ATTINY84A-MMHR

Overview

The ATtiny84A-MMHR is an 8-bit AVR microcontroller featuring 8K bytes of In-System Programmable Flash, 512 bytes of EEPROM, and 512 bytes of SRAM. It operates within a voltage range of 1.8V to 5.5V and supports clock speeds up to 20MHz at 4.5V–5.5V, 10MHz at 2.7V–5.5V, and 4MHz at 1.8V–5.5V. The device includes a 10-bit ADC with differential channels, two PWM-capable timers, and an analog comparator. It utilizes a 20-pad VQFN package (3x3x0.85mm) with NiPdAu lead finish and is rated for industrial temperatures from -40°C to +85°C.

Feature Summary

• Advanced RISC architecture executing most instructions in a single clock cycle for high throughput efficiency.
• Non-volatile memory segments including self-programmable Flash and EEPROM with high endurance ratings.
• Integrated peripheral suite comprising an 8-bit and 16-bit Timer/Counter with PWM, 10-bit ADC, and analog comparator.
• Multiple low-power operating modes including Idle, ADC Noise Reduction, Standby, and Power-down.

Applications

• Battery-powered embedded systems requiring low active and standby current consumption
• Industrial control interfaces utilizing the Universal Serial Interface and programmable I/O lines
• Sensor monitoring applications leveraging the 10-bit ADC with programmable gain stages
• Cost-sensitive consumer electronics using the compact VQFN package form factor

Procurement Notes

Verify the ordering suffix MMHR confirms the Very Thin Quad Flat No Lead package type and NiPdAu lead finish as specified in the official Microchip datasheet. Ensure the speed grade corresponds to the required operating voltage and temperature range for your specific application environment. Confirm that the tape and reel packaging format aligns with your automated assembly equipment requirements before finalizing procurement orders.

Selection Notes

Select this component when 8K bytes of program memory are necessary for complex firmware logic. The ATtiny84A offers superior processing performance compared to lower-density variants while maintaining compatibility with the same pinout and peripheral set. Consider the VQFN package for space-constrained designs where thermal dissipation through the exposed pad is manageable. Validate that the 20MHz maximum frequency meets the real-time processing demands of the target application.

Part Context

This device belongs to the ATtiny24A/44A/84A family of 8-bit AVR microcontrollers based on enhanced RISC architecture. The ATtiny84A represents the highest memory capacity variant in this series, providing 8K bytes of Flash memory. It shares identical pin configurations and peripheral features with the ATtiny24A and ATtiny44A, allowing for potential design flexibility across different memory requirements within the same hardware platform.

Replacement Considerations

Direct functional substitutes within the same package include other ATtiny84A variants with different speed grades or lead finishes, such as ATtiny84A-MMH. Cross-family replacements require careful verification of pin compatibility and peripheral availability. Always consult the latest datasheets to ensure electrical characteristics and timing parameters match the original design specifications.