L9965P datasheet(34/104 Pages) STMICROELECTRONICS

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Symbol

Parameter

Test condition

Min

Typ Max

Unit

tON_FAULT_1H

FENH/FENL valid on-

time range for high

signal at low PWM

FENx_MODE = 1, FENx_FREQ

= 1 and FENx_LEVEL = 1

34.3 46.9 64.7

µs

FENH,

FENL

tFENx_TIMEOUT

FENH/FENL timeout for

integrity check in level

mode

FENx_MODE = 0

1.75

2.25

FENH,

FENL

tDEPLOY_DELAY_00

FENH/FENL deploy

trigger delay

FENX_DLY_CFG = 00

FENH,

FENL

tDEPLOY_DELAY_01

FENX_DLY_CFG = 01

1.8

2.2

FENH,

FENL

tDEPLOY_DELAY_10

FENX_DLY_CFG = 10

3.6

4.4

FENH,

FENL

tDEPLOY_DELAY_11

FENX_DLY_CFG = 11

7.2

8.8

FENH,

FENL

3.6.2

Power stage (PS/PF/PR/PGND)

The power stage is made of two power switches whose actuation is triggered by two independent paths, as

shown in the Figure 10.

The Figure 16 shows the equivalent load model of a pyro-fuse igniter input. The following circuit have been

considered when performing power stage diagnostics and deployment simulations.

Figure 16. Pyro-fuse input model

RPYRO

RWIRE/2

CPF

RWIRE/2

LWIRE/2

LEMI

CPR

CPYRO

3.6.2.1

Active pull-down on LS

A pull-down current generator (IACT_PD_PR) is present on PR pin to have a minimum current-limited pull-down

path to PR and PF pin. The circuit is connected between PR pin force pad and GND pin. As a diagnostic resource

is enabled, the pull-down generator is automatically disabled. It is possible to force the disable state of the pull-

down generator using the PR_PD_DIS bit located in the INTERNAL_CFG register.

3.6.2.2

LS driver deactivation delay

A delay tLS_OFF_DEACT is implemented in the LS driver deactivation with respect to HS driver to:

•

Limit the LS recirculation energy after fire to ELS_CLAMP;

•

Protect the device pins against voltage spikes at the end of a deployment event, clamping the voltage to

VLS_CLAMP.

No equivalent delay is applied at deployment event start.

3.6.2.3

Pyro-fuse deployment profile

The HS power-stage features a current controlled powerMOS supporting flexible deployment profiles. It is

possible to configure both the current level and the duration:

•

The I_DEPLOY_CFG field selects the target deploy current level;

•

The T_DEPLOY_CFG field selects the target deploy time.

L9965P

Functional description

DS14702 - Rev 4

page 34/104

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