Measurement Computing USB-3102 User manual

USB-3102
USB-based Analog Output
User's Guide
November 2017. Rev. 5
© Measurement Computing Corporation

2
USB-3102
Trademark and Copyright Information
Measurement Computing Corporation, InstaCal, Universal Library, and the Measurement Computing logo are
either trademarks or registered trademarks of Measurement Computing Corporation. Refer to the Copyrights &
Trademarks section on mccdaq.com/legal for more information about Measurement Computing trademarks.
Other product and company names mentioned herein are trademarks or trade names of their respective
companies.
© 2017 Measurement Computing Corporation. All rights reserved. No part of this publication may be
reproduced, stored in a retrieval system, or transmitted, in any form by any means, electronic, mechanical, by
photocopying, recording, or otherwise without the prior written permission of Measurement Computing
Corporation.
Notice
Measurement Computing Corporation does not authorize any Measurement Computing Corporation product for
use in life support systems and/or devices without prior written consent from Measurement Computing
Corporation. Life support devices/systems are devices or systems that, a) are intended for surgical implantation
into the body, or b) support or sustain life and whose failure to perform can be reasonably expected to result in
injury. Measurement Computing Corporation products are not designed with the components required, and are
not subject to the testing required to ensure a level of reliability suitable for the treatment and diagnosis of
people.

3
Table of Contents
Preface
About this User's Guide .......................................................................................................................5
What you will learn from this user's guide .........................................................................................................5
Conventions in this user's guide .........................................................................................................................5
Where to find more information .........................................................................................................................5
Chapter 1
Introducing the USB-3102 ....................................................................................................................6
Overview: USB-3102 features............................................................................................................................6
USB-3102 block diagram ...................................................................................................................................7
Chapter 2
Installing the USB-3102 ........................................................................................................................8
Unpacking...........................................................................................................................................................8
Installing the software ........................................................................................................................................8
Installing the hardware .......................................................................................................................................8
Calibrating the hardware.....................................................................................................................................8
Chapter 3
Functional Details .................................................................................................................................9
External components ..........................................................................................................................................9
USB connector.................................................................................................................................................................. 9
Status LED........................................................................................................................................................................ 9
Power LED ....................................................................................................................................................................... 9
Screw terminal banks.......................................................................................................................................................10
Analog voltage output terminals (VOUT0 to VOUT3)....................................................................................................11
Analog current output terminals (IOUT0 to IOUT3) .......................................................................................................11
Current Test terminal (ITEST).........................................................................................................................................12
Digital I/O terminals (DIO0 to DIO7)..............................................................................................................................13
Digital I/O control terminal (DIO CTL) for pull-up/down configuration ........................................................................13
Ground terminals (AGND, DGND) .................................................................................................................................13
Synchronous DAC load terminal (SYNCLD)..................................................................................................................13
Counter terminal (CTR)...................................................................................................................................................14
Power terminal (+5V) ......................................................................................................................................................14
Synchronizing multiple units............................................................................................................................14
Chapter 4
Specifications......................................................................................................................................15
Analog voltage output ......................................................................................................................................15
Analog current output.......................................................................................................................................16
Analog output calibration .................................................................................................................................17
Digital input/output...........................................................................................................................................17
Synchronous DAC Load...................................................................................................................................17
Counter .............................................................................................................................................................18
Memory ............................................................................................................................................................18
Microcontroller.................................................................................................................................................18
Power ................................................................................................................................................................19
USB specifications ...........................................................................................................................................19
Environmental ..................................................................................................................................................19
Mechanical .......................................................................................................................................................19

USB-3102 User's Guide About this User's Guide
4
Screw terminal connector .................................................................................................................................20
EU Declaration of Conformity............................................................................................................21

5
Preface
About this User's Guide
What you will learn from this user's guide
This user's guide describes the Measurement Computing USB-3102 data acquisition device and lists device
specifications.
Conventions in this user's guide
For more information
Text presented in a box signifies additional information and helpful hints related to the subject matter you are
reading.
Caution! Shaded caution statements present information to help you avoid injuring yourself and others,
damaging your hardware, or losing your data.
Bold text is used for the names of objects on a screen, such as buttons, text boxes, and checkboxes.
Italic text is used for the names of manuals and help topic titles, and to emphasize a word or phrase.
Where to find more information
Additional information about USB-3102 hardware is available on our website at www.mccdaq.com. You can
also contact Measurement Computing Corporation with specific questions.
Knowledgebase: kb.mccdaq.com
Tech support form: www.mccdaq.com/support/support_form.aspx
Email: [e-mail]
Phone: [phone] and follow the instructions for reaching Tech Support
For international customers, contact your local distributor. Refer to the International Distributors section on our
web site at www.mccdaq.com/International.

