ATMEGA324PB-ANR - 8-bit AVR MCU 20MHz 32KB Flash | Microchip
料号： ATMEGA324PB-ANR ✓ 量产中| 数量 | 单价 | 小计 |
|---|---|---|
| 1 | $4.12 | $4.12 |
| 10 | $3.71 | $37.10 |
| 100 | $3.3 | $330.00 |
| 500 | $2.96 | $1,480.00 |
| 1,000 | $2.64 | $2,640.00 |
ATMEGA324PB-ANR 概述
A microcontroller (MCU) is a single-chip computer that integrates a processor core, memory, and programmable peripherals into one IC, forming the lowest layer of the embedded-systems hierarchy (MCU -> embedded processor -> semiconductor). The ATmega324PB is the peripheral-rich member of the ATmega324 lineage, based on the AVR enhanced RISC architecture with 32 general purpose working registers executing most instructions in a single clock cycle.
Key features include picoPower technology for low active and sleep current, five flexible timer/counters (more than any other ATmega324 variant), a Peripheral Touch Controller (PTC) supporting 32 self-capacitance buttons or up to 256 mutual-capacitance buttons via the QTouch Library, and extended peripheral connectivity including I2C, SPI, and USART serial interfaces. The device offers 39 general purpose I/O lines and additional port E I/O that differentiate it from the ATmega324A and ATmega324P.
Architecturally, the ATmega324PB adds Core Independent Peripherals (CIPs) that operate without CPU intervention, offloading deterministic tasks such as timing and touch sensing from software. This reduces interrupt latency effects and improves real-time behavior in industrial and human-interface designs.
Typical applications include capacitive touch user interfaces, industrial control and automation nodes, consumer appliance panels, and general-purpose embedded control where in-system programmable Flash with read-while-write capability simplifies field firmware updates.
A key design consideration is supply selection: this 5 V grade part tolerates the full 20 MHz clock, whereas lower-voltage operation requires derating the maximum clock frequency per the AVR frequency-voltage curve. Place 100 nF decoupling capacitors on every VCC/AVCC pin pair and keep crystal traces short.
This page synthesizes distributor pricing, verified drop-in alternatives across the ATmega324 family, pin/package compatibility notes, and practical design guidance not found in the manufacturer datasheet alone.
直接替换替代料： ATMEGA324PB-ANR ——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： ATMEGA324PB-ANR （相同外形与封装尺寸） ——差异在于 Package, Packaging, Program Memory Size, RoHS Status, Core Processor.
快速对比工具——选择替代料号进行并排对比：
ATMEGA324PB-AU
✅ 直接替换 ⚠️ 规格未核验📋 参考替代料（不在目录中）
ATMEGA324A-AU
✅ 直接替换✓ 有现货
$2.09 / 个
查看数据手册 →ATMEGA324PA-AUR
✅ 直接替换✓ 有现货
$1.98 / 个
查看数据手册 →ATMEGA324P-20AUR
✅ 直接替换✓ 有现货
$4.52 / 个
查看数据手册 →ATMEGA324P-20AUR
✅ 直接替换 ⚠️ 规格未核验✓ 有现货
$4.52 / 个
查看数据手册 →ATMEGA324PB-ANR 最大额定值与电气特性
| Core Processor | AVR |
| Core Size | 8-Bit |
| Speed | 20 MHz |
| Program Memory Size | 32 KB (16K x 16) Flash |
| Program Memory Type | ISP FLASH |
| EEPROM Size | 1 KB |
| RAM Size | 2 KB SRAM |
| Number of I/O | 39 |
| Number of Timers/Counters | 5 flexible timer/counters |
| Connectivity | I2C, SPI, USART |
| Touch Controller | QTouch PTC, 32 self-cap / 256 mutual-cap buttons |
| Architecture Features | RISC, 32 general purpose working registers, picoPower |
| 电源电压 | 5 V |
| 封装 / 外壳 | 44-TQFP (10x10 mm) |
| 安装类型 | Surface Mount |
| Packaging | Tape & Reel (TR) |
| Grade | Extended Temperature, Green |
| Safety Qualification | Functional Safety (FuSa) supported family |
| RoHS 状态 | Compliant (Green package) |
ATMEGA324PB-ANR 44-tqfp (10x10 mm) 引脚配置指南
ATMEGA324PB-ANR（44-tqfp (10x10 mm) 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： ATMEGA324PB-ANR.
