Nominal Range is the absolute value in volts of the full, peak-to-peak nominal range of
the channel, and
Resolution is the resolution of the ADC or DAC in bits (Resolution = 12)
For AI and AO channels on the MXP connectors,
LSB Weight = 5 � ÷ 2
12
= 1.221 ��
Maximum Reading = 4095 × 1.221 �� = 4.999 �
DIO Lines
The NI ELVIS RIO CM provides 3.3 V general-purpose DIO lines on the MXP connectors.
DIO <13..0> on the MXP have 40 kΩ pull-up resistors to 3.3 V, as shown in the following
figure.
Figure 5. DIO Lines with 40 k
Ω
Pull-up Resistors to 3.3 V
40 k
Ω
DIO/CS
+3.3 V
FPGA
Bus Switch
DIO <15..14> on the MXP have 2.2 kΩ pull-up resistors to 3.3 V, as shown in the following
figure.
Figure 6. DIO Lines with 2.2 k
Ω
Pull-up Resistors to 3.3 V
2.2 k
Ω
FPGA
Bus Switch
DIO/SCL/SDA
+3.3 V
You can program all MXP DIO lines individually as inputs or outputs. Secondary digital
functions include SPI, I
2
C, PWM, and quadrature encoder input.
Note
For information about configuring the behavior of the DIO lines, visit
and enter the Info Code
elvisriocmhelp
.
When a DIO line is floating, it floats in the direction of the pull resistor. A DIO line may be
floating in any of the following conditions:
•
When the NI ELVIS RIO CM device is starting up.
•
When the line is configured as an input.
•
When the NI ELVIS RIO CM device is powering down.
You can add a stronger resistor to a DIO line to cause it to float in the opposite direction.
NI ELVIS RIO CM User Manual
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© National Instruments
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