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L9300 Fiches technique(PDF) 34 Page - STMicroelectronics

No de pièce L9300
Description  Automotive flexible U-chip for braking and transmission
PDF  178 Pages
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Fabricant  STMICROELECTRONICS [STMicroelectronics]
Site Internet  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

L9300 Fiches technique(HTML) 34 Page - STMicroelectronics

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VDA sensor decoding
For the three level wheel speed sensor, additional information is Manchester encoded between two consecutive
speed pulses.
The device measures each speed pulse duration and its value is used as time base for Manchester decoder
which provides decoding for the bit [0:8] shown in the figure below. The number of the data log bit depends on the
speed so that the device is able to inform the microcontroller about the number of bit effectively received.
Figure 18. Definition of speed pulse and data log bits
South Terminal
North
Terminal
North
Terminal
Initial bit
Speed
pulse
Data log bits
0
1
2
3
4
5
6
7
8
I_mid(2XI-low)
I_high(4XI-low)
I_low(7mA)
GADG1307171618PS
Normal sensor operation
Normal operation frames are composed as shown in the figure below.
Figure 19. Signal monitoring: normal speed
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
GADG1407170832PS
L9300
Power supply
DS12258 - Rev 5
page 34/178



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