ATmega64C1 Automotive Atmel Corporation, ATmega64C1 Automotive Datasheet - Page 260

• 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

19.2.2
19.2.3
260
Atmel ATmega16/32/64/M1/C1
Current Source for Low Cost Traducer
Voltage Reference for External Devices
Table 19-2.
Note:
An external transducer based on variable resistor can be connected to the Current Source.
This ca be for instance:
Using the Current Source with this type of transducer eliminates the need for additional parts
otherwise required in resistor network or Wheatstone bridge.
An external resistor used in conjunction with the Current Source can be used as voltage refer-
ence for external devices. Using a resistor in serie with a lower tolerance than the Current
Source accuracy ( 2%) is recommended.
using standard values of resistors.
Physical
Address
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
• A thermistor, or temperature-sensitive resistor, used as a temperature sensor
• A CdS photoconductive cell, or luminosity-sensitivity resistor, used as a luminosity sensor.
1. 5V range: Max R
3V range: Max R
1 000
1 200
1500
1800
2200
2700
3300
4700
6 800
8 200
10 000
12 000
15 000
18 000
22 000
27 000
Resistor Value
Example of Resistor Values(±1%) for a 16-address System (AV
R
load
(Ohm)
load
load
30K
15K
0.1
0.12
0.15
0.18
0.22
0.27
0.33
0.47
0.68
0.82
1.0
1.2
1.5
1.8
2.2
2.7
Voltage (V)
Measured
Typical
Table 19-2
38
46
57
69
84
104
127
181
262
316
386
463
579
694
849
1023
Reading with
a 2.56V ref
Minimum
gives an example of voltage references
40
48
60
72
88
108
132
188
272
328
400
480
600
720
880
1023
Reading with
a 2.56V ref
Typical
CC
45
54
68
81
99
122
149
212
306
369
450
540
675
810
989
1023
Reading with
7647G–AVR–09/11
a 2.56V ref
= 5V
Miximum
(1)
)