L9966 datasheet(62/122 Pages) STMICROELECTRONICS

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Inductive sensor interface

The interface handles signals coming from inductive sensors or Hall Effect sensors. The interface feeds the digital

signal to microcontroller that extracts flying wheel rotational position, angular speed and acceleration.

15.1

VRS interface

VRS interface runs either in normal mode to convert the input differential voltage or in diagnostic mode to

detect eventual short to ground, short to battery or open condition at sensor pins. In order to guarantee a better

coverage, VRSP pin can be routed on AOX pin. Figure 32. VRS interface block diagram shows the main parts

inside VRS block and, in red, the internal connection in case of active diagnostic mode.

Figure 32. VRS interface block diagram

GADG1101180948PS

Operating mode is defined in VRS register through VRS_EN_DIAG bit: when VRS_EN_DIAG=0, VRS block is set

in normal mode; when VRS_EN_DIAG=1 the VRS diagnosis mode is activated.

VRSP or VRSN pins are equipped with a clamp at VclampH and VclampL.

In case of activation of clamp both on VRSP and VRSN, it is guaranteed by design that VRSP voltage is higher

than VRSN.

Table 45. VRS electrical parameters

Symbol

Parameter

Condition

Min

Typ Max Unit

UBSW = 7.5 V:36 V, VDD5V = 4.85 V:5.15 V, Tj-max = 150 °C unless otherwise specified.

VCM_norm Input common mode voltage level Open load

1.6

2.2

VRSP/VRSN

VclampH

Input signal high clamping voltage

NORMAL state

NORMAL state, max input current 20 mA

3.1

3.3

3.5

VRSP/VRSN

VclampH_OFF

Input signal high clamping voltage

OFF condition

VRSP/VRSN

VclampL

Input signal low clamping voltage

Max input current 20 mA

-1.5

-0.6 -0.3

VRSP/VRSN

L9966

Inductive sensor interface

DS12459 - Rev 10

page 62/122

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