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ATtiny85 Microcontroller: Datasheet, Pinout, Specifications

Author: Iggy
Date: 25 Feb 2022
 14581
attiny85 circuit

ATtiny85 is 8-pin Microcontroller. This blog covers ATtiny85 Microcontroller pinout, datasheet, equivalent, features and other information on how to use this device.

Arduino Tutorial – ATtiny85 explained in 4 minutes!


Catalog

ATtiny85 Pinout

ATtiny85 Applications

ATtiny85 Features

ATtiny85 Advantage

ATtiny85 Circuit

ATtiny85 Package

ATtiny85 Block Diagram

ATtiny85 Parameters

ATtiny85 Manufacturer

ATtiny85 Documents

ATtiny85 Product Compliances

ATtiny85 Equivalents

ATtiny85 Alternatives

How to use ATtiny85

How to Safely Long Run ATtiny85 in Circuit

FAQ

Ordering & Quantity


ATtiny85 Pinout

attiny85 pinout


ATtiny85 Applications

  • Industrial machinery controlling systems
  • Solar applications
  • IOT based applications
  • Power supply and charger based applications
  • Weather sensor systems
  • Wireless communication applications
  • Security based applications
  • Medical & health equipment
  • Automobile related applications

ATtiny85 Features

  • High performance design
  • Low power consumption in operating mode on 1.8 volts current consumption is only 300uA & on power down mode current consumption is only 0.1uA on 1.8V.
  • Total number of Analog Input pins are 6
  • Contains 8 kilobytes of flash memory
  • Contains 512 bytes of SRAM
  • Contains 512 bytes of EEPROM
  • 32 Registers
  • Minimum & maximum temperature -40 degree centigrade to 105 degree centigrade
  • Advance RISC
  • Lock program functionality for programming code security
  • Contains total two 8-bit timers or counters one with compare mode and other is high speed.
  • Total number of I/O pins are 6
  • Universal Serial interface on pin 5,6 and 7.
  • Contains USI (Universal Serial Interface)
  • 4 channels 10 bit ADC
  • Watchdog programmable Timer
  • Minimum and maximum operating voltage from 1.8V DC to 5.5V DC

ATtiny85 Circuit

ATtiny85 Circuit


ATtiny85 Advantage

ATtiny85 is a small size 8 pin Microcontroller. It is an advance microcontroller with many good features in its small size. It is another famous microcontroller in 8pins small size microcontrollers. It comes with a lot of features which makes it an ideal small size microcontroller to use in different electronic applications. The 8 kilobytes flash memory, 512 bytes EEPROM and 512 bytes SRAM and many other good features makes it a robust small size microcontroller to run variety of program codes.

ATtiny85 Microcontroller

ATtiny85 Microcontroller

In other words we can also say it a small arduino but with limited IO pins, small flash memory, EEPROM and SRAM as compare to the ATmega328p but if your code is small and you want a smaller alternative to Arduino board or ATmega328p microcontroller then this chip can be used. Despite of less number of I/O pins the three pins can be used as analog pins to get the input from sensors.

There are also two other alternatives of ATtiny85 which are ATtiny25 and ATtiny45. But the amount of Flash, SRAM and EEPROM are different in all of them.


ATtiny85 Package

  • 8P3

ATtiny85 Package: 8P3

  • 8S2

ATtiny85 Package: 8S2

  • 20M1

ATtiny85 Package: 20M1


ATtiny85 Block Diagram

ATtiny85 Block Diagram


ATtiny85 Parameters

Program Memory Type Flash
Program Memory Size (KB) 8
CPU Speed (MIPS/DMIPS) 20
Data EEPROM/HEF (bytes) 512
Digital Communication Peripherals 1-SPI, 1-I2C
Capture/Compare/PWM Peripherals 5PWM
Timers 2 x 8-bit
Number of Comparators 1
Temperature Range (°C) -40 to 85
Operating Voltage Range (V) 1.8 to 5.5
Pin Count 8

 


ATtiny85 Manufacturer

Microchip Technology Inc. is a leading provider of microcontroller and analog semiconductors, providing low-risk product development, lower total system cost and faster time to market for thousands of diverse customer applications worldwide. Headquartered in Chandler, Arizona, Microchip offers outstanding technical support along with dependable delivery and quality.


ATtiny85 Documents

Appendix B - ATtiny25/45/85 Automotive Specification at 1.8V Datasheet

ATtiny25/45/85 - Complete Datasheet

ATtiny25/45/85 - Summary Datasheet

ATtiny25/45/85 Automotive - Complete Datasheet


ATtiny85 Product Compliances

USHTS

8542310001

CNHTS

8542319000

TARIC

8542319000


ATtiny85 Equivalents

The ATtiny85 can be replace with ATtiny25 and ATtiny45 but the amount of Flash memory, EEPROM and SRAM are different in both the alternatives.


