The Foxonix Fox is a development board built on the Sonix SNC21000 speech microcontroller. It's a platform that allows you to create and test programs that include your own custom sound content (speech, music, sound effects, etc.). It includes enough flash memory to store almost 3 minutes of good quality audio.

There are 16 I/O pins which can be configured in any combination of Inputs and Outputs. Four of these pins can be used for PWM functions.

It also includes a programming socket for loading your code onto the stand alone Project Board.

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Microcontroller Sonix SNC21000
Clock Speed 2 MHz
System Voltage 3.3V
Input Voltage (min - max) 4.5V - 20V
Input Voltage (recommended) 5V - 12V
Digital I/O 16
PWM I/O 4 of 16 (Port P3)
I/O Drive Current (P1, P2, P3.0, P3.1, P6) 4 mA
I/O Drive Current (P3.2, P3.3) 8 mA
I/O Sink Current (P1, P2, P3.0, P3.1, P6) 6 mA
I/O Sink Current (P3.2, P3.3) 16 mA
Registers (4-bit) 16
Flash Memory 16 Mbit
Board Dimensions 4.00 in. x 2.30 in.

Fox Board Schematic Rev. A


The Fox Board can be powered directly from the USB cable. Simply plug the USB cable into the board and set power selection jumper P1 to USB. The board can also be powered from a DC plug-in power supply or battery pack, with an input voltage in the 5V - 12V range. When using the DC power jack, power selection jumper P1 must be set to EXT.


3.3V System voltage generated by the on-board regulator
GND System Ground
P1.0 - P1.3 Port 1 I/O pins
P2.0 - P2.3 Port 2 I/O pins
P3.0 - P3.3 Port 3 I/O pins
P4.0 - P4.3 Port 4 I/O pins (NOT USED)
P5.0 - P5.3 Port 5 I/O pins (NOT USED)
P6.0 - P6.3 Port 6 I/O pins
PWM SPK Speaker Output for PWM Audio
DAC SPK1 Speaker Output for DAC Audio
P1 Power Selection Jumper
P3 Mini USB Connector
VO Voltage Out
DFU Device Firmware Upgrade Jumper
P12 Project Board Programming Socket