flag (F_L0)

Time between two consecutive valid messages must be faster than tLIN_COM. If this time is elapsed, the TO flag is

raised.

5.5.5

LIN Communication fault flags (F_L1, F_LB, F_LP, F_LC, F_LE)

Some LIN configurations provide error flags by which the LIN communication integrity can be checked. In some

configuration all LIN error flags are aggregated into one flag only (F_L1) while in other configurations it is possible

to check separately various requirements of the LIN communication (F_LB, F_LP, F_LC, F_LE).

LIN communication error flag

•

F_LC: Checksum error detected: A checksum error is detected

•

F_LP: ID parity error detected: The parity field (P0 and P1) of a known identifier is wrong

•

F_LB: Inconsistent Break Field Error: Edges of the BREAK (or SYNCH-BREAK) field are detected outside

the given tolerances

•

Stop bit detected: LIN bus line is dominant while stop bit

•

“Bit error” detected: The received bit is different from the bit sent

All these faults are aggregated into F_L1 flag. F_L1 flag rises at the occurrence of any of the listed cases.

5.5.6

LRC flag (F_H)

The LRC flag is set to 1 when LRC is active. This feature is enabled by programming LRC_IEXC_FLAG_EN NVM

bit.

5.5.7

Excitation current limitation flag (F_G)

Excitation current limitation flag is flagged as soon as the current limitation is activated.

Excitation current limitation flag is set to ‘1’ even if a “No limitation command is sent by LIN”

This flag has to be enabled by NVM bit LRC_IEXC_FLAG_EN.

Please note that Excitation current limitation flag is exclusively related to current limitation threshold commanded

by LIN. It is not applied to the default threshold programmed into the NVM.

In other words, in case EXC current is limited to the threshold provided by LIN communication, the flag is set high.

In case EXC current is limited to the default value given by IFELD_MAXB and I_MAX NVM registers, I_EXC flag

remains low.

L9918

LIN Fault detection

DS13000 - Rev 2

page 46/109

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