ATMEGA64A-MN Atmel, ATMEGA64A-MN Datasheet - Page 246
ATMEGA64A-MN
Manufacturer Part Number
ATMEGA64A-MN
Description
IC MCU AVR 64K FLASH 8QFN
Manufacturer
Atmel
Series
AVR® ATmegar
Datasheet
1.ATMEGA64A-AU.pdf
(392 pages)
Specifications of ATMEGA64A-MN
Core Processor
AVR
Core Size
8-Bit
Speed
16MHz
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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8160C–AVR–07/09
where V
Table 23-3 on page 247
represents 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 23-2
is selected with a gain of GAIN and a reference voltage of V
Figure 23-14. Differential Measurement Range
Figure 23-14
- V
IN
POS
REF
is the voltage on the selected input pin and V
shows the resulting output codes if the differential input channel pair (ADCn - ADCm)
/GAIN
is the voltage on the positive input pin, V
shows the decoding of the differential input range.
and
ADC
Table 23-4 on page
=
(
----------------------------------------------------------------------- -
Output Code
V
0x3FF
REF
POS
0x1FF
0x000
the selected voltage reference. The result is presented
–
0
V
0x200
NEG
V
REF
) GAIN 512
⋅
248). 0x000 represents ground, and 0x3FF
NEG
REF
⋅
the voltage on the negative input pin,
REF
the selected voltage reference (see
.
V
REF
ATmega64A
/GAIN Differential Input
Voltage (Volts)
246
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