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Pinouts of the CPU

Logitech wheels use a factory programmed version of the ST 72632 embedded processor. The chip has builtin USB controller and several A/D converters and I/O pins. You can find a datasheet of this chip from ST webpage.

Buttons are numbered from top to bottom on the table below.. So Left3 is the unused white button in the modified Momo wheel.

Pin number Momo function Force GP function
1 Vdd Vdd
2 OscOut OscOut
3 OscIn OscIn
4 Vss Vss
5 Gear+ Left1
6 Left1 Gear+
7 Left2 Gear-
8 /Reset /Reset
9 NC NC
10 Power enable NC
11 Pedals1 Pedals1
12 Test Test
13 Pedals2 Pedals2
14 LED1 Pedals3
15 Force control Force control
16 LED2 Pedals4
17 Steering input Steering input
18 Steering control Steering control
19 Power enable2 Power enable2
20 Force control Force control
21 Right1 Right2
22 Right2 Left2
23 Right3 Right1
24 Left3 Power enable
25 NC NC
26 NC NC
27 NC NC
28 Gear- NC
29 Force control? Force control?
30 Vssa Vssa
31 USBDP USBDP
32 USPDM USBDM
33 USBVcc USBVcc
34 Vdda Vdda

Pinouts of the white 11-pin connector in Momo Force:

Pin number Original function Modified function
1 Gear- NC
2 Left3 NC
3 Left2 Gear-
4 Left1 Gear+
5 Gear+ Left1
6 Right3 Right1
7 Right2 Left2
8 Right1 Right2
9 LED1 NC
10 LED2 NC
11 GND GND

Wire colours in the white connector:

Colour Function
Gray GND
Light blue LED2
Pink LED1
Brown Right2
White Left2
Purple Right1
Green Left1
Yellow Gear+
Red Gear-
Dark blue Right3
Black Left3

If you have any comments or suggestions, feel free to mail me at zuikkis@zuikk.is

– Zuikkis