This document describes the features and characteristics of the AVR® RISC architecture microcontroller products ATtiny28V and ATtiny28L, including high-performance and low-power architecture, nonvolatile program memory, peripheral features, special microcontroller features, low-power modes, power consumption levels, I/O and packages, operating voltages, and speed grades.
The ATtiny28L is a low‑power 8‑bit CMOS microcontroller based on the AVR® RISC architecture. It offers 2 KB of Flash program memory, 11 programmable I/O lines, an 8‑bit timer/counter, an on‑chip analog comparator, a programmable watchdog timer, and a high‑current LED driver. The device operates from 2.7 V to 5.5 V and delivers up to 4 MIPS at 4 MHz, with active power consumption of 3 mA at 1 MHz, 2 V.
The datasheet includes a block diagram, pin descriptions for PDIP, TQFP and MLF packages, the register file architecture, status register layout, and clock source options (internal calibrated RC oscillator, external crystal, external clock). Electrical characteristics, absolute maximum ratings, and ordering information are also provided.
| Flash Program Memory | 2 KB |
|---|---|
| General‑purpose I/O Lines | 11 programmable I/O lines, 8 input lines |
| Operating Voltage (ATtiny28L) | 2.7 V – 5.5 V |
| Active Power Consumption (1 MHz, 2 V) | 3.0 mA |
| Idle Mode Power Consumption | 1.2 mA |
| Power‑down Mode Current | < 1 pA |
| Timer/Counter | One 8‑bit timer/counter with separate prescaler |
| Watchdog Timer | Programmable watchdog timer with on‑chip oscillator |
| LED Driver | Built‑in high‑current LED driver with programmable modulation |
| Package Options | 28‑lead PDIP, 32‑lead TQFP, 32‑pad MLF |
The ATtiny28L operates from 2.7 V to 5.5 V.
It provides 2 KB of flash program memory.
The active current is 3.0 mA.
The device can use an internal calibrated RC oscillator, external crystal/ceramic resonator, external low‑frequency crystal, external RC oscillator, or an external clock.