NI myRIO-1900 User manual

USER GUIDE AND SPECIFICATIONS
NI myRIO-1900
The National Instruments myRIO-1900 is a portable reconfigurable I/O (RIO) device that
students can use to design control, robotics, and mechatronics systems. This document contains
pinouts, connectivity information, dimensions, mounting instructions, and specifications for the
NI myRIO-1900.
Figure 1. NI myRIO-1900
1NImyRIO-1900
2myRIOExpansionPort(MXP)Breakouts(One
Included in Kit)
3 Power Input Cable
4USBDeviceCable
5USBHostCable(NotIncludedinKit)
6LEDs
7 Mini System Port (MSP) Screw-Terminal
Connector
8AudioIn/OutCables(OneIncludedinKit)
9Button0
3
4
5
7
1
9
2
6
8
NI myRIO

2|ni.com |NI myRIO-1900 User Guide and Specifications
Safety Information
Caution Do not operate the hardware in a manner not specified in this document
and in the user documentation. Misuse of the hardware can result in a hazard. You
can compromise the safety protection if the hardware is damaged in any way. If the
hardware is damaged, return it to National Instruments for repair.
Clean the hardware with a soft, nonmetallic brush. Make sure that the hardware is completely
dry and free from contaminants before returning it to service.
Electromagnetic Compatibility Guidelines
This product was tested and complies with the regulatory requirements and limits for
electromagnetic compatibility (EMC) stated in the product specifications. These requirements
and limits provide reasonable protection against harmful interference when the product is
operated in the intended operational electromagnetic environment.
This product is intended for use in commercial locations. There is no guarantee that harmful
interference will not occur in a particular installation or when the product is connected to a test
object. To minimize interference with radio and television reception and prevent unacceptable
performance degradation, install and use this product in strict accordance with the instructions
in the product documentation.
Furthermore, any modifications to the product not expressly approved by National Instruments
could void your authority to operate it under your local regulatory rules.
Caution This product was tested for EMC compliance using myRIO application
software. The maximum length for USB cables is 2.0 m (6.6 ft), and the maximum
length for signal wires is 30.0 cm (11.8 in.).
Caution The mounting keyholes on the back of the NI myRIO-1900 are sensitive
to electrostatic discharge (ESD). When handling the device, be careful not to touch
inside the keyholes.

NI myRIO-1900 User Guide and Specifications |© National Instruments |3
Hardware Overview
The NI myRIO-1900 provides analog input (AI), analog output (AO), digital input and output
(DIO), audio, and power output in a compact embedded device. The NI myRIO-1900 connects
to a host computer over USB and wireless 802.11b,g,n.
The following figure shows the arrangement and functions of NI myRIO-1900 components.
Figure 2. NI myRIO-1900 Hardware Block Diagram
Processor (LabVIEW RT)
FPGA (LabVIEW FPGA)
MXP A/B
MSP C
(x2)
+3.3V
UART
4AI
2AO
16 16
DIO
DDR3
Nonvolatile
Memory
Wireless
Wireless
Button
Watchdog
Status
LED
Wireless
LED
+5 V
2
AI
2
AO
88
DIO
–15 V
+15 V
2
Audio Out
2
Audio In
Reset
Button
USB Device
Port
USB Host
Port
Accelerometer Button0
Xilinx Zynq-7010
User
LEDs

4|ni.com |NI myRIO-1900 User Guide and Specifications
Connector Pinouts
NI myRIO-1900 Expansion Port (MXP) connectors A and B carry identical sets of signals. The
signals are distinguished in software by the connector name, as in ConnectorA/DIO1 and
ConnectorB/DIO1. Refer to the software documentation for information about configuring
and using signals. The following figure and table show the signals on MXP connectors A and B.
Note that some pins carry secondary functions as well as primary functions.
Figure 3. Primary/Secondary Signals on MXP Connectors A and B
33 33
34
1
234 2
1
AB
AO0 AO1
AGND
DGND
UART.RX
DGND
UART.TX
DGND
DIO11 / ENC.A
DGND
DIO12 / ENC.B
DGND
DIO13
DGND DGND
DIO14 / I2C.SCL
DIO15 / I2C.SDA
+5V AI1 AI3 AI2 DIO1 DIO2 DIO3 DIO4 AI0 DIO0 DIO5 / SPI.CLK DIO6 / SPI.MISO
DIO7 / SPI.MOSI
DIO8/ PWM0 DIO9 / PWM1 DIO10 / PWM2 +3.3V
34
33
32
31
30
29
28
27
26
25
24
23
22
21
20
19
18
17
16
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1

NI myRIO-1900 User Guide and Specifications |© National Instruments |5
Table 1. Descriptions of Signals on MXP Connectors A and B
Signal Name Reference Direction Description
+5V DGND Output +5 V power output.
AI <0..3> AGND Input 0-5 V, referenced, single-ended analog
input channels. Refer to the Analog
Input Channels section for more
information.
AO <0..1> AGND Output 0-5 V referenced, single-ended analog
output. Refer to the Analog Output
Channels section for more information.
AGND N/A N/A Reference for analog input and output.
+3.3V DGND Output +3.3 V power output.
DIO <0..15> DGND Input or
Output
General-purpose digital lines with
3.3 V output, 3.3 V/5 V-compatible
input. Refer to the DIO Lines section for
more information.
UART.RX DGND Input UART receive input. UART lines are
electrically identical to DIO lines.
UART.TX DGND Output UART transmit output. UART lines are
electrically identical to DIO lines.
DGND N/A N/A Reference for digital signals, +5 V, and
+3.3 V.

