On Tue, Sep 22, 2015 at 7:38 PM, GaCuest gacuest@gmail.com wrote:
Hello everyone, I updated the block diagram. I would appreciate if someone can review it.
http://rhombus-tech.net/community_ideas/games_console/news/pcb_block_diagram...
ok so you liked the idea of being able to make a games controller from the same PCB, then? :) it would be really simple, a piece of plastic and a USB connector - done!
page 27: http://hands.com/~lkcl/eoma/kde_tablet/CM108_DataSheet_v1.6.pdf
i don't see a need for an EINT to the CM108AH.
ah, i see what it is: the EINT goes directly to the Audio Jack. it's the physical audio socket which has a "connection" which is broken/made by the physical insertion of a jack. that, in software, you would then notice.
actually what i've done in the hardware circuits i've made, is, although yes there is a connection there, i added in a resistor bridge into the circuit to bring the volume down when speakers are engaged. the CM108AH "normally" would drive the headphones (directly), but in "speaker" mode the L / R audio goes first to the headphones (where insertion of the jack would make it "cut out"), and from there (if no jack) it goes to the resistor-divider bridge to drop the voltage to 1/10th of its level, and *that* is fed into the TDA2822(s).
so actually, in the circuit that i have done, strictly speaking the EINT headphone is totally irrelevant... i just added it "just in case", also to be able to do user-alerts.
l.