ATMEGA1284P-MUR Atmel, ATMEGA1284P-MUR Datasheet - Page 251
ATMEGA1284P-MUR
Manufacturer Part Number
ATMEGA1284P-MUR
Description
MCU AVR 128KB FLASH 20MHZ 44VQFN
Manufacturer
Atmel
Series
AVR® ATmegar
Specifications of ATMEGA1284P-MUR
Core Processor
AVR
Core Size
8-Bit
Speed
20MHz
Connectivity
I²C, SPI, UART/USART
Peripherals
Brown-out Detect/Reset, POR, PWM, WDT
Number Of I /o
32
Program Memory Size
128KB (64K x 16)
Program Memory Type
FLASH
Eeprom Size
4K x 8
Ram Size
16K x 8
Voltage - Supply (vcc/vdd)
1.8 V ~ 5.5 V
Data Converters
A/D 8x10b
Oscillator Type
Internal
Operating Temperature
-40°C ~ 85°C
Package / Case
44-VQFN Exposed Pad
For Use With
ATSTK600 - DEV KIT FOR AVR/AVR32
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
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22.7.2
22.7.3
8272A–AVR–01/10
Analog Noise Canceling Techniques
Offset Compensation Schemes
Digital circuitry inside and outside the device generates EMI which might affect the accuracy of
analog measurements. If conversion accuracy is critical, the noise level can be reduced by
applying the following techniques:
Figure 22-9. ADC Power Connections
The gain stage has a built-in offset cancellation circuitry that nulls the offset of differential mea-
surements as much as possible. The remaining offset in the analog path can be measured
directly by selecting the same channel for both differential inputs. This offset residue can be then
subtracted in software from the measurement results. Using this kind of software based offset
correction, offset on any channel can be reduced below one LSB.
164A/164PA/324A/324PA/644A/644PA/1284/1284P
a. Keep analog signal paths as short as possible. Make sure analog tracks run over the
b. The AVCC pin on the device should be connected to the digital V
c. Use the ADC noise canceler function to reduce induced noise from the CPU.
d. If any ADC port pins are used as digital outputs, it is essential that these do not
analog ground plane, and keep them well away from high-speed switching digital
tracks.
via an LC network as shown in
switch while a conversion is in progress.
Figure
22-9.
PA4 (ADC4)
PA5 (ADC5)
PA6 (ADC6)
PA7 (ADC7)
AREF
GND
AVCC
PC7
CC
supply voltage
251
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