On Thu, 14 Nov 2013 10:58:37 -0800, Guenter Roeck wrote: > On Thu, Nov 14, 2013 at 04:36:46PM +0100, Björn Gerhart wrote: > > Hi, > > > > I'm about to test the new NCT6106D part of the Nuvoton nct6775 driver. > > However, I experience a strange behaviour concerning the maximum > > thresholds of in1 (wiring: +5V at chip's VIN0, 15/10 resistor ratio) and > > in4 (wiring: +12V at chip's VIN1, 110/22 ratio). The behaviour is as > > follows: > > Those scaling factors don't really work. VIN0 and VIN1 have a maximum > input range of 2.048V. With your scaling factors you don't really get > to the limits you are trying to set. Maximum for 5V is 2.048 * 2.5 = 5.12V, > and maximum for 12V is 2.048*6 = 12.228V. So, in practice, what you see > is that the ADCs for both inputs are maxed out, which also explains > why you can not set the maximum higher than the actual voltage. > > If this is a third-party board, you may be out of luck. If this is your > own board, you might want to select different resistor ratios. > Something like 20/10 and 150/22 should work better, for example. FWIW, chip vendors usually recommend aiming at 3/4 of the scale for the nominal value, which is a good balance between resolution and range. -- Jean Delvare _______________________________________________ lm-sensors mailing list lm-sensors@xxxxxxxxxxxxxx http://lists.lm-sensors.org/mailman/listinfo/lm-sensors
