ATMEGA164A-MCH - 16KB AVR MCU 20MHz 44-QFN | Microchip
料号： ATMEGA164A-MCH ✓ 量产中| 数量 | 单价 | 小计 |
|---|---|---|
| 1 | $5.62 | $5.62 |
| 10 | $5.1 | $51.00 |
| 100 | $4.5 | $450.00 |
| 500 | $3.98 | $1,990.00 |
| 1,000 | $3.55 | $3,550.00 |
ATMEGA164A-MCH 概述
An AVR ATmega microcontroller is a member of the microcontroller unit (MCU) family within the broader semiconductor hierarchy: MCU -> embedded processor -> integrated circuit. An MCU integrates a CPU core, program memory, data memory and peripherals (timers, serial interfaces, ADC) on a single die, replacing multi-chip designs in embedded systems and reducing both BOM count and PCB area. The 'A' suffix denotes the picoPower variant with revised sleep-mode current figures relative to the classic ATmega164P die.
Key features include 32 general purpose I/O lines and 32 general purpose working registers directly connected to the ALU for fast single-cycle operation. The memory architecture supports read-while-write ISP FLASH, enabling firmware updates in the field. Peripherals include a real-time counter, multiple timers with PWM, a 10-bit ADC, USART, SPI and TWI (I2C) serial interfaces, and JTAG for on-chip debugging and boundary scan. The advanced RISC Harvard architecture separates program and data buses, so instruction fetch and data access occur in parallel.
Operating from a 2.7 V to 5.5 V supply range (per distributor listings), the device suits both 3.3 V and 5 V designs. Power management includes idle, power-down, power-save and standby sleep modes for battery-operated products. The 44-QFN footprint saves board area versus TQFP while the exposed pad improves ground and thermal performance. Choose the system clock carefully - full 20 MHz operation requires a 4.5 V to 5.5 V supply, while lower-voltage rails limit the maximum safe frequency per the datasheet speed-grade table.
Typical applications include industrial control and automation nodes, consumer appliances, battery-powered instrumentation, and embedded controllers requiring in-field ISP firmware updates.
This page synthesizes distributor pricing, drop-in alternatives, pinout guidance, and practical design notes not found in the manufacturer datasheet.
直接替换替代料： ATMEGA164A-MCH ——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： ATMEGA164A-MCH （相同外形与封装尺寸） ——差异在于 ADC, Package, Communication Interfaces, EEPROM, Instructions.
快速对比工具——选择替代料号进行并排对比：
ATMEGA324A-MCHR
✅ 直接替换✓ 有现货
联系询价
查看数据手册 →ATMEGA644A-MCH
✅ 直接替换📋 参考替代料（不在目录中）
ATMEGA164P-20MU
✅ 直接替换✓ 有现货
$2.98 / 个
查看数据手册 →ATMEGA1284-MCH
✅ 直接替换📋 参考替代料（不在目录中）
ATMEGA16-16MUR
✅ 直接替换📋 参考替代料（不在目录中）
ATMEGA164A-MCH 最大额定值与电气特性
| Product Type | 8-bit AVR RISC Microcontroller |
| Family | ATmega |
| Program Memory (Flash) | 16 KB |
| EEPROM | 512 B |
| SRAM | 1 KB |
| Maximum CPU Speed | 20 MHz |
| CPU Throughput | 20 MIPS |
| Supply Voltage (Vcc) | 2.7 V to 5.5 V |
| I/O Pins | 32 |
| Working Registers | 32 x 8-bit |
| ADC | 10-bit |
| 封装 | 44-pin QFN (5x5 mm) with exposed pad |
| 数据总线宽度 | 8 bit |
| Instruction Set | AVR (131 instructions, mostly single-cycle) |
| Programming Interface | ISP / JTAG |
| 工作温度 | -40C to +85C (industrial) |
| 安装类型 | Surface Mount |
| RoHS 状态 | Compliant |
ATMEGA164A-MCH 引脚配置
| 引脚 1 | VCC — Digital supply voltage |
| 引脚 2 | GND — Ground |
| 引脚 3 | AVCC — Analog supply voltage |
| 引脚 4 | AREF — ADC reference voltage |
| 引脚 5 | ADC0/PA0 — Analog input / GPIO PA0 |
| 引脚 6 | ADC1/PA1 — Analog input / GPIO PA1 |
| 引脚 7 | ADC2/PA2 — Analog input / GPIO PA2 |
| 引脚 8 | ADC3/PA3 — Analog input / GPIO PA3 |
