参数资料
型号: ATDVK90CAN1
厂商: Atmel
文件页数: 30/61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
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Using the DVK90CAN1
AIN-0, or PortE.2, can be already used as logic input if “CENTER” switch is not in its
default configuration (c.f. Section "Interrupt 0 / 2", page 25).
Figure 3-34 . Analog I/O Connector Implementation
ADC-4
ADC-2
ADC-0
AIN-0
GND
1
3
5
7
9
2
4
6
8
10
ADC-5
ADC-3
ADC-1
AIN-1
VCC
ANA CON
(top view)
Note:
ADC-4 & ADC-5 take share with the JTAG connections. If these analog inputs
are used through the Analog I/O Connector, be sure that the JTAGEN fuse is
unprogrammed.
3.7.6
Voltage Reading
The voltage reading is made with a bridge of ± 1% resistors. The read value is 1/5 of the
voltage witch is to measure (100 K Ω / (220+180) K Ω + 100 K Ω ). The high values of
resistors protect the micro controller input. If necessary, the read value can be limited to
2.4V by a zener diode. This will give a voltage reading range from 0 to 12.0V with
internal VRef (the zener diode can have a impedance close to 80 K Ω ).
Figure 3-35 . Voltage Reading Schematic
The voltage over this resistor (100 K Ω ) can be found using the A/D converter. See the
AT90CAN128 Datasheet for how to use the ADC. The input voltage value (V IN ) is
calculate with the following expression:
V IN = 5 ? V ADC 2
DVK90CAN1 Hardware User Guide
Where:
V IN = Input voltage value (V)
V ADC2 = Voltage value on ADC-2 input (V)
3-29
4381B–AVR–07/08
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