Olimex Support Forum

OLinuXino Android / Linux boards and System On Modules => iMX233 => Topic started by: flipflops on February 08, 2013, 05:27:35 AM

Title: which GPIOs?
Post by: flipflops on February 08, 2013, 05:27:35 AM
I am working with the maxi board and I see in the literature that there are 20 GPIO pins available to Linux. I plan to drive ten 2.5v SSRs directly from the GPIOs so my questions are:

Are there any specific GPIO pins that will have less of an impact on other functions? More specifically, are there certain pins that I should avoid using because they are reserved by other functions like LCD output?

How much amperage is available to the Linux accessible GPIOs? Will I have a problem driving ten 2.5v SSRs like the following?

http://www.sainsmart.com/8-channel-5v-solid-state-relay-module-board-omron-ssr-4-pic-arm-avr-dsp-arduino.html

And can I use the 5v power GPIO to power the 5v input of the aforementioned SSR board?

Thanks
Title: Re: which GPIOs?
Post by: Fadil Berisha on February 09, 2013, 04:15:38 AM
Hi flipflops,

Most likely you can connect ten 2.5V SCR inputs on ten separate 3.3V output pin's. 
Please download reference manual IMX23RM.pdf. There you will find answers
-how pins are multiplexed in multiple functions and GPIO,
-what is max current on GPIO, etc.
 
 
 
Title: Re: which GPIOs?
Post by: flipflops on February 11, 2013, 05:53:12 AM
Thanks