ATMEGA128A-MU Atmel, ATMEGA128A-MU Datasheet - Page 244
ATMEGA128A-MU
Manufacturer Part Number
ATMEGA128A-MU
Description
MCU 8BIT 128K ISP FLASH 64-QFN
Manufacturer
Atmel
Series
AVR® ATmegar
Specifications of ATMEGA128A-MU
Core Processor
AVR
Core Size
8-Bit
Speed
16MHz
Connectivity
EBI/EMI, I²C, SPI, UART/USART
Peripherals
Brown-out Detect/Reset, POR, PWM, WDT
Number Of I /o
53
Program Memory Size
128KB (64K x 16)
Program Memory Type
FLASH
Eeprom Size
4K 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
64-MLF®, 64-QFN
Processor Series
ATMEGA128x
Core
AVR8
3rd Party Development Tools
EWAVR, EWAVR-BL
Development Tools By Supplier
ATAVRDRAGON, ATSTK500, ATSTK600, ATAVRISP2, ATAVRONEKIT
Controller Family/series
AVR MEGA
No. Of I/o's
53
Eeprom Memory Size
4KB
Ram Memory Size
4KB
Cpu Speed
16MHz
Rohs Compliant
Yes
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
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Price
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Manufacturer:
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8151H–AVR–02/11
where V
Table 23-3 on page 245
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 23-12. Differential Measurement Range
Figure 23-12
- V
REF
IN
POS
/GAIN
is the voltage on the selected input pin and V
shows the resulting output codes if the differential input channel pair (ADCn - ADCm)
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
(
----------------------------------------------------------------------- -
0x3FF
V
ADC
REF
POS
0x1FF
0x000
the selected voltage reference. The result is presented
–
0
=
V
0x200
NEG
V
--------------------------
V
IN
REF
V
) GAIN 512
⋅
REF
⋅
1024
246). 0x000 represents ground, and 0x3FF
NEG
REF
⋅
the voltage on the negative input pin,
REF
the selected voltage reference (see
.
ATmega128A
V
REF
/GAIN Differential Input
Voltage (Volts)
244
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