6
Chapter 1
Introducing the USB-3102
Overview: USB-3102 features
This user's guide contains all of the information you need to connect the USB-3102 to your computer and to the
signals you want to control. The USB-3102 is part of the Measurement Computing brand of USB-based data
acquisition products.
The USB-3102 is a USB 2.0 full-speed device that is supported under popular Microsoft®Windows®operating
systems. The USB-3102 is fully compatible with both USB 1.1 and USB 2.0 ports.
The USB-3102 provides four channels of analog voltage output, four channels of analog current output, eight
digital I/O connections, and one 32-bit event counter.
The USB-3102 has a quad (4-channel) 16-bit digital-to-analog converter (DAC). Each D/A converter output
controls a voltage and current channel pair simultaneously.
You set the voltage output range of each DAC channel independently with software for either bipolar, unipolar
or current. The bipolar range is ±10 V, the unipolar range is 0 to 10 V, and the analog current range is 0 to
20 mA. Each voltage/current channel pair can be updated individually or simultaneously. A bidirectional
synchronization connection allows you to simultaneously update the DAC outputs on multiple devices.
The USB-3102 features eight bidirectional digital I/O connections. You can configure the DIO lines as input or
output in one 8-bit port. All digital pins are floating by default. A screw terminal connection is provided for
pull-up (+5 V) or pull-down (0 volts) configuration.
The 32-bit counter can count TTL pulses.
The USB-3102 is powered by the +5 volt USB supply from your computer. No external power is required. All
I/O connections are made to the screw terminals located along each side of the USB-3102.
Figure 1. USB-3102

USB-3102 User's Guide Introducing the USB-3102
7
USB-3102 block diagram
USB-3102 functions are illustrated in the block diagram shown here.
Figure 2. USB-3102 block diagram
USB
Screw terminal I/O connector
SPI
USB
Microcontroller
Screw terminal I/O connector
8
SYNCLD
4
4
Event Counter
1 channel
(32-bit) 1
D/A
Analog Voltage
Output
4 channels (16-bit)
DIO
8channels
Analog Current
Output
4 channels (16-bit)
4-channel
Quad
4
Full-speed
USB 2.0
Compliant
Interface

8
Chapter 2
Installing the USB-3102
Unpacking
As with any electronic device, you should take care while handling to avoid damage from static
electricity. Before removing the device from its packaging, ground yourself using a wrist strap or by simply
touching the computer chassis or other grounded object to eliminate any stored static charge.
Contact us immediately if any components are missing or damaged.
Installing the software
Refer to the MCC DAQ Quick Start and the USB-3102 product page on our website for information about the
software supported by the USB-3102.
Install the software before you install your device
The driver needed to run the USB-3102 is installed with the software. Therefore, you need to install the
software package you plan to use before you install the hardware.
Installing the hardware
To connect the USB-3102 to your system, connect the USB cable to an available USB port on the computer or
to an external USB hub connected to the computer. Connect the other end of the USB cable to the USB
connector on the device. No external power is required.
When connected for the first time, a Found New Hardware dialog opens when the operating system detects the
device. When the dialog closes, the installation is complete. The Status LED on the USB-3102 turns on after
the device is successfully installed.
If the Power LED turns off
If communication is lost between the device and the computer, the device LED turns off. To restore
communication, disconnect the USB cable from the computer and then reconnect it. This should restore
communication, and the LED should turn on.
Calibrating the hardware
The Measurement Computing Manufacturing Test department performs the initial factory calibration. Return
the device to Measurement Computing Corporation when calibration is required. The recommended calibration
interval is one year.

9
Chapter 3
Functional Details
External components
The USB-3102 has the following external components, as shown in Figure 3.
USB connector
Status LED
Power LED
Screw terminal banks (2)
Figure 3. USB-3102 external components
USB connector
The USB connector provides power and communication to the USB-3102. The voltage supplied through the
USB connector is system-dependent, and may be less than 5 V. No external power supply is required.
Status LED
The Status LED indicates the communication status of the USB-3102. It flashes when data is being transferred,
and is off when the USB-3102 is not communicating. This LED uses up to 10 mA of current and cannot be
disabled.
Power LED
The power LED lights up when the USB-3102 is connected to a USB port on your computer or to an external
USB hub that is connected to your computer.

