AN1596 datasheet(21/24 Pages) STMICROELECTRONICS

tên linh kiện	AN1596

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AN1596 - APPLICATION NOTE

APPENDIX

Symptom

Component

Schematic

Notes

Input and

Status pins

R1, R2, Rpu

R1, R2 and Rpu chosen in

order to limit the control pins

currents to 10mA.

R1 and R2 must protect the

microcontroller against the

latch-up (see point 6, 7).

Off-State open

load detection

in digital HSDs

(case 1)

Rpu

Choose Rpu in order not to

have

false

open

load

detection:

VOUT=(Vpu/(RL+Rpu))•

RL<VOLmin

Choose

Rpu

assure

detection

when

load

disconnected:

Rpu<(Vpu–VOLmax)/IL(off2)

VOLmin, VOLmax, IL(off2) are

given in datasheets.

Off-State open

load detection

in digital HSDs

(case 2)

Rpu, R1, R2,

T1, T2

minimize

power

consumption,

the

microcontroller

can

periodically switch on T1

and T2 when the ignition key

is inserted.

DRIVER

LOGIC

INPUT

STATUS

VCC

OUT

GND

+ 5V

Rpu

LOAD

V OL

Vpu

R pu

10k

Ω

DRIVER

LOGIC

INPUT

STATUS

VOUT

GROUND

VCC

IL(off2)

VOL

V CC.

Vpu

R pu

10k

Ω

DRIVER

LOGIC

INPUT

STATUS

V CC

VOUT

GROUND

µ P

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