| 引脚 9 | ADC4/PA4 — Analog input / GPIO PA4 |
| 引脚 10 | ADC5/PA5 — Analog input / GPIO PA5 |
| 引脚 11 | ADC6/PA6 — Analog input / GPIO PA6 |
| 引脚 12 | ADC7/PA7 — Analog input / GPIO PA7 |
| 引脚 13 | PB0 — GPIO PB0 / PCINT8 |
| 引脚 14 | PB1 — GPIO PB1 / PCINT9 |
| 引脚 15 | PB2 — GPIO PB2 / PCINT10 |
| 引脚 16 | PB3 — GPIO PB3 / PCINT11 |
| 引脚 17 | PB4 — GPIO PB4 / PCINT12 |
| 引脚 18 | PB5 — GPIO PB5 / PCINT13 |
| 引脚 19 | PB6 — GPIO PB6 / PCINT14 |
| 引脚 20 | PB7 — GPIO PB7 / PCINT15 |
| 引脚 21 | PC0/SCL — GPIO PC0 / TWI SCL |
| 引脚 22 | PC1/SDA — GPIO PC1 / TWI SDA |
| 引脚 23 | PC2 — GPIO PC2 |
| 引脚 24 | PC3 — GPIO PC3 |
| 引脚 25 | PC4 — GPIO PC4 |
| 引脚 26 | PC5 — GPIO PC5 |
| 引脚 27 | PC6 — GPIO PC6 |
| 引脚 28 | PC7 — GPIO PC7 |
| 引脚 29 | RESET — Reset input (active low) |
| 引脚 30 | VCC — Digital supply voltage |
| 引脚 31 | GND — Ground |
| 引脚 32 | XTAL2 — Crystal oscillator output |
| 引脚 33 | XTAL1 — Crystal oscillator input |
| 引脚 34 | PD0/RXD0 — GPIO PD0 / USART0 RXD |
| 引脚 35 | PD1/TXD0 — GPIO PD1 / USART0 TXD |
| 引脚 36 | PD2/INT0 — GPIO PD2 / External INT0 |
| 引脚 37 | PD3/INT1 — GPIO PD3 / External INT1 |
| 引脚 38 | PD4/OC1B — GPIO PD4 / Timer1 OC1B |
| 引脚 39 | PD5/OC1A — GPIO PD5 / Timer1 OC1A |
| 引脚 40 | PD6/OC2B — GPIO PD6 / Timer2 OC2B |
| 引脚 41 | PD7/OC2A — GPIO PD7 / Timer2 OC2A |
| 引脚 42 | TCK — JTAG Test Clock |
| 引脚 43 | TMS — JTAG Test Mode Select |
| 引脚 44 | TDO — JTAG Test Data Out |
典型应用
ATMEGA164A-MCH 适用于 6 应用s: Industrial Control Nodes, Battery-Powered Sensor Hubs, Consumer Appliance Controllers, HMI and Display Modules, Motor Control and PWM Drive, Educational and Hobby Development.
Industrial Control Nodes
The ATMEGA164A-MCH is a strong fit for industrial control nodes thanks to its 32 GPIO, 10-bit ADC, USART, SPI and TWI peripherals, and 20 MIPS throughput at 20 MHz. Its -40C to +85C industrial temperature range and 2.7 to 5.5 V supply tolerance let it operate directly from a 24V->5V industrial bus. The 16 KB ISP flash with read-while-write supports in-field firmware updates via bootloader, critical for long-life factory equipment. JTAG debug simplifies bring-up of deterministic real-time control loops, while the 44-QFN package keeps the PCB footprint compact for DIN-rail mounted modules.
推荐
Battery-Powered Sensor Hubs
The ATMEGA164A-MCH picoPower variant supports idle, power-down, power-save and standby sleep modes, making it well suited for battery-powered sensor hubs and remote telemetry nodes. At 3.3 V supply and 8 MHz clock, active current stays in the low single-digit mA range, while power-down mode drops below 1 uA, enabling multi-year coin-cell runtime when duty-cycled. The 10-bit ADC and TWI peripheral allow direct interface to I2C sensors and battery monitors, and the 16 KB flash accommodates OTA-bootloader plus application code. The 44-QFN footprint keeps the PCB small for wearable and IoT form factors.
推荐
Consumer Appliance Controllers
The ATMEGA164A-MCH serves as a reliable main controller in consumer appliances such as washing machines, coffee makers, dishwashers and HVAC thermostats. Its 32 GPIO drive relays, triacs, keypads and displays directly, while PWM timers control motors, valves and dimmable lighting without an extra driver chip. ISP flash with read-while-write lets manufacturers push bug fixes and feature updates post-sale. The 2.7 to 5.5 V range supports both 3.3 V logic sensor interfaces and legacy 5 V systems, and the JTAG interface accelerates firmware development of real-time scheduling code.
