L9963E datasheet(38/184 Pages) STMICROELECTRONICS

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For all other units, the detection criteria are adapted to the FAULT line configuration programmed by

HeartBeat_En bit, as shown in the table below.

Table 35. FAULTH filtering strategies

L9963E State

Configuration

Fault detection condition

Description

Normal

HeartBeat_En = 1

FAULTH = 1 for t > TFIL_H_LONG

Static ‘1’ detected on FAULTH pin,

FaultHline_fault = 1

FAULTH = 0 for t > 1.2*THB_CYCLE

Absence of heartbeat from upper device,

HeartBeat_fault = 1

HeartBeat_En = 0 FAULTH = 1 for t > TFIL_H_SHORT

High logic level detected on FAULTH pin,

FaultHline_fault = 1

Sleep, Silent

Balancing, Cyclic

Wakeup

HeartBeat_En = X FAULTH = 1 for t > TFIL_H_SHORT

High logic level detected on FAULTH pin,

FaultHline_fault = 1

The MCU at the bottom of the chain is supposed to adopt the filtering strategy described in Table 35 for failure

detection.

Summary of L9963E fault line configurations is available in the following table:

Table 36. Summary of L9963E FAULT line configurations

FaultH_EN HeartBeat_En Farthest_Unit

L9963E behavior

Optimized for

FAULTH receiver disabled. The FAULTH line pin is

considered Low whatever its value is.

FAULTL operates in static logic mode and can be set

static high by internal fault only

Topmost unit of the

chain in static logic

value configuration

FAULTH receiver disabled. The FAULTH line pin is

considered Low whatever its value is.

FAULTL operates in heartbeat mode and can be set

static high by internal fault only

Topmost unit of the

chain in heartbeat

configuration

FAULTH receiver enabled with short filter

(TFIL_H_SHORT) because HeartBeat signal is not

possible.

FAULTL operates in static logic mode and can be set

static high by both external and internal fault

Unit in the middle of

the chain or transceiver,

in static logic value

configuration

FAULTH receiver disabled. The FAULTH line pin is

considered Low whatever its value is, because the

Farthest Unit considers FaultH_EN = 0 whatever

FaultH_EN value is.

FAULTL operates in static logic mode and can be set

static high by internal fault only

Topmost unit of the

chain in static logic

value configuration

FAULTH receiver enabled with long filter

(TFIL_H_LONG) because HeartBeat signal is possible

FAULTL operates in heartbeat mode and can be set

static high by both external and internal fault

Unit in the middle of the

chain or transceiver, in

heartbeat configuration

FAULTH receiver disabled. The FAULTH line pin

is considered Low whatever its value is because

the Farthest Unit always considers FaultH_EN = 0

whatever FaultH_EN value is.

FAULTL operates in heartbeat mode and can be set

static high by internal fault only

Topmost unit of the

chain in heartbeat

configuration

L9963E

FAULT line

DS13636 - Rev 12

page 38/184

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