ATTINY40-MMH - 8-Bit AVR MCU, 4KB Flash, 12MHz | Microchip Technology
料号： ATTINY40-MMH ✗ 停产ATTINY40-MMH 概述
The ATTINY40 is a TinyAVR microcontroller, a subfamily of the 8-bit AVR family of RISC-based embedded controllers. Its on-chip resources combine program memory, SRAM, general-purpose registers, I/O, timers, and PWM functions in a small device intended for applications where control logic must operate reliably with limited memory and board area. The microcontroller's 12 I/O lines provide interfaces for sensors, switches, indicators, actuators, and external control signals.
Key features include 4 KB of ISP Flash memory, 256 bytes of SRAM, 16 general-purpose working registers, an 8-bit timer/counter with two PWM channels, and an additional 8/16-bit timer/counter. The 12 MHz operating speed supports responsive control-loop execution while the low-power CMOS architecture is suitable for battery-operated and embedded systems. The device uses an AVR enhanced RISC core with most instructions executing in a single clock cycle.
Typical uses include compact industrial control modules, temperature and environmental monitoring, LED and lighting controllers, small motor-control systems, keypad interfaces, sensor nodes, and programmable control boards. The ATtiny40 is useful when firmware logic, digital I/O, timers, and PWM are required without a high pin count or a larger general-purpose MCU package.
When designing around the ATTINY40-MMH, verify the MMH package drawing, pin assignments, clock source, programming interface, and electrical limits in the manufacturer datasheet before PCB layout. Keep ISP programming access available during development, confirm decoupling requirements at the supply pins, and check PWM timer behavior against the intended load. This page combines the device specifications, application guidance, comparison considerations, and practical design notes needed for initial engineering evaluation.
直接替换替代料： ATTINY40-MMH ——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-MMH （相同外形与封装尺寸） ——差异在于 Program Memory.
ATTINY40-SU
✅ 直接替换联系询价
查看数据手册 →ATTINY40-MMH 最大额定值与电气特性
| Product Type | 8-bit RISC-based microcontroller |
| Architecture | AVR enhanced RISC |
| Program Memory | 4 KB ISP Flash |
| Data Memory | 256 B SRAM |
| General-Purpose I/O Lines | 12 |
| General-Purpose Working Registers | 16 |
| 最大时钟频率 | 12 MHz |
| 8-Bit Timer/Counter | 1 timer/counter |
| PWM Channels | 2 |
| Additional Timer/Counter | 8/16-bit timer/counter |
| ADC | 2-channel ADC |
| Instruction Throughput | Approaching 1 MIPS per MHz |
| Process Technology | Low-power CMOS |
| Package Designation | MMH |
| 工作电源电压 | 3.3 V |
ATTINY40-MMH mmh 引脚配置指南
ATTINY40-MMH（mmh 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-MMH.
请参阅 数据手册 以查看完整引脚配置。
典型应用
ATTINY40-MMH 适用于 6 应用s: Compact Environmental Sensor Node, LED and Lighting Controller, Small Motor and Actuator Control, Industrial Button and Relay Interface, Battery-Powered Control Module, Programmable Logic Controller.
Compact Environmental Sensor Node
The ATTINY40-MMH fits a compact environmental sensing node because it combines a two-channel ADC, 12 general-purpose I/O lines, and timers in an 8-bit AVR device with 4 KB of ISP Flash and 256 bytes of SRAM. One ADC channel can sample an analog sensor while the other can monitor a reference or battery condition. Firmware can average readings, apply thresholds, and report status through a simple digital interface without a larger microcontroller. The 12 MHz clock supports responsive sampling and control loops, while the limited SRAM favors short measurement buffers and streaming processing rather than large sample histories.
推荐
LED and Lighting Controller
The ATTINY40-MMH can control LED brightness, status indicators, and simple lighting effects using its 8-bit timer/counter with two PWM channels. The two channels permit independent dimming or pattern generation without bit-banged timing, while the 12 I/O lines can support switches, mode buttons, relay logic, or fault signals. Its 256-byte SRAM is adequate for short animation tables and control state, and the 4 KB Flash capacity supports compact sequencing logic. Firmware should set the timer prescaler carefully to obtain the required PWM resolution and frequency.
推荐
Small Motor and Actuator Control
For small fans, valves, or proportional actuators, the ATTINY40-MMH provides PWM outputs, general-purpose digital control, and an additional 8/16-bit timer/counter. The dedicated timer resources simplify pulse generation, while the ADC can monitor a current or position-related analog signal. Its 12 MHz AVR core is suitable for basic closed-loop control when the motor and load are small and switching losses are controlled. A transistor or MOSFET driver, flyback protection, and appropriate bulk decoupling remain necessary because the MCU pins should not directly drive inductive loads.
