ATTINY20-UUR - 12MHz AVR MCU, 2KB Flash | Microchip
MPN: ATTINY20-UUR ✓ ActiveATTINY20-UUR Overview
A microcontroller is a compact programmable control component that integrates a processor core, nonvolatile program memory, working memory, and peripherals into one package. The ATtiny20 belongs to the AVR family of 8-bit RISC microcontrollers, which sit within the broader hierarchy of embedded processors and semiconductor devices. Its compact package and mixed-signal peripherals are useful for space-constrained embedded-control products that need deterministic local processing without a larger microcontroller.
The ATTINY20-UUR supports up to 12 MIPS throughput through a high-performance, low-power AVR architecture. Its 112-instruction set and most single-clock-cycle execution capability suit compact control loops, simple serial communication, and peripheral control. Program storage is organized as 2KB of Flash, while the 128-byte SRAM provides volatile working space. Twelve I/O lines allow the device to connect to sensors, indicators, actuators, and external control interfaces within a small board area.
The ATtiny20 family combines an 8-bit timer/counter with two PWM channels and a 16-bit timer/counter with a 10-bit comparator, according to the verified Microchip product-page data. These timers support periodic event generation, timing, and proportional control functions. The family operates from 1.8V to 5.5V, as identified in the verified comparison data, making it suitable for systems whose available supply voltage falls within that range.
Typical uses include compact consumer accessories, sensor-interface modules, LED and lighting controls, small motor-control functions, industrial control nodes, and embedded household products. The 12-ball WLCSP format is especially useful when minimizing component footprint is more important than using a leaded package. Designers should still plan PCB assembly and inspection around the very small ball pitch and provide suitable bypass capacitance close to the supply pins.
A principal design consideration is that the 2KB Flash capacity is intentionally modest. Code must be selected to fit available program memory, while the 128-byte SRAM requires careful attention to stack depth and buffer allocation. Firmware that otherwise fits can exceed practical memory constraints when interrupt handlers, libraries, and diagnostic code are added. A precise WLCSP land pattern, verified programming setup, and manufacturer-recommended decoupling are therefore essential to a reliable implementation.
This product record combines verified Microchip specifications, distributor availability and pricing references, package information, replacement analysis, and practical implementation guidance. It is intended to help engineers determine whether the ATtiny20's small memory footprint and compact 12-ball WLCSP package meet the needs of a specific embedded-control design.
Drop-in alternatives for ATTINY20-UUR — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
No drop-in alternatives available for this product.
Request AlternativesATTINY20-UUR Maximum Ratings & Electrical Characteristics
| Product Type | 8-bit AVR RISC-based microcontroller |
| Maximum Clock Frequency | 12 MHz |
| Flash Memory | 2 KB (1K x 16) |
| SRAM | 128 bytes |
| General-Purpose I/O Lines | 12 |
| General-Purpose Working Registers | 16 |
| Architecture | AVR RISC |
| Instruction Set | 112 instructions |
| Maximum Throughput | 12 MIPS |
| Execution Characteristic | Most instructions execute in a single clock cycle |
| 8-Bit Timer/Counter | 1 timer/counter with 2 PWM channels |
| 16-Bit Timer/Counter | 1 timer/counter with 10-bit comparator |
| Operating Voltage Range | 1.8 V to 5.5 V |
| Package | 12-ball WLCSP, 1.56 mm x 1.4 mm |
| Mounting Type | Surface mount |
ATTINY20-UUR 12-ball wlcsp, 1.56 mm x 1.4 mm Pin Configuration Guide
Pin configuration for ATTINY20-UUR (12-ball wlcsp, 1.56 mm x 1.4 mm package). This digital IC includes GPIO, communication interfaces (UART, SPI, I2C), and power pins. Refer to the manufacturer datasheet for alternate pin functions and configuration options. Essential for embedded system design and PCB layout.
No detailed pinout data available for ATTINY20-UUR.
Refer to the datasheet for full pin configuration.
Typical Applications
ATTINY20-UUR is suitable for 6 applications: Compact Sensor Interface, LED and Lighting Control, Small Motor and Actuator Control, Industrial Control Node, Consumer Accessory Controller, Battery-Powered Remote Control.
Compact Sensor Interface
ATTINY20-UUR fits a compact sensor-interface module where a 12MHz AVR core can sample a compact sensor, perform threshold logic, and update an indicator or communications output. Its 2KB ISP Flash and 128-byte SRAM are sufficient only for focused control code, so protocol buffers must remain small and code should avoid unnecessary library overhead. The 1.56mm by 1.4mm 12-ball WLCSP minimizes board area, while 12 I/O lines provide connections for sensors, control signals, and status feedback. The primary design check is memory sizing: validate stack, interrupt handlers, and serialization code before layout release.
