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ADC Feature Comparison

The Apalis/Colibri modules (except the Colibri PXA300) have 4 dedicated analog inputs.

As there are different chips implementing the ADC functionality on the different modules, there are slightly different attributes which need to be considered for compatibility amongst the full range of Apalis/Colibri modules:

ModuleRevisionConverter ChipADC ResolutionInput Voltage Range
Apalis iMX6allSTMicroelectronics STMPE81112bits0..3.3V
Apalis T30allSTMicroelectronics STMPE81112bits0..3.3V


ModuleRevisionConverter ChipADC ResolutionInput Voltage Range
Colibri iMX6allSTMicroelectronics STMPE81112bits0..3.3V
Colibri PXA270older than V2.0UCB140010bits0..7.5V
Colibri PXA270V2.0 and newerWM9715 12bits0..3.3V
(Channel AD2: 5V)
Colibri PXA300allnoneN/AN/A
Colibri PXA300 XTallWM9715 12bits0..3.3V
(Channel AD2: 5V)
Colibri PXA310allWM9715 12bits0..3.3V
(Channel AD2: 5V)
Colibri PXA320
Colibri PXA320IT
older than V2.0UCB140010bits0..7.5V
Colibri PXA320
Colibri PXA320IT
V2.0 and newerWM9715 12bits0..3.3V
(Channel AD2: 5V)
Colibri T20allWM9715 12bits0..3.3V
(Channel AD2: 5V)
Colibri T30allSTMicroelectronics STMPE81112bits0..3.3V
Colibri VF50/VF61allNXP/Freescale Vybrid12bits0..3.3V

Software Support

We provide a library to access the ADC channels.

One sample measurement on one channel takes about 450-550us for codec types UCB1400 and WM9715.
The analog inputs are implemented with the resistive touch H/W. Touch events can lead to increased ADC channel sampling intervals.

External ADC

If you need a faster(high sampling rate) or more precise ADC(higher resolution) or ADC with more channels, you can add another external ADC chip. The Colibri module has different interfaces(I2C, SPI, etc.) to connect an ADC, a very common one is the SPI interface.

Example of ADCs:

  • Microchip ADC chips
  • Texas Instruments ADC Chips
  • Analog Devices ADC Chips