ATSAMG55J19A-MU - Cortex-M4 MCU 120MHz 512KB Flash 64-QFN | Microchip
MPN： ATSAMG55J19A-MU ✓ 啟用中ATSAMG55J19A-MU 概覽
A microcontroller (MCU) is a single-chip computer that integrates a CPU core, memory (Flash and SRAM), and programmable peripherals. Within the broader hierarchy, the SAM G55 belongs to ARM Cortex-M4 microcontrollers -> 32-bit MCUs -> embedded microcontrollers -> integrated circuits. The Cortex-M4 with single-precision FPU enables efficient DSP and floating-point math for audio, motor control, and signal-processing tasks.
Key features include up to 120 MHz CPU clock, 512 KB Flash, up to 176 KB SRAM, full-speed USB 2.0 with on-chip PHY, I2S audio interface for digital audio streaming, and picoPower technology delivering down to 100 uA/MHz active and below 7 uA in deep sleep with SRAM retention. Wake-up from deep sleep to first instruction is as fast as 3 us. The integrated FPU accelerates audio codecs and DSP workloads without external math processors.
The SAM G55 architecture combines an MPU (Memory Protection Unit), hardware AES, and a flexible peripheral set including HS USB, USB on-the-go, up to two I2S/TDM interfaces, multiple UART/SPI/TWI, and a 12-bit ADC. Compared to Cortex-M0/M3 parts, the Cortex-M4 with FPU executes single-precision math in a single cycle, dramatically reducing CPU load for audio and motor-control algorithms.
Typical applications include USB audio headsets and USB headphones, Bluetooth audio bridges, IoT edge nodes with USB connectivity, industrial sensor hubs, and low-power consumer audio products. The combination of USB 2.0 FS, I2S, and Cortex-M4 DSP makes it well suited to audio streaming tasks.
Designers should pay attention to decoupling: place 100 nF + 4.7 uF ceramic capacitors near each VDD pin and keep the QFN exposed pad soldered to a continuous ground plane for thermal dissipation and signal integrity.
This page synthesizes distributor pricing, drop-in alternatives drawn from the same SAM G55 family, and practical design notes not found in the manufacturer datasheet alone.
直接替換替代品，適用於 ATSAMG55J19A-MU — 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。
此系列的變體
與下列產品可直接替換的同系列型號： ATSAMG55J19A-MU （相同外形與佔位） — 差異在於 Package, Operating Temperature, Audio Interface, Core Architecture, USB.
ATSAMG55J19A-MUT
✅ 直接替換聯絡詢價
查看資料表 →ATSAMG55J19B-MU
✅ 直接替換📋 參考替代品（不在目錄中）
ATSAMG55J19B-MUT
✅ 直接替換聯絡詢價
查看資料表 →ATSAMG55J19A-AU
✅ 直接替換聯絡詢價
查看資料表 →ATSAMG55J19A-MU 最大額定值與電氣特性
| Core Processor | ARM Cortex-M4F (with FPU) |
| Core Size | 32-Bit |
| Maximum CPU Speed | 120 MHz |
| Program Memory Size | 512 KB Flash |
| RAM Size | Up to 176 KB SRAM |
| 供應電壓 | 3.0 V to 3.6 V |
| 工作溫度 | -40C to +85C (Industrial) |
| 封裝 | 64-pin QFN (7.5x7.5 mm) |
| 安裝類型 | Surface Mount |
| USB Interface | USB 2.0 Full-Speed with on-chip PHY |
| Audio Interface | I2S / TDM (up to 2 instances) |
| Active Current (picoPower) | 100 uA/MHz |
| Deep Sleep Current | <7 uA with SRAM retention |
| Wake-up Time | Down to 3 us from deep sleep |
| RoHS 狀態 | Compliant |
ATSAMG55J19A-MU 腳位配置
| 腳位 1 | VDDIO — I/O supply voltage |
| 腳位 2 | PA0 — GPIO / peripheral function |
| 腳位 3 | PA1 — GPIO / peripheral function |
| 腳位 4 | PA2 — GPIO / peripheral function |
| 腳位 5 | PA3 — GPIO / peripheral function |
| 腳位 6 | PA4 — GPIO / peripheral function |
| 腳位 7 | PA5 — GPIO / peripheral function |
| 腳位 8 | VDDIO — I/O supply voltage |
| 腳位 9 | GND — Ground |
| 腳位 10 | PA6 — GPIO / peripheral function |
| 腳位 11 | PA7 — GPIO / peripheral function |
| 腳位 12 | PA8 — GPIO / peripheral function |
| 腳位 13 | PA9 — GPIO / peripheral function |
| 腳位 14 | PA10 — GPIO / peripheral function |
| 腳位 15 | PA11 — GPIO / peripheral function |
| 腳位 16 | VDDIO — I/O supply voltage |
| 腳位 17 | PA12 — GPIO / peripheral function |
| 腳位 18 | PA13 — GPIO / peripheral function |
| 腳位 19 | PA14 — GPIO / peripheral function |
| 腳位 20 | GND — Ground |
| 腳位 21 | PB0 — GPIO / peripheral function |
| 腳位 22 | PB1 — GPIO / peripheral function |
| 腳位 23 | PB2 — GPIO / peripheral function |
| 腳位 24 | PB3 — GPIO / peripheral function |