请参阅 数据手册 以查看完整引脚配置。
典型应用
ATMEGA324PB-ANR 适用于 6 应用s: Capacitive Touch User Interfaces, Industrial Control and Automation Nodes, Consumer Appliance Control Panels, Battery-Powered Portable Devices, Embedded Networking and Sensor Gateways, Hobby, Maker, and Educational Platforms.
Capacitive Touch User Interfaces
The ATMEGA324PB-ANR fits touch HMI applications directly because its QTouch Peripheral Touch Controller acquires capacitive sensor signals in hardware, supporting 32 self-capacitance buttons or up to 256 mutual-capacitance buttons, and is supported by the QTouch Composer tool with project builder and analyzer. In a typical appliance or control panel, the MCU scans touch electrodes autonomously, freeing the 20 MHz AVR core for display driving and communication. Using hardware PTC scanning instead of software polling yields more consistent sensitivity under changing load conditions and lower active current via picoPower sleep between scans. The 39 GPIO lines eliminate the need for an I/O expander in most medium-size panel designs.
推荐
Industrial Control and Automation Nodes
In industrial control, the ATMEGA324PB-ANR provides the deterministic peripheral set demanded by automation nodes: five timer/counters generate multi-channel PWM for actuators while USART, I2C, and SPI interfaces link sensors and higher-level controllers. The family's Functional Safety (FuSa) support simplifies qualification documentation for safety-related equipment. Core Independent Peripherals continue timing and waveform tasks even when firmware services higher-priority code, reducing jitter versus older ATmega324A/324P parts. In-system programmable 32 KB Flash with read-while-write enables field firmware updates without halting operation, and the 44-TQFP 10x10 mm package suits standard industrial SMT assembly on 5 V backplane-powered boards.
推荐
Consumer Appliance Control Panels
Appliance panels combine touch or button inputs, LED or LCD indication, and motor/relay control - exactly the ATmega324PB's profile. The 39 general purpose I/O lines drive segments, relays, and buzzers directly, while the QTouch PTC implements wheel, slider, or button gestures without an external touch IC. PicoPower technology cuts standby current in sleep modes so the product meets standby-power regulations. Operating from a 5 V rail derived from the mains supply keeps the I/O directly compatible with relay driver stages. The 20 MHz clock provides ample headroom for temperature-compensated touch algorithms and display multiplexing within a single 44-TQFP device.
推荐
Battery-Powered Portable Devices
The ATmega324PB's picoPower technology targets battery-operated designs: multiple sleep modes with low leakage, and the PB generation reduces active current relative to ATmega324A/324P for the same 32 KB/2 KB memory profile. A 2-cell battery or single lithium cell with a small LDO supplies the MCU, and the Peripheral Touch Controller enables key-free waterproof buttons - valuable in wearables and handheld meters. The five timer/counters allow one timer to maintain an RTC tick in asynchronous mode while others manage PWM backlighting and sensor gating. Firmware can wake, sample sensors over SPI or I2C, transmit via USART, and return to deep sleep in milliseconds, maximizing battery life.
推荐
Embedded Networking and Sensor Gateways
With independent hardware USART, I2C, and SPI modules, the ATMEGA324PB-ANR can simultaneously bridge a RS-485/USART field bus, an I2C sensor cluster, and an SPI external Flash or radio module. The 2 KB SRAM buffers packet payloads while the 32 KB Flash stores protocol stacks with room for OTA-updatable application code using read-while-write programming. Core Independent Peripherals handle baud-rate-accurate timing and CRC-assisted transfers without CPU supervision, improving link reliability at 20 MHz. For cost-sensitive gateways that do not need the PB's extra peripherals, the pin-compatible ATMEGA324A-AU offers the same 44-TQFP footprint as a sourcing fallback during shortages.
