According to the "Teensy Technical Specifications" web page (www.pjrc.com/teensy/techspecs.html), the current output per "Breadboard I/O" pin is 10mA, but the Teensy 4.0 page (www.pjrc.com/store/teensy40.html) says "The recommended maximum output current is 4mA". The datasheet at www.nxp.com/docs/en/data-sheet/IMXRT1060XXEC.pdf doesn't list the usual absolute maximum current for the I/O pins. Table 22 on page 33 says a "typical" value is 4mA, but with a voltage drop from VDDE of 0.45V.
Unfortunately, I based a design on the former web page and didn't notice the lower current on the latter 4.0 page. A Teensy 4.0 is driving a solid state relay using pin 3. The relay is drawing about 8mA and the drop from VDDE is only 0.124V. I'm hoping that tiny voltage drop is an indication that the circuit is sound. I've got about nine of them installed 300 miles away.
Anybody have any long term experience using greater than 4mA from an I/O pin on a 4.0? @Paul?
Thanks!
Sid
Unfortunately, I based a design on the former web page and didn't notice the lower current on the latter 4.0 page. A Teensy 4.0 is driving a solid state relay using pin 3. The relay is drawing about 8mA and the drop from VDDE is only 0.124V. I'm hoping that tiny voltage drop is an indication that the circuit is sound. I've got about nine of them installed 300 miles away.
Anybody have any long term experience using greater than 4mA from an I/O pin on a 4.0? @Paul?
Thanks!
Sid