ATMEGA64L-8MQR Atmel, ATMEGA64L-8MQR Datasheet - Page 242
ATMEGA64L-8MQR
Manufacturer Part Number
ATMEGA64L-8MQR
Description
MCU AVR 64KB FLASH 8MHZ 64QFN
Manufacturer
Atmel
Series
AVR® ATmegar
Specifications of ATMEGA64L-8MQR
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
53
Program Memory Size
64KB (32K x 16)
Program Memory Type
FLASH
Eeprom Size
2K x 8
Ram Size
4K x 8
Voltage - Supply (vcc/vdd)
2.7 V ~ 5.5 V
Data Converters
A/D 8x10b
Oscillator Type
Internal
Operating Temperature
-40°C ~ 85°C
Package / Case
*
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
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ADC Conversion
Result
2490Q–AVR–06/10
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 97 on page 243
sents the selected reference voltage minus one LSB.
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 results, it is sufficient to read the MSB of the result
(ADC9 in ADCH). If this bit is one, the result is negative, and if this bit is zero, the result is posi-
tive.
Table 96
selected with a gain of GAIN and a reference voltage of V
Figure 121. Differential Measurement Range
Figure 121
- V
IN
POS
shows the resulting output codes if the differential input channel pair (ADCn - ADCm) is
REF
is the voltage on the selected input pin and V
/GAIN
is the voltage on the positive input pin, V
shows the decoding of the differential input range.
and
ADC
Table 98 on page
=
(
----------------------------------------------------------------------- -
Output Code
V
0x3FF
REF
POS
0x1FF
0x000
ADC
the selected voltage reference. The result is presented
–
0
V
0x200
NEG
=
244). 0x000 represents ground, and 0x3FF repre-
V
V
--------------------------
REF
) GAIN 512
IN
V
⋅
⋅
REF
1024
NEG
REF
⋅
REF
the voltage on the negative input pin,
the selected voltage reference (see
.
V
ATmega64(L)
REF
/GAIN Differential Input
Voltage (Volts)
242
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