The ADS8698 is already used for a new design in a high voltage power supply unit and works very well. But there is one feature of this ADC i missunterstood and therefor one important feature of our PSU will not work - the software independent Alarm output. The original design idea was using the ADC for monitoring voltages and make an emergency shutoff if a value is out of range. After reading the datasheet more carefully the function of auto sequencing and alarmout is not running by the ADC itself but must be triggerd by SPI communication. So for security reason on our device when the software will hang there is nor more monitoring of the connected voltages. What was the TI idea how to use this alarm feature? if the mikrocontroller has to read the Adc values the comparsion against high and low limits can be done in software!?
Actually we hope our software will never hang..
So what is the correct usage of the value comparsion and alarm output of ths ADC? Maybe you have a idea how we can solve our mistake? (ofcourse , reading your datasheets mor carefully can help)
Thanks,
Ch.Merz