ATmega32U4 Atmel Corporation, ATmega32U4 Datasheet - Page 302
ATmega32U4
Manufacturer Part Number
ATmega32U4
Description
Manufacturer
Atmel Corporation
Specifications of ATmega32U4
Flash (kbytes)
32 Kbytes
Pin Count
44
Max. Operating Frequency
16 MHz
Cpu
8-bit AVR
# Of Touch Channels
14
Hardware Qtouch Acquisition
No
Max I/o Pins
26
Ext Interrupts
13
Usb Transceiver
1
Usb Speed
Full Speed
Usb Interface
Device
Spi
2
Twi (i2c)
1
Uart
1
Graphic Lcd
No
Video Decoder
No
Camera Interface
No
Adc Channels
12
Adc Resolution (bits)
10
Adc Speed (ksps)
15
Analog Comparators
1
Resistive Touch Screen
No
Temp. Sensor
Yes
Crypto Engine
No
Sram (kbytes)
3.3
Eeprom (bytes)
1024
Self Program Memory
YES
Dram Memory
No
Nand Interface
No
Picopower
No
Temp. Range (deg C)
-40 to 85
I/o Supply Class
2.7 to 5.5
Operating Voltage (vcc)
2.7 to 5.5
Fpu
No
Mpu / Mmu
no / no
Timers
4
Output Compare Channels
12
Input Capture Channels
2
Pwm Channels
8
32khz Rtc
No
Calibrated Rc Oscillator
Yes
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24.7.2
7766F–AVR–11/10
Analog Noise Canceling Techniques
Figure 24-9. 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 24-10. ADC Power Connections
Note:
a. Keep analog signal paths as short as possible. Make sure analog tracks run over
b. The AV
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
The same circuitry should be used for AVCC filtering on the ADC8-ADC13 side
the analog ground plane, and keep them well away from high-speed switching digi-
tal tracks.
via an LC network as shown in
switch while a conversion is in progress.
CC
pin on the device should be connected to the digital V
ADCn
Analog Ground Plane
100nF
I
IH
Figure
I
IL
(ADC7) PF7
(ADC6) PF6
(ADC5) PF5
(ADC4) PF4
(ADC1) PF1
(ADC0) PF0
24-10.
AVCC
AREF
GND
GND
VCC
1..100 kΩ
34
35
36
37
38
39
40
41
42
43
44
1
ATmega16/32U4
C
S/H
= 14 pF
V
CC
CC
/2
supply voltage
302
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