USB-3102 User's Guide Functional Details
10
Screw terminal banks
The USB-3102 has two rows of screw terminals—one row on the top edge of the housing, and one row on the
bottom edge. Each row has 28 connections. Use 16 AWG to 30 AWG wire gauge when making screw terminal
connections. Pin numbers are identified in Figure 4.
Figure 4. USB-3102 screw terminal pin numbering
Screw terminal – pins 1-28
The screw terminals on the bottom edge of the USB-3102 (pins 1 to 28) provide the following connections:
Two analog voltage output connections (VOUT0, VOUT2)
Two analog current output connections (IOUT0, IOUT2)
Four analog ground connections (AGND)
Eight digital I/O connections (DIO0 to DIO7)
Screw terminal – pins 29-56
The screw terminals on the top edge of the USB-3102 (pins 29 to 56) provide the following connections:
Two analog voltage output connections (VOUT1, VOUT3)
Two analog current output connections (IOUT1, IOUT3)
Four analog ground connections (AGND)
One SYNC terminal for external clocking and multi-unit synchronization (SYNCLD)
Three digital ground connections (DGND)
One current test connection (ITEST)
One external event counter connection (CTR)
One digital I/O pull-up/down resistor connection (DIO CTL)
One voltage output power connection (+5 V)
Pin 56
Pin 29
Pin 28
Pin 1

USB-3102 User's Guide Functional Details
11
Figure 5. USB-3102 signal pinout
Analog voltage output terminals (VOUT0 to VOUT3)
The screw terminal pins labeled VOUT0 to VOUT3are voltage output terminals (see Figure 5). The voltage
output range for each channel is software-programmable for either bipolar or unipolar. The bipolar range is
±10 V, and the unipolar range is 0 to 10 V.
Each D/A converter output controls a voltage and current channel pair simultaneously. When you write to a
voltage output, its associated current output is also updated. Each channel pair can be updated individually or
simultaneously.
Leave each pair of unused voltage and current outputs disconnected.
Analog current output terminals (IOUT0 to IOUT3)
The screw terminal pins labeled IOUT0 to IOUT3are current output terminals (see Figure 5). The current range
for each channel is 0 to 20 mA.
Each D/A converter output controls a voltage and current channel pair simultaneously. When you write to a
current output, its associated voltage output is also updated. Each channel pair can be updated individually or
simultaneously. Leave each pair of unused voltage and current outputs disconnected.
Figure 6 shows a typical analog current output circuit. A minimum of 8 VDC must be available at IOUTn. A
maximum of 36 VDC external excitation voltage is used to power the loop. Consider the drop across the load
when selecting the supply voltage.
A typical application uses a 24 V loop supply. The loop can use either a grounded load where the supply floats,
or a grounded supply where the load floats. Each connection method is shown in Figure 6.
29 VOUT1
30 IOUT1
31 VOUT3
32 IOUT3
33 AGND
34
35
36
37
38 AGND
39 NC
40
41
42
43 AGND
44
45
46
47
50 DGND
51 ITEST
52 CTR
53 DGND
54 DIO CTL
55 DGND
56 +5V
48AGND
49 SYNCLD
NC
NC
NC
NC
NC
NC
NC
NC
NC
NC
NC
VOUT01
IOUT0 2
VOUT2 3
IOUT2 4
AGND 5
AGND 10
AGND 15
AGND 20
DIO021
DIO1 22
DIO2 23
DIO3 24
DIO4 25
DIO5 26
DIO6 27
DIO7 28
6
7
8
9
11
12
13
14
16
17
18
19
NC
NC
NC
NC
NC
NC
NC
NC
NC
NC
NC
NC

