ATmega64C1 Automotive Atmel Corporation, ATmega64C1 Automotive Datasheet - Page 259

• Manufacturer Part Number: ATmega64C1 Automotive
• Manufacturer: Atmel Corporation

Specifications of ATmega64C1 Automotive

• Flash (kbytes): 64 Kbytes
• Pin Count: 32
• Max. Operating Frequency: 16 MHz
• Cpu: 8-bit AVR
• # Of Touch Channels: 12
• Hardware Qtouch Acquisition: No
• Max I/o Pins: 27
• Ext Interrupts: 27
• Usb Speed: No
• Usb Interface: No
• Spi: 1
• Uart: 1
• Can: 1
• Lin: 1
• Graphic Lcd: No
• Video Decoder: No
• Camera Interface: No
• Adc Channels: 11
• Adc Resolution (bits): 10
• Adc Speed (ksps): 125
• Analog Comparators: 4
• Resistive Touch Screen: No
• Dac Channels: 1
• Dac Resolution (bits): 10
• Temp. Sensor: Yes
• Crypto Engine: No
• Sram (kbytes): 4
• Eeprom (bytes): 2048
• Self Program Memory: YES
• Dram Memory: No
• Nand Interface: No
• Picopower: No
• Temp. Range (deg C): -40 to 150
• I/o Supply Class: 2.7 to 5.5
• Operating Voltage (vcc): 2.7 to 5.5
• Fpu: No
• Mpu / Mmu: no / no
• Timers: 2
• Output Compare Channels: 4
• Input Capture Channels: 1
• Pwm Channels: 4
• 32khz Rtc: No
• Calibrated Rc Oscillator: Yes

19.2
19.2.1
7647G–AVR–09/11
Typical applications
LIN Current Source
During the configuration of a LIN node in a cluster, it may be necessary to attribute dynami-
cally an unique physical address to every cluster node. The way to do it is not described in the
LIN protocol.
The Current Source offers an excellent solution to associate a physical address to the applica-
tion supported by the LIN node. A full dynamic node configuration can be used to set-up the
LIN nodes in a cluster.
ATmega16/32/64/M1/C1 proposes to have an external resistor used in conjunction with the
Current Source. The device measures the voltage to the boundaries of the resistance via the
Analog to Digital converter. The resulting voltage defines the physical address that the com-
munication handler will use when the node will participate in LIN communication.
In automotive applications, distributed voltages are very disturbed. The internal Current
Source solution of ATmega16/32/64/M1/C1 immunizes the address detection against any kind
of voltage variations.
Table 19-1.
Physical
Address
0
1
2
3
4
5
6
7
Resistor Value
1 000
2 200
3 300
4 700
6 800
10 000
15 000
22 000
Example of Resistor Values(±5%) for a 8-address System (AV
R
load
(Ohm)
0.1
0.22
0.33
0.47
0.68
1
1.5
2.2
Voltage (V)
Measured
Typical
Atmel ATmega16/32/64/M1/C1
Reading with
a 2.56V ref
Minimum
40
88
132
188
272
400
600
880
Reading with
a 2.56V ref
Typical
CC
Reading with
= 5V
a 2.56V ref
Maximum
(1)
)
259