ATMEGA8535L-8AC Atmel, ATMEGA8535L-8AC Datasheet - Page 218

• Manufacturer Part Number: ATMEGA8535L-8AC
• Description: IC AVR MCU 8K LV 8MHZ COM 44TQFP
• Manufacturer: Atmel
• Series: AVR® ATmegar

Specifications of ATMEGA8535L-8AC

• Core Processor: AVR
• Core Size: 8-Bit
• Speed: 8MHz
• Connectivity: I²C, SPI, UART/USART
• Peripherals: Brown-out Detect/Reset, POR, PWM, WDT
• Number Of I /o: 32
• Program Memory Size: 8KB (4K x 16)
• Program Memory Type: FLASH
• Eeprom Size: 512 x 8
• Ram Size: 512 x 8
• Voltage - Supply (vcc/vdd): 2.7 V ~ 5.5 V
• Data Converters: A/D 8x10b
• Oscillator Type: Internal
• Operating Temperature: 0°C ~ 70°C
• Package / Case: 44-TQFP, 44-VQFP
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

ADC Conversion Result
218
ATmega8535(L)
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
ence (see Table 84 on page 219 and Table 85 on page 220). 0x000 represents analog
ground, and 0x3FF represents the selected reference voltage minus one LSB.
If differential channels are used, the result is
where V
input pin, GAIN the selected gain factor, and V
result is presented 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 results, it is
sufficient to read the MSB of the result (ADC9 in ADCH). If the bit is one, the result is
negative, and if the bit is zero, the result is positive. Figure 111 shows the decoding of
the differential input range.
Table 83 shows the resulting output codes if the differential input channel pair (ADCn -
ADCm) is selected with a gain of GAIN and a reference voltage of V
Figure 111. Differential Measurement Range
- V
REF
/GAIN
IN
POS
is the voltage on the selected input pin and V
is the voltage on the positive input pin, V
ADC
=
(
----------------------------------------------------------------------- -
Output Code
V
0x3FF
POS
0x1FF
0x000
ADC
–
0
V
0x200
NEG
=
V
REF
V
--------------------------
) GAIN 512
IN
⋅
V
⋅
REF
REF
1024
the selected voltage reference. The
⋅
NEG
REF
the voltage on the negative
the selected voltage refer-
V
REF
REF
/GAIN Differential Input
.
Voltage (Volts)
2502K–AVR–10/06