L9788 datasheet(135/264 Pages) STMICROELECTRONICS

135 / 264 page

DS12308 Rev 4

135/264

L9788

Inductive sensor interface

263

Inductive sensor interface

The interface handles signals coming from magnetic pick-up sensors or Hall Effect sensors.

The interface feeds the digital signal to microcontroller that extracts flying wheel rotational

position, angular speed and acceleration.

11.1

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. Figure 55 shows the main parts inside VRS block and, in red, the internal

connection in case of diagnostic mode active.

Figure 55. VRS interface block diagram

Operating mode is defined in VRS register through VRS_DIAG in CONFIG_REG8 bit: when

VRS_DIAG=0, VRS block is set in normal mode; when VRS_DIAG=1 the VRS diagnosis

mode is activated.

If L9788 is supplied and VRS is running, in case FLW_IN_P or FLW_IN_N voltage rises their

values are clamped at VclpH.

In case of activation of clamp both on FLW_IN_P and FLW_IN_N, it is guaranteed by design

that FLW_IN_P voltage is higher than FLW_IN_P.

FLW_IN_N

FLW_IN_P

VRS_HYST_FB

MSC

Filter Time

HYSTERESIS

SELECTOR

SENSOR

VRS

LIMITED / FULLY

ADAPTIVE

MANUAL

VRS_CONF_

MODE_1

FLW_OUT

VRS_FB

DIAG

GADG0612160835PS

VRS_DIAG=1

I_DIAG

Vcm_DIAG

Vcm NORM

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