ATTINY85-20SU - 8-Bit 20MHz AVR MCU | Microchip
MPN： ATTINY85-20SU ✓ 啟用中ATTINY85-20SU 概覽
A microcontroller is a programmable semiconductor that integrates a CPU core, nonvolatile program memory, data memory, and peripherals on one device. The ATTINY85 belongs to the TinyAVR hierarchy: it is a low-power CMOS 8-bit microcontroller built around the AVR enhanced RISC architecture. Its small memory footprint and compact package are useful when the application requires local control without a larger processor or external memory.
Key verified features include 8 KB flash organized as 4K × 16, 512 bytes of EEPROM, 512 bytes of SRAM, six general-purpose I/O lines, 20 MHz operation, and an integrated 10-bit ADC according to the distributor and manufacturer-linked sources. The device also supports ISP programming, making firmware updates possible through the serial programming interface. Its 8-SOIC package is surface-mount and suitable for compact PCB layouts.
The ATTINY85 architecture is designed for simple control tasks that combine digital inputs, ADC measurements, timer activity, and PWM generation. Its 32 general-purpose working registers and one 8-bit timer/counter with compare modes support efficient small firmware routines. The verified data identifies the part as a functional-safety-related Microcontroller IC, although detailed safety certification parameters were not provided and should be confirmed from the manufacturer datasheet before safety-critical use.
Typical applications include battery-powered sensor nodes, compact motor-control interfaces, LED and indicator controllers, simple analog measurement systems, small consumer products, and compact industrial control modules. The six I/O lines are sufficient for small mixed-signal systems when pin multiplexing is carefully planned. The ADC allows analog inputs to be digitized without a separate converter, although the verified source set does not provide its full electrical limits.
A key design consideration is memory planning. Firmware must fit within the verified 8 KB flash capacity, while initialized data and stack usage must remain within 512 bytes of SRAM. For battery-powered designs, use the low-power operating modes and avoid leaving unused I/O pins in undefined states. Confirm voltage, clock, ADC accuracy, and absolute maximum ratings from the current Microchip datasheet before releasing a production design.
This page combines verified distributor specifications, source traceability, application guidance, and replacement constraints to help engineers evaluate the ATTINY85-20SU beyond a basic catalog listing. It emphasizes what is confirmed from the supplied data and clearly separates missing electrical details from verified facts.
直接替換替代品，適用於 ATTINY85-20SU — 相同封裝，腳位對腳位相容。需重新設計 PCB 的不同封裝零件不列入。
ATTINY85-20SUR
✅ 直接替換📋 參考替代品（不在目錄中）
ATTINY85-20SF
✅ 直接替換📋 參考替代品（不在目錄中）
ATTINY85-20SH
✅ 直接替換📋 參考替代品（不在目錄中）
ATTINY85-20SU 最大額定值與電氣特性
| Product Type | 8-bit RISC-based microcontroller |
| Architecture | AVR enhanced RISC |
| 最大時脈頻率 | 20 MHz |
| Flash Memory | 8 KB (4K × 16) |
| EEPROM | 512 bytes |
| SRAM | 512 bytes |
| General-Purpose I/O Lines | 6 lines |
| General-Purpose Working Registers | 32 registers |
| Timer/Counter | 1 × 8-bit timer/counter with compare modes |
| ADC | Integrated ADC |
| Programming | In-system programmable |
| 封裝 | 8-SOIC |
| Package Type | SOIC-8 |
| 安裝類型 | Surface mount |
ATTINY85-20SU soic-8 腳位配置指南
ATTINY85-20SU（soic-8 封裝）的腳位配置。 此數位 IC 包含 GPIO、通訊介面（UART、SPI、I2C）與電源腳位。替代腳位功能與配置選項請參閱製造商資料表。對嵌入式系統設計與 PCB 佈局至關重要。
無詳細腳位定義資料： ATTINY85-20SU.
請參閱 資料表 以查看完整腳位配置。
典型應用
ATTINY85-20SU 適用於 6 應用s: Battery-Powered Sensor Node, LED and Indicator Control, Small Motor-Control Interface, Analog Measurement Module, Compact Consumer-Control Product, Embedded Automation Controller.
Battery-Powered Sensor Node
The ATTINY85-20SU fits compact sensor nodes because it combines a 20 MHz AVR core, 6 I/O lines, an integrated ADC, and low-power CMOS architecture in an 8-SOIC package. It can acquire a sensor signal, apply thresholding or filtering, and control a digital indicator or actuator without a larger processor. The 8 KB flash and 512 bytes SRAM support compact embedded firmware, although battery sizing requires verified sleep-current and active-current data from the current Microchip datasheet.
