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L9300 Datasheet(PDF) 35 Page - STMicroelectronics

No. de pieza L9300
Descripción Electrónicos  Automotive flexible U-chip for braking and transmission
PDF  178 Pages
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Fabricante Electrónico  STMICROELECTRONICS [STMicroelectronics]
Página de inicio  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

L9300 Datasheet(HTML) 35 Page - STMicroelectronics

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High-speed operation
The number of datalog bit is reduced at high-speed operations (see next figure). There are four dedicated bits on
the SPI WSIRSDRx register which show how many valid bits are coming from the VDA sensor.
Figure 20. Signal monitoring: high Speed
bit 0 bit 1 bit 2 bit 3 bit 4 bit 5
tp/2
tp/2
tp
tp
tp
tp
tp
tp
tp
1
1
0
1
1
0
Initial bit
Speed pulse
Sensor output
Current
Data log
Speed pulse
t_mc
_if
GADG1407170839PS
Standstill operation
The ASIC is able to understand whether the VDA sensor is in standstill mode. Standstill operation frames are
composed as shown in the next figure. In this case the speed pulse is not modulated at current level I_high but a
level I_mid is used.
The expected number of transmitted datalog bit is equal to 9 but no automatic check is performed.
Figure 21. Signal monitoring: standstill
bit 0 bit 1 bit 2 bit 3 bit 4 bit 5 bit 6 bit 7 Parity
tp/2
tp/2
tp
tp
tp
tp
tp
tp
tp
tp
tp
tp
1
1
0
1
1
0
1
0
1
Initial bit
Speed pulse
Sensor output
Current
Data log
Speed pulse
t_stop
GADG1407170854PS
Start & stop condition for data decoding
According to the sensor status, the starting and the end point for decoding the VDA data can slightly vary. The
different behaviors are summarized by the table below.
L9300
Power supply
DS12258 - Rev 5
page 35/178



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