1 Features and Pinout

Features of MCU and Curiosity Nano, Board Layout Picture, Board Block Diagram, Pinout Diagram.

1.1 ATtiny3227 Key Features

The tinyAVR® 2 family of microcontrollers use the AVR® CPU with hardware multiplier, running at up to 20 MHz, with 32 KB Flash, 3 KB of SRAM, and 256B of EEPROM. The family uses the latest technologies from Microchip with a flexible and low-power architecture, including an Event System, advanced digital peripherals, and accurate analog features such as a 12-bit differential ADC with Programmable Gain Amplifier (PGA).

High-Performance AVR® RISC CPU with Hardware Multiplier
  • Running at up to 20 MHz
  • Single Cycle I/O Access
  • Two-level Interrupt Controller
  • Sleep modes: Idle, Standby, Power-down
  • Six channels Event System
  • Configurable Custom Logic (CCL)
  • Single-pin programming and debugging interface (UPDI)
Analog Features
  • 12-bit Differential ADC with Programmable Gain Amplifier (PGA)
  • Analog Comparator with internal DAC reference
Timer/Counters
  • 1x 16-bit Timer/Counter type A (TCA)
  • 2x 16-bit Timer/Counter type B (TCB)
  • 1x 16-bit Real Time Counter (RTC) with Periodic Interrupt Controller (PIT)
Built-in Safety Functions
  • Power-On Reset (POR)
  • Brown-Out-Detection (BOD)
  • Voltage Level Monitor (VLM)
  • Cyclic Redundancy Check (CRC) Scan
  • Watchdog Timer (WDT) with Window Mode
Communication
  • Serial communication interfaces: SPI, I2C, 2x USART

1.2 Board Features

  • ATtiny3227 Microcontroller
  • USB Type-C® Connector
  • One Yellow User LED
  • One Mechanical User Switch
  • One green power and status LED
  • Footprint for 32.768 kHz Crystal
  • On-Board Debugger support in Microchip MPLAB® X IDE:
    • Board identification
    • Virtual serial port (CDC)
    • Programming and debugging
    • Two debug GPIO channels (DGI GPIO)
  • USB Powered
  • Adjustable Target Voltage:
    • MIC5353 LDO regulator controlled by the on-board debugger
    • 1.8–5.1V output voltage (limited by USB input voltage)
    • 500 mA maximum output current (limited by ambient temperature and output voltage)

1.3 Board Overview

Figure 1-1 1-2. ATtiny3227 Curiosity Nano Board Overview

1.4 Block Diagram

Figure 1-1 1-2. ATtiny3227 Curiosity Nano Board Block Diagram

1.5 Pinout

All the ATtiny3227 I/O pins are accessible at the edge connectors on the board. The image below shows the board pinout. Refer to the I/O Multiplexing and Considerations section in the ATtiny3227 data sheet for all available functions on each pin.

Figure 1-3. ATtiny3227 Curiosity Nano Pinout