When consumer electronics devices spring up in recent decades, the demand for Atmega32u4 dramatically increases. This text will explore what it is, how it features, and where it is applied.
The ATmega32U4 is a powerful, user-friendly, and highly integrated micro-controller, which is widely applied in embedded systems requiring USB connectivity and complex communications. The ATMega32U4 is a low-power 8-bit AVR RISC-based micro-controller distinguished by 2.5KB SRAM, 1KB EEPROM, 32KB self-programming flash program memory, 12-channel 10-bit A/D-converter, USB 2.0 full-speed/low-speed device, and JTAG interface for on-chip-debug.
Category | 8-bit AVR Micro-controller | Program Memory Type | Flash |
Program Memory Size | 32KB | CPU Speed (MIPS/DMIPS) | 16 |
SRAM | 2560B | Data EEPROM/HEF | 1024bytes |
Digital Communication Peripherals | 1-UART, 2-SPI, 1-I2C | Capture/Compare/PWM Peripherals | 2 Input Capture, 2 CCP, 12PWM |
Timers | 2 x 8-bit, 2 x 16-bit | Number of Comparators | 1 |
Number of USB Modules | 1, Full Speed | Temperature Range | -40 to 85°C |
Operating Voltage Range | 2.7 to 5.5V | Pin Count | 44 |
Pin No. | Pin Name | Pin No. | Pin Name |
1 | (INT6/AINO)PE6 | 23 | GND1 |
2 | UVcc | 24 | AVCC |
3 | D- | 25 | (ICP1/ADC8)PD4 |
4 | D+ | 26 | (T1/#OC4D/ADC9)PD6 |
5 | UGnd | 27 | (T0/OC4D/ADC10)PD7 |
6 | UCap | 28 | (ADC11/PCINT4)PB4 |
7 | VBus | 29 | (PCINT5/OC1A/#OC4B/ADC12)PB5 |
8 | (SS/PCINT0)PB0 | 30 | (PCINT6/OC1B/OC4B/ADC13)PB6 |
9 | (PCINT1/SCLK)PB1 | 31 | (OC3A/OC4A)PC6 |
10 | (PDI/PCINT2/MOSI)PB2 | 32 | (ICP3/CLK0/OC4A)PC7 |
11 | (PDO/PCINT3/MISO)PB3 | 33 | (#HWB)PE2 |
12 | (PCINT7/OC0A/OC1C/#RTS)PB7 | 34 | Vcc1 |
13 | RESET | 35 | GND2 |
14 | Vcc | 36 | (ADC7/TDI)PF7 |
15 | GND | 37 | (ADC6/TDO)PF6 |
16 | XTAL2 | 38 | (ADC5/TMS)PF5 |
17 | XTAL1 | 39 | (ADC4/TCK)PF4 |
18 | (OCOB/SCL/INT0)PD0 | 40 | (ADC1)PF1 |
19 | (SDA/INT1)PD1 | 41 | (ADC0)PF0 |
20 | (RX D1/AIN1/INT2)PD2 | 42 | AREF |
21 | (TXD1/INT3)PD3 | 43 | GND3 |
22 | (XCK1/#CTS)PD5 | 44 | AVCC1 |
To sum up, there are total 44 versatile pins equipped on it. Two of them can be used as VCC and four of them can be used as GND. Fourteen pins can serve as digital function, including seven pins for PWM. More and more, ATmega32U4 comes with one MOSI pins, one MISO pins and one HWB pins. They allow user’s access and loading program. Further, it can be even used as common GPIO. Last, it has one UART output, four SPI and one I2C pin.
ATmega32u4 is an 8-bit micro-controller, which is mainly applied in low power consumption. It has a 16MHz crystal. Measuring by a multi-meter, the power consumption is at 40mA, which is very suitable for tiny device such as electronics toys and USB controller. What’ more, it is equipped with a USB interface for direct connection to PC.
There is no Bootloader in ATmega32u4, but it has excellent compatibility of bootloader programming. Meanwhile, the programming steps is not so complicated.
It comes with two types of packages, ATMEGA321A-MU for QFN and ATMEGA32U4-AU for TQFP. The biggest difference between them is pin distance and shape. QFN is flat and comes with pins that are soldering on the bottom, while TQFP is a rectangle package with 0.5mm-interval pins. Though they are various in packages and pins, their functions are the same.
It has 32KB flash memory, 2.5KB SRAM and 1KB EEPROM. When data store in flash memory, device performs quickly. Additionally, large flash memory not only greatly reduces I/O bottleneck which waste the life cycle of CPU, but also results in bad performance of specific function.
Undoubtedly, Atmega32u4 is an useful device and gain huge popularity in integrated circuits, with its satisfying features. And still, we believe that this trend will not fade away in the future as long as smart consumer electronics keep strong in the market. If you would like to engage in this hopeful field, please feel free to contact us.
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