USB-3102 User's Guide Functional Details
12
Figure 6. Typical analog current output circuit
Refer to the manufacturer's information for the device being controlled for additional details.
Current Test terminal (ITEST)
The ITEST connection (pin 51) is used with InstaCal to test the functionality of the analog current output
(IOUT) pins. The ITEST connection circuit is shown in Figure 7.
Figure 7. Current output test circuit
Do not test more that one current output pin at a time. The ITEST output is not adequate for application use. It is
intended for test purposes only.
Connection with
grounded load
Connection with
grounded supply
Grounded
External
Supply
+
IOUTn
AGND
Floating Load
IOUTn
IOUTn+1
IOUTn+2
Floating Load
IOUTn+1
Floating Load
IOUTn+2
IOUTn
AGND
Grounded
Load
IOUTn+1
IOUTn+2
+Floating Supply
IOUTn+1
Floating Ext.
Supply
+Floating Supply
IOUTn+1
Floating Ext.
Supply
+Floating Supply
IOUTn+1
Floating Ext.
Supply
IOUTn+2
IOUTn
IOUTn+1
IOUTn+1
IOUTn+2
IOUTn
ITEST
IOUTn
Limit one channel

USB-3102 User's Guide Functional Details
13
Digital I/O terminals (DIO0 to DIO7)
You can connect up to eight digital I/O lines to the screw terminals labeled DIO0 to DIO7 (pins 21 through 28).
You can configure each digital bit for either input or output.
When you configure the digital bits for input, you can use the digital I/O terminals to detect the state of any
TTL level input; refer to Figure 8. When the switch is set to the +5 V USER input, DIO7 reads TRUE (1). If you
move the switch to DGND, DIO7 reads FALSE (0).
Figure 8. Schematic showing DIO7 detecting the state of a switch
For more information on digital signal connections
For more information on digital signal connections and digital I/O techniques, refer to the Guide to Signal
Connections (available on our website at www.mccdaq.com/support/DAQ-Signal-Connections.aspx).
Digital I/O control terminal (DIO CTL) for pull-up/down configuration
All digital pins are floating by default. When inputs are floating, the state of unwired inputs are undefined (they
may read high or low). You can configure the inputs to read a high or low value when they aren’t wired. Use the
DIO CTL connection (pin 54) to configure the digital pins for pull-up (inputs read high when unwired) or pull-
down (inputs read low when unwired).
To pull up the digital pins to +5V, wire the DIO CTL terminal pin to the +5V terminal pin (pin 56).
To pull down the digital pins to ground (0 volts), wire the DIO CTL terminal pin to a DGND terminal pin
(pin 50, 53, or 55).
Ground terminals (AGND, DGND)
Eight analog ground (AGND) connections provide a common ground for all analog voltage and current output
channels. Three digital ground (DGND) connections provide a common ground for the DIO, CTR, SYNCLD and
+5V connections.
Synchronous DAC load terminal (SYNCLD)
The synchronous DAC load connection (pin 49) is a bidirectional I/O signal that allows you to simultaneously
update the DAC outputs on multiple devices. You can use this pin for two purposes:
Configure as an input (slave mode) to receive the D/A LOAD signal from an external source.
When the SYNCLD pin receives the trigger signal, the analog outputs are updated simultaneously.
SYNCLD pin must be logic low in slave mode for immediate update of DAC outputs
When the SYNCLD pin is in slave mode, the analog outputs can be updated immediately or when a positive
edge is seen on the SYNCLD pin (this is under software control.)
The SYNCLD pin must be at a low logic level for DAC outputs to update immediately. If the external source
supplying the D/A LOAD signal is pulling the SYNCLD pin high, no update will occur.
Refer to the "USB-3100 Series" topic in the Universal Library Help for information on how to update DAC
outputs immediately.
+5V
DGND
DIO7

USB-3102 User's Guide Functional Details
14
Configure as an output (master mode) to send the internal D/A LOAD signal to the SYNCLD pin.
You can use the SYNCLD pin to synchronize with a second USB-3102 and simultaneously update the
DAC outputs on each device. Refer to Synchronizing multiple units below.
Use InstaCal to configure the SYNCLD mode as master or slave. On power up and reset the SYNCLD pin is set
to slave mode (input).
Counter terminal (CTR)
The CTR connection (pin 52) is the input to the 32-bit event counter. The internal counter increments when the
TTL levels transition from low to high. The counter can count frequencies of up to 1 MHz.
Power terminal (+5V)
The +5 V connection (pin 56) draws power from the USB connector. This terminal is a +5V output.
Caution! The +5V terminal is an output. Do not connect to an external power supply or you may damage
the USB-3102 and possibly the computer.
Synchronizing multiple units
You can connect the SYNCLD terminal pin (pin 49) of two USB-3102 units together in a master/slave
configuration and simultaneously update the DAC outputs of both devices. Do the following.
1. Connect the SYNCLD pin of the master USB-3102 to the SYNCLD pin of the slave USB-3102.
2. Configure the SYNCLD pin on the slave device for input to receive the D/A LOAD signal from the master
device. Use InstaCal to set the direction of the SYNCLD pin.
3. Configure the SYNCLD pin on the master device for output to generate an output pulse on the SYNCLD
pin.
Set the Universal Library SIMULTANEOUS option for each device. Refer to the Universal Library Help for
information on how to configure the USB-3102 with the Universal Library.
When the SYNCLD pin on the slave device receives the signal, the analog output channels on each device are
updated simultaneously.
An example of a master/slave configuration is shown here.
Figure 9. Synchronizing the update of multiple devices
S
Slave
PMD-1608F
Master
device
Slave
device
SYNCLD pin
(terminal pin 49)
D/A LOAD signal
Configure the SYNCLD
pin for output
Configure the SYNCLD
pin for input

