ATTINY20-SSU - 12MHz 8-Bit AVR MCU | Microchip Technology
料号： ATTINY20-SSU ✓ 量产中ATTINY20-SSU 概述
An 8-bit microcontroller is a programmable integrated circuit designed to execute control logic, measure analog inputs, and coordinate digital peripherals. The ATTINY20 belongs to the ATtiny family, which combines a compact AVR enhanced RISC core with low-power CMOS operation and integrated mixed-signal peripherals. In the product hierarchy, it is an AVR microcontroller, an embedded processor, and a semiconductor intended for cost-sensitive embedded applications.
The device's 2 KB Flash memory provides 1K x 16 bits of program storage for bootloader and application code. Its 128-byte SRAM supports working variables and stack operations, while 16 general-purpose working registers support efficient instruction execution. A single-cycle execution strategy allows the architecture to approach 1 MIPS per MHz, making the 12 MHz clock capable of responsive control without a larger processor.
Integrated peripherals reduce the component count of compact control boards. The 10-bit ADC supports analog measurement, the I2C and SPI interfaces allow connection to sensors and serial devices, and the timer resources include an 8-bit timer with two PWM channels and a 16-bit timer. The 12 available GPIO lines can support digital inputs, outputs, interrupts, and common bus functions through the device's multiplexing capabilities.
Typical applications include compact sensor nodes, simple motor and actuator controllers, low-cost industrial interfaces, LED and lighting controllers, and small battery-powered instruments. The ATtiny20-UUR is a related site-listed device, while the ATTINY20-SSUR is the tape-and-reel ordering form of the same 14-SOIC microcontroller family and can support automated assembly workflows.
When designing a board, verify every 14-pin SOIC signal against the manufacturer pin-description table, especially multiplexed functions and supply pins. Provide a stable decoupled VCC connection, route programming and serial signals away from noisy analog inputs, and include an accessible programming interface for production programming and field updates.
This product page combines manufacturer specifications, package and programming guidance, source links, comparison parameters, and application-oriented design notes to support faster component selection and PCB implementation. It also identifies where pin, electrical, and lifecycle details require confirmation against the current manufacturer documentation before a production release.
直接替换替代料： ATTINY20-SSU ——相同封装，引脚兼容。需要 PCB 改动的不同封装料号已排除。
ATTINY20-SSUR
✅ 直接替换📋 参考替代料（不在目录中）
ATTINY20-SSU 最大额定值与电气特性
| Product Type | 8-bit AVR RISC microcontroller |
| 最大时钟频率 | 12 MHz |
| Program Flash Memory | 2 KB (1K x 16 bits) |
| SRAM | 128 bytes |
| General-Purpose I/O Lines | 12 lines |
| General-Purpose Working Registers | 16 registers |
| ADC Resolution | 10 bits |
| Timer/Counter | 8-bit timer/counter with 2 PWM channels |
| Additional Timer | 16-bit timer/counter |
| Serial Interfaces | I2C and SPI |
| Supply Voltage Options | 2.5 V, 3.3 V, and 5 V |
| 工作温度范围 | -40°C to +85°C |
| Architecture | AVR enhanced RISC |
| Implementation | Low-power CMOS |
| Throughput | Approximately 1 MIPS per MHz |
| 封装 | 14-pin SOIC |
| 引脚数量 | 14 pins |
| 安装类型 | Surface mount |
| Programming Interface | In-system programmable serial interface |
ATTINY20-SSU 引脚配置
| 引脚 1 | PB0 — Port B input/output pin 0 |
| 引脚 2 | PB1 — Port B input/output pin 1 |
| 引脚 3 | PB2 — Port B input/output pin 2 |
| 引脚 4 | PB3 — Port B input/output pin 3 |
| 引脚 5 | GND — Ground supply pin |
| 引脚 6 | PA6 — Port A input/output pin 6 |
| 引脚 7 | PA7 — Port A input/output pin 7 |
| 引脚 8 | PA4 — Port A input/output pin 4 |
| 引脚 9 | PA5 — Port A input/output pin 5 |
| 引脚 10 | PA3 — Port A input/output pin 3 |
| 引脚 11 | PA2 — Port A input/output pin 2 |
| 引脚 12 | PA0 — Port A input/output pin 0 |
| 引脚 13 | PA1 — Port A input/output pin 1 |
| 引脚 14 | VCC — Power supply input pin |
典型应用
ATTINY20-SSU 适用于 6 应用s: Compact Sensor Node, Small Motor Controller, LED Lighting Controller, Industrial Interface Module, Battery-Powered Instrument, Programmable Logic Controller.
Compact Sensor Node
The ATTINY20-SSU fits compact sensor nodes because its 12 MHz AVR core provides responsive control while the integrated 10-bit ADC handles analog sensor inputs. The 12 GPIO lines can support digital sensing, interrupts, status indicators, and external peripherals without requiring a larger controller. I2C and SPI connections allow designers to add compatible sensors or nonvolatile storage. The main design constraint is the 2 KB Flash limit, so firmware should use a compact bootloader and efficient state machine. Use the 12 GPIO lines for compact sensor nodes while preserving the exact ATtiny20 pin functions in the PCB schematic.
推荐
Small Motor Controller
The ATTINY20-SSU can implement a small stepper, DC motor, or actuator controller where compactness and deterministic control matter. Its 8-bit timer/counter provides two PWM channels for speed or position-related drive signals, while the 16-bit timer/counter supports longer timing intervals. Twelve GPIO lines leave room for direction controls, Hall inputs, limit switches, and fault signals. Because the device has only 2 KB of Flash and 128 bytes of SRAM, motion routines should be compact and table-driven. Add suitable driver transistors or motor drivers between the MCU pins and the load.
