ATMEGA64M1-AU Atmel, ATMEGA64M1-AU Datasheet - Page 231

• Manufacturer Part Number: ATMEGA64M1-AU
• Description: IC MCU AVR 64K FLASH 32TQFP
• Manufacturer: Atmel
• Series: AVR® ATmegar

Specifications of ATMEGA64M1-AU

• Core Processor: AVR
• Core Size: 8-Bit
• Speed: 16MHz
• Connectivity: CAN, LIN, SPI, UART/USART
• Peripherals: Brown-out Detect/Reset, POR, PWM, Temp Sensor, WDT
• 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 11x10b; D/A 1x10b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 32-TQFP, 32-VQFP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Number Of I /o: -
• Lead Free Status / Rohs Status: Details

21.6.2
8209D–AVR–11/10
Analog Noise Canceling Techniques
to remove high frequency components with a low-pass filter before applying the signals as
inputs to the ADC.
Figure 21-8. 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:
Figure 21-9. ADC Power Connections
1. Keep analog signal paths as short as possible. Make sure analog tracks run over the
2. The AV
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
(ACMPN3/ADC0) PE2
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
CC
(ADC1) PD4
pin on the device should be connected to the digital V
GND
VCC
ADCn
Figure 21-9
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
I
IH
I
IL
32
31
30
29
28
27
26
25
24
23
22
21
20
19
18
17
ATmega16M1/32M1/64M1
1..100 kΩ
PB7(ADC4)
PB6 (ADC7)
PB5 (ADC6/ACMPN1/AMP2-)
PC7 (D2A/AMP2+)
PB4 (AMP0+)
PB3 (AMP0-)
PC6 (ADC10/ACMP1)
AREF (ISRC)
AGND
AVCC
PC5 (ADC9/ACMP3/AMP1+)
PC4 (ADC8/AMP1-)
PB2 (ADC5/ACMPN0)
PD7 (ACMP0)
PD6 (ADC3/ACMPN2)
PD5 (ADC2/ACMP2)
Analog Ground Plane
C
S/H
= 14 pF
CC
V
CC
supply voltage via an
/2
100nF
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