L9177A datasheet(21/55 Pages) STMICROELECTRONICS

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2.5.16

Variable reluctance sensor interface

Table 21. Variable reluctance sensor interface electrical characteristics

Symbol

Parameter

Condition

Min

Typ

Max

Unit

VHTH

Input high to low differential threshold

voltage at VRIN+ and VRIN- nodes

-50

VCM

Common mode operating range at

VRIN+ and VRIN-

1.5

Vcm_internal Internal common mode voltage

Switch off hysteresis current

0.27*VDD 0.3*VDD 0.33*VDD

Vdiagth_H (1) Diagnostic high threshold

Diagnostic voltage referred to VRIN- (see

Figure 14)

0.67*VDD 0.75*VDD 0.82*VDD

Vdiagth_L (1) Diagnostic low threshold

0.18*VDD 0.2*VDD 0.22*VDD

Idiag

Diagnostic current

Current from VRIN- when diagnostic on

µA

Rinternal_

common

Internal common mode resistor

Switch off hysteresis current

200

350

kΩ

IIB

Input bias current

VRIN+ = VRIN- = 1.5 V

µA

Ileak

Output leakage

VROUT = 5 V

µA

VCLPH

Input high clamping voltage

VRIN+ = |VRIN-| = 20 mA

VCLPL

Input low clamping voltage

VRIN+ = |VRIN-| = |20 mA|

-1.5

-0.3

tof

Output fall time

CLOAD= 20 pF, RLOAD = 5 kΩ

300

tof_1nf

Output fall time

CLOAD= 1nF

1.5

µs

VOUTL

Output buffer low voltage

Isink= 2 mA

0.6

IOUTL

Output current capability

Vout= 0.6 V

tprop

Propagation delay

VRS INM = 0.5 V, INP applied to 1 V to make

VRS OUT commuted

0.1

0.45

0.8

µs

Tdgc_VRS OFF Diagnostic Deglitch filter time

Guaranteed by scan

µs

1. if (VRIN- > Vdiagth_H) or (VRIN- < Vdiagth_L) then Fault is detected.

L9177A

Electrical characteristics

DS12175 - Rev 5

page 21/55

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