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2.9 CAN Interface (P1 and CON23)
An isolated CAN interface is provided on a DB-9 connector as a provision that the user can implement in
firmware for additional system integration capability. The CAN interface is isolated from the control
common to improve noise immunity and provide system-level connection flexibility. CON23 is provided to
connect the CAN ground reference (GND_ISO) to another potential, such as earth ground, if desired to
provide different options for shielding the signals.
2.10 Control Power Input (CON2)
SpeedVal Kit only requires a single 12 VDC 3 A power supply for control power. The negative rail of the 12 V
supply is connected on the motherboard to Pin 3 of the connector. Pin 3 must be connected to earth ground
to prevent leakage currents from pulling the low-voltage side of the board away from the ground. The
current drawn from the power supply will vary based on the selection of gate driver cards, control board,
power daughter card, and test conditions.
2.11 Gate Driver Card Connectors
This section describes the interface between the gate driver card and the three-phase motherboard. A 16-
pin interface (CON15_x) on the input side of the gate driver card carries the input power, PWM signals, fault
signals, and other logic signals between the motherboard and gate driver. Table 11 lists the signals for this
16-pin interface.
PRD-08611 REV. 1, June 2024
© 2024 Wolfspeed, Inc. All rights reserved. Wolfspeed® and the Wolfstreak logo are registered trademarks and SpeedVal™ and
the Wolfspeed logo are trademarks of Wolfspeed, Inc. Other trademarks, product and company names are the property of their
respective owners and do not imply specific product and/or vendor endorsement, sponsorship or association.
Table 9: CAN connector pinout
Pin
Name/Description
1
No Connect
2
CAN_L
3
GND_ISO
4
No Connect
5
GND_ISO
6
No Connect
7
CAN_H
8
No Connect
9
+5V_ISO
M1/M2 GND_ISO
Table 10: Input power connector pinout
Pin
Name/Description
1
+12 V
2
12 V Common
3
Earth Ground
MOD-MB-3P-0900V-40A SpeedVal™ Kit Three-Phase Motherboard User Guide
Function
-
Bidirectional
Common
-
Common
-
Bidirectional
-
Power
Shield
Function
Power
GND
GND
21
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