Hi,
When the ADC chip is set into Test Mode 3 (TM[1:0] 11), the RANGE bit settings can be changed without any problem. When a new conversion is occurred after changing the settings of RANGE bit, the output with the new RANGE settings is shown.
However it is not the same when the ADC is operated in normal mode (TM[1:0] 00).
During this mode, after changing the RANGE settings of the ADC from one settings to another (For example from 00 to 11), and a new conversion occurs, the ADC output still gives the range settings of 00 instead of 11.
While operating the ADC in normal mode, there is an fixed amount of charge dumped into the integrator externally.
I would like to know if there is anything that I have missed out anything that is required to do in order to change the RANGE settings during normal mode. Thank you very much.
Best Regards,
Vincent Siah