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National Instruments USB-8451 USB I2C/SPI/SMBus master interface
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National Instruments · USB

USB-8451

The NI USB-8451 connects a USB host to I2C, SMBus and SPI devices as a master interface. Eight general-purpose digital I/O lines support additional control tasks.

ManufacturerNational Instruments
ModelUSB-8451
Part Number779553-01 · 779553-50
Product TypeUSB I2C/SPI/SMBus master interface
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Free Shippingfull policy linked
30-Day Warrantystandard coverage
30-Day Returnspolicy applies
Technical Supportmodel & compatibility help
Maximum I2C clock250 kHz
Maximum SPI clock12 MHz
Digital I/O8 software-configurable lines
External circuit power+5 V output, 230 mA maximum
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Overview

Product overview

Key product information and technical features.

The USB-8451 provides USB-based communication with serial-bus integrated circuits and consumer electronics. Its portable format allows placement near the target circuit to help shorten I2C wiring.

NI documents LabVIEW communication examples using NI-845x software, including SPI access to an AT25080A EEPROM.

  • Master communication with I2C, SMBus and SPI peripherals.
  • Individually selectable digital input or output direction.
  • Eight SPI chip-select outputs.
  • Provides power and ground connections for suitable external circuits.
Verified specifications

Technical data

Verified product specifications.

Maximum I2C clock rate250 kHz
Maximum SPI clock rate12 MHz
SPI transfer size8 bits
General-purpose digital I/O lines8 lines
USB signalingFull-speed
External power output current230 maximum mA
External power output voltage4.10 minimum to 5.25 maximum V
Operating temperature0 to 45 °C
Condition & included items

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Condition

Confirmed per unit.

Included

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Revision

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Compatibility

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National Instruments

Manufacturer

USB

Host connection

USB-8451

I2C/SPI/SMBus master interface

Software example

NI provides a LabVIEW SPI tutorial using NI-845x software.

Confirm the physical variant and target-device electrical requirements before selecting wiring.
Manuals & software

Technical resources

Manuals, software and technical resources for this model.

USB-8451 Product PageProduct Page · ni.com
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USB-8451 SpecificationsSpecifications · ni.com
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USB-8451 Dimensional DrawingsDrawings And CAD Resources · ni.com
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NI USB-8451, Atmel AT25080A, and the LabVIEW SPI APITechnical resource
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Difference Between USB-8451 and USB-8452 in I2C ModeTechnical resource
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Shipping, warranty & returns

Commercial terms

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Shipping
Free Shipping. Full policy terms apply.
Warranty
30-Day Warranty. Standard coverage applies.
Returns
30-Day Returns. Return policy applies.
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FAQ

Product-specific questions

Product-specific answers based on available technical information.

Does the USB-8451 support I2C slave operation?

No. NI identifies the USB-8451 as not supporting I2C slave operation.

Does the USB-8451 have onboard I2C pull-up resistors?

No. NI lists no onboard pull-ups for the USB-8451; account for external pull-ups when designing the I2C connection.

Can it power a connected integrated circuit?

Its +5 V output can supply up to 230 mA. Check the target circuit's voltage and current requirements before connecting it.

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