ATDVK90CAN1 Atmel, ATDVK90CAN1 Datasheet - Page 32

• Manufacturer Part Number: ATDVK90CAN1
• Description: KIT DEV FOR AT90CAN128 MCU
• Manufacturer: Atmel

Specifications of ATDVK90CAN1

• Main Purpose: *
• Embedded: *
• Utilized Ic / Part: AT90CAN AVR Devices
• Primary Attributes: *
• Secondary Attributes: *
• Processor To Be Evaluated: AT90CAN
• Data Bus Width: 8 bit
• Interface Type: RS-232, SPI, TWI
• Core Architecture: AVR
• Core Sub-architecture: AVR UC3
• Kit Contents: Board, AT90CAN128 Sample Microcontroller, 9V Battery Power Cable, CD-ROM, Manuals
• Features: RS232, CAN, LIN, SPI & TWI Serial Interface
• Rohs Compliant: Yes
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

4381A–AVR–Sept 04
Using the DVK90CAN1
3.7.8
page 30
Luminosity Sensor
Figure 3-36 . Thermistor Schematic
Figure 3-37 . Thermistor Implementation
The luminosity sensor uses a CdS photoconductive cell, or luminosity-sensitive resistor.
The luminosity-sensitive resistor have a negative coefficient, meaning the resistance
goes up as luminosity goes down. This luminosity sensor have a linear
resistance/temperature curve from 0 up to 75°C.
The luminosity sensor used in DVK90CAN1 has a resistance close to 60 K
and 5 K at 100 lux for a wavelength of 550 nm.
Table 3-16 . CdS Photoconductive Cell Electrical characteristics at temp=25°C
The voltage over the luminosity sensor can be found using the A/D converter. See the
AT90CAN128 Datasheet for how to use the ADC. The resistor value (R
Peak Spectral Wavelength
Parameter (
Light Resistance
Dark Resistance
temp=25°C
)
Min
20
20
550
Typ Max Units
5
100
K
K
K
nm
R31 = Thermistor
DVK90CAN1 Hardware User Guide
10 s after removal of light
10 s after removal of light
Test Conditions
100 lux
10 lux
L
) is calculate
at 10 lux