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Using the AT90USBKey
2.4.3
LEDs
The AT90USBKey includes 2 bi-color LEDs (green/red) implemented on one line. They
are connected to the high nibble of “Port D” of AT90USB (PORTD[4..7]).
To light on a LED, the corresponding port pin must drive a high level. To light off a LED,
the corresponding port pin must drive a low level.
Figure 2-7 . LEDs Implementation schematic
LEDs
In-line Grouped LEDs
D2
1k
R14
PD4
PD[7..0]
1k
R17
PD5
D5
1k
1k
R22
R23
PD6
PD7
Table 2-1 . Leds references
2.4.4
Temperature Sensor
LED Reference
D2
D5
AT90USB Connection
PORTD.4
PORTD.5
PORTD.6
PORTD.7
Color
Red
Green
Green
Red
The temperature sensor uses a thermistor (R29), or temperature-sensitive resistor. This
thermistor have a negative temperature coefficient (NTC), meaning the resistance goes
up as temperature goes down. Of all passive temperature measurement sensors,
thermistors have the highest sensitivity (resistance change per degree of temperature
change). Thermistors do not have a linear temperature/resistance curve.
The voltage over the NTC can be found using the A/D converter (connected to channel
0). See the AT90USB Datasheet for how to use the ADC. The thermistor value (R T ) is
calculate with the following expression:
R T = ( R H ? V ADC 0 ) ? ( V CC V ADC 0 )
2-10
7627A–AVR–04/06
Where:
R T = Thermistor value ( Ω ) at T temperature (°Kelvin)
R H = Second resistor of the bridge -100 K Ω ± 10% at 25°C
V ADC0 = Voltage value on ADC-0 input (V)
V CC = Board power supply
AT90USBKey Hardware User Guide
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