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EVDP610
running after establishing communication. This
assures that both the board and the software are
initialized into the same states to avoid confusion.
2. Make sure that the board is in 8 bit resolution mode
by checking the resolution button (8 bit resolution is
the board's default state). Flip the switch in the
Pulse Settings area so that the pulse width test box
is now no longer dimmed. Enter a number into this
text box between 0 – 255. The duty cycle textbox
will change accordingly although it will remain
dimmed until the switch is toggled, ie: if you enter a
128, the duty cycle will read 50%.
2.0 GENERAL DESCRIPTION AND THEORY OF
OPERATION
For circuit design information, refer to the EVDP610
schematic and PCB layout drawing in Figures 7 and 8.
In this manner the user can easily set pulse width, dead
time, resolution, among other functions such as dividing
the clock signal.
2.2 IXDP610 IC
The IXDP610 chip, labeled U1 on the evaluation board,
generates two complementary non-overlapping, pulse
width modulated signals for direct digital control of a
switching power bridge.
2.2.1 Dead Time
The PWM waveform generated by the IXDP610 results
from comparing the output of the Pulse Width counter to
the number stored in the Pulse Width Latch. A program-
mable “dead-time” (defined as t DT in Fig.4) is incorporated
into the PWM waveform. The Dead-Time Logic disables
both outputs on each transition of the comparator output
for the required dead-time interval. This feature is difficult
to duplicate in equivalent analog system.
2.1 Serial Communications
The RS-232 communications interface allow the
EVDP610 to communicate and respond to commands
through a serial port. The serial bus operates at 9600
baud and is buffered by an RS232 driver before reaching
the microprocessor. For more specific information on
the serial protocol please see Section 4.
To communicate with and control the EVDP610 Board, a
null modem cable (included) must be connected from a
PC’s serial port to the male DB9 connector on the board.
For user reference a pin out of the cable is shown in
Figure 3. Once the correct communications port is
selected, the user can run all of the features of the
IXDP610 chip from the GUI.
Figure 4: Output Waveform Displaying Dead-Time
For example, in a half bridge system the dead time can
prevent two transistors being on at the same time. If both
transistors are on for a short period of time, they could
effectively short the voltage supple to ground, which is an
undesirable situation.
2.2.2 Lock Bit
Setting the lock bit of the IXDP610 prevents all writes to
the control latch except for the Stop bit. This locking
feature prevents modification of the control latch due to
software error, preventing damage to the system being
controlled by the IXDP610. This prevents changing of the
dead-time, clock divide, and resolution settings.
Female DB9
Female DB9
Description
(computer)
Pin 2
Pin 3
Pin 5
(EVDP610 board)
Pin 3
Pin 2
Pin 5
TX
RX
GND
2.2.3 Clock Divide Bit
This feature allows the IXDP610 to divide the input clock
by one or divided by two.
2.2.4 Resolution
Figure 3 - Null Modem Cable Pin-Out
The GUI software allows the user to set all functions
provided on the IXDP610 with the simple click of a button
or writing into a text box.
2
The IXDP610 can run in two resolution modes, 8-bit and
7-bit. Choosing 7-bit resolution doubles the achievable
PWM base frequency at the expense of decreased duty
cycle resolution. With the combination of the Divide bit
(labeled Clock Divide on the GUI) and the resolution bit,
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