Greetings, Not sure what to do with this info yet, so I'll get it off a scrap of paper and into the archives for future reference. Winbond internally scale 5V readings in terms of resistor values. Some chips monitor 5V, others monitor 5VSB too, I've assumed one chip (w83781d) does same as later chips in same family as no datasheet spec. Sensor drivers do not scale these values so user-space need choose correct compute lines depending on chip and which 5V being measured. Datasheet summary ----------------- First set operate from 5V and have 16mV/lsb A/D --> 4096mV fullscale. chip 5V 5VSB W83781D 34/50 - W83782D 34/50 - W83783S 34/50 - W83L784R 34/50 - W83627HF 34/50 17/33 W83697HF 34/50 17/33 W83627THF 34/51 34/51 W83637HF 34/51 34/51 Next one operates from 3.3V and has 8mV/lsb A/D --> 2048mV fullscale chip 3.3V 3.3VSB W83627EHF 34/34 34/34 This chip supplies Vref = 2.048V and the reccomended external divider values have changed, _not_ to same ratios as before. The reference to "8-bit ADC with 16mV LSB" on block in circuit diagram appears a typo, as many other places refer to new 2.048V fullscale. No mention of 5V. example compute lines --------------------- divider 34/50 compute in3 (42 / 25) * @, @ / (42 / 25) 17/33 compute in? (50 / 33) * @, @ / (50 / 33) 34/51 compute in? (85 / 51) * @, @ / (85 / 51) 34/34 compute in? 2 * @, @ / 2 If i made boo-boo, no doubt I'll be corrected :p --Grant.
