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L9788 Datasheet(PDF) 142 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) 142 Page - STMicroelectronics

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Inductive sensor interface
L9788
142/264
DS12308 Rev 4
As per VRS_A architecture, EN_FALLING_FILT allows configuring the same two different
strategies for the filtering algorithm.
11.3
VRS diagnostic mode
The diagnostic mode is selected through VRS_DIAG = '1' in CONFIG-REG8. This mode
provides feedback to detect faulty conditions either on FLW_IN_P or FLW_IN_N.
To be noted that diagnostic results are not reliable while the flying wheel is rotating.
If a fault is detected in DIAG mode, VRS correct functionality is not guaranteed. Fault bit
VRS_DIAG of VRS register is consequently set.
Figure 61 shows the circuit used ikn Diagnostic mode. When VRS diagnostic mode is
activated, FLW_IN_P is fixed at Vcm_DIAG and IDIAG current generator is enabled, the
current path is that one in green in Figure 61.
Figure 61. VRS block diagram - Diagnostic operating mode - Current path
11.4
Application circuit
Sensor sketch and parameters are reported in Figure 62 and Table 61.
Figure 62. Sensor sketch
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
GADG0612161457PS
Vcm_DIAG
VRS_DIAG=1
I_DIAG
DIAG
GAPGPS00571
IN +
VRS
IN -
Rs
Ls



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