ADAU1452 Voltage Controlled SPI Delay issues?

Dear EZ,

i've been using VC SPI delay cell in several projects but i always run into problems.

Most of the time when this cell is used into a schematic and EEPROM is stored with data i have issues with erasing the EEPROM and/or downloading a new program to DSP/EEPROM. If i remove the VC SPI Delay cell download of program to DSP/eeprom works again.

Whenever i run in such a problem i have to power off the DSP board, remove delay cell from schematic, erase the eeprom from DSP, add back the delay cell to schematic and if i'm lucky i can download new programs to DSP once again. Sometimes it takes me hours before i can make it work again. It's quite frustrating when it happens.

One more issue happens when a program with VC SPI delay is stored in bootload eeprom and at power on of the DSP board white noise appears on the output. It's like if a short burst of noise signal is applied to VC SPI delay input. I usually mute the delay output via MCU at power on to avoid noise but it's an annoying thing.

I think it's some sort of programming issue with the external RAM IC cause, when it happens, if i switch to a different hardware (with same RAM IC) communication to DSP works back again.

Can you check?

Thank you!

Omar

ADAU1452 board is custom one,

Sigma Studio is 4.2

RAM is 23LC1024

EEPROM is 25AA1024

Audio Signal Processors

adau1452

bug_report

spi

sigmastudio

SigmaDSP Audio Processors

delay

Show More