参数资料
| 型号： | ATDVK90CAN1 |
| 厂商： | Atmel |
| 文件页数： | 31/61页 |
| 文件大小： | 0K |
| 描述： | KIT DEV FOR AT90CAN128 MCU |
| 产品培训模块： | MCU Product Line Introduction |
| 标准包装： | 1 |
| 主要目的： | 接口，CAN |
| 嵌入式： | 是，MCU，8 位 |
| 已用 IC / 零件： | AT90CAN AVR 设备 |
| 已供物品： | 板，线缆，文档，软件 |
| 产品目录页面： | 612 (CN2011-ZH PDF) |
| 相关产品： | AT90CAN128-16AUR-ND - IC MCU AVR 128K FLASH 64TQFP AT90CAN128-16MUR-ND - IC MCU AVR 128K FLASH 64QFN AT90CAN64-15MZTR-ND - MCU AVR 64K FLASH 15MHZ 64-QFN AT90CAN64-15MT1TR-ND - MCU AVR 64K FLASH 15MHZ 64-QFN AT90CAN64-15MTTR-ND - MCU AVR 64K FLASH 15MHZ 64-QFN AT90CAN64-15AZTR-ND - MCU AVR 64K FLASH 15MHZ 64TQFP AT90CAN64-15AT1TR-ND - MCU AVR 64K FLASH 15MHZ 64TQFP AT90CAN64-15ATTR-ND - MCU AVR 64K FLASH 15MHZ 64TQFP AT90CAN32-16AUR-ND - MCU AVR 32K FLASH 16MHZ 64-TQFP AT90CAN32-15MZTR-ND - MCU AVR 32K FLASH 15MHZ 64-QFN 更多... |
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Using the DVK90CAN1
The voltage input can be configured. It can be either the board supply voltage (VCC) or
an external input on T11 test pin. To improve the connection, close to T11, there is the
test pin T12 wrapped to GND.
Table 3-14 . Voltage Input Switch Configuration
Mode
View
Mode
View
External
VCC
Input
(T11)
T11 = VIN
T12 = GND
3.7.7
Temperature Sensor
The temperature sensor uses a thermistor, 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. See the AT90CAN128
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 )
Where:
R T = Thermistor value ( Ω ) at T temperature (°Kelvin)
? ln ------- + ------
R 0 ?
?
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
The NTC thermistor used in DVK90CAN1 has a resistance of 100 K Ω ± 5% at 25°C (T 0 )
and a beta-value of 4250 ±3%. By the use of the following equation, the temperature (T)
can be calculated:
β
T = -------------------------------
R T ? β
T 0
Where:
R T = Thermistor value ( Ω ) at T temperature (°Kelvin)
? = 4250 ±3%
R 0 = 100 K Ω ± 5% at 25°C
T 0 = 298 °K (273 °K + 25°K)
The following cross table also can be used. It is based on the above equation.
3-30
4381B–AVR–07/08
DVK90CAN1 Hardware User Guide
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