L9966 datasheet(63/122 Pages) STMICROELECTRONICS

63 / 122 page

Symbol

Parameter

Condition

Min

Typ Max Unit

VclampL_OFF

Input signal low clamping voltage

OFF condition

Max input current 20 mA

-1.5

-0.6 -0.3

VRSP/VRSN

Rin CM

Input impedance

Equivalent resistance between VRSP/N and

Vcm_NORM (1)

100 140

kΩ

VRSP/VRSN

IBVRS

Input leakage current

VRSP/N = Vcm_NORM otherwise Rin_CM is

measured

µA

VRSP/VRSN

Voh

Output high voltage level

Iload = |2 mA|

VDD5-0.5

VRS_OUT

Vol

Output low voltage level

Iload = |2 mA|

0.5

VRS_OUT

Tdfalling

Delay between zero crossing of

the voltage differential VRSP and

VRSN to VRS_out

VRS_CONF_MODE[1]=’0’ (no Filter Time

inserted)

µs

VRS_OUT

Tdrising

Delay between zero crossing of

the voltage differential VRSP and

VRSN to VRS_out

Vdiff period = 4ms

VRS_CONF_MODE[1]=1 and VRS_SEL=1

(fully adaptive filter selected)

150

µs

VRS_OUT

VCM_diag

Diagnosis VRSP voltage

VRSP open, diag mode

0.9

1.1

1.3

VRSP

Idiag

Diagnosis current

VRSP open, VRSN short to GND, diag mode

µA

VRSP/VRSN

VOL

Open load threshold

Diag mode

2.65

2.80 3.0

VRSP/VRSN

VS2G

Short to ground threshold

Diag mode

1.15

1.25 1.35

VRSP/VRSN

VS2B

Short to battery threshold

Diag mode (=VclampH)

3.1

3.3

3.5

VRSP/VRSN

1. Guaranteed by design.

15.2

VRS - Normal mode

The VRS normal mode is set with VRS_EN_DIAG=0.

In Normal mode, the circuit can be configured as the one reported in Figure 33. VRS block diagram - Normal

operating mode. It allows decoding the VRS signal while flying wheel is in rotation.

Due to high variability of the input signal (±200 V), the input is clamped in the range [VclampH:VclampL] if the IC

is supplied or to VCLAMPH_OFF if the IC is not supplied; current through VRSP and VRSN is limited by external

resistor on each pin in order to allow the analog circuitry processing the signal itself. Moreover, the sensor input

pins have an input common mode, VCM_norm.

The preconditioned input signal is then processed by a zero-crossing comparator, which toggles at each transition

of the input signal.

L9966

VRS - Normal mode

DS12459 - Rev 10

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