推荐
Industrial Button and Relay Interface
The ATTINY40-MMH is appropriate for a compact human-machine interface or relay-control module because it provides 12 I/O lines, timers, and PWM in a small 8-bit controller. Firmware can debounce inputs, implement long-press and hold behavior, drive status LEDs, and sequence relay outputs with defined delays. The 8/16-bit timer/counter supports longer timing intervals while the ADC can be used for analog supervision where needed. Because relay coils and contactors generate transients, the board should include driver transistors, flyback components, isolation where appropriate, and defined separation between logic and high-current paths.
推荐
Battery-Powered Control Module
The ATTINY40-MMH suits a small battery-powered controller because it uses low-power CMOS technology and provides the timers, ADC, and digital I/O needed for local control without a larger MCU. The 12 MHz operating frequency allows short, responsive active intervals, while firmware can place the device into a low-power state between measurements. The 256-byte SRAM is suitable for compact state machines rather than large buffers, and the four-channel PWM capability can regulate indicators or small actuator signals. Battery life depends on the selected operating mode, clock configuration, sensor load, leakage, and the quiescent current of the complete board.
推荐
Programmable Logic Controller
The ATTINY40-MMH can serve as the controller for a compact programmable logic module handling discrete inputs and timed outputs. Its 12 I/O lines are adequate for modest sensor and actuator counts, while the timer resources support pulse generation, debouncing, periodic scanning, and PWM-based control. The AVR enhanced RISC core and 12 MHz clock provide deterministic execution for straightforward state-machine logic. The 4 KB Flash limit requires concise firmware and careful table design, while the 256-byte SRAM requires streaming or compact buffering. For expansion, preserve ISP access and assign unused I/O to a documented expansion header.
推荐
推荐产品汇总
工程参考数据： ATTINY40-MMH ——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 |
|---|---|---|
| Architecture | AVR enhanced RISC, 8-bit | AVR enhanced RISC, 8-bit |
| Brand | Microchip Technology | Microchip Technology |
| Package | MMH | MMH family package designation |
| Program Memory | 4 KB ISP Flash | 4 KB ISP Flash |
| Data Memory | 256 B SRAM | 256 B SRAM |
| Maximum Clock Frequency | 12 MHz | 12 MHz |
| General-Purpose I/O Lines | 12 | 12 |
| ADC | 2-channel ADC | 2-channel ADC |
| PWM Channels | 2 PWM channels | 2 PWM channels |
| Operating Supply Voltage | 3.3 V | 3.3 V |
关键差异点
- Combines ADC, timers, and two PWM channels in a compact 8-bit AVR controller （对比 ATtiny40)
- Supports timing-intensive control with dedicated timer resources （对比 ATtiny40)
- Low resource footprint for focused embedded logic （对比 ATtiny40)
设计说明
Place the supply bypass capacitor close to the ATtiny40 power pins and keep the ground return path short. Preserve the manufacturer-recommended programming access in the PCB layout so an ISP programmer can reach the device without soldering adapters. Because the complete MMH pin assignment is not visible in the product listing, assign tracks only after checking the pin-description table and package drawing in the ATtiny40 manufacturer datasheet.
Do not select a substitute solely because it is labeled an ATtiny40-family device. The replacement must match the MMH footprint, pin multiplexing, voltage limits, ADC channels, timer channels, PWM outputs, clock requirements, and programming connection. The available cross-reference results do not establish a distinct qualified drop-in replacement, so a new footprint or firmware migration should not be assumed.
The ATTINY40-MMH operates from a 3.3 V supply in the listed device information, but the complete power budget depends on clock speed, ADC use, I/O loading, and enabled peripherals. Estimate worst-case supply current with the selected operating mode, then size the regulator for digital load plus analog-sensor current. Add local bulk capacitance where the load changes quickly and confirm regulator ripple against the ADC and timing requirements.
Route analog inputs away from PWM outputs, switching nodes, relay-driver traces, and other fast-edge signals. Use a compact ground reference around the ADC input path, keep sensor traces short, and avoid sharing high-current return paths beneath the MCU. If the two PWM channels drive external circuitry, separate their timing-sensitive logic from sensitive analog connections to reduce switching coupling.
合规信息
Compliance attributes were not confirmed in the ATtiny40 manufacturer product listing excerpt. The related ATtiny40 search result contains an embedded RoHS details reference, but it does not provide an explicit compliant or non-compliant status.
