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sigma i-usb problem with adau cluster

SigmaDSP & SigmaStudio alex239 Sep 25, 2020 00:00 2 replies Original on forum ↗
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alex239 Question
Sep 25, 2020 00:00

I have done proto pcb with cluster of (adau 5 pts.) its work bad with sigma iusb. i produced my iusb with need pinout/ and the same problem. i thought that its problem of pcb. but no.

all five adau works perfectly and load from uC on 10 mhz. but only one works normally in sigma.

i have tested on oscilocope. and its normally.

second i tested a type of signal and found next. spi type of signal are different. i use spi mode 3. iusb seems use spi mode 0 .(spol=0) cpha i didnt check. on datasheet on adau146x slavespi use mode 3. so i cant understand how it works.

Ken.M Reply
Sep 30, 2020 00:00

How have you connected SPI to the USBi, especially the /SS lines? Can you show the relevant portion of your schematics?

Ken

alex239 Reply
Sep 30, 2020 00:00

i can send it.

its have 8 switch. SS1-SS5 miso mosi clk. i have check all signals its ok.

when logic switched to uC all adau they all works perfectly. usbi works normally only with latch 1. and only with one DSP.