ATDVK90CAN1 Atmel, ATDVK90CAN1 Datasheet - Page 30

• 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

3.7.6
DVK90CAN1 Hardware User Guide
Voltage Reading
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
Note:
The voltage reading is made with a bridge of
voltage witch is to measure (100 KΩ / (220+180) KΩ + 100 KΩ). 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 KΩ).
Figure 3-35 . Voltage Reading Schematic
The voltage over this resistor (100 KΩ) can be found using the A/D converter. See the
AT90CAN128 Datasheet for how to use the ADC. The input voltage value (V
calculate with the following expression:
Where:
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.
V
IN
=
V
V
5 V
IN
ADC2
⋅
= Input voltage value (V)
ADC2
= Voltage value on ADC-2 input (V)
±
1% resistors. The read value is 1/5 of the
ADC-4
ADC-2
ADC-0
AIN-0
GND
ANA CON
(top view)
1 2
3 4
5 6
7 8
9 10
Using the DVK90CAN1
ADC-5
ADC-3
ADC-1
AIN-1
VCC
4381B–AVR–07/08
IN
3-29
) is