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Feather 328P Atmega328 Atmega328P
AdafruitATmega328
A portable microcontroller board with an ATmega328P running at 8 MHz and 3.3V, featuring GPIO, analog inputs, I2C, SPI, and PWM pins.
In stock
Specifications
2- Operating Voltage
- 3.3V (regulated from USB or LiPo battery) [5V input] [4.2V max for LiPo] [3.7V typical] [3.2V min] [2V A6 pin due to resistor divider] [100mA lipoly charger] [500mA peak current output regulator] [3.3V reference voltage] [8 MHz clock speed] [32K flash memory] [2K RAM] [19 GPIO pins + 2 analog-in-only pins] [6 PWM pins] [8 x analog inputs (two shared with I2C)] [built-in 100mA lipoly charger with charging status indicator LED] [Pin #13 red LED for general purpose blinking] [Power/enable pin] [4 mounting holes] [Reset button] [Tiny prototyping area] [Measures 2.0 x 0.9
- Dimensions
- x 0.28 [51mm x 23mm x 8mm]
Pinout
20| Pin | Name | Functions | Notes |
|---|---|---|---|
| GND | GND | POWER | Common ground for all power and logic |
| BAT | BAT | — | Positive voltage to/from the JST jack for optional LiPo battery |
| USB | USB | POWER | Positive voltage to/from the micro USB jack if connected |
| EN | EN | — | 3.3V regulator's enable pin, pulled up by default |
| 3V | 3V | POWER | Output from the 3.3V regulator, can supply 500mA peak current |
| RX / #0 | GPIO #0 | GPIO | Receive (input) pin for Serial - Used for debug and bootloading |
| TX / #1 | GPIO #1 | GPIO | Transmit (output) pin for Serial - Used for debug and bootloading |
| SDA / A4 | Analog #4 | I2C | I2C data pin, no pull-up by default |
| SCL / A5 | Analog #5 | I2C | I2C clock pin, no pull-up by default |
| SCK / #13 | SPI Clock and GPIO #13 | SPIPWM | Can do PWM output and is connected to the red LED next to the USB jack |
| MOSI / #11 | SPI Microcontroller Out Serial In and GPIO #11 | SPIPWM | Can also do PWM output |
| MISO / #12 | SPI Microcontroller In Serial Out and GPIO #12 | SPI | |
| #2 | GPIO #2 | GPIO | Also Interrupt #0 |
| #3 | GPIO #3 | PWMGPIO | Can also do PWM output and act as Interrupt #1 |
| #4 | GPIO #4 | GPIO | |
| #5 | GPIO #5 | PWMGPIO | Can also do PWM output |
| #6 | GPIO #6 | PWMGPIO | Can also do PWM output |
| #7 | GPIO #7 | GPIO | |
| #9 | GPIO #9 | PWMGPIO | Can do PWM output |
| #10 | GPIO #10 | PWMGPIO | Can do PWM output |
Interactive pinout
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ATmega328
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