Key Digital ES381 manual Input Control

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2.4 Input Control

2.4.1 Input Supply

The USBcount50 supports a programmable input supply via the slider control.

Supplies from 1.50V to 5.00V are possible, and the slider control adjusts in 256 steps of 13.67mV per step. This range allows the user to match against common industry standard logic levels present in their circuit to be measured6.

6Note that the input switching threshold is not a linear function of the supply voltage, rather the threshold varies in steps as the supply voltage is increased, corresponding to the Vih specifications for 1.8V, 2.5V, 3.0V, 3.3V and 5.0V logic domains.

Elan Digital Systems Ltd.

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USBcount50 USER’S GUIDE Iss1

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Contents USER’S Guide Contents Software Page Overview General Figure below shows a simplified diagram of the USBcount50 Using More Than One USBcount50 This is a safety critical point so please note it carefully Disassembling The Stack USB Connections For Stacked Configurations USBcount50 USER’S Guide Iss1 Stacking Do’s And Don’ts USBcount50 /MISpc USBcount50 USER’S Guide Iss1 Input Control Counter Modes USBcount50 USER’S Guide Iss1 Frequency Mode Falling Falling Rising Falling Rising Rising USBcount50 USER’S Guide Iss1 Before plugging in the hardware 2 channel example is shown USBcount50 USER’S Guide Iss1 Windows 2K and XP10 13 a 1 channel example is shown USBcount50 USER’S Guide Iss1 Troubleshooting Power Requirements Performance Performance Software
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