推荐
Hobby, Maker, and Educational Platforms
The ATmega324 family is supported by open-source toolchains (AVR-GCC, avrdude) and the MightyCore Arduino hardware package, which explicitly lists ATmega324PB alongside ATmega1284, ATmega644, and ATmega324. This makes the ATMEGA324PB-ANR attractive for maker boards needing more I/O and Flash than an ATmega328: 39 GPIO, five timers, and hardware touch sensing in one TQFP-44. Educators benefit from the 8-bit AVR architecture's simplicity and the breadth of available learning material, while the in-system programmable Flash lets students reflash through a SPI header without a dedicated programmer. Tape-and-reel -ANR packaging suits student kit volume assembly.
推荐
推荐产品汇总
工程参考数据： ATMEGA324PB-ANR ——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 | ATMEGA324PB-AU | ATMEGA324A-AU | ATMEGA324PA-AUR | ATMEGA324P-20AUR |
|---|---|---|---|---|---|
| Package | 44-TQFP (10x10 mm) | 44-TQFP (10x10 mm) - same | 44-TQFP (10x10 mm) - same | 44-TQFP (10x10 mm) - same | 44-TQFP (10x10 mm) - same |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Core / Speed | AVR 8-bit, 20 MHz | AVR 8-bit, 20 MHz | AVR 8-bit, 20 MHz | AVR 8-bit, 20 MHz | AVR 8-bit, 20 MHz |
| Flash / SRAM / EEPROM | 32 KB / 2 KB / 1 KB | 32 KB / 2 KB / 1 KB | 32 KB / 2 KB / 1 KB | 32 KB / 2 KB / 1 KB | 32 KB / 2 KB / 1 KB |
| QTouch PTC | Yes (32 self-cap / 256 mutual-cap) | Yes | No | No | No |
| PicoPower / CIP | Yes | Yes | No (standard) | picoPower yes, CIP no | No |
| Packaging | Tape & Reel (TR), extended temp, green | Tray | Tray | Tape & Reel | Tape & Reel |
关键差异点
- Hardware QTouch Peripheral Touch Controller （对比 ATMEGA324A-AU)
- Most timers in the ATmega324 family (5 timer/counters) （对比 ATMEGA324P-20AUR)
- Extended temperature green tape-and-reel packaging （对比 ATMEGA324PB-AU)
设计说明
The ATMEGA324PB-ANR is a 5 V grade device rated for the full 20 MHz clock. The AVR frequency-voltage relationship requires derating the maximum clock at lower VCC; verify your operating point against the datasheet 'Active Clock frequency vs VCC' curve. Place 100 nF ceramic decoupling capacitors directly at each VCC pin and one at AVCC, with AVCC fed through a low-pass filter (10 nH ferrite or 10 ohm resistor plus 100 nF) when ADC accuracy matters.
Keep the crystal/oscillator traces between PB6 (XTAL1) and PB7 (XTAL2) as short as possible and surround them with a ground guard ring when using the 20 MHz crystal. The 44-TQFP 10x10 mm footprint has 0.8 mm pitch, manageable with standard reflow; ensure the stencil design avoids excessive paste on center pad (if your footprint includes one) to prevent solder-bump lift. Route touch electrodes away from switching traces to preserve QTouch PTC sensitivity.
Firmware written for ATmega324A/324P must be re-checked before porting to the PB: the PB adds port E and extra timer peripherals, and register maps differ. Conversely, when substituting a 324A/324P for the PB, any code using the QTouch PTC or the fifth timer will fail - the peripherals simply do not exist on those dies. Also note the -ANR suffix is the extended-temperature green tape-and-reel version; do not confuse it with commercial-temperature -AU tray parts in BOM documentation.
合规信息
Mouser lists the part as GREEN (RoHS-compliant, lead-free, halogen-free per Microchip green packaging definition). Exact REACH and conflict-minerals declarations should be confirmed via Microchip's compliance portal.