2003-09-25 05:04 AM
2003-09-03 12:09 PM
The document AN1313 states that there isn't a software difference between the anlog to digital converters of the ST269 and ST168 but when I look at the data sheets, the tcc value is off by a factor of two for a given ADSTC setting.
Wouldn't we have to take this into account when porting to the ST269 so that we maintain the same sample time?2003-09-25 05:04 AM
In fact the total conversion time is the same. It is a ''documentation'' trick. 2 timings are defined depending on the doc you will have: either tsc (sample clock) or ts (sample time) with ts = 2x tsc.
Then sometimes the formula for the total conversion time is: either tc = 14 tcc + ts +4 TCL either tc = 14 tcc + 2 tsc + 4 TCL In summary, for both devices the formula is: tc = 14 tcc + 2 tsc + 4 TCL and tsc = tcc for ADSTC = 00 tsc = 2 tcc for ADSTC = 01 tsc = 4 tcc for ADSTC = 10 tsc = 8 tcc for ADSTC = 11