Programming the eeprom without the DSP
So, I have my board all ready to go, circuit is similar to the ADAU1701 mini dev board in most respects, got a 24LC256 hooked up, NOT got the 1701 in soldered down yet, figured I would get what I can checked out first.
ADDR 0 and ADDR1 will be fixed low on the DSP, WP has been tied high (with the option of setting it high during initial programming) to prevent the DSP ever writing to the EEPROM.
Without the 1701 glued in, im having difficulty getting SigmaStudio to write to the EEPROM, it says it is writing, but the readback and verify fails,
Should this work with the 1701 not connected, or does SigmaStudio rely on the 1701 being bus-master etc, so I should not expect to be able to programm the EEPROM until the 1701 is soldered down?
Audio Signal Processors
SigmaDSP Audio Processors
adau1701
Solved
Hi rszemeti,
I apologize for my late response. I was out of the office on vacation last week.
As I'm sure you discovered, you don't need the SigmaDSP to be on the I2C bus when programming the self-boot EEPROM. The USBi will address the EEPROM directly.
Thanks,
Brett
Yes thanks, I figured that out .. and when I figured out I had SCL and SDA swapped over, it even worked!
My current problem is trying to figure out why the ADC3 input when fed with a pot off the AGND and 3V3 rails, still allows some audio through when used to control a variable gain cell and turned fully down. as far as I can tell, the pot is going all the way to 0v. Do I need to detect low level voltages and trigger a clickless mute to ensure no audio gets out when the pot is turned all the way down, or should it work as is, and I need to check my earth points?
ps. If you have any method of feeding documentation corrections back to the documentation team, you may care to note that in the ADAU1701 datasheet, the preferred digital output filter circuit shown in the documentation with a 470uf capacitor in the positive feedback loop ... has mysteriously become a 470pf capacitor on page 50 (self boot schematic) ...
rszemeti wrote:
ps. If you have any method of feeding documentation corrections back to the documentation team, you may care to note that in the ADAU1701 datasheet, the preferred digital output filter circuit shown in the documentation with a 470uf capacitor in the positive feedback loop ... has mysteriously become a 470pf capacitor on page 50 (self boot schematic) ...
Thanks! I have made a note of that on the documentation update to-do list.
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