Converting Raw Data Values To Voltage; Dio Lines - NI myRIO-1900 User Manual And Specifications

Converting Raw Data Values to Voltage

You can use the following equations to convert raw data values to volts:
where Raw Data Value is the value returned by the FPGA I/O Node,
LSB Weight is the value in volts of the increment between data values,
Nominal Range is the absolute value in volts of the full, peak-to-peak nominal range
of the channel,
and ADC Resolution is the resolution of the ADC in bits. (ADC Resolution = 12.)
• For AI and AO channels on the MXP connectors,
• For AI and AO channels on the MSP connectors,
Maximum Positive Reading = +2047 * 4.883 mV = 9.995 V
Maximum Negative Reading = -2048 * 4.883 mV = -10.000 V
• For Audio In/Out,
Maximum Positive Reading = +2047 * 1.221 mV = 2.499 V
Maximum Negative Reading = -2048 * 1.221 mV = -2.500 V
• For the accelerometer,
Maximum Positive Reading = +2047 * 3.906 mg = +7.996 g
Maximum Negative Reading = -2048 * 3.906 mg = -8.000 g

DIO Lines

The NI myRIO-1900 has 3.3 V general-purpose DIO lines on the MXP and MSP connectors.
MXP connectors A and B have 16 DIO lines per connector. On the MXP connectors, each DIO
line from 0 to 13 has a 40 kΩ pullup resistor to 3.3 V, and DIO lines 14 and 15 have 2.2 kΩ
pullup resistors to 3.3 V. MSP connector C has eight DIO lines. Each MSP DIO line has a 40 kΩ
pulldown resistor to ground. DGND is the reference for all the DIO lines. You can program all
the lines individually as inputs or outputs. Secondary digital functions include Serial Peripheral
10 | ni.com | NI myRIO-1900 User Guide and Specifications
V = Raw Data Value * LSB Weight
LSB Weight = Nominal Range ÷ 2
LSB Weight = 5 V ÷ 2
Maximum reading = 4095 * 1.221 mV = 4.999 V
LSB Weight = 20 V ÷ 2
LSB Weight = 5 V ÷ 2
LSB Weight = 16 g ÷ 2
ADC Resolution
12 = 1.221 mV
12
= 4.883 mV
12
= 1.221 mV
12
= 3.906 mg