Table Of Contents

Pin Values

Version:
    Last Modified: November 23, 2020

    Use the following guidelines when setting pin values within a pin levels sheet in your project.

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    Note  

    When specifying levels, specify them from the perspective of the DUT, not the digital pattern instrument.

    Digital Pins

    • Pin Item—Specifies the name of a digital pin or pin group defined in the pin and channel map.
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      Note  

      Digital Pattern Editor does not support using system pins in patterns. To burst from a pin that spans all sites, configure a pin with a shared pin connection in the Pin Map Editor to share a channel across multiple sites and use that pin in your pattern instead.

    • VIHSpecifies the voltage that the instrument applies to the input of the DUT when the instrument drives a logic high (1).
    • VILSpecifies the voltage that the instrument applies to the input of the DUT when the instrument drives a logic low (0).
    • VOHSpecifies the DUT output voltage above which the comparator on the instrument pin interprets a logic high (H).
    • VOLSpecifies the DUT output voltage below which the comparator on the instrument pin interprets a logic low (L).
    • Termination Mode— Specifies the behavior of the pin when the pin function is set to digital and the pin state for the current cycle is not a drive state. Use the drop-down menu to select one of the following modes:
      • Blank/Empty Space—Specifies to leave the termination mode unchanged.
      • High Z— Specifies that, for non-drive pin states (L, H, X, V, M, E), the pin driver is put in a high-impedance state and the active load is disabled. This is the default setting.
      • VTERM—Specifies that, for non-drive pin states (L, H, X, V, M, E), the pin driver terminates the pin to the configured VTERM voltage through a 50 Ω impedance. VTERM is adjustable to allow for the pin to terminate at a set level.
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        Note  

        This is useful for devices that operate incorrectly when an instrument pin is unterminated and floats to any voltage level within the instrument voltage range. Setting VTERM to 0 V and selecting the VTERM termination mode has the effect of connecting a the termination to ground, which provides an effective 50 Ω impedance for the pin. This improves signal integrity by reducing reflections while the DUT drives the pin.

      • Active Load— Specifies that, for non-drive pin states (L, H, X, V, M, E), the active load is connected and the instrument either sources or sinks a defined amount of current to load the DUT. The voltage at which the instrument changes between sourcing and sinking is specified by VCOM. The amount of current sourced by the instrument and sunk by the DUT is specified by IOL. The amount of current sunk by the instrument and sourced by the DUT is specified by IOH.
    • VTERMSpecifies the termination voltage the instrument applies during non-drive cycles when the termination mode is set to VTERM. The instrument applies the termination voltage through a 50 Ω parallel termination resistance.
    • VCOMSpecifies the commutating voltage level at which the active load circuit switches between sourcing current and sinking current.
    • IOLSpecifies the current that the DUT sinks from the active load while outputting a voltage below VCOM.
    • IOHSpecifies the current that the DUT sources to the active load while outputting a voltage above VCOM.
    • Comment—Specifies a text description for the digital pin or pin group level set. This field does not accept the <Enter> or <Tab> keys.

    Power Pins

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    Note  

    Loading level values on the instrument only changes the values of VF and IF. Use the Pin View pane or external code in a test program to specify whether the NI-DCPower instrument is the active source of current, voltage, or neither for the pin.

    • Pin Item—Specifies the name of a the power pin or pin group defined in the pin and channel map.
    • VF—Specifies the voltage to force on the specified pin connected to an NI-DCPower instrument.
    • IF—Specifies the current to force on the specified pin connected to an NI-DCPower instrument.
    • IC — Specifies the maximum limit for the current at the pin when the NI-DCPower instrument forces voltage to the DUT. This value is enabled when the NI-DCPower instrument is in Force Voltage mode.
    • VC — Specifies the maximum limit for the voltage at the pin when the NI-DCPower instrument forces current to the DUT. Enabled only when the NI-DCPower instrument is in Force Current mode.
    • I Range—Specifies the current range to use. Select a range from the pull-down menu.
    • V Range—Specifies the voltage range to use. Select a range from the pull-down menu.
    • Sense—Specifies the method used when collecting output and voltage measurements.
      • Local—Use a single set of connections for output and voltage measurement.
      • Remote—Use two sets of connections for output and voltage measurement.
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        Note  

        Remote sense measurements are appropriate for high-current applications. Remote sense enables more accurate voltage output and measurements when the output lead voltage drop is significant.

      • Comment—Specifies a text description for the power pin or pin group level set. This field does not accept the <Enter> or <Tab> keys.

    PPMU Pins

    • Pin item—Specifies the name of a digital pin or pin group defined in the pin and channel map.
    • VF—Specifies the voltage to force on the specified pin connected to an NI-Digital instrument.
    • IF—Specifies the current to force on the specified pin connected to an NI-Digital instrument.
    • VCH—Specifies the nominal voltage at the specified pin at which the high-side voltage clamp activates when the PPMU applies current to the DUT.
    • VCL—Specifies the nominal voltage at the specified pin at which the low-side voltage clamp activates when the PPMU applies current to the DUT.
    • I Range—Specifies the current range to use. Use the drop-down menu to select a range.
    • Comment—Specifies a text description for the power pin or pin group level set. This field does not accept the <Enter> or <Tab> keys.

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