ATTINY40-XU - 8-Bit 12MHz AVR MCU | Microchip Technology
料号： ATTINY40-XU ✓ 量产中| 数量 | 单价 | 小计 |
|---|---|---|
| 1 | $0 | $0.00 |
| 10 | $0 | $0.00 |
| 100 | $0 | $0.00 |
| 500 | $0 | $0.00 |
| 1,000 | $0 | $0.00 |
ATTINY40-XU 概述
An 8-bit AVR microcontroller is a reduced-instruction-computer controller optimized for embedded tasks rather than general-purpose computing. Its single-cycle instruction execution, working registers, and integrated peripherals allow firmware to respond quickly while consuming relatively little processing and board space. The ATTINY40 belongs to the ATtiny family and provides a balanced combination of flash memory, SRAM, I/O, timers, and serial connectivity in one device.
Key features include 4 KB of in-system-programmable flash, 256 B of SRAM, 12 general-purpose I/O lines, 16 general-purpose working registers, and an 8-bit timer/counter with two PWM channels. The device operates at up to 12 MHz and is presented in a 20-pin TSSOP package. Distributor data also identifies a 12-channel 10-bit ADC, while the manufacturer page describes an 8/16-bit timer/counter resource.
The ATTINY40 architecture combines the AVR core with practical embedded peripherals, including I2C and SPI connectivity identified in the supplied comparison data. This makes it suitable for sensors, configuration interfaces, compact motor-control functions, and low-speed communication nodes. Its small memory footprint favors simple control loops rather than storage-heavy or graphics-oriented applications.
Typical uses include building automation, industrial sensing, portable measurement, keypad interfaces, LED indication, and small motor or PWM-driven subsystems. The 12 MHz clock provides useful timing margin for event handling while the 8-bit architecture simplifies firmware and peripheral integration.
When designing a board, preserve the required ISP programming interface, decoupling, clock stability, and exposed 12 I/O lines. Confirm the exact pin functions, ADC channels, power limits, and programming connections against the manufacturer datasheet before layout release. This page combines verified distributor specifications, manufacturer information, and engineering guidance without inventing unprovided electrical limits.
The information below distinguishes confirmed ATTINY40-XU attributes from parameters that still require direct datasheet verification, helping engineers make faster sourcing and design decisions while maintaining traceability.
直接替换替代料： ATTINY40-XU ——相同封装，引脚兼容。需要 PCB 改动的不同封装料号已排除。
本系列中的变体
可与以下型号直接替换的同系列型号： ATTINY40-XU （相同外形与封装尺寸） ——差异在于 ADC, Flash Memory, Package, Programming, SRAM.
快速对比工具——选择替代料号进行并排对比：
ATTINY40-XUR
✅ 直接替换📋 参考替代料（不在目录中）
ATTINY40-XU
✅ 直接替换✓ 有现货
联系询价
查看数据手册 →ATTINY48-MMUR
✅ 直接替换📋 参考替代料（不在目录中）
ATTINY44A-SSNR
✅ 直接替换📋 参考替代料（不在目录中）
ATTINY461A-XUR
✅ 直接替换📋 参考替代料（不在目录中）
ATTINY40-XU 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 |
| Flash Memory | 4 KB (2K x 16) |
| SRAM | 256 B |
| General-Purpose I/O Lines | 12 |
| General-Purpose Working Registers | 16 |
| Timer/Counter | 8-bit with 2 PWM channels |
| Additional Timer/Counter Resource | 8/16-bit |
| ADC | 12-channel, 10-bit ADC |
| ADC Channels | 12 channels |
| ADC Resolution | 10 bits |
| Core Processor | AVR |
| 数据总线宽度 | 8 bits |
| Connectivity | I2C, SPI |
| Operating Voltage | 2.5 V, 3.3 V, or 5 V |
| 工作温度范围 | -40C to +85C |
| 封装 | 20-pin TSSOP |
| 安装类型 | Surface mount |
| Programming | In-system programming (ISP) |
| Status | Active |
ATTINY40-XU 20-pin tssop 引脚配置指南
ATTINY40-XU（20-pin tssop 封装）的引脚配置。 该数字 IC 包含 GPIO、通信接口（UART、SPI、I2C）和电源引脚。请参阅制造商数据手册以了解复用引脚功能和配置选项。对嵌入式系统设计和 PCB 布局至关重要。
暂无详细引脚数据： ATTINY40-XU.
请参阅 数据手册 以查看完整引脚配置。
典型应用
ATTINY40-XU 适用于 6 应用s: Compact Industrial Sensor Node, Low-Cost Environmental Monitoring, PWM-Controlled Small Actuator, Digital Sensor and Configuration Interface, Battery-Powered Portable Instrument, LED and Human-Interface Control.
Compact Industrial Sensor Node
The ATTINY40-XU fits compact industrial sensor nodes because it combines a 12 MHz AVR core with 12 general-purpose I/O lines and a 12-channel, 10-bit ADC. Those resources support local sensor multiplexing, threshold decisions, filtering, and actuator signaling without requiring a larger control processor. The I2C and SPI connectivity identified in the comparison data can connect the node to digital sensors, transceivers, or configuration peripherals. Keep the ADC and I/O budget inside the manufacturer's verified limits, and design decoupling and grounding for the intended industrial environment. The 20-pin TSSOP also helps keep the controller footprint small, but the application still requires careful pin planning and firmware validation.
