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Setup and Using the Hardware
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Setup and Using the Hardware
Warning: Always wear Safety Glasses when working around electronic modules and when soldering.
The EVB is provided to quickly evaluate features of the MC33887 device with a simple bench-top setup. In
order to perform the demonstration examples, first set up the evaluation board hardware and software as
follows:
1. Terminal blocks are provided for easy hook-up of power and loads. Strip wire about 0.25" before
inserting into terminal block, then tighten down the screw until the wire is snug. Apply a voltage between
5V and 35V to the terminal labeled "12 Vin", and apply the ground return to the terminal labeled "GND".
The board has a built-in 5V regulator, and up to 500mA may be drawn from the terminal labeled 5Vout,
if desired.
2. Jumpers are provided at the I/O 2x8 pin header to provide quick set-up of the enable, disables, and
inputs. Alternatively, an uncommitted 2×20 pin header is provided to which the I/O may be
wire-wrapped in any desired pinout. This 2×20 pin header will then accept standard 40-pin flat ribbon
cables to provide connection to various Metrowerks Development Systems.
3. To turn on a load in one direction, the inputs should be set as follows: D1 to ground, D2 to +5V, EN to
+5V, IN1 to +5V (or left floating, as it has internal pull-ups to +5V), and IN1 to ground. To run current
through the load in the opposite direction, reverse the logic states of IN1 and IN2. (Note: Logic One >
3.3V, Logic Zero <1.4V.)
4. To control the load via PWM, apply a PWM pulse train to either IN1 or IN2, while holding the other input
at a steady-state logic level. Swapping the signals applied to IN1 and IN2 will provide control in the
opposite direction.
5. A Fault Status indicating LED is included on the board, and can be connected to the Fault Status flag
output by placing a jumper over the two pins opposite the FS label on the 2×8 pin header. By so doing,
the FAULT LED will light whenever the IC encounters any of the following fault conditions: Over
Temperature, Shorted Load, Under Voltage. The LED will remain lit until the IC's fault status flag is
reset by one of the following means: toggling D1, toggling D2, toggling EN, or removing then
reapplying power.
KT33887UG User’s Guide Rev. 2.0 4/2013
Freescale Semiconductor
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