ATMEGA649P-AU Atmel, ATMEGA649P-AU Datasheet - Page 227
![IC MCU AVR 64K FLASH 64TQFP](/photos/12/13/121332/313-64-tqfp_sml.jpg)
ATMEGA649P-AU
Manufacturer Part Number
ATMEGA649P-AU
Description
IC MCU AVR 64K FLASH 64TQFP
Manufacturer
Atmel
Series
AVR® ATmegar
Specifications of ATMEGA649P-AU
Core Processor
AVR
Core Size
8-Bit
Speed
16MHz
Connectivity
SPI, UART/USART, USI
Peripherals
Brown-out Detect/Reset, LCD, POR, PWM, WDT
Number Of I /o
54
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)
1.8 V ~ 5.5 V
Data Converters
A/D 8x10b
Oscillator Type
Internal
Operating Temperature
-40°C ~ 85°C
Package / Case
64-TQFP
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Part Number:
ATMEGA649P-AU
Manufacturer:
AT
Quantity:
20 000
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22.7.2
8284A–AVR–10/10
Analog Noise Canceling Techniques
Figure 22-8. Analog Input Circuitry
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:
1. Keep analog signal paths as short as possible. Make sure analog tracks run over the
2. The AVCC pin on the device should be connected to the digital V
3. Use the ADC noise canceler function to reduce induced noise from the CPU.
4. If any ADC port pins are used as digital outputs, it is essential that these do not switch
Figure 22-9. ADC Power Connections
ATmega169A/169PA/329A/329PA/649A/649P/3290A/3290PA/6490A/6490P
analog ground plane, and keep them well away from high-speed switching digital tracks.
LC network as shown in
while a conversion is in progress.
ADCn
Analog Ground Plane
Figure 22-9 on page
I
IH
I
100nF
IL
(ADC7) PF7
(ADC6) PF6
(ADC5) PF5
(ADC4) PF4
(ADC3) PF3
(ADC2) PF2
(ADC1) PF1
(ADC0) PF0
AVCC
AREF
GND
GND
VCC
PA0
1..100 kΩ
227.
51
52
53
54
55
56
57
58
59
60
61
61
62
62
63
63
64
64
1
C
S/H
CC
= 14 pF
supply voltage via an
V
CC
/2
227
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