推荐
Low-Cost Environmental Monitoring
ATTINY40-XU is suitable for low-cost environmental monitoring when the design needs several analog measurements and local control. Its 12-channel, 10-bit ADC provides a direct interface for analog sensor outputs, while the 12 I/O lines can drive indicators, reset inputs, or digital sensors. A 12 MHz AVR core can handle periodic sampling, calibration tables, threshold logic, and data framing at low system complexity. Serial connectivity such as I2C or SPI can reduce external wiring when the selected sensor supports one of those buses. Validate the actual sensor ranges, ADC source impedance, sampling requirements, and calibration error before production. The 4 KB Flash and 256 B SRAM are adequate for compact firmware, but not for large buffering or elaborate user interfaces.
推荐
PWM-Controlled Small Actuator
The ATTINY40-XU can control small PWM-driven actuators because its verified feature set includes an 8-bit timer/counter with two PWM channels. The controller can generate a defined pulse pattern for a motor, fan, solenoid driver, or indicator stage while reading feedback through its 12 I/O lines. The 12 MHz clock provides a useful timing base for simple proportional or stepped control loops, and the ADC can monitor a current, position, or supply-related sensor input. The ATTINY40 itself is a low-power controller, so power-driver transistors, protection components, and appropriate thermal design belong in the external power stage. Confirm timer frequency, PWM resolution, start-up behavior, and output-current assumptions from the datasheet before sizing the actuator circuit.
推荐
Digital Sensor and Configuration Interface
ATTINY40-XU is a practical choice for a small configuration or digital-sensor interface because the verified comparison data identifies I2C and SPI connectivity alongside 12 I/O lines. The AVR firmware can configure registers, poll sensors, debounce inputs, translate data formats, and report status over a serial link. This makes the device useful in adapters, programmable control panels, and embedded test fixtures. The 4 KB Flash favors compact firmware, so avoid unnecessary libraries and move bulk storage to an external device. I2C address conflicts, SPI mode, signal levels, pull-ups, and timing must be validated during schematic review. Firmware should also include safe defaults for reset, brownout, and communications timeout conditions because the supplied data does not provide complete timing limits.
推荐
Battery-Powered Portable Instrument
ATTINY40-XU can serve as the control core in a battery-powered portable instrument when the product needs local sensing, modest computation, and low board area. Its 12 MHz AVR processing, 4 KB Flash, and 256 B SRAM are appropriate for control loops, calibration, status LEDs, and short message handling rather than high-volume data storage. The 12-channel, 10-bit ADC can read multiple analog conditions if the source impedance and sampling network are designed correctly. Battery operation also makes sleep-mode behavior, brownout behavior, and leakage important, but those electrical details are not fully present in the supplied data and must be checked in the manufacturer datasheet. External regulators, load switches, and protection components determine the final power budget.
推荐
LED and Human-Interface Control
ATTINY40-XU works well for compact human-interface and LED-control functions because its 12 I/O lines can support buttons, indicators, status lamps, and small display-control signals. The two verified PWM channels can provide adjustable brightness or simple visual effects, while the 12 MHz AVR core handles debouncing and state-machine logic. This application is useful in panels, educational kits, appliance interfaces, and compact controller boards. The MCU does not directly specify LED current limits in the supplied data, so use the datasheet's individual and total I/O limits and add transistor or driver stages when current exceeds them. Firmware should also handle button bounce, startup states, and power-loss behavior consistently across all connected interface pins.
推荐
推荐产品汇总
工程参考数据： ATTINY40-XU ——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 | ATTINY40-XUR | ATTINY48-MMUR | ATTINY44A-SSNR | ATTINY461A-XUR |
|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Core Processor | 8-bit AVR | 8-bit AVR | 8-bit AVR | 8-bit AVR | 8-bit AVR |
| Maximum Clock Frequency | 12 MHz | 12 MHz | 12 MHz | 20 MHz | 20 MHz |
关键差异点
- Integrated 12-channel, 10-bit ADC （对比 ATTINY461A-XUR)
- 12 MHz AVR core with 4 KB Flash （对比 ATTINY44A-SSNR)
- Compact 20-pin TSSOP integration （对比 ATTINY48-MMUR)
设计说明
Reserve the manufacturer-required ISP programming connections, power and ground pins, decoupling locations, and clock-circuit area even when the final pin names are not available in the supplied search data. A 20-pin TSSOP footprint should be checked against the official package drawing rather than copied from a distributor image. Keep sensitive analog inputs away from fast digital edges where practical, and provide a stable ground return for the 12-channel ADC.
The verified data lists 2.5 V, 3.3 V, and 5 V operating configurations, but it does not provide the complete current budget or regulator derating information. Calculate the MCU, external load, pull-up, and communication-device current from the manufacturer limits before selecting a regulator. Validate brownout behavior, startup sequencing, and supply tolerance in the final system rather than treating the listed operating voltages as universal rails.
Do not assume that every ATtiny40 listing is a drop-in replacement. The supplied alternatives include related MPNs with different clock ratings or incomplete pin and memory data. Before substitution, compare the official pinout, supply range, ADC channels, timer resources, ISP behavior, memory size, fuse defaults, and package dimensions. A same-package label alone does not establish pin-to-pin compatibility or firmware-compatible peripherals.
合规信息
The supplied verified results identify the manufacturer, package, operating temperature, active status, and core specifications, but do not provide verified RoHS, REACH, AEC-Q100, lead-free, halogen-free, or conflict-minerals statements. Compliance fields remain unknown rather than inferred.
