Measurement Computing USB-7202 User Manual

USB-7202

User's Guide

Multifunction DAQ with Simultaneous Analog Input

January 2019. Rev 12
© Measurement Computing Corporation

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for more information about Measurement Computing trademarks.

HM USB-7202.docx

Table of Contents

Preface

About this User's Guide ....................................................................................................................... 5

Conventions ........................................................................................................................................................ 5

Where to find more information ......................................................................................................................... 5

Chapter 1

Introducing the USB-7202 .................................................................................................................... 6

Functional block diagram ................................................................................................................................... 7

Chapter 2

Installing the USB-7202 ........................................................................................................................ 8

Unpacking........................................................................................................................................................... 8

Installing the software ........................................................................................................................................ 8

Installing the hardware ....................................................................................................................................... 8

Calibrating the hardware..................................................................................................................................... 9

Factory calibration ............................................................................................................................................................ 9

Field calibration ................................................................................................................................................................ 9

Chapter 3

Functional Details ............................................................................................................................... 10

Analog input acquisition modes ....................................................................................................................... 10

Software paced .................................................................................................................................................................10

Hardware paced ...............................................................................................................................................................10

BURSTIO ........................................................................................................................................................................10

Board components ............................................................................................................................................ 11

USB connector .................................................................................................................................................................11

OEM connector ................................................................................................................................................................11

Trigger/Sync connector ....................................................................................................................................................12

LED indicators ................................................................................................................................................................. 12

Screw terminals................................................................................................................................................................13

Signal connections ............................................................................................................................................ 13

Analog input ....................................................................................................................................................................13

Digital I/O ........................................................................................................................................................................13

SYNC I/O ........................................................................................................................................................................14

Trigger input ....................................................................................................................................................................14

Counter input ...................................................................................................................................................................14

Power output ....................................................................................................................................................................14

Ground .............................................................................................................................................................................15

Accuracy ........................................................................................................................................................... 15

Synchronized operations ................................................................................................................................... 17

Mechanical drawing ......................................................................................................................................... 18

Chapter 4

Specifications ...................................................................................................................................... 19

Analog input ..................................................................................................................................................... 19

Digital input/output........................................................................................................................................... 20

External trigger ................................................................................................................................................. 20

External clock input/output............................................................................................................................... 21

Counter ............................................................................................................................................................. 21

Memory ............................................................................................................................................................ 21

Microcontroller ................................................................................................................................................. 22

Indicator LEDs ................................................................................................................................................. 22

Power ................................................................................................................................................................ 22

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USB-7202 User's Guide

General ............................................................................................................................................................. 22

Environmental .................................................................................................................................................. 23

Mechanical ....................................................................................................................................................... 23

Screw terminal connector and pinout ............................................................................................................... 23

OEM connector and pinout (P4) ....................................................................................................................... 24

Trigger/Sync connector and pinout (P5) ........................................................................................................... 24

4

About this User's Guide

This document describes the Measurement Computing USB-7202 data acquisition device and lists device
specifications.

Conventions

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 Bold text is used for the names of objects on the screen, such as buttons, text boxes, and check boxes.

italic text 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

Preface

Additional information about USB-7202 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

.

5

Chapter 1

Introducing the USB-7202

The USB-7202 is a USB 2.0 full-speed device that provides the following features:

 Eight channels of 16-bit analog input

o 100 kS/s max total throughput (200 kS/s with BURSTIO enabled), 50 kS/s on any one channel
o Simultaneous sampling (1 A/D converter per input)
o Independently configurable input ranges

 Eight individually configurable digital I/O channels
 32-bit event counter
 Digital trigger input
 Bidirectional SYNC pin for external clocking and synchronization with another board
 USB/104 form factor
 Stackable 3.55" x 3.75" board dimensions

The USB-7202 device is compatible with both USB 1.1 and USB 2.0 ports. The speed of the device may be
limited when using a USB 1.1 port due to the difference in transfer rates on the USB 1.1 versions of the
protocol (low-speed and full-speed).

The USB-7202 is powered by the +5 volt USB supply from your computer; no external power is required. The
device is compatible with both USB 1.1 and USB 2.0 ports. A USB cable is shipped with the device.

