Atmel ATTINY28L-4PU

ATtiny28L-4PU by Microchip Technology Product Summary

The ATtiny28L-4PU from Microchip Technology stands as an 8-bit microcontroller specifically structured for space- and power-constrained applications. Built on the proven AVR® RISC architecture, this microcontroller delivers an optimal balance between computational power and energy efficiency. With its 2 KB Flash memory, compact 28-lead PDIP form factor, and a maximum operating speed of 4 MHz, the ATtiny28L-4PU is positioned as a cost-effective choice for embedded systems designers requiring a blend of robust instruction capability and straightforward integration.

ATtiny28L-4PU Core Design and Processing Performance

At the heart of the ATtiny28L-4PU lies Atmel’s enhanced AVR RISC core. This architecture boasts 90 powerful instructions, most of which execute within a single clock cycle. Integrated within are 32 x 8-bit general-purpose working registers, each directly linked to the arithmetic logic unit (ALU), facilitating rapid data throughput—up to 4 MIPS at 4 MHz operation. Such efficiency enables developers to optimize software algorithms for reduced latency and enhanced system responsiveness, crucial for real-time embedded control applications.

ATtiny28L-4PU Memory Structure and Data Protection

The ATtiny28L-4PU is equipped with 2 KB of nonvolatile Flash program memory and offers a program memory endurance of up to 1,000 write/erase cycles. This memory configuration is further reinforced with a programmable lock feature aimed at safeguarding firmware against unauthorized access or tampering, an aspect critical in applications that demand data integrity and intellectual property protection.

ATtiny28L-4PU Peripheral Support and Distinct Features

Engineers will find the ATtiny28L-4PU’s integrated peripherals particularly advantageous. The device comes with an 8-bit timer/counter featuring a separate prescaler, a built-in analog comparator, and a programmable watchdog timer with an on-chip oscillator. Notably, the inclusion of a high-current LED driver with programmable modulation expands design versatility for indicators and display elements requiring direct microcontroller interfacing. Advanced interrupt and wake-up on low-level input functionality empower the device to promptly react to external events while consuming minimal power.

ATtiny28L-4PU Power Control and Operating Modes

A defining strength of the ATtiny28L-4PU is its sophisticated power management. The device supports multiple low-power operating modes—including Idle and Power-down. In Idle mode, only the CPU halts, allowing other subsystems (like timers or interrupts) to run, resulting in active current draws around 3.0 mA at 1 MHz, 2V, and 25°C. In deep Power-down mode, consumption drops to less than 1 μA, making it highly suited for battery-operated or energy-harvesting applications. These features enable system designers to fine-tune performance-to-consumption ratios based on application needs.

ATtiny28L-4PU I/O Arrangements and Packaging Selections

The ATtiny28L-4PU provides versatile I/O options, including 11 programmable lines and 8 additional input lines. Port A comprises a 4-bit I/O port with PA2 engineered as a dedicated high-current LED driver, while Ports B and D offer input and bi-directional capabilities with selectable pull-up resistors. The wide choice of packages—28-lead PDIP, 32-lead TQFP, and 32-pad MLF—affords engineers the flexibility to choose formats based on space, cost, and assembly constraints. The reliable reset, XTAL clock input/output, and tri-state behavior under reset further support robust system integration.

ATtiny28L-4PU Electrical Specifications and Environmental Ratings

Operating within a voltage range of 2.7V to 5.5V, the ATtiny28L-4PU is suitable for numerous power rail configurations commonly found in consumer and industrial systems. The device's RoHS and halide-free compliance ensures alignment with global environmental regulations, favoring adoption in new designs targeting regulated markets. The specified power consumption metrics and package-level mechanical tolerances enhance reliability in demanding operational settings.

ATtiny28L-4PU Engineering Use Cases

The ATtiny28L-4PU is particularly well-suited for embedded tasks such as smart sensors, signal monitoring, portable devices, and actuator controls. Its ability to execute most instructions in a single clock cycle makes it ideal for time-critical applications, while its power-saving modes enable extended service in applications where battery life is paramount. The integrated high-current LED driver demonstrates value in compact visual indicator systems. The device's robust interrupt system, watchdog timer, and flexible I/O structure further facilitate reliable operation in environments susceptible to signal disturbances.

ATtiny28L-4PU Comparable or Substitute Models

Selecting an MCU often prompts engineers to evaluate alternatives. Within the AVR family, the ATtiny28V serves as a direct variant, operating at lower voltages (1.8V-5.5V) and reduced speed (up to 1.2 MHz), making it a candidate for ultra-low-power applications. When seeking replacements outside the ATtiny28L-4PU platform, engineers should ensure equivalent Flash memory size, pin count, and performance requirements are met, while also considering the compatibility of development tools and peripherals.

Conclusion

: Selection Insights for the ATtiny28L-4PU Microcontroller

The Microchip Technology ATtiny28L-4PU delivers efficient computation, a comprehensive set of peripherals, and flexible I/O configurations in an easily deployable form factor. Its balanced approach to performance and low power consumption supports a multitude of embedded scenarios where bill of materials flexibility, power management, and board space are critical. By thoroughly understanding its core architectural advantages and application-specific features, engineers and procurement professionals can confidently assess the ATtiny28L-4PU as a core solution or capable alternative for compact microcontroller-based designs.