Pico Communications E-15 manual Digital Peripheral Interface, Hi-Z

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Digital Peripheral Interface

The Pico E-15 features 2 GPIO lines which are used for external peripheral support. The GPIO lines are always enabled.

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.

GPIO 1 has a 50 ohm resistor in series with the output to allow connectivity with low voltage devices which may clamp a 3.3V signal.

Electrical Specifications	Minimum	Nominal	Maximum
High Voltage	2.0V	3.3V	3.45V
Low Voltage	-0.2V	0V	0.8
Input Impedance (Pulldowns Disabled)		HI-Z
Drive Strength (Selectable)	2 mA		24 mA
ESD Withstand Voltage (Human Body Model)			2 KV

Pico E-15 Hardware Reference	www.picocomputing.com	Pico Computing
	(206) 283-2178	150 Nickerson Street. Suite 311
		Seattle, WA 98109