推薦
LED and Indicator Control
For LED panels, status indicators, and low-current lighting controls, ATTINY85-20SU provides timer/counter compare modes and 6 general-purpose I/O lines in an 8-SOIC footprint. PWM-capable timer outputs can drive indicator brightness or simple motor/load control when the electrical current and drive requirements fit the selected external circuitry. The verified 20 MHz clock supports responsive debouncing and sequencing, while firmware must remain within the confirmed 8 KB flash and 512-byte SRAM limits.
推薦
Small Motor-Control Interface
ATTINY85-20SU can serve as the control brain for a small motor or actuator interface when the design uses low-voltage motors and externally switched loads. Its 20 MHz AVR core is suitable for timing, direction control, limit inputs, and PWM generation through the 8-bit timer/counter. The six I/O lines provide flexibility for sensors and control signals, but motor current, inductive transients, grounding, and protection must be handled outside the microcontroller; those electrical ratings are not provided in the verified source data.
推薦
Analog Measurement Module
The integrated ADC and 20 MHz AVR processing core make ATTINY85-20SU suitable for compact analog measurement modules that convert sensor inputs into digital values or simple control outputs. A typical circuit would condition the analog signal, route it to an ADC input, and use firmware to calibrate, threshold, and report the result. The verified data confirms an ADC but does not provide resolution, reference voltage, input limits, sampling time, or accuracy, so those parameters must be taken from the manufacturer datasheet before analog calibration.
推薦
Compact Consumer-Control Product
ATTINY85-20SU is suitable for small consumer devices that require local logic, a few digital controls, and modest memory rather than a high-performance application processor. Its 8-SOIC package can simplify compact board layouts, and the six I/O lines can support buttons, indicators, or a small display interface. Firmware can implement product logic, debouncing, and power sequencing within the verified 8 KB flash and 512-byte SRAM constraints; additional memory should be selected if the application requires larger buffers or richer connectivity.
推薦
Embedded Automation Controller
The ATTINY85-20SU can act as a small embedded automation controller for a machine, fixture, or distributed sensor interface. The 20 MHz AVR core provides enough timing flexibility for debouncing, state-machine logic, and timer-based control, while the ADC supports monitoring of one or more conditioned analog channels. Its six I/O lines and 8-SOIC package are valuable where space is limited. Industrial deployment should verify operating-temperature, ESD, EMC, and isolation requirements not included in the supplied specifications.
推薦
推薦產品摘要
工程參考資料，適用於 ATTINY85-20SU — 比較、設計指引及合規資訊。
選型指南
與替代品比較
| 參數 | 本產品 | ATTINY85-20SUR | ATTINY85-20SF | ATTINY85-20SH |
|---|---|---|---|---|
| Package | 8-SOIC | 8-SOIC | 8-SOIC | 8-SOIC |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Architecture | AVR enhanced RISC | AVR enhanced RISC | AVR enhanced RISC | AVR enhanced RISC |
| Maximum Clock Frequency | 20 MHz | 20 MHz | 20 MHz | 20 MHz |
| Flash Memory | 8 KB (4K × 16) | 8 KB | 8 KB | 8 KB |
| EEPROM | 512 bytes | 512 bytes | 512 bytes | 512 bytes |
| SRAM | 512 bytes | 512 bytes | 512 bytes | 512 bytes |
| General-Purpose I/O Lines | 6 lines | 6 lines | 6 lines | 6 lines |
主要差異化特點
- Compact 8-bit AVR integration (對比Larger 8-bit AVR controller)
- Same-family ordering flexibility (對比ATTINY85-20SF)
- Low component count for mixed-signal control (對比Discrete controller implementation)
設計說明
Design the ATTINY85-20SU supply and decoupling around the exact voltage limits in the current Microchip datasheet. Place the required supply capacitor close to the power pin and keep analog sensor returns away from switching nodes. The supplied data confirms a 5 V-class distributor description in one listing but does not provide complete operating-voltage limits, so do not infer the full supply range from a distributor snippet.
Reserve the 8-SOIC footprint with pin-1 orientation verified against the manufacturer package drawing. Keep ISP programming signals accessible and route them away from noisy motor or relay switching paths. The supplied data confirms an 8-SOIC package but does not provide a complete pin table, so use the official datasheet to finalize every connection and exposed programming access.
Check firmware size, SRAM allocation, and peripheral pin conflicts before committing to ATTINY85-20SU. The verified limits are 8 KB flash, 512 bytes EEPROM, 512 bytes SRAM, and 6 I/O lines. Leave stack headroom, avoid blocking delays in timing-sensitive code, and confirm ADC, timer, and programming functions against the current datasheet.
合規資訊
The supplied verified data does not state RoHS, REACH, AEC-Q100, lead-free, halogen-free, or conflict-minerals status. Confirm the exact Microchip ordering code and obtain the current manufacturer compliance declaration.