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ATXMEGAA3BU-XPLD

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P19
Atmel AVR1923
13
8394B-AVR-02/12
Temp.
[°C]
NTC
resistance
[kΩ]
Temp.
[°C]
NTC
resistance
[kΩ]
Temp.
[°C]
NTC
resistance
[kΩ]
Temp.
[°C]
NTC
resistance
[kΩ]
-7 528.602 23 109.970 53 29.366 83 9.510
-6 499.212 24 104.852 54 28.203 84 9.185
-5 471.632 25 100.000 55 27.091 85 8.873
-4 445.772 26 95.398 56 26.028 86 8.572
-3 421.480 27 91.032 57 25.013 87 8.283
-2 398.652 28 86.889 58 24.042 88 8.006
-1 377.193 29 82.956 59 23.113 89 7.738
Two common approximations can be used to model the temperature vs. resistance
characteristic; these are the B parameter and the Steinhart-Hart equations.
Coefficients for both formulas can be calculated from Table 5-8.
Whe
n the internal reference VCC/1.6 is used and the ADC is measuring in signed
single ended mode the codes in Table 5-9
can be read from the ADC at the various
temperatures. The calculation is based on Table 5-8.
Table 5-9. ADC
codes vs. temperature (signed single ended mode with internal
VCC/1.6 reference).
ADC input [V] Temp. [°C] ADC codes ADC input [V] Temp. [°C] ADC codes
2.076 -14 2047 0.347 38 345
2.030 -13 2014 0.334 39 332
1.983 -12 1968 0.321 40 319
1.936 -11 1921 0.309 41 307
1.889 -10 1875 0.297 42 295
1.841 -9 1828 0.286 43 283
1.794 -8 1781 0.275 44 273
1.747 -7 1734 0.264 45 262
1.700 -6 1687 0.254 46 252
1.653 -5 1640 0.244 47 243
1.606 -4 1594 0.235 48 233
1.560 -3 1548 0.226 49 225
1.514 -2 1503 0.218 50 216
1.469 -1 1458 0.209 51 208
1.425 0 1414 0.202 52 200
1.380 1 1370 0.194 53 193
1.337 2 1327 0.187 54 185
1.294 3 1285 0.180 55 178
1.252 4 1243 0.173 56 172
1.211 5 1202 0.167 57 165
1.171 6 1162 0.161 58 159
1.131 7 1123 0.155 59 154
1.093 8 1084 0.149 60 148
14
Atmel AVR1923
8394B-AVR-02/12
ADC input [V] Temp. [°C] ADC codes ADC input [V] Temp. [°C] ADC codes
1.055 9 1047 0.144 61 142
1.018 10 1010 0.138 62 137
0.982 11 975 0.133 63 132
0.947 12 940 0.128 64 127
0.913 13 907 0.124 65 123
0.880 14 874 0.119 66 118
0.848 15 842 0.115 67 114
0.817 16 811 0.111 68 110
0.787 17 781 0.107 69 106
0.758 18 752 0.103 70 102
0.730 19 724 0.100 71 99
0.702 20 697 0.096 72 95
0.676 21 671 0.093 73 92
0.650 22 645 0.090 74 89
0.626 23 621 0.086 75 86
0.602 24 597 0.083 76 83
0.579 25 575 0.081 77 80
0.557 26 553 0.078 78 77
0.535 27 531 0.075 79 75
0.515 28 511 0.073 80 72
0.495 29 491 0.070 81 70
0.476 30 472 0.068 82 67
0.458 31 454 0.065 83 65
0.440 32 437 0.063 84 63
0.423 33 420 0.061 85 61
0.407 34 404 0.059 86 59
0.391 35 388 0.057 87 57
0.376 36 373 0.055 88 55
0.361 37 359 0.053 89 53
5.7.2 Ambient light sensor
The ambient light sensor TEMT6000X01 from Vishay Semiconductors is sensitive to
visible light much like the human eye. The measurement circuitry is configured to
measure the illuminance from ~10 to ~900lx when the internal VCC/1.6 reference is
used.
The data in Table 5-10 whi
ch shows the relationship between illuminance and output
voltage of the sensor circuitry is generated based on the symbols and formulas in
Table 5-9.
Atmel AVR1923
15
8394B-AVR-02/12
Table 5-10. Symbol description for illuminance calculation.
Symbols Description
ICA
Calibrated sensor responsivity at 100lx. This is 50µA according
to the sensor datasheet
E
v
Illuminance
I Current through the sensor
U Output voltage of the sensor circuitry that is provided to the ADC
R
Series resistor of the sensor circuitry. 4.7kΩ has been chosen in
this design
E
v
= 100 x I / ICA
Illuminance is calculated based on the relation of the actual
current through the sensor to the calibrated value at 100lx
I = U / R
Since the ADC measures the voltage across the series resistor
of the sensor circuitry it is necessary to calculate the voltage
based on the current
U = (E
v
x R x ICA) / 100
Based on the current and the illuminance the output voltage of
the sensor circuitry can be calculated
Table 5-11. Illuminance vs. ADC input voltage.
Illuminance [lux] ADC input [V] Illuminance
1 0.0024 Dusk
10 0.0235 Dusk
20 0.0470 Dusk
30 0.0705 Dusk
40 0.0940 Dusk
50 0.1175 Living room
60 0.1410 Living room
70 0.1645 Living room
80 0.1880 Living room
90 0.2115 Living room
100 0.2350 Living room
200 0.4700 Office lighting
300 0.7050 Office lighting
400 0.9400 Office lighting
500 1.1750 Office lighting
600 1.4100 Office lighting
700 1.6450 Office lighting
800 1.8800 Office lighting
900 2.1150 Office lighting
1000 2.3500 Overcast day
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ATXMEGAA3BU-XPLD

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Development Boards & Kits - AVR XMEGAA3BU XPLAINED EVAL KIT
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