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ATTINY43U-MU
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Product Detailed Parameters
- Description：IC MCU 8BIT 4KB FLASH 20QFN
- Series：AVR® ATtiny
- Mfr：Microchip Technology
- Package：Tray
- Core Processor：AVR
- Core Size：8-Bit
- Speed：8MHz
- Connectivity：USI
- Peripherals：Brown-out Detect/Reset, POR, PWM, Temp Sensor, WDT
- Number of I/O：16
- Program Memory Size：4KB (2K x 16)
- Program Memory Type：FLASH
- EEPROM Size：64 x 8
- RAM Size：256 x 8
- Voltage - Supply (Vcc/Vdd)：1.8V ~ 5.5V
- Data Converters：A/D 4x10b
- Oscillator Type：Internal
- Operating Temperature：-40°C ~ 85°C (TA)
- Mounting Type：Surface Mount
- Supplier Device Package：20-QFN-EP (4x4)
- Package / Case：20-WFQFN Exposed Pad
- Grade：-
- Qualification：-
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Overview
The ATtiny43U-MU is an 8-bit AVR microcontroller in a 20-pad QFN/MLF package. It features 4K bytes of In-System Programmable Flash, 64 bytes EEPROM, and 256 bytes SRAM. The device includes an integrated boost converter enabling operation from 0.7V to 1.8V, or 1.8V to 5.5V when bypassed. Speed grades reach up to 8 MHz at 2.7V–5.5V or 4 MHz via the boost converter. It provides 16 programmable I/O lines, two 8-bit timers with PWM, a 10-bit ADC, and supports capacitive touch sensing.
Feature Summary
- Integrated boost converter enables low-voltage battery operation
- Supports capacitive touch sensing via QTouch Library
- Advanced RISC architecture for high throughput efficiency
- On-chip debug system and in-system programming capability
Applications
- Battery-powered applications using single AA or AAA cells
- Capacitive touch sensor interfaces
- Low-cost embedded control systems
- Portable devices requiring extended battery life
Procurement Notes
Verify the ordering suffix 'MU' corresponds to the 20-pad QFN/MLF package. Confirm the speed grade matches the required operating voltage range, specifically noting the distinction between boost converter active modes and external supply modes. Ensure the revision level meets project requirements regarding any known errata associated with specific manufacturing batches.
Selection Notes
Select this component when input voltages drop below standard logic thresholds, leveraging the internal boost converter. Consider the QFN/MLF package constraints for thermal management and PCB layout. Evaluate the need for capacitive touch capabilities versus standard digital I/O requirements to ensure peripheral utilization aligns with application complexity.
Part Context
This part belongs to the tinyAVR family, distinguished by the inclusion of an on-chip boost converter. Unlike standard AVR controllers, it operates effectively from very low supply voltages. The 'MU' suffix identifies the specific Quad Flat No-Lead/Micro Lead Frame packaging variant within the ATtiny43U product line.
Replacement Considerations
Direct substitutes include other ATtiny43U variants such as ATtiny43U-SU for SOIC packaging. Verify pin compatibility and package dimensions when considering alternative packages within the same electrical specification family.
