ATTINY28V-1MI Datasheet ATTINY28L-4PU, ATTINY28V-1AU, ATTINY28V-1MU | P1-P3

Features

• Utilizes the AVR

RISC Architecture

• AVR – High-performance and Low-power RISC Architecture

– 90 Powerful Instructions – Most Single Clock Cycle Execution

– 32 x 8 General-purpose Working Registers

– Up to 4 MIPS Throughput at 4 MHz

• Nonvolatile Program Memory

– 2K Bytes of Flash Program Memory

– Endurance: 1,000 Write/Erase Cycles

– Programming Lock for Flash Program Data Security

• Peripheral Features

– Interrupt and Wake-up on Low-level Input

– One 8-bit Timer/Counter with Separate Prescaler

– On-chip Analog Comparator

– Programmable Watchdog Timer with On-chip Oscillator

– Built-in High-current LED Driver with Programmable Modulation

• Special Microcontroller Features

– Low-power Idle and Power-down Modes

– External and Internal Interrupt Sources

– Power-on Reset Circuit with Programmable Start-up Time

– Internal Calibrated RC Oscillator

• Power Consumption at 1 MHz, 2V, 25°C

– Active: 3.0 mA

– Idle Mode: 1.2 mA

– Power-down Mode: <1 µA

• I/O and Packages

– 11 Programmable I/O Lines, 8 Input Lines and a High-current LED Driver

– 28-lead PDIP, 32-lead TQFP, and 32-pad MLF

• Operating Voltages

–V

: 1.8V - 5.5V for the ATtiny28V

–V

: 2.7V - 5.5V for the ATtiny28L

• Speed Grades

– 0 - 1.2 MHz for the ATtiny28V

– 0 - 4 MHz For the ATtiny28L

Pin Configurations

PDIP

RESET

PD0

PD1

PD2

PD3

PD4

VCC

GND

XTAL1

XTAL2

PD5

PD6

PD7

(AIN0) PB0

PA0

PA1

PA3

PA2 (IR)

PB7

PB6

GND

VCC

PB5

PB4 (INT1)

PB3 (INT0)

PB2 (T0)

PB1 (AIN1)

TQFP/QFN/MLF

PD3

PD4

VCC

GND

XTAL1

XTAL2

PB7

PB6

GND

VCC

PB5

PD5

PD6

PD7

(AIN0) PB0

(AIN1) PB1

(T0) PB2

(INT0) PB3

(INT1) PB4

PD2

PD1

PD0

RESET

PA0

PA1

PA3

PA2 (IR)

8-bit

Microcontroller

with 2K Bytes of

Flash

ATtiny28L

ATtiny28V

Summary

Rev. 1062FS–AVR–07/06

Note: This is a summary document. A complete document

is available on our Web site at www.atmel.com.

ATtiny28L/V

1062FS–AVR–07/06

Description The ATtiny28 is a low-power CMOS 8-bit microcontroller based on the AVR RISC archi-

tecture. By executing powerful instructions in a single clock cycle, the ATtiny28 achieves

throughputs approaching 1 MIPS per MHz, allowing the system designer to optimize

power consumption versus processing speed. The AVR core combines a rich instruction

set with 32 general-purpose working registers. All the 32 registers are directly con-

nected to the Arithmetic Logic Unit (ALU), allowing two independent registers to be

accessed in one single instruction executed in one clock cycle. The resulting architec-

ture is more code efficient while achieving throughputs up to ten times faster than

conventional CISC microcontrollers.

Block Diagram Figure 1. The ATtiny28 Block Diagram

The ATtiny28 provides the following features: 2K bytes of Flash, 11 general-purpose I/O

lines, 8 input lines, a high-current LED driver, 32 general-purpose working registers, an

8-bit timer/counter, internal and external interrupts, programmable Watchdog Timer with

internal oscillator and 2 software-selectable power-saving modes. The Idle Mode stops

the CPU while allowing the timer/counter and interrupt system to continue functioning.

The Power-down mode saves the register contents but freezes the oscillator, disabling

all other chip functions until the next interrupt or hardware reset. The wake-up or inter-

PROGRAM

COUNTER

INTERNAL

OSCILLATOR

WATCHDOG

TIMER

STACK

POINTER

PROGRAM

FLASH

MCU CONTROL

GENERAL

PURPOSE

REGISTERS

INSTRUCTION

TIMER/

COUNTER

INSTRUCTION

DECODER

DATA REGISTER

PORTB

PROGRAMMING

LOGIC

TIMING AND

CONTROL

INTERRUPT

UNIT

STATUS

ALU

PORTB

VCC

GND

CONTROL

LINES

ANALOG

COMPARATOR

8-BIT DATA BUS

OSCILLATOR

PORTD

DATA REGISTER

PORTA

PORTA CONTROL

XTAL2XTAL1

RESET

HARDWARE

STACK

DATA REGISTER

PORTD

DATA DIR

REG. PORTD

HARDWARE

MODULATOR

INTERNAL

CALIBRATED

OSCILLATOR

ATtiny28L/V

1062FS–AVR–07/06

rupt on low-level input feature enables the ATtiny28 to be highly responsive to external

events, still featuring the lowest power consumption while in the power-down modes.

The device is manufactured using Atmel’s high-density, nonvolatile memory technology.

By combining an enhanced RISC 8-bit CPU with Flash on a monolithic chip, the Atmel

ATtiny28 is a powerful microcontroller that provides a highly flexible and cost-effective

solution to many embedded control applications. The ATtiny28 AVR is supported with a

full suite of program and system development tools including: macro assemblers, pro-

gram debugger/simulators, in-circuit emulators and evaluation kits.

Pin Descriptions

VCC Supply voltage pin.

GND Ground pin.

Port A (PA3..PA0) Port A is a 4-bit I/O port. PA2 is output-only and can be used as a high-current LED

driver. At V

= 2.0V, the PA2 output buffer can sink 25 mA. PA3, PA1 and PA0 are

bi-directional I/O pins with internal pull-ups (selected for each bit). The port pins are tri-

stated when a reset condition becomes active, even if the clock is not running.

Port B (PB7..PB0) Port B is an 8-bit input port with internal pull-ups (selected for all Port B pins). Port B

pins that are externally pulled low will source current if the pull-ups are activated.

Port B also serves the functions of various special features of the ATtiny28 as listed on

page 27. If any of the special features are enabled, the pull-up(s) on the corresponding

pin(s) is automatically disabled. The port pins are tri-stated when a reset condition

becomes active, even if the clock is not running.

Port D (PD7..PD0) Port D is an 8-bit I/O port. Port pins can provide internal pull-up resistors (selected for

each bit). The port pins are tri-stated when a reset condition becomes active, even if the

clock is not running.

XTAL1 Input to the inverting oscillator amplifier and input to the internal clock operating circuit.

XTAL2 Output from the inverting oscillator amplifier.

RESET

Reset input. An external reset is generated by a low level on the RESET pin. Reset

pulses longer than 50 ns will generate a reset, even if the clock is not running. Shorter

pulses are not guaranteed to generate a reset.

P1-P3 P4-P6 P7-P9 P10-P12 P13-P13

ATTINY28V-1MI

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