Output Channels; Communication Channels - Bosch DDU 8 Manual

Bosch Motorsport
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Display brightness switch
Pin 37 of the life connector is used as a dimmer switch for the display. The inter‐
nal pull‐up resistor is automatically activated. Different dim settings are selected
by a connecting the pin to SENSGND with different resistor values over a 6 posi‐
tion switch. The individual brightness settings for LEDs and the display are de‐
fined by RaceCon.
Dim Level
Level 1
Level 2
Level 3
Level 4
Level 5
Level 6
5.2

Output channels

PWM output
The DDU 8 has 4 low side switch outputs controlled by pulse width modulation
(PWM). Each switch is rated 2 A max current. Maximum PWM switch frequency is
8 kHz with a 0 to 100 % duty cycle. Each output is short circuit protected to GND
and battery voltage. It is mandatory to connect the LS_PWM pins to vehicle GND
as indicated in the circuit diagram when using the PWM outputs.
Sensor power supply
The DDU 8 has 3 types of sensor power supply: 12 V unregulated battery voltage,
5 V and 10 V regulated voltage. The 12 V unregulated output is fused and rated
1 A max. The regulated 5 V and 10 V outputs can deliver 350 mA each. They are
short circuit protected to battery voltage and GND.
5.3

Communication channels

CAN bus
The DDU 8 has 2 CAN buses configurable as input and output. Different baud
rates are selectable. Please note that the DDU 8 does not contain any CAN termi‐
nation resistors. Thus the CAN termination resistors need to be integrated into
the wiring loom.
DDU 8 Manual
Inputs and Outputs | 5
Resistor Value
3,830 Ohm
6,980 Ohm
23,200 Ohm
Resistor Value
43.9 Ohm
142 Ohm
264 Ohm
409 Ohm
609 Ohm
846 Ohm
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