L9678P datasheet(193/215 Pages) STMICROELECTRONICS

193 / 215 page

DS11626 Rev 9

193/216

L9678P, L9678P-S

Electrical characteristics

214

16.17.2 Squib/pyroswitch leakage test (VRCM)

All electrical characteristics are valid for the following conditions unless otherwise noted.

-40 °C  Ta  +95 °C, VINGOOD1(max)  VIN  35 V,

VDD3V3(min)  VDD3V3  VDD3V3(max).

ISRC_DELTA

Squib/pyroswitch

Resistance

Measurement

Delta Current Source

-5%

+5%

SRISRC

Squib/pyroswitch

resistance

measurement

current source slew-

rate

7.5

mA/µs

VSRx_RM

SRx voltage during

Resistance

Measurement

LPDIAGREQ(ISRC) = ”01” or “10”

LPDIAGREQ(ISINK) = 1

0.5

0.7

ISINK_HI_SR

SRx current sink limit

high level

LPDIAGREQ(ISRC_CURR_SEL) = 0

LPDIAGREQ(ISINK) = 1

ISINK_LO_SR

SRx current sink limit

low level

LPDIAGREQ(ISRC_CURR_SEL) = 1

LPDIAGREQ(ISINK) = 1

17.5

IPD_SR

SRx current pull down -

0.7

1.3

RLKG_SF

Leakage resistance on

SFx

Leakage to GND ±1 V or to Battery

from 6 V to 18 V. Design info

kΩ

RSQ_ACC

Accuracy of digital

resistance

measurement

After software calculation

All errors included

RSQ between 1.0 Ω and 10.0 Ω

With High Current Source (40mA)

-8

EMI Input Low-pass

filter

Design Info

100

kHz

Table 49. Deployment drivers diagnostics (Squib/pyroswitch resistance) (continued)

N°

Symbol

Parameter

Condition

Min. Typ. Max.

Unit

Table 50. Squib/pyroswitch leakage test (VRCM)

N°

Symbol

Parameter

Condition

Min.

Typ.

Max. Unit

VOUT_VRCM

Output Voltage on SF or

SR pins during Leakage

test

IOUT = 0 mA

-10%

2.5

+10%

IOUT = 6.6 mA

-8.7%

2.3

+8.7%

RLKG_GSQ_TH

Detection threshold,

leakage to GND

Leakage detected if

RLKG_GSQ  1 kΩ and not

detected if RLKG_GSQ  10 kΩ

Design Info

kΩ

ILKG_GSQ_TH

Equivalent to resistance

range

-15%

450

+15%

µA

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