ATmega32C1 Automotive Atmel Corporation, ATmega32C1 Automotive Datasheet - Page 241

• Manufacturer Part Number: ATmega32C1 Automotive
• Manufacturer: Atmel Corporation

Specifications of ATmega32C1 Automotive

• Flash (kbytes): 32 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): 2
• Eeprom (bytes): 1024
• 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

18.7
7647G–AVR–09/11
ADC Conversion Result
After the conversion is complete (ADIF is high), the conversion result can be found in the ADC
Result Registers (ADCL, ADCH).
For single ended conversion, the result is:
where V
Table 18-4 on page 245
0x3FF represents the selected reference voltage.
If differential channels are used, the result is:
where V
GAIN the selected gain factor and V
in two’s complement form, from 0x200 (-512d) through 0x1FF (+511d). Note that if the user
wants to perform a quick polarity check of the result, it is sufficient to read the MSB of the
result (ADC9 in ADCH). If the bit is one, the result is negative, and if this bit is zero, the result
is positive.
Table 82 shows the resulting output codes if the differential input channel pair (ADCn - ADCm)
is selected with a reference voltage of V
Figure 18-13. Differential Measurement Range
ADC
ADC
=
=
- V
IN
POS
V
---------------------------- -
----------------------------------------------------------------------------- -
REF
V
IN
is the voltage on the selected input pin and V
/Gain
POS
Figure 18-13
V
is the voltage on the positive input pin, V
REF
1023
–
V
NEG
V
REF
shows the decoding of the differential input range.
and
GAIN
Table 18-5 on page
Output Code
0x3FF
512
REF
0x1FF
0x000
0x200
Atmel ATmega16/32/64/M1/C1
the selected voltage reference. The result is presented
REF
0
.
246). 0x000 represents analog ground, and
NEG
REF
the voltage on the negative input pin,
the selected voltage reference (see
V
REF
/Gain
Differential Input
Voltage (Volts)
241