Caution! There are no product safety, electromagnetic compatibility (EMC), or CE marking compliance

claims made for the USB-7202. The USB-7202 is intended for use as a component of a larger
system. MCC can help developers meet their compliance requirements. The end product supplier,
however, is responsible for conforming to any and all compliance requirements.

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USB-7202 User's Guide

Functional block diagram

USB-7202 functions are illustrated in the block diagram shown here.

Figure 1. Functional block diagram

7

Pin

Signal Name

Pin

Signal Name

1

N/C 2 VBUS

3

N/C 4 D–

5

N/C (do not connect anything to this pin)

6

D+

7

N/C (do not connect anything to this pin)

8

GND

9

N/C (do not connect anything to this pin)

10

SHIELD

Chapter 2

Installing the USB-7202

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-7202 product page on our website for information about the
software that supports the device.

Install the software before you install your device

The driver needed to run the USB-7202 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

There are two ways to connect the USB-7202 to your system:

 Connect a USB cable from the

USB connector to either a USB port on the computer or to an external USB

hub connected to the computer. No external power is required.

or

 Use a 2.54 mm (0.1 in.) box header to connect with the OEM connector. The connector pinout is shown

here:

When you connect the USB-7202 for the first time, a Found New Hardware message opens as the device is
detected. The installation is complete when the message closes.

After the USB-7202 is installed, the

Power LED remains on to indicate that communication is established

between the USB-7202 and your computer.

Caution! Do not disconnect any device from the USB bus while the computer is communicating with the

USB-7202, or you may lose data and/or your ability to communicate with the USB-7202.

If the Power LED turns off

If the Power LED is on but then turns off, the computer has lost communication with the USB-7202. To restore
communication, disconnect the USB cable from the computer, and then reconnect it. This should restore
communication, and the Power LED should turn on.

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USB-7202 User's Guide

Calibrating the hardware

Factory calibration

The Measurement Computing Manufacturing Test department performs the initial factory calibration. Contact
Measurement Computing for details about how to return your device and have it calibrated to the factory
specifications.

Field calibration

The USB-7202 supports field calibration. Calibrate the device using InstaCal whenever the ambient temperature
changes by more than ±10 °C from the last calibration.

9

Chapter 3

Functional Details

Analog input acquisition modes

The USB-7202 can acquire analog input data in three different modes – software paced, hardware paced, or
BURSTIO.

Software paced

You can acquire one analog sample at a time in software paced mode. You initiate the A/D conversion by
calling a software command. The analog value is converted to digital data and returned to the computer. You
can repeat this procedure for each channel desired until you have the total number of samples that you want
from each channel.

The maximum throughput sample rate in software paced mode is about 250 S/s, but may vary depending on
your system. You may receive OVERRUN errors at higher rates on some platforms. Using the BURSTIO
mode should resolve these problems.

Hardware paced

You can acquire data from up to eight channels simultaneously in hardware paced mode. The analog data is
continuously acquired and converted to digital values until you stop the scan. Data is transferred in blocks of
up to 32 samples from the USB-7202 to the memory buffer on your computer.

The maximum sampling rate is an aggregate rate, where the total sample rate for all channels is 100 kS/s
divided by the number of channels, with a maximum rate of 50 kS/s for any channel. Using this equation, you
can acquire data with the USB-7202 from one channel at 50 kS/s, two channels at 50 kS/s each, four channels
at 25 kS/s each, and so on, up to eight channels at 12.5 kS/s each. You can start a hardware paced scan with
either a software command or with an external hardware trigger event.

BURSTIO

When using BURSTIO, the USB-7202 can acquire data using the full capacity of its 32 kilosample FIFO. The
acquired data is then read from the FIFO and transferred to a user memory buffer on the computer. You can
initiate a single acquisition sequence for any number of input channels with either a software command or
with an external hardware trigger.

When BURSTIO is enabled, scans are limited to the depth of the onboard memory, as the data is acquired at a
rate faster than it can be transferred to the computer. The maximum sampling rate is an aggregate rate, where
the total acquisition rate for all channels is 200 kS/s divided by the number of channels. The maximum rate
for each channel is 50 kS/s. The maximum rate that you can acquire data using BURSTIO is 50 kS/s per
channel for one, two, or four channels, and 25 kS/s per channel for eight channels.