15
Chapter 4
Specifications
All specifications are subject to change without notice.
Typical for 25 °C unless otherwise specified.
Specifications in italic text are guaranteed by design.
Analog voltage output
Table 1. Analog voltage output specifications
Parameter Condition Specification
Digital to Analog converter
DAC8554
Number of channels
(Note 1)
4
Resolution
16 bits
Output ranges
Calibrated
±10 V, 0 to 10 V
Software configurable
Un-calibrated
±10.2 V, -0.04 to 10.08 V
Software configurable
Output transient
±10 V to (0 to 10 V) or
(0 to 10 V) to ±10 V range
selection. (Note 2)
Duration: 5 uS typ
Amplitude: 5V p-p typ
Host PC is reset, powered on,
suspended or a reset command is
issued to device. (Note 3)
Duration: 2 S typ
Amplitude: 2V p-p typ
Initial power on
Duration: 50 mS typ
Amplitude: 5V peak typ
Differential non-linearity
(Note 4)
Calibrated ±1.25 LSB typ
-2 LSB to +1 LSB max
Un-calibrated
±0.25 LSB typ
±1 LSB max
Output current
VOUTx pins
±3.5 mA typ
Output short-circuit protection
VOUTx connected to AGND
Indefinite
Output coupling
DC
Power on and reset state
DACs cleared to zero-scale: 0 V, ±50 mV typ
Output range: 0-10 V
Output noise
0 to 10 V range
14.95 µVrms typ
±10 V range
31.67 µVrms typ
Settling time
to 1 LSB accuracy
25 µS typ
Slew rate
0 to 10 V range
1.20 V/µS typ
±10 V range
1.20 V/µS typ
Throughput
Single-channel
100 Hz max, system dependent
Multi-channel
100 Hz/#ch max, system dependent
Note 1: Each of the four DAC8554 outputs controls a VOUTx and IOUTx channel-pair simultaneously. So, for
example, when writing to channel VOUT0, the associated IOUT0 channel will also be updated. Conversely,
when writing to channel IOUT0, the associated VOUT0 channel is also updated. Unused VOUTx and IOUTx
output channels should be left disconnected.
Note 2: The USB-3102 output voltage level defaults to 0V whenever the output voltage range is reconfigured.
The USB-3102 output voltage level will also default to 0V:
1) Whenever the host PC is reset, shut down or suspended.
2) If a reset command is issued to the device.