推荐
HMI and Display Modules
The ATMEGA164A-MCH pairs well with character LCDs, OLED displays, and small TFT panels in HMI modules thanks to its high-throughput SPI peripheral and 20 MIPS performance. With 32 GPIO it can drive a 4x4 keypad, multiple status LEDs, and a TFT via hardware SPI, leaving CPU cycles free for menu logic. The 16 KB flash comfortably hosts a graphics library and UI state machine, while 1 KB SRAM supports double-buffered small displays. JTAG accelerates UI bring-up, and the 44-QFN package fits compact panel-mount enclosures.
推荐
Motor Control and PWM Drive
The ATMEGA164A-MCH's multiple 16-bit timer/counter PWM channels make it well suited for brushed DC motor control, stepper sequencing, and LED dimming in industrial and hobby applications. Hardware PWM frees the CPU from tight timing loops, while the 32 GPIO can directly interface to H-bridge drivers and encoder feedback. The 20 MIPS throughput handles trapezoidal and basic field-oriented control routines at modest RPM. With a 2.7 to 5.5 V supply, the same hardware supports both 3.3 V logic motor drivers and 5 V industrial systems.
推荐
Educational and Hobby Development
The ATMEGA164A-MCH is a popular choice in advanced hobbyist projects, university embedded courses, and retro computing thanks to its compact QFN footprint, generous 32 GPIO, and Arduino MiniCore support. With 16 KB flash, 1 KB SRAM and USART/SPI/TWI, students can build serial terminals, audio synthesizers, and custom peripherals. ISP programming via 6-pin header or JTAG via 10-pin header simplifies lab bring-up, and the picoPower modes let projects demonstrate low-power design techniques. The 44-QFN package encourages learning modern SMD rework skills.
推荐
推荐产品汇总
工程参考数据： ATMEGA164A-MCH ——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 | ATMEGA324A-MCHR | ATMEGA644A-MCH | ATMEGA164A-AU | ATMEGA164P-20MU |
|---|---|---|---|---|---|
| Package | 44-QFN | 44-QFN - same | 44-QFN - same | 44-TQFP | 44-QFN - same |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Flash Memory | 16 KB | 32 KB | 64 KB | 16 KB | 16 KB |
| SRAM | 1 KB | 2 KB | 4 KB | 1 KB | 1 KB |
| EEPROM | 512 B | 1 KB | 2 KB | 512 B | 512 B |
| Maximum Clock Speed | 20 MHz | 20 MHz | 20 MHz | 20 MHz | 20 MHz |
| I/O Pins | 32 | 32 | 32 | 32 | 32 |
| picoPower Variant | Yes | Yes | Yes | Yes | No (classic) |
| Supply Voltage | 2.7 V to 5.5 V | 2.7 V to 5.5 V | 2.7 V to 5.5 V | 2.7 V to 5.5 V | 2.7 V to 5.5 V |
关键差异点
- picoPower variant with sub-uA sleep currents （对比 ATMEGA164P-20MU)
- More flash and SRAM headroom in same footprint （对比 ATMEGA324A-MCHR)
- 44-QFN compact footprint with exposed pad （对比 ATMEGA164A-AU)
设计说明
The 44-QFN package has an exposed thermal pad that MUST be soldered to the PCB ground plane for both thermal dissipation and electrical grounding. Use an array of thermal vias (typically 9-16 vias on 0.5 mm pitch) under the pad to connect it to an inner ground plane, and ensure the pad solder paste aperture follows the datasheet recommendation to avoid voids that could starve ground or heat paths.
Place a 100 nF decoupling capacitor as close as possible to each VCC pin and a 10 uF bulk capacitor near the AVCC pin. Use a separate analog ground island connected to the main ground at a single point if analog reference accuracy is critical. The picoPower variant retains accurate ADC readings in sleep modes, but supply noise above 50 mVpp on AVCC will degrade ADC SNR.
Full 20 MHz operation requires a 4.5 V to 5.5 V supply - the speed grade drops to ~10 MHz at the lower end of the 2.7 V range per the datasheet. CKSEL fuse selection must match the chosen crystal or clock source, and an unprogrammed device defaults to the internal 1 MHz RC oscillator. When migrating from the ATmega164P to ATmega164A, review sleep current figures and ADC offset in the errata sheet.
合规信息
RoHS and REACH compliance per Microchip product page. Not AEC-Q100 qualified - the ATmega164A-MCH is intended for industrial and consumer use, not automotive. Lead-free reflow profile per JEDEC J-STD-020 is supported.