10

USB-7202 User's Guide Functional Details

1

Trigger/Sync connector

4

USB connector Pins 1-20

7

Pins 21-40

3

Power LED (top) and Status LED (bottom)

6

OEM connector

9

Sync jumper (P6)

Pin

Signal Name

Pin

Signal Name

1

N/C 2 VBUS

3

N/C 4 D-

5

N/C (do not connect anything to this pin)

6

D+

7

N/C (do not connect anything to this pin)

8

GND 9 N/C (do not connect anything to this pin)

10

SHIELD

Board components

The USB-7202 components are shown in Figure 2.

2 Pins 1-20 Trigger jumper (P6) 5 Pull-up/down jumper JP1 8 Trigger jumper (P7)

Figure 2. Board components

USB connector

The USB connector provides +5 V power and communication. The voltage supplied through the USB
connector is system-dependent, and may be less than 5 V. No external power supply is required.

This connector operates in parallel with the OEM connector — do not connect to both the USB connector and
the OEM connector.

OEM connector

The OEM connector operates in parallel with the USB connector — do not connect to both the USB
connector and the OEM connector.

The OEM connector is a 0.1" box header. Pins 2, 4, 6, 8, and 10 provide a USB connection, as listed in the
connector pinout below:

OEM connector pinout

Modifications are required to use the OEM connector

To use the OEM connector, create a USB connection via the OEM connector by populating two resistor
locations. The resistors you populate depends on the board revision. The board revision may be determined
from the part number label on the board that states "195729X-01L", where X is the board revision.

Revision D and later: populate R13 and R14 with 0402 size 22.1 Ω resistors.

Revision C and earlier: populate R30 and R36 with 0603 size 0 Ω resistors or provide solder bridges to close
the gaps.

11

USB-7202 User's Guide Functional Details

Pin

Signal Name

Pin

Signal Name

3

N/C 4 GND

5

SYNC

6

GND

7

N/C 8 GND 9 N/C

10

N/CD

Power

Steady green: the device microcontroller is connected to a computer or external USB hub.
Blinking green: boot loader mode.

Status

Steady green: boot loader mode.
Blinking green: data is being transferred over the USB bus.

Trigger/Sync connector

The Trigger/Sync connector provides two signals — SYNC and TRIG_IN. These signals are also available
on the screw terminal (refer to Trigger input on page 14

Trigger/Sync connector pinout

1 TRIG_IN 2 GND

Use a 0.1" box header when making connections to the Trigger/Sync connector.

The Trigger/Sync connector internally connects its SYNC and TRIG_IN pins to the screw terminal via
jumpers

P6 and P7.

for details about these signals).

Figure 3. Jumper P6 and P7 schematic

Sync jumper (P6)

The Sync jumper internally connects the SYNC pin on the Trigger/Sync connector to the SYNC pin on the
screw terminal. Remove this jumper on boards that will not send/receive the SYNC signal through the
SYNC/TRIG connector. Refer to Figure 2 on page 11 for the location of this jumper.

Trigger jumper (P7)

The Trigger jumper internally connects the TRIG_IN pin on the Trigger/Sync connector to the TRIG_IN pin
on the screw terminal. Remove this jumper on boards that will not send/receive the TRIG signal through the
SYNC/TRIG connector. Refer to Figure 2 on page 11 for the location of this jumper.

LED indicators

The USB-7202 has LEDs for power and communication status. See Figure 2 on page 11 for the location of
each LED.

LED type Indication

12

USB-7202 User's Guide Functional Details

Screw terminals

Screw terminal connections in shown in Figure 4.

Figure 4. Screw terminal pinout

Use 16 AWG to 30 AWG when making screw terminal connections.

Signal connections

Analog input

You can connect up to eight analog input connections to screw terminals CH0 IN through CH7 IN. Connect
unused analog input terminals to ground terminals during operation. All AI channels are configured for
single-ended input mode. The input voltage ranges are ±10 V, ±5 V, ±2.0 V, ±1.0 V.