USB-3102 User's Guide Specifications
16
Note 3: The duration of this output transient is highly dependent on the enumeration process of the host PC. Typically
the output of the USB-3102 is stable after 2 seconds.
Note 4: The maximum differential non-linearity specification applies to the entire 0 to 50 °C temperature range of the
USB-3102. This specification also accounts for the maximum errors due to the software calibration algorithm
(in Calibrated mode only) and the DAC8554 digital to analog converter non-linearities.
Table 2. Absolute accuracy specifications – calibrated output
Range Accuracy (±LSB)
±10 V
14.0
0 to 10 V
22.0
Table 3. Absolute accuracy components specifications – calibrated output
Range % of reading Offset (±mV) Temp drift (%/°C) Absolute accuracy at FS (±mV)
±10 V ±0.0183 1.831 0.00055 3.661
0 to 10 V
±0.0183
0.915
0.00055
2.746
Table 4. Relative accuracy specifications
Range Relative accuracy (±LSB)
±10 V , 0 to 10 V
4.0 typ
12.0 max
Analog current output
Table 5. Analog current output specifications
Parameter Condition Specification
Number of channels (Note 5) 4
Resolution
16 bits
Output ranges
Calibrated
0 to 20 mA typ
Uncalibrated
0 to 25 mA typ
Compliance voltage range
(Note 6)
Calibrated output
+8 V min
+36 V max
Differential non-linearity (Note 7)
Calibrated
±1.25 LSB typ
-2 LSB to +1 LSB max
Un-calibrated
±0.25 LSB typ
-1 LSB to +1 LSB max
Absolute accuracy Compliance voltage = +13V
Resistive load = 100Ω
±0.05% of full scale range
IOUTx leakage current
All zeros written to IOUTx
channel
100nA typ (each individual IOUT
channel)
Settling time
Full scale step to 1LSB accuracy
Compliance voltage = 12V, Rload
= 500Ω
25 µS typ
Throughput Single-channel 100 Hz max, system dependent
Multi-channel
100 Hz/#ch max, system dependent
Note 5: Each of the four DAC8554 outputs controls a VOUTx and IOUTx channel-pair simultaneously. So, for
example, when writing to channel VOUT0, the associated IOUT0 channel will also be updated. Conversely,
when writing to channel IOUT0, the associated VOUT0 channel is also updated. Unused VOUTx and IOUTx
output channels should be left disconnected.
Note 6: The following formula will calculate the maximum load resistance for correct IOUT circuit operation. The
compliance voltage applied should not exceed the limits specified in Table 5.
Calibrated Output: Load Resistance = (Compliance Voltage - 6V)/0.020A
Un-Calibrated Output: Load Resistance = (Compliance Voltage - 6V)/0.025A

USB-3102 User's Guide Specifications
17
Note 7: The maximum differential non-linearity specification applies to the entire 0 to 70 °C temperature range of the
USB-3102. This specification also accounts for the maximum errors due to the software calibration algorithm
(in Calibrated mode only) and the DAC8554 digital to analog converter non-linearities.
Analog output calibration
Table 6. Analog output calibration specifications
Parameter Specifications
Recommended warm-up time
15 minutes min
On-board precision reference
DC level: 5.000 V ±1 mV max
Tempco: ±10 ppm/°C max
Long term stability: ±10 ppm/SQRT(1000 hrs)
Calibration method
Software calibration
Calibration interval
1 year
Digital input/output
Table 7. Digital I/O specifications
Parameter Specification
Digital logic type
CMOS
Number of I/O
8
Configuration
Independently configured for input or output
Pull-up/pull-down configuration
(Note 8)
User configurable
All pins floating (default)
Digital I/O input loading
TTL (default)
47 k
Ω
(pull-up/pull-down configurations)
Digital I/O transfer rate (system paced)
System dependent, 33 to 1000 port reads/writes or single bit reads/writes per
second.
Input high voltage 2.0 V min, 5.5 V absolute max
Input low voltage
0.8 V max, –0.5 V absolute min
Output high voltage (IOH = –2.5 mA)
3.8 V min
Output low voltage (IOL = 2.5 mA)
0.7 V max
Power on and reset state
Input
Note 8: Pull up and pull down configuration area available using the DIO CTL terminal block pin 54. The pull-down
configuration requires the DIO CTL pin (pin 54) to be connected to a DGND pin (pin 50, 53 or 55). For a
pull-up configuration, the DIO CTL pin should be connected to the +5V terminal pin (pin 56).
Synchronous DAC Load
Table 8. SYNCLD I/O specifications
Parameter Condition Specification
Pin name
SYNCLD (terminal block pin 49)
Power on and reset state Input
Pin type
Bidirectional
Termination
Internal 100K ohms pull-down
Software selectable direction
Output
Outputs internal D/A LOAD signal.
Input
Receives D/A LOAD signal from external source.
Input clock rate
100 Hz max
Clock pulse width
Input
1 µs min
Output
5 µs min

