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2.14 Serial 10-bit 4-channel D/A Converter
The DSP56F807EVM board contains a serial 10-bit, 4-channel D/A converter connected
to the DSP56F807's SPI port. The output pins are uncommitted and are connected to a
4X2 header, J26, to allow easy user connections. Refer to
connections and
Table 2-8
value can be set to a value from 0.0V to 2.4V by a trimpot, R97. This trimpot is preset to
+2.05V which provides approximately 2mV per step.
DSP56F807
Figure 2-10. Serial 10-bit, 4-Channel D/A Converter
2.15 Motor Control PWM Signals and LEDs
The DSP56F807 has two independent groups of dedicated PWM units. Each unit contains
six PWM, three Phase Current sense and four Fault input lines. PWM group A's PWM
lines are connected to the UNI-3 interface connector and to a set of six PWM LEDs via
inverting buffers. The inverting buffers are used to isolate and drive the DSP's PWM
2-18
for the header's pin out. The D/A's output full-scale range
MAX5251
MOSI
DIN
OUT A
MISO
DOUT
OUT B
SCLK
SCLK
OUT C
OUT D
PB4
CS
RSTO
CL
Table 2-8. D/A Header Description
Pin #
Signal
1
D/A Channel 0
3
D/A Channel 1
5
D/A Channel 2
7
D/A Channel 3
DSP56F807EVM Hardware User's Manual
Figure 2-10
D/A CONNECTOR
J26
D/A 0
1
D/A 1
3
D/A 2
5
D/A 3
7
Vref
R97
+3.3VA
10K
J20
Pin #
Signal
2
AGND
4
AGND
6
AGND
8
AGND
for the D/A
2
4
6
8
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