Each analog signal is referenced to signal ground (AGND), and requires two wires:

 The wire carrying the signal to be measured connects to CH# IN.
 The second wire connects to AGND.

Digital I/O

You can connect up to eight digital I/O lines to screw terminals DIO0 to DIO7. Each digital bit is configurable
as either input or output. When configured for input, the digital I/O terminals can be used to detect the state of
any TTL-level input.

Pull-up/down configuration

The digital pins are configurable via jumper
On power up and reset the DIO pins are driven high.

JP1 for pull-up to USB +5 V (HI) or pull-down to ground (LO).

Figure 5. Jumper JP1 configuration

13

USB-7202 User's Guide Functional Details

For more information on digital signal connections

For more information on digital signal connections and digital I/O techniques, refer to the Guide to DAQ
Signal Connections (available for download from www.mccdaq.com/support/DAQ-Signal-

Connections.aspx.)

SYNC I/O

The SYNC connection is a bidirectional I/O signal that can be configured as an input (default) or an output.

 Configure as an external clock input to pace the A/D conversions from an external source. The SYNC

terminal supports TTL-level input signals of up to 50 kHz.

 Configure as an output to pace conversions on a second USB-7202.

The SYNC pin on the screw terminal is internally connected to the SYNC pin on the Trigger/Sync connector
(see page 12).

Trigger input

Use the digital trigger input (TRIG_IN) to start an acquisition when a rising or falling edge is detected on the
signal. This pin is internally connected to the TRIG_IN pin on the Trigger/Sync connector (see page 12).

Counter input

The CTR connection is a TTL-level input to a 32-bit event counter. The internal counter increments when the
TTL level transitions from low to high. The counter can count frequencies of up to 1 MHz.

Power output

The +5V

Caution! Do not connect to an external power supply to this terminal or you may damage the USB-7202

The maximum total output current that can be drawn from all USB-7202 connections (power, analog, and
digital outputs) is 500 mA. This maximum applies to most personal computers and self-powered USB hubs.
Bus-powered hubs and notebook computers may limit the maximum available output current to 100 mA.

The USB-7202 alone draws 150 mA of current from the USB +5 V supply. Once you start running
applications with the USB-7202, each DIO bit can draw up to 2.5 mA. The maximum amount of +5 V current
available for experimental use, over and above that required by the USB-7202, is the difference between the
total current requirement of the USB-7202 (based on the application) and the allowed current draw of the
computer platform (500 mA for desktop computers and self-powered hubs). For Revision C hardware and
earlier, this value shall not exceed 375 mA, based on the current rating of the Slo-Blo Fuse connected to the
+5V terminal; Revision D and later hardware was designed without fuses.

With all outputs at their maximum output current, you can calculate the total current requirement of the
USB-7202 USB +5 V as follows:

For an application running on a computer or powered hub, the maximum available excess current is
500 mA − 170 mA = 330 mA. This number is the total maximum available current at the
terminal. Measurement Computing highly recommends that you figure in a safety factor of 20% below this
maximum current loading for your applications. A conservative, safe user maximum in this case would be in
the 250 mA to 300 mA range.

connection is a 5 volt output that is supplied by the host computer.

USER

and possibly the computer.

(USB-7202 @ 150 mA) + (8 DIO @ 2.5 mA ea) = 170 mA

+5VUSER screw

Since some laptop computers running on battery power only allow up to 100 mA, the USB-7202 may be
above that allowed by the computer. In this case, you must either purchase a self-powered hub or operate the
laptop computer from an external power adapter.

14

USB-7202 User's Guide Functional Details

Ground

The analog ground (AGND) terminals provide a common ground for all analog channels. The digital ground

GND) terminals provide a common ground for the digital, trigger, counter, and sync channels and the power

(
terminal.

Accuracy

The overall accuracy of any instrument is limited by the error components within the system. Quite often,
resolution is incorrectly used to quantify the performance of a measurement product. While "16-bits" or "1
part in 65,536" does indicate what can be resolved, it provides little insight into the quality, or accuracy, of an
absolute measurement. Accuracy specifications describe the actual measurement that can be relied upon with
a USB-7202.

