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L9788 Datasheet(PDF) 135 Page - STMicroelectronics

Part # L9788
Description  Multifunction IC for automotive engine management system
PDF  264 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

L9788 Datasheet(HTML) 135 Page - STMicroelectronics

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DS12308 Rev 4
135/264
L9788
Inductive sensor interface
263
11
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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