Teensy4 ADC Word Size

[joebobs0n]

I'm currently working on redesigning a project that utilizes the Teensy 3.2 to use the Teensy 4. The Teensy 3.2 in my design is used for analog data collection, as well as a number of other things. Pins A10 and A11 are currently being used as they support 16b analog acquisition. On the Teensy 4, which pins support 16b word length?

[joebobs0n]

For anyone interested, I did some testing with the Teensy 4 I just got in, and none of the ADC pins are 16b. All of them are 12b.

[tonton81]

you tried resolution change?

https://forum.pjrc.com/threads/41911...l=1#post132525

[joebobs0n]

Yes I did. Here's the code I used to test it.

#define READ_PIN A0

void setup() {
	analogReadResolution(16);
	analogReadAveraging(32);
}

void loop() {
	Serial.println(analogRead(READ_PIN));
	delay(1000);
}

It's not an elegant way of figuring it out, but it did the job. Basically, I manually changed the analog read pin in the code, uploaded the sketch, and then connected the pin under test to 3.3V.

Watching the serial monitor, it would read out a maximum of 4096 (2^12) instead of the expected 65536 (2^16).

[defragster]

For anyone interested, I did some testing with the Teensy 4 I just got in, and none of the ADC pins are 16b. All of them are 12b.

Indeed 12 bit - That was noted during development in the Beta T4 thread and the ref man AFAIK.