There are three types of errors which affect the accuracy of a measurement system:

 offset
 gain
 nonlinearity

The primary error sources in the USB-7202 are offset and gain. Nonlinearity is small in the USB-7202, and is
not significant as an error source with respect to offset and gain.

Figure 6 shows an ideal, error-free, USB-7202 transfer function. The typical calibrated accuracy of the USB­7202 is range-dependent, as explained in the Specifications chapter on page 19. We use a ±10 V range as an
example of what you can expect when performing a measurement in this range.

The accuracy plots in Figure 6 are drawn for clarity and are not drawn to scale.

Figure 6. Ideal ADC transfer function

The USB-7202 offset error is measured at mid-scale. Ideally, a zero volt input should produce an output code
of 32,768. Any deviation from this is an offset error. Figure 7 shows the USB-7202 transfer function with an
offset error. The typical offset error specification for the USB-7202 on the ±10 V range is ±1.66 mV. Offset
error affects all codes equally by shifting the entire transfer function up or down along the input voltage axis.

15

USB-7202 User's Guide Functional Details

The accuracy plots in Figure 7 are drawn for clarity and are not drawn to scale.

Figure 7. ADC transfer function with offset error

Gain error is a change in the slope of the transfer function from the ideal, and is typically expressed as a
percentage of full-scale. Figure 8 shows the USB-7202 transfer function with gain error. Gain error is easily
converted to voltage by multiplying the full-scale input (±10 V) by the error.

The accuracy plots in Figure 8 are drawn for clarity and are not drawn to scale.

Figure 8. ADC Transfer function with gain error

For example, the USB-7202 exhibits a typical calibrated gain error of ±0.04% on all ranges. For the ±10 V
range, this would yield 10 V × ±0.0002 = ±4 mV. This means that at full scale, neglecting the effect of offset
for the moment, the measurement would be within 4 mV of the actual value. Note that gain error is expressed
as a ratio. Values near ±FS (±10 V) are more affected from an absolute voltage standpoint than are values
near mid-scale, which see little or no voltage error.

Combining these two error sources in Figure 9, we have a plot of the error band of the USB-7202 at ±full
scale (±10 V). This plot is a graphical version of the typical accuracy specification of the product.

16

USB-7202 User's Guide Functional Details

The accuracy plots in Figure 9 are drawn for clarity and are not drawn to scale.

Figure 9. Error band plot

Synchronized operations

You can connect the SYNC pin of two USB-7202 devices together in a master/slave configuration and
acquire data from the analog inputs of both devices using one clock. When the SYNC pin is configured as an
output, the internal A/D pacer clock signal is sent to the screw terminal. If jumper P6 is installed, you can
output the clock to the SYNC pin of a second USB-7202 configured for A/D pacer input.

The SYNC pin is available on both the screw terminal connector and on the Trigger/SYNC connector (when
jumper P6 is installed). Refer to page 14 for more information about the SYNC pin.

17

USB-7202 User's Guide Functional Details

Mechanical drawing

Figure 10. Circuit board dimensions

18

A/D converter type

16-bit successive approximation type

Number of channels

8 single-ended

Input configuration

Individual A/D per channel

Sampling method

Simultaneous

Absolute maximum input voltage

CHx IN to GND

±15 V max

Input impedance

100 MΩ min

Input ranges

Software-selectable

±10 V, ±5 V, ±2 V, ±1 V

Sampling rate

Scan to system memory

0.6 S/s to 50 kS/s, software-selectable

BURSTIO scan to 32 k sample FIFO

20 S/s to 50 kS/s, software-selectable

Throughput

Software paced

500 S/s all channels, system-dependent

50 kS/s for any channel

BURSTIO scan to 32 k Sample FIFO

(200 kS/s) / (# of channels), maximum of
50 kS/s for any channel

Resolution

16 bits

No missing codes

15 bits

Crosstalk

Signal DC–25 kHz

–80 dB

Trigger source

Software-selectable

External digital: TRIG_IN

software.

±10 V

5.66

±5 V

2.98

±2 V

1.31

±1 V

0.68

±10 V

0.04

4.00

1.66

±5 V

0.04

2.00

0.98

±2 V

0.04

0.80

0.51

±1 V

0.04

0.40

0.28

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 input

Table 1. Analog input specifications

Parameter Conditions Specification

Chapter 4

Scan to system memory (Note 1)

Calibration Cal factors stored in firmware. Cal factors

Note 1: Maximum throughput scanning to system memory is machine dependent.

