I am developing a wi fi controller that would utilize imp005 module. I am currently in a schematic phase and have question about Imp005 BlinkUp circuitry. In Hardware design section for Imp005 on the web, there is a simple BlinkUp circuit that uses 2 pins (OPTO_BIAS and OPTO_IN). However, I am not sure which exactly are those pins on imp005 module. If we look at the Imp005 Breakout board schematic, we can see something that looks to me like an oscillator circuit (Free run BlinkUp)… I assume that circuit is only for BlinkUp presentation, not really useful for practical stuff?
And it seems to me that OPTO_IN pin would be A50 (I2S0_SD_IN), but what would be OPTO_BIAS on our module (considering A51/BLINKUP_EN is active low)? Any GPIO that should be driven high (supposed it could provide enough amount of current), or could it be +3V3 power rail?
I appreciate any help!