DRM33395 Designer Reference Manual
33395 Evaluation Motor Board
24
Pin Descriptions
Pin Descriptions
3.3.5 Test Points
Ten test points provide easy access to the power supply, reference
voltages and other circuits. They are listed in
Table 3-5
with their
descriptions and locations. Additional test points appearing left of the
UNI-3 connector are numbered adequately to UNI-3 pin numbers and
explained in
Table 3-1
.
Table 3-5 Test Points
Point
No.
Signal Name
The Test/Measurement point is connected to:
Location
1
DCB_POS (MP1) the +12-volt motor bus
above green LED diode
2
GND (MP2)
the 12-volt power supply and motor bus ground
below J2 - motor connector
3
+5V_D (MP3)
the 5-volt digital power supply voltage
above UNI-3 connector
4
+3.3V_A (MP4)
the 3.3-volt analog power supply voltage
on top right corner
5
GND (MP5)
the 12-volt power supply and motor bus ground
on top left side of UNI-3
connector
6
GNDA (MP6)
the analog ground
in the middle, above SMOS
7
1.65VREF
the 1.65-volt analog reference voltage
above MP3, below MP4
8
DCB_HALF
Back-EMF zero crossing circuitry
right of MP1, below SMOS
9
BRAKE
the gate of the brake’s transistor
above MP1
10
l_reconst (TP22)
pin 22 of UNI-3 connector, see
Table 3-1
left of trimmer and MP3