Table 2. Calibrated absolute accuracy

Range Accuracy (mV)

Table 3. Accuracy components - All values are (±)

Range % of Reading Gain error at FS (mV) Offset (mV)

(100 kS/s) / (# of channels); maximum of

must be applied to data via application

19

USB-7202 User's Guide Specifications

±10 V

10

1.52

±5 V

10

1.52

±2 V

11

1.67

±1 V

14

2.12

Digital type

CMOS

Number of I/O

8 (DIO0 through DIO7)

Configuration

Independently configured for input or output

configuration

Input high voltage

2.0 V min, 5.5 V absolute max

Input low voltage

0.8 V max, –0.5 V absolute min

(IOH = –2.5 mA)

Output low voltage
(IOL = 2.5 mA)

0.7 V max
Power on and reset state

Input

Trigger source (Note 2)

External digital

TRIG_IN

falling edge.

Trigger latency

10 µs max

Input high voltage

4.0 V min, 5.5 V absolute max

Input low voltage

1.0 V max, –0.5 V absolute min

Input leakage current

±1.0µA

Table 4 summarizes the noise performance for the USB-7202. Noise distribution is determined by gathering
50 K samples with inputs tied to ground at the user connector. Samples are gathered at the maximum specified
sampling rate of 50 kS/s.

Table 4. Noise performance

Range Typical counts LSBrms

Digital input/output

Table 5. Digital I/O specifications

Parameter Specification

Pull-up/pull-down

Output high voltage

All pins configurable via jumper (JP1) to Vs or ground via 47 kΩ resistors.

3.8 V min

External trigger

Table 6. External trigger specifications

Parameter Conditions Specification

Trigger mode Software-selectable Edge sensitive: user configurable for CMOS compatible rising or

Trigger pulse width 1µs min

Note 2: TRIG_IN is a Schmitt trigger input protected with a 1.5K Ohm series resistor.

20

USB-7202 User's Guide Specifications

Pin name

SYNC

Pin type

Bidirectional

Software-selectable direction

Output

Outputs internal A/D pacer clock.

Input

Receives A/D pacer clock from external source.

Input clock rate

50 kHz, max

Input

1µs min

Output

5µs min

Input leakage current

±1.0µA

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 3)

IOH = –2.5 mA

3.3 V min

No load

3.8 V min

IOL = 2.5 mA

1.1 V max

No load

0.6 V max

Pin name (Note 4)

CTR

Counter type

Event counter

Number of channels

1

Input type

TTL, rising edge triggered

Input source

CTR screw terminal

Resolution

32 bits

Schmidt trigger hysteresis

20 mV to 100 mV

Input leakage current

±1µA

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

Data FIFO

32,768 samples, 65,536 bytes

EEPROM

1,024 bytes

0x200-0x3FF

Read/write

512 bytes user area

External clock input/output

Table 7. External clock I/O specifications

Parameter Conditions Specification

Clock pulse width

Output low voltage (Note 3)

Note 3: SYNC is a Schmitt trigger input and is over-current protected with a 1.5 kΩ series resistor.

Counter

Table 8. Counter specifications

Parameter Specification

Note 4: CTR is a Schmitt trigger input protected with a 1.5 kΩ series resistor.

Memory

Table 9. Memory specifications

Parameter Specification

EEPROM configuration

Address range Access Description

0x000-0x1FF Reserved 512 bytes system and Cal data

21

USB-7202 User's Guide Specifications

Type

High performance 32-bit RISC microcontroller

Power LED (top)

On when the device microcontroller has power and is configured.
Blinks in boot loader mode.

Blinks to indicate USB communications.

