Thermistors: Selecting miscellaneous parameters
| In January 2012 we introduced the Thermistor hash command, which makes the use of spreadsheets largely unnecessary. This page will still help you pick and set the parameters. |
The next thing to do is to enter the various parameters that define your SPLat board. These are the green cells in the spreadsheet labeled “ADCSpan”, “ADCInputR”, “Intnl Feed Res” and “Ext Shunt Res”.
The following table gives values for various SPLat products.
| MMiXXX SL99 | SPice 10200 | AJ18 | OEM36 | |
|---|---|---|---|---|
| ADCSpan | 5 | 5 | 5 | 10 |
| ADCinputR | 9e99 | 9e99 | 9e99 | 9000 |
| Intnl Feed Res | 0 | 0 | 0 | See note |
| Ext Shunt Res | 9e99 | 9e99 | 9e99 | 9e99 |
Note on Intnl Feed Res and OEM36: If you use an analog output to generate Vfeed, then set this to 220 to represent the analog output resistance of the board. Otherwise set it to 0.
The Ext Shunt Res is a parameter we’ve provided to allow some fine tuning in special cases. Initially setting it to 9e99 (a very large number) is the same as leaving it out.
Once you have set these parameters you can move on to the next section, where we start the optimization.