ATtiny85 Alternatives

ATtiny25, ATtiny45, ATtiny25V, ATtiny45V, ATtiny85V


How to use ATtiny85

ATtiny85 works like any other microcontroller. If stated in one sentence, all that microcontrollers do is execute the application program saved in its memory. So in the case of controllers all there to do is write application program. Without programming controller simply stays idle.

ATtiny85 Microcontroller

Step by step procedure for programming ATtiny85 is explained below:

  1. First list the tasks to be done by the designing application.
  2. Write down the functions to be executed by controller to complete required tasks.
  3. Develop the program code for the functions in IDE software.
  4. After writing the program compile it to eliminate errors.
  5. Make the IDE generate HEX file for the written program after compiling.
  6. This HEX file contains the machine code which should be saved in microcontroller flash memory.
  7. Choose the programming device (usually SPI programmer made for AVR microcontrollers) which establishes communication between PC and ATTINY85. You can also program the microcontroller using UART Interface. Programming ATTINY85 can also be done by using ARDUINO boards.
  8. Run the programmer software and choose the appropriate hex file.
  9. Burn the HEX file of written program in ATTINY85 flash memory using this program.
  10. After disconnecting the programmer connect the appropriate peripherals for the controller and get the system started.

Once powered, the ATtiny85 executes the machine code saved in its memory to create the programmed response.


How to Safely Long Run ATtiny85 in Circuit

To get good performance for a long time or if you want to run the ATtiny85 for many years in your application or project it should be known that microcontrollers are very sensitive devices and the user must take care when working with them.

Do not exceed the supply voltage from 5.5V. Always check the voltage source output from an accurate digital millimeter before connecting it to the microcontroller. The DC current on per I/O pin should not be increased from 40mA and the DC current on positive supply and ground pins should not be increased from 200mA.

Check the polarity of pins before applying power and if you are soldering it on circuit board check and clean all the pins for short circuit before applying the power. Use IC socket to place the IC on breadboard or on circuit. IC socket also saves the IC from the heat generated from the soldering iron while soldering. The minimum storage temperature is -65 centigrade and maximum is +150 centigrade. However the minimum and maximum temperature for operating the chip is from -55 centigrade to +125 centigrade.


Component Datasheet

ATTINY85 Datasheet


FAQ

  • What can ATtiny85 be used for?

ATtiny85 comes with a serial peripheral interface (SPI) that is mainly used for communication between the microcontroller and other peripheral devices such as SD cards, sensors, and shift registers.

  • How do I Program my ATtiny85?

1. Go into your Arduino IDE under Tools > Board.
2. Select the option under that says ATtiny25/45/85.
3. Under Tools, select Processor: ATtiny85 and the Clock: Internal 1 MHz. ...
4. Change the Programmer setting to USBtinyISP.
5. When you're ready to upload, plug the ATtiny85 into the dedicated socket.

  • Does ATtiny85 Need Crystal?

ATtiny microprocessors can use an internal RC oscillator or an external crystal oscillator. External crystal oscillators are more accurate, but require two pins. For these low pin count devices it can be beneficial to use the internal oscillator.

  • What is Digispark ATtiny85?

The Digispark is an Attiny85 based microcontroller development board similar to the Arduino line, only cheaper, smaller, and a bit less powerful. ... The Digispark is shipped fully assembled except for the two included and easy to solder headers.

  • How do I Power ATtiny85?

This means that you can power it from USB, a tiny button-cell battery, or something in between such as a LiPo. The ATtiny85 (little black square) and a screen can be run on a coin cell. When powered from a USB bus (5v), and running at a clock speed of 1 MHz, the ATtiny85 will consume less than 2 mA.

  • How Do You Use Tiny AVR Programmer?

The Tiny AVR Programmer plugs directly into your USB port and provides a programming socket for the ATTiny45 and 85. Just slot an ATTiny into the socket, plug the programmer into your USB port and start up the Arduino IDE.

  • How Do I Program ATtiny85 with USBasp?

How to Program and Bootload ATtiny85 With USBasp
Step 1: Downloads and Materials. The first step to program your ATtiny85 is to download the necessary files to achieve this. ...
Step 2: Using the ATtiny Core Files. First you need to extract the files from within the zip file. ...
Step 3: Connecting the Pins. ...
Step 4: Uploading Your Sketch. ...

  • How do I Program My Raspberry Pi ATtiny85?

Step 1: Setup the Raspberry Pi. At the terminal of the Pi: ...
Step 2: Electrical Connections. Connect up the ATtiny85 to the Raspberry Pi GPIO (wire colours from the picture are given for reference): ...
Step 3: Test Avrdude Connection. ...
Step 4: Program the ATtiny85.

 

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