Digital peripheral interface – Pico Communications E-14 User Manual
Page 15
E‐14 Hardware Reference Manual
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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