推荐
LED Lighting Controller
The ATTINY20-SSU is appropriate for LED status, indication, and basic dimming circuits because its timer resources support two PWM outputs and its 12 GPIO lines can control multiple channels. The 12 MHz clock provides enough timing resolution for common indicator patterns, while the 10-bit ADC can support ambient-light or potentiometer input if analog control is required. Keep the firmware concise because Flash memory is limited to 2 KB. Use current-limiting resistors or a constant-current driver and verify that PWM polarity and timer output routing match the LED driver circuitry.
推荐
Industrial Interface Module
The ATTINY20-SSU can serve as a small industrial interface or condition-monitoring module when the required logic is limited and the operating range of -40°C to +85°C is adequate. The I2C interface supports addressable sensors and expansion devices, SPI supports higher-speed peripherals, and the ADC handles analog process inputs. Its 12 GPIO lines can implement discrete alarms, interlocks, and status outputs. Industrial deployment should include proper input protection, isolation where required, and communication galvanic separation as appropriate. Verify operating-temperature, ESD, and EMC requirements during system qualification.
推荐
Battery-Powered Instrument
The ATTINY20-SSU is suitable for small battery-powered instruments because it combines a low-power CMOS AVR implementation with a modest 12 MHz clock and 128 bytes of SRAM. The MCU can manage a sparse user interface, run low-rate measurements, and use its ADC or serial interfaces to gather sensor data. Peripherals should be selected to avoid holding the MCU active when no measurement is required. Battery life also depends strongly on the ADC, serial interfaces, pull networks, and regulator architecture, so the complete power budget should be measured rather than inferred from the core clock alone.
推荐
Programmable Logic Controller
The ATTINY20-SSU can act as a compact programmable logic controller for simple sequencers, lamp panels, and discrete automation tasks. Sixteen working registers support the AVR core's fast instruction execution, while 12 GPIO lines provide enough external connections for inputs and outputs at small scale. Two PWM channels and the 16-bit timer extend its usefulness beyond basic on/off control. Firmware organization becomes the main constraint because 2 KB of Flash is sufficient for focused logic but not elaborate supervisory software. A robust design should include startup validation and defined behavior for invalid inputs.
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推荐产品汇总
工程参考数据： ATTINY20-SSU ——对比、设计指导和合规信息。
选型指南
与替代料对比
| 参数 | 本产品 | ATTINY20-SSUR |
|---|---|---|
| Package | 14-pin SOIC | 14-pin SOIC |
| Brand | Microchip Technology | Microchip Technology |
| Core Architecture | AVR enhanced RISC | AVR enhanced RISC |
| Maximum Clock Frequency | 12 MHz | 12 MHz |
| Program Flash Memory | 2 KB (1K x 16 bits) | 2 KB (1K x 16 bits) |
| SRAM | 128 bytes | 128 bytes |
| General-Purpose I/O Lines | 12 lines | 12 lines |
| ADC Resolution | 10 bits | 10 bits |
| Supply Voltage Options | 2.5 V, 3.3 V, and 5 V | 2.5 V, 3.3 V, and 5 V |
| Operating Temperature Range | -40°C to +85°C | -40°C to +85°C |
| Programming Method | In-system serial programming | In-system serial programming |
| Production Packing Format | Tube | Tape and reel |
关键差异点
- Direct 14-pin SOIC fit for the target design （对比 ATTINY20-SSUR)
- Exact ATTINY20 peripheral configuration （对比 ATTINY24V-10SSUR)
- Compact mixed-signal resource set （对比 ATTINY13A-SFR)
设计说明
Route the ATTINY20-SSU power pins directly to a low-impedance ground plane and place the manufacturer-recommended bypass capacitor close to VCC and GND. Keep the ISP data, clock, and reset traces short and accessible to the programming connector. Because several GPIO pins provide multiplexed timer and serial functions, assign those functions in the schematic before routing them to connectors or test points.
Do not treat a shared 14-pin SOIC outline as proof of drop-in compatibility. ATTINY24A-SSUR and ATTINY24V-10SSUR differ from ATTINY20 in device configuration, and their voltage, memory, timer, and pin-function requirements can change the schematic and firmware. Before substitution, compare the manufacturer pin-description tables, clock limits, fuse options, and application code assumptions.
Plan the 2.5 V, 3.3 V, or 5 V operating point before configuring the clock and ADC. Supply voltage, ADC reference, and maximum clock frequency are linked constraints in many AVR designs. Confirm that regulator startup, load transients, and programming voltage levels meet the device requirements. Use the electrical-characteristics table rather than estimating logic thresholds from the nominal supply alone.
Keep the analog input path away from ISP clock, switching-node, and high-current return paths. The integrated 10-bit ADC may require a quiet reference and adequate settling time when sampling low-level sensors. Place analog and digital ground-return paths according to the board's current distribution, and avoid routing high-current motor or relay returns directly beneath the microcontroller area.
The 2 KB Flash and 128-byte SRAM limits require disciplined firmware design. A bootloader, interrupt vectors, application logic, and data tables must all fit within available program memory, while call depth and buffered data can constrain RAM usage. Include compile-time checks for code size and stack margin, and avoid using unused I/O pins as mandatory board functions without checking their reset and default states.
合规信息
Compliance status must be confirmed against the current Microchip product declaration for the exact ordering code. No verified compliance statement was available.