USB-3102 User's Guide Specifications
18
Input leakage current
±1.0 µA typ
Input high voltage
4.0 V min, 5.5 V absolute max
Input low voltage
1.0 V max, –0.5 V absolute min
Output high voltage (Note 9) IOH = –2.5 mA 3.3 V min
No load
3.8 V min
Output low voltage (Note 10)
IOL = 2.5 mA
1.1 V max
No load
0.6 V max
Note 9: SYNCLD is a Schmitt trigger input and is over-current protected with a 200 Ohm series resistor.
Note 10: When SYNCLD is in input mode, the analog outputs may either be updated immediately or when a positive
edge is seen on the SYNCLD pin (this is under software control.) However, the pin must be at a low logic level
for the DAC outputs to be updated immediately. If an external source is pulling the pin high, no update will
occur.
Counter
Table 9. CTR I/O specifications
Parameter Condition Specification
Pin name
CTR
Number of channels 1
Resolution
32-bits
Counter type
Event counter
Input type
TTL, rising edge triggered
Counter read/writes rates
(software paced)
Counter read
System dependent, 33 to 1000 reads per second.
Counter write
System dependent, 33 to 1000 reads per second.
Schmidt trigger hysteresis 20 mV to 100 mV
Input leakage current
±1.0 µA typ
Input frequency
1 MHz max
High pulse width
500 nS min
Low pulse width
500 ns min
Input high voltage
4.0 V min, 5.5 V absolute max
Input low voltage
1.0 V max, –0.5 V absolute min
Memory
Table 10. Memory specifications
Parameter Specification
EEPROM
256 bytes
EEPROM configuration
Address range Access Description
0x000-0x0FF
Read/write
256 bytes user data
Microcontroller
Table 11. Microcontroller specifications
Parameter Specification
Type
High performance 8-bit RISC microcontroller
Program memory
16,384 words
Data memory
2,048 bytes

USB-3102 User's Guide Specifications
19
Power
Table 12. Power specifications
Parameter Conditions Specification
Supply current
USB enumeration
< 100 mA
Supply current (Note 11)
Quiescent current
140 mA typ
+5V user output voltage range (Note 12)
Available at terminal block pin 56
4.5 V min, 5.25 V max
+5V user output current (Note 13)
Available at terminal block pin 56
10 mA max
ITEST output voltage range
Available at terminal block pin 51
13V, ±1% typ
ITEST output current (Note 14)
Available at terminal block pin 51
30mA max
Note 11: This is the total quiescent current requirement for the USB-3102 which includes up to 10 mA for the status
LED. This does not include any potential loading of the digital I/O bits, +5V user terminal, ITEST, or the
VOUTx/IOUTx outputs.
Note 12: Output voltage range assumes USB power supply is within specified limits.
Note 13: This refers to the total amount of current that can be sourced from the +5V user terminal (pin 56) for general
use. This specification also includes any additional contribution due to DIO loading.
Note 14: This refers to the total maximum amount of current that can be sourced from the ITEST user terminal (pin 51).
The ITEST terminal pin should only be used for biasing individual IOUTx outputs in order to facilitate
functional testing. A load resistor of 100Ω should be placed in series between the ITEST pin and the IOUTx pin
for proper operation.
USB specifications
Table 13. USB specifications
Parameter Specification
USB device type
USB 2.0 (full-speed)
USB device compatibility
USB 1.1, 2.0
USB cable length 3 m (9.84 ft) max
USB cable type
A-B cable, UL type AWM 2527 or equivalent (min 24 AWG VBUS/GND,
min 28 AWG D+/D–)
Environmental
Table 14. Environmental specifications
Parameter Specification
Operating temperature range
0 to 50 °C
Storage temperature range
–40 to 85 °C
Humidity
0 to 90% non-condensing
Mechanical
Table 15. Mechanical specifications
Parameter Specification
Dimensions (L × W × H)
127 × 89.9 × 35.6 mm (5.00 × 3.53 × 1.40 in.)

USB-3102 User's Guide Specifications
20
Screw terminal connector
Table 16. Main connector specifications
Parameter Specification
Connector type
Screw terminal
Wire gauge range
16 AWG to 30 AWG
Pin
Signal Name
Pin
Signal Name
1
VOUT0
29
VOUT1
2 IOUT0 30 IOUT1
3
VOUT2
31
VOUT3
4
IOUT2
32
IOUT3
5
AGND
33
AGND
6
NC
34
NC
7
NC
35
NC
8
NC
36
NC
9 NC 37 NC
10
AGND
38
AGND
11 NC 39 NC
12
NC
40
NC
13
NC
41
NC
14
NC
42
NC
15
AGND
43
AGND
16
NC
44
NC
17
NC
45
NC
18
NC
46
NC
19
NC
47
NC
20 AGND 48 AGND
21
DIO0
49
SYNCLD
22 DIO1 50 DGND
23
DIO2
51
ITEST
24
DIO3
52
CTR
25
DIO4
53
DGND
26
DIO5
54
DIO CTL
27
DIO6
55
DGND
28
DIO7
56
+5V