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AX2550 Motor Controller User’s Manual 69
Temperature Conversion C Source Code
Temperature Conversion C Source Code
The code below can be used to convert the analog reading into temperature. It is provided
for reference only. Interpolation table is for the internal thermistors.
int ValToHSTemp(int AnaValue)
{
// Interpolation table. Analog readings at -40 to 150 oC, in 5o intervals
int TempTable[39] ={248, 246, 243, 240, 235, 230, 224, 217, 208, 199, 188, 177,
165, 153, 140, 128, 116, 104,93, 83, 74, 65, 58, 51, 45, 40, 35, 31, 27, 24, 21,
19, 17, 15, 13, 12, 11, 9, 8};
int LoTemp, HiTemp, lobound, hibound, temp, i;
i=38;
while (TempTable[i] < AnaValue &&i>0)
i--;
if (i < 0)
i=0;
if (i == 38)
return 150;
else
{
LoTemp =i*5-40;
HiTemp = LoTemp + 5;
lobound = TempTable[i];
hibound = TempTable[i+1];
temp = LoTemp + (5 * ((AnaValue - lobound)*100/ (hibound - lobound)))/100;
return temp;
}
}
0
50
100
150
200
250
300
Reported Analog Value
Temperature in Degrees C
-40
-30
-20
-10
0
10
20
30
40
50
60
70
80
90
100
110
120
130
140
150
FIGURE 39. Analog reading by controller vs. internal heat sink temperature