6|ni.com |NI myRIO-1900 User Guide and Specifications
The following figure and table show the signals on Mini System Port (MSP) connector C. Note
that some pins carry secondary functions as well as primary functions.
Figure 4. Primary/Secondary Signals on MSP Connector C
Table 2. Descriptions of Signals on MSP Connector C
Signal Name Reference Direction Description
+15V/-15V AGND Output +15 V/-15 V power output.
AI0+/AI0-;
AI1+/AI1-
AGND Input ±10 V, differential analog input
channels. Refer to the Analog Input
Channels section for more information.
AO <0..1> AGND Output ±10 V referenced, single-ended analog
output channels. Refer to the Analog
Output Channels section for more
information.
AGND N/A N/A Reference for analog input and output
and +15 V/-15 V power output.
+5V DGND Output +5 V power output.
DIO <0..7> DGND Input or
Output
General-purpose digital lines with
3.3 V output, 3.3 V/5 V-compatible
input. Refer to the DIO Lines section for
more information.
DGND N/A N/A Reference for digital lines and +5 V
power output.
DGND DIO7 / PWM1 DIO6 / ENC1.B DIO5 DIO4 / ENC1.A DIO2 / ENC0.B DIO3/ PWM0 DIO0 / ENC0.A AI1+ AI0– AGND AO0 AGND +15 V 5 V DIO1 AI1– AI0+ AO1
–15 V
1817 20
19
1615141312
10 11
9
8
7
6 54
32
1
AUDIO
IN
AUDIO
OUT

NI myRIO-1900 User Guide and Specifications |© National Instruments |7
Analog Input Channels
The NI myRIO-1900 has analog input channels on myRIO Expansion Port (MXP) connectors A
and B, Mini System Port (MSP) connector C, and a stereo audio input connector. The analog
inputs are multiplexed to a single analog-to-digital converter (ADC) that samples all channels.
MXP connectors A and B have four single-ended analog input channels per connector, AI0-AI3,
which you can use to measure 0-5 V signals. MSP connector C has two high-impedance,
differential analog input channels, AI0 and AI1, which you can use to measure signals up to
±10 V. The audio inputs are left and right stereo line-level inputs with a ±2.5 V full-scale range.
Note For important information about improving measurement accuracy by
reducing noise, go to ni.com/info and enter the Info Code analogwiring.
Table 3. Descriptions of Signals on Audio Connectors
Signal Name Reference Direction Description
AUDIO IN N/A Input Left and right audio inputs on stereo
connector.
AUDIO OUT N/A Output Left and right audio outputs on stereo
connector.

8|ni.com |NI myRIO-1900 User Guide and Specifications
Figure 5 shows the analog input topology of the NI myRIO-1900.
Figure 5. NI myRIO-1900 Analog Input Circuitry
Analog Output Channels
The NI myRIO-1900 has analog output channels on myRIO Expansion Port (MXP) connectors
A and B, Mini System Port (MSP) connector C, and a stereo audio output connector. Each
analog output channel has a dedicated digital-to-analog converter (DAC), so they can all update
simultaneously. The DACs for the analog output channels are controlled by two serial
communication buses from the FPGA. MXP connectors A and B share one bus, and MSP
connector C and the audio outputs share a second bus. Therefore, the maximum update rate is
specified as an aggregate figure in the Analog Output section of the Specifications.
MXP connectors A and B have two analog output channels per connector, AO0 and AO1, which
you can use to generate 0-5 V signals. MSP connector C has two analog output channels, AO0
and AO1, which you can use to generate signals up to ±10 V. The audio outputs are left and right
stereo line-level outputs capable of driving headphones.
Caution Before using headphones to listen to the audio output of the
NI myRIO-1900, ensure that the audio output is at a safe level. Listening to
audio signals at a high volume may result in permanent hearing loss.
MUX ADC
AI0
AI1
AI2
AI3
AI0
AI1
AI2
AI3
0–5 V
MXP A
MXP B
AI0 +
–
MSP C
±10 V
AI1 +
–
Audio Input
±2.5 V
Left
Right

NI myRIO-1900 User Guide and Specifications |© National Instruments |9
Figure 6 shows the analog output topology of the NI myRIO-1900.
Figure 6. NI myRIO-1900 Analog Output Circuitry
Accelerometer
The NI myRIO-1900 contains a three-axis accelerometer. The accelerometer samples each axis
continuously and updates a readable register with the result. Refer to the Accelerometer section
of the Specifications for the accelerometer sample rates.
DAC
DAC
DAC
DAC
0–5 V
MXP A
MXP B
AO0
AO1
AO0
AO1
DAC
DAC
MSP C
±10 V
AO0
AO1
DAC
DAC
Audio Output
±2.5 V
Left
Right

10 |ni.com |NI myRIO-1900 User Guide and Specifications
Converting Raw Data Values to Voltage
You can use the following equations to convert raw data values to volts:
V = Raw Data Value * LSB Weight
LSB Weight = Nominal Range ÷ 2ADC Resolution
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,
LSB Weight = 5 V ÷ 212 = 1.221 mV
Maximum reading = 4095 * 1.221 mV = 4.999 V
•For AI and AO channels on the MSP connectors,
LSB Weight = 20 V ÷ 212 = 4.883 mV
Maximum Positive Reading = +2047 * 4.883 mV = 9.995 V
Maximum Negative Reading = -2048 * 4.883 mV = -10.000 V
•For Audio In/Out,
LSB Weight = 5 V ÷ 212 = 1.221 mV
Maximum Positive Reading = +2047 * 1.221 mV = 2.499 V
Maximum Negative Reading = -2048 * 1.221 mV = -2.500 V
• For the accelerometer,
LSB Weight = 16 g ÷ 212 = 3.906 mg
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