Hello,
I have to drive external load at 3V, 24 mA.
In the design, I will insert an Uln2803 driver.
BTW, is it possible to simply use more than one GPIO pin ?
I dream about this schema:
[modified to limit current on EACH pin.]
(diode)
GPIOx------>|----(resistor 470 Ohms)----------+
|
GPIOy------>|----(resistor 470 Ohms)----------+-(load)--Gnd
|
GPIOz------>|----(resistor 470 Ohms)----------+
so, current from each pin is approximatively limited to 7mA.
Does anyone could confirm ?
Regards.
PO.
Post-Scriptum: According to the answer below from Olimex, I read Chapter 37 and table 2.8 in: http://www.freescale.com/files/dsp/doc/ref_manual/IMX23RM.pdf . At this time I have not found the maximum power available.
generally yes, just look in the user manual or datasheet what is the max current which could be sourced from one port group.