| 腳位 25 | PB4 — GPIO / peripheral function |
| 腳位 26 | PB5 — GPIO / peripheral function |
| 腳位 27 | PB6 — GPIO / peripheral function |
| 腳位 28 | PB7 — GPIO / peripheral function |
| 腳位 29 | PB8 — GPIO / peripheral function |
| 腳位 30 | PB9 — GPIO / peripheral function |
| 腳位 31 | PB10 — GPIO / peripheral function |
| 腳位 32 | PB11 — GPIO / peripheral function |
| 腳位 33 | VDDCORE — Core supply voltage (1.2 V typical) |
| 腳位 34 | PB12 — GPIO / peripheral function |
| 腳位 35 | PB13 — GPIO / peripheral function |
| 腳位 36 | PB14 — GPIO / peripheral function |
| 腳位 37 | GND — Ground |
| 腳位 38 | PC0 — GPIO / peripheral function |
| 腳位 39 | PC1 — GPIO / peripheral function |
| 腳位 40 | PC2 — GPIO / peripheral function |
| 腳位 41 | PC3 — GPIO / peripheral function |
| 腳位 42 | PC4 — GPIO / peripheral function |
| 腳位 43 | PC5 — GPIO / peripheral function |
| 腳位 44 | PC6 — GPIO / peripheral function |
| 腳位 45 | PC7 — GPIO / peripheral function |
| 腳位 46 | VDDIO — I/O supply voltage |
| 腳位 47 | PC8 — GPIO / peripheral function |
| 腳位 48 | PC9 — GPIO / peripheral function |
| 腳位 49 | PC10 — GPIO / peripheral function |
| 腳位 50 | PC11 — GPIO / peripheral function |
| 腳位 51 | PC12 — GPIO / peripheral function |
| 腳位 52 | PC13 — GPIO / peripheral function |
| 腳位 53 | PC14 — GPIO / peripheral function |
| 腳位 54 | PC15 — GPIO / peripheral function |
| 腳位 55 | GND — Ground |
| 腳位 56 | PD0 — GPIO / peripheral function |
| 腳位 57 | PD1 — GPIO / peripheral function |
| 腳位 58 | PD2 — GPIO / peripheral function |
| 腳位 59 | PD3 — GPIO / peripheral function |
| 腳位 60 | PD4 — GPIO / peripheral function |
| 腳位 61 | PD5 — GPIO / peripheral function |
| 腳位 62 | PD6 — GPIO / peripheral function |
| 腳位 63 | PD7 — GPIO / peripheral function |
| 腳位 64 | VDDIO — I/O supply voltage |
典型應用
ATSAMG55J19A-MU 適用於 6 應用s: USB Audio Headset, Industrial Sensor Hub, Bluetooth Audio Dongle, IoT Edge Node with USB Diagnostics, USB Headphones and Headsets, Low-Power Consumer Audio Product.
USB Audio Headset
The ATSAMG55J19A-MU integrates a USB 2.0 Full-Speed device interface with on-chip PHY plus dual I2S/TDM audio interfaces, making it an ideal MCU for USB digital audio headsets and headphones. The 120 MHz Cortex-M4F with FPU runs USB audio class firmware and applies real-time DSP effects (EQ, compressor, noise gate) without taxing CPU headroom. Up to 176 KB SRAM holds USB ping-pong buffers plus audio frame buffers. Designers route I2S to an external codec (e.g., SSS1623 or PCM5102A) and use 32-pin GPIO for buttons/LEDs. Total BOM drops versus a discrete USB audio controller plus DSP plus MCU.
推薦
Industrial Sensor Hub
With 100 uA/MHz active current and below 7 uA in deep sleep with SRAM retention, the ATSAMG55J19A-MU fits battery-powered industrial sensor hubs aggregating Modbus, I2C, SPI, and analog sensor data. The Cortex-M4F executes floating-point FFT and sensor-fusion math directly, while 512 KB Flash accommodates over-the-air (OTA) dual-image bootloaders. The 64-QFN exposes 5 UART channels for multi-protocol bridging. Wake-up in 3 us from deep sleep enables aggressive duty-cycling for multi-year coin-cell deployments.
推薦
Bluetooth Audio Dongle
Used as the USB host and audio routing MCU in a USB-to-Bluetooth audio dongle, the ATSAMG55J19A-MU manages USB enumeration, SBC/AAC encode, and forwards PCM to a co-processor over I2S. The Cortex-M4F handles USB host stack plus encoding without external DSP, and the integrated FPU accelerates audio codec math. Up to 176 KB SRAM is sufficient for USB + audio buffering. Power consumption stays low enough for bus-powered dongle operation from a single 5 V USB rail.
推薦
IoT Edge Node with USB Diagnostics
The ATSAMG55J19A-MU's USB 2.0 FS device interface makes it well suited to industrial IoT edge nodes that expose a USB diagnostic port for firmware updates, log capture, and field configuration. The 120 MHz Cortex-M4F runs TCP/IP stacks or MQTT-SN over UART-to-modem, while USB is reserved for service access. The QFN package and picoPower consumption enable sealed IP65 enclosures with single-cell Li-