Recommended
LED and Lighting Control
The ATtiny20's two PWM channels make ATTINY20-UUR suitable for small LED-driving or lighting-control products in which dimming, fading, or periodic effects must be implemented locally. Its 8-bit timer/counter can provide periodic timing, and 12MHz operation gives sufficient execution capacity for compact control sequences without an external timer IC. The 2KB Flash limit favors simple patterns and direct register-oriented firmware rather than elaborate graphics or general-purpose frameworks. In a 12-ball WLCSP design, PCB layout must preserve accurate LED-current paths while avoiding excess heat and assembly difficulty.
Recommended
Small Motor and Actuator Control
ATTINY20-UUR can supervise a small actuator, pump, fan, or motorized mechanism where the required sequence is straightforward and local timing is sufficient. The family provides an 8-bit timer/counter with two PWM channels and a 16-bit timer/counter with a 10-bit comparator, allowing timing and basic proportional functions without a large control IC. Its 1.8V-to-5.5V operating range supports multiple embedded supply domains, although motor transients still require separate protection. Firmware must fit the 2KB Flash and 128-byte SRAM limits, and the PCB should isolate switching current from sensitive control signals.
Recommended
Industrial Control Node
ATTINY20-UUR is suitable for a distributed industrial control node that handles a limited number of inputs and drives a small set of outputs close to the sensed equipment. Its 12 I/O lines and two PWM channels can support contact monitoring, status signaling, and basic actuator functions, while the 16 working registers and RISC-style execution model provide deterministic control. The 2KB program-memory ceiling makes this best suited to narrowly defined tasks rather than gateway or protocol-heavy nodes. Because industrial environments may contain large transients and long wiring, the implementation should include appropriate isolation, surge protection, and verified bypass components.
Recommended
Consumer Accessory Controller
ATTINY20-UUR can serve as the embedded controller in a small household or wearable accessory requiring button handling, low-rate timing, status indication, and limited actuator control. Its low-power AVR positioning, 1.8V-to-5.5V supply compatibility, and compact 12-ball WLCSP support space-sensitive products. The device is best suited to a narrowly defined state machine because only 2KB of Flash and 128 bytes of SRAM are available. Firmware should minimize dynamic allocation and deep call chains, while the PCB layout should keep sensitive inputs away from switching nodes and provide local supply bypass.
Recommended
Battery-Powered Remote Control
ATTINY20-UUR can implement a battery-powered remote or simple wireless-control front end when commands are decoded into local outputs and the firmware remains within its 2KB Flash capacity. Its 12MHz AVR core can execute compact protocol and control logic, while 12 I/O lines can support buttons, indicators, and a control output. The 1.8V operating limit permits compatibility with suitable low-voltage power systems, but the verified data does not quantify sleep current, so battery-life calculations require additional manufacturer information. A PCB redesign must also account for the WLCSP assembly process and careful grounding of radio-adjacent control signals.
Recommended
Recommended Products Summary
Engineering reference data for ATTINY20-UUR — comparison, design guidance, and compliance information.
Selection Guide
Design Notes
Do not release the layout from package dimensions alone. The verified source confirms a 12-ball WLCSP with a 1.56mm by 1.4mm body, but it does not provide the individual ball names, pitch, thermal-pad arrangement, or recommended land pattern. Download the official Microchip package drawing and use its specified footprint, solder mask, and paste geometry. This is especially important because a compact package can be electrically compatible in theory but difficult to assemble if paste volume, ball spacing, or thermal relief is incorrectly reproduced.
Budget the 1.8V-to-5.5V operating range against the actual supply tolerance, startup sequence, and attached peripherals. Place the required bypass capacitors at the supply and ground pins using the manufacturer's recommended layout; the verified data does not specify capacitor values or ESR requirements, so those details must be obtained from the full datasheet. Check that every pulled-up or externally driven signal remains within the selected supply domain, especially when the MCU operates below 3.3V while another device operates at a higher logic level.
The most significant firmware risk is memory exhaustion, not CPU throughput: the ATtiny20 provides only 2KB of Flash and 128 bytes of SRAM. Measure the final linked image, account for the interrupt-vector table, and test worst-case stack depth under interrupts. Avoid adding a conventional RTOS or oversized middleware unless the complete build has been measured. Also do not confuse the related ATTINY20-XUR and ATTINY20-MMH package variants with direct replacements for a 12-ball WLCSP PCB.
Compliance Information
The supplied verified web data does not explicitly state RoHS, REACH, AEC-Q100, lead-free, halogen-free, or conflict-minerals status for ATTINY20-UUR.
