Pico Communications E-14 - Manual (Page 15)

E‐14 Hardware Reference Manual www.picocomputing.com Pico Computing, Inc.
15
Digital Peripheral Interface
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.
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.
DIAG_EN State JTAG GPIO
Float / High Disabled Enabled
Low Enabled Disabled
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
ESD Withstand Voltage (Human Body Model) 2 KV