OEM power

OEM connector; LED sink current up to 5 mA per LED @ 5 V

Supply current

USB enumeration

< 100 mA

Continuous mode

150 mA (Note 5)

+5V

power available

Connected to self-powered hub
Connected to externally-powered root port hub

4.0 V min, 5.25 V max
Output current (Note 7)

300 mA max

Device type

USB 2.0 (full-speed)

Device compatibility

USB 1.1, USB 2.0

DEFAULTS for

AInScan

Low channel = 0

Status = Idle

AITrig

Trigger polarity = Rising

CTR

Value = 0

Microcontroller

Table 10. Microcontroller specifications

Parameter Specification

Indicator LEDs

Table 11. Indicator LED specifications

Parameter Specification

Status LED On in boot loader mode.

max

Power

Table 12. Power specifications

Parameter Conditions Specification

USER

(Note 6)

Note 5: This is the total current requirement for the USB-7202, which includes up to 10 mA for the status LED.

Note 6: "Self-powered hub" refers to a USB hub with an external power supply. Self-powered hubs allow a connected

USB device to draw up to 500 mA. "Root port hubs" reside in the computer USB host Controller. The USB
port(s) on your computer are root port hubs. All externally-powered root port hubs (desktop computers) provide
up to 500 mA of current for a USB device. Battery-powered root port hubs provide 100 mA or 500 mA,
depending upon the manufacturer. A laptop computer that is not connected to an external power adapter is an
example of a battery-powered root port hub. If your laptop computer is constrained to the 100 mA maximum,
you need to purchase a self-powered hub.

Note 7: This is the total amount of current that can be sourced from the +5V





and digital outputs.

USER

General

Table 13. General specifications

Parameter Specification

programmable options and
"DEV:RESET/DEFAULT"
message

High channel = 0
Samples = 1000
Rate = 1000
Range = ±10 V
Pacer = Disabled (Slave)
Transfer mode = BlockIO
Trigger = Disabled

22

USB-7202 User's Guide Specifications

Operating temperature range

0 °C to 70 °C

Storage temperature range

–40 °C to 70 °C

Humidity

0% to 90% non-condensing

Dimensions (L × W × H)

90.17 × 95.25 × 12.70 mm (3.55 × 3.75 × 0.5 in.)

111.76 mm (4.40 in.) length with detachable screw terminals connected

USB cable length

3 m (9.84 ft) max

User connection length

3 m (9.84 ft) max

Connector type

Detachable screw terminal

Pin

Signal Name

Pin

Signal Name

1

CH0 IN

21

DIO0

2

AGND

22

GND

3

CH1 IN

23

DIO1

4

AGND

24

GND

5

CH2 IN

25

DIO2

6

AGND

26

GND

7

CH3 IN

27

DIO3

8

AGND

28

GND

9

CH4 IN

29

DIO4

10

AGND

30

GND

11

CH5 IN

31

DIO5

12

AGND

32

GND

13

CH6 IN

33

DIO6

14

AGND

34

GND

15

CH7 IN

35

DIO7

16

AGND

36

SYNC

17

N/C (no connect)

37

TRIG_IN

18

AGND

38

CTR

19

AGND

39

+5V

USER

20

AGND

40

GND

Environmental

Table 14. Environmental specifications

Parameter Specification

Mechanical

Table 15. Mechanical specifications

Parameter Specification

Screw terminal connector and pinout

Table 16. Connector specifications

Parameter Specification

Wire gauge range 16 AWG to 30 AWG

Table 17. Connector pinout

23

USB-7202 User's Guide Specifications

Connector type

10 position 2.54 mm (0.1 in.) box header

Pin

Signal Name

Pin

Signal Name

3

N/C 4 D–

7

N/C (do not connect anything to this pin)

8

GND 9 N/C (do not connect anything to this pin)

10

SHIELD

Connector type

10 position 2.54 mm (0.1 in.) box header

Pin

Signal Name

Pin

Signal Name

3

N/C 4 GND 5 SYNC

6

GND

7

N/C 8 GND

9

N/C

10

N/C

OEM connector and pinout (P4)

Table 18. OEM connector specifications

Parameter Specification

Table 19. OEM connector pinout

1 N/C 2 V

5 N/C (do not connect anything to this pin) 6 D+

Trigger/Sync connector and pinout (P5)

Table 20. Trigger/Sync connector specifications

Parameter Specification

Table 21. Trigger/Sync connector pinout

BUS

1 TRIG_IN 2 GND

24

Measurement Computing Corporation NI Hungary Kft
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