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Measure the output voltage Measuring the output recambios de coches baratos online dating then yields the pin's voltage output level under the specified loading conditions.
Once this measurement has been taken, disconnect from the pin and repeat the process on the next.
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For a more detailed characterization, the load current can be swept through a list of values. To simulate such a load, the SMU is set to sink the desired current and then measure the resulting voltage.
The following steps assume that a SMU will be used to measure voltage output levels using a PXI to increase channel count.
Condition the DUT outputs to the logic-high state For a VOH test, each pin to be tested must first be set to be an output if it is bidirectional and to be in the logic-high state.
The following software versions were used to implement the tests: Hardware Setup The essential connections for performing voltage output tests using this PXI system are relatively simple. The front panel of the attached example code allows the user to control the settings of the SMU and HSDIO instrument along with reading back the measured current draw of the device.
The only differences are that pin under test must be preconditioned into the logic-low state, and the SMU must be set to source current into the chip to simulate another chip's pin driving circuitry.
Then repeat the process of switching to each pin and measuring the voltage. Voltage output low VOL tests are performed with the identical hardware configuration. Similarly, for a VOL test, each pin to be tested must first be set to an output logic-low state.
Back to Top 2. Then, the SMU can be used as a constant-current load on that pin to simulate the current loading of another digital device in the chip's final environment.
Output Voltage Level Testing Technical Details (VOH, VOL)
Pins that cannot source enough current to keep up with the load will have significantly lower output voltages, so measuring the voltage output level indicates weak or faulty output circuitry. Setting a current limit is highly recommended to prevent damage to the DUT.
Disconnect all switch channels and close switch session. This paper will describe such a test using a PXIe Source Measure Unit being used as the load as well as the measurement device.
Show a histogram of the pin measurements and display the individual values in table. The individual routes to each pin on the device under test are retrieved from the route group specified, and used later to make the connections.
Table of Contents
Software Setup Overview This document will discuss the technical details of testing the voltage output thresholds of digital semiconductor devices using a test system created using the PXI platform. To learn more about the software components of this test system, click here.
This paper will describe, in detail, the process of testing the voltage output levels on a packaged semiconductor chip. Set the SMU to draw a small negative current to act as a load for each output pin under test.
This will allow a VOH test to be performed on those pins. Initialize the PXIe based on the resource name, then set the utility channel to power your device by changing the voltage set point to the desired VDD. Before any pin is connected, the SMU should be set to source or sink the desired current, then, once the pin under test has been connected a voltage measurement should be performed.
In this manner, the voltage output levels, and in turn the health of the output transistors, on each digital pin can be tested.
Since steps 1, 2 and 3 condition the device under test as well as the SMU into the appropriate state, switching to the pin under test will put the system in a measurement-ready state.
The output voltage will then be measured and listed for each pin in future steps.
Output Voltage Level Testing Technical Details (VOH, VOL) - National Instruments
Typically values of load current vary from hundreds of microamps to tens of miliamps. Switch to the next pin and repeat Repeat steps 4 and 5 for each output pin under the device under test and pass the results out as an array for easy analysis.
Software Setup For simplicity, only the voltage output high VOH parameter is tested in the code shown below. Also remember to set the current limit to the max allowable current in order to protect your device and test setup.
Voltage output testing can be conducted on a wide range of devices from digital semiconductor chips to fully integrated consumer electronics devices.
Initialize a session to the matrix switch via NI Switch Executive. Using an SMU to act as a load allows for accurate testing of voltage outputs at a variety of constant current loading conditions, or even to characterize the output voltage as a function of load current by performing a sweep.
Test Setup for Voltage Output Levels For a voltage output high VOH test on a particular pin as shown abovethe pin under test must first be conditioned to a logic-high output state. Automated Test Steps Step 1: Pins that cannot sink enough current will have their voltage output low value significantly higher than 0 V or VSS.
To add tests for VOL, incorporate additional steps to this code to condition the DUT to have logic-low outputs and the SMU to source current instead of sinking current.
To learn more about the hardware components of this test system, click here. Once all settings are configured, enable the output of the utility channel in order to provide power to the device under test.
Connect the DUT pin to be tested For an automated test system, tens or hundreds of pins must often be tested for voltage output levels, making high-density switching a necessity.
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