L9918 datasheet(45/109 Pages) STMICROELECTRONICS

45 / 109 page

Please note that the provided new PIDs shall be compliant with parity calculation rule stated by LIN DLL

standards.

A response shall only be sent if the NAD matches. If successful, L9918 sends below Slave response frame (ID =

0x3D):

Table 35. Response frame

Byte 0

Byte 1

Byte 2

Byte 3

Byte 4

Byte 5

Byte 6

Byte 7

NAD

0x01

0xF7

0xFF

Notes:

•

The assign frame ID range service is only supported in LIN DLL versions newer than 2.1. Users should

configure the Assign Frame ID feature with LIN21_SOFTID_DIS.

•

New PIDs assigned can’t be stored into NVM. They will be lost after POR (i.e. new wakeup) event.

5.5

LIN Fault detection

5.5.1

Mechanical fault (F_M)

When regulator is in pre-excitation mode F_M flag is set to ‘1’. F_M fault is configured by MECH_ESAUS_DIS

and MASK_FMECH NVM bits.

Table 36. F_M configuration

MECH_ESAUS_DIS

MASK_FMECH

Mechanical fault behavior

F_M = 1

F_M is set to 1 just in case VBSPLINRG > VB+ and VBSPLINRG ≠10.6 V

F_M is set to 1 just in case VBSPLINRG ≠ 10.6 V

F_M is set to 1 just in case VBSPLINRG>VB+ and VBSPLINRG ≠10.6 V

5.5.2

Electrical fault (F_E)

F_E fault signal passes through a digital filter TflagOn. This deglitch time can be selected by LAMP_FILT NVM

bits. It has been introduced in order to avoid false indication problems.

Table below lists the possible cases leading to a F_E flag and the correspondent NVM programming.

Table 37. Electrical fault cases

Case

Required NVM programming

Notes

Duty commanded to 0% and VEXC>Vfondet

Short-to-battery

PH voltage below KLV_USSW/KLV_NRSW

EXC DC = 100%

ANZ_U_LOW1

PH voltage below KLV_USSW/KLV_NRSW

N < Nstart

ANZ_U_LOW2

EXC current below 500 mA - EXC_DC > 40%

ANZ_FES

Open load

B+ above VB+_LIM

ANZ_OV_LIM

Overvoltage

B+ above U_FELD_AUS

ANZ_OV_EN

Overvoltage

B+ below 11.3 V

N > LRC-cut speed

ANZ_GMUS_EN

L9918

LIN Fault detection

DS13000 - Rev 2

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