On this page
https://www.pjrc.com/store/teensylc.html
is written:
"The AREF pin is used to set the analog input range. By default, AREF is 3.3V due to a resistor. External shunt-type reference chips may be connected for lower reference voltage."
This is wrong. There is no resistor connected to the AREF pin, neither on the board nor on the chip. A shunt reference won't work without an external resistor.
Michael
https://www.pjrc.com/store/teensylc.html
is written:
"The AREF pin is used to set the analog input range. By default, AREF is 3.3V due to a resistor. External shunt-type reference chips may be connected for lower reference voltage."
This is wrong. There is no resistor connected to the AREF pin, neither on the board nor on the chip. A shunt reference won't work without an external resistor.
Michael