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Pico Communications E-14 Computer Hardware User Manual

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E‐14HardwareReferenceManual www.picocomputing.com PicoComputing,Inc.

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15

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DigitalPeripheralInterface

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ThePicoE‐14features16GPIOlinesthatareusedforexternalperipheralsupport.PullingtheDIAG_EN

pinlowreplaces4GPIOsignalswithJTAGsignals.

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AllGPIOsignalshaveuserselectablepull‐up,pull‐down,keeperorHI‐Ztermination.Drivestrengthis

alsouserselectablebetween2and24mA.AllGPIOscanbeconfiguredforinput,outputandbi‐

directionalmodeandareequippedwithESDprotection.

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DIAG_ENState JTAG GPIO

Float/High Disabled Enabled

Low Enabled Disabled

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ElectricalSpecifications Minimum Nominal Maximum

HighVoltage 1.7V 2.5V 2.9V

LowVoltage‐0.2V 0V 0.7V

InputImpedance(PulldownsDisabled) HI‐Z

DriveStrength(Selectable) 2mA 24mA

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ESDWithstandVoltage(HumanBodyModel)  2KV

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