Other Parts Discussed in Thread: TMS320F28375S, ADS7952
I am using the ADS7952 with a TI DSP (TMS320F28375S) in an inverter application. Everything works correctly most of the time. I am able to read the ADC values correctly in Manual mode.
When our inverter enables it does create more electrical noise in the system.
What I am experiencing is that the ADS7952 seems to lockup and not respond to the SPI port anymore. It does not do this every time, just occasionally.
I have confirmed on a scope that the DSP is producing CS/SCLK/MOSI signals when in this locked up condition. The SDO/MISO signal from the ADS7952 is just stuck low when in this locked up condition.
If I recycle power to the chip it starts operating normally again.
Wondering if there were any ideas on what might cause this and if there are perhaps some critical layout issues that should be looked at?
If the ADS7952 were to get some bad data sent to it would it cause it to lock up or get into a mode that wouldn't respond?
Is there some particular sensitivity to noise?