L9963E datasheet(39/184 Pages) STMICROELECTRONICS

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When disabling heartbeat mode (HeartBeat_En 1 è 0) or when moving to a low power state (GO2SLP),

L9963E switches immediately from TFIL_H_LONG to TFIL_H_SHORT. It is MCU responsibility to handle this transition

correctly, avoiding false FAULTH detection (see Figure 15 as an example).

Follow this procedure:

Send a broadcast frame with FaultH_EN = 0 and HeartBeat_En = 0 in order to disable both heartbeat and

fault receiver;

Wait for THB_CYCLE_000 (4 ms);

Send a broadcast frame with FaultH_EN = 1 to re-enable the fault receiver;

(Optional) Send the GO2SLP command.

Figure 15. False failure detection due to sudden heartbeat disable during the duty phase

4.3.4

Electrical parameters

All parameters are tested and guaranteed in the following conditions, unless otherwise noted:

9.6 V < VBAT < 64 V ; -40 °C < Tambient < 105 °C

Table 37. Heart beat electrical parameters

Symbol

Parameter

Test conditions

Min.

Typ.

Max.

Unit

THB_PULSE

High level HeartBeat Pulse

duration when HeartBeat

function is enabled

Tested by SCAN

500

μs

THB_CYCLE

Programmable HeartBeat

cycle duration

Tested by SCAN HeartBeatCycle = 000

Tested by SCAN HeartBeatCycle = 001

Tested by SCAN HeartBeatCycle = 010

Tested by SCAN HeartBeatCycle = 011

128

TFIL_H_SHORT

Tested by SCAN

300

μs

TFIL_H_LONG

Tested by SCAN

3.5

L9963E

FAULT line

DS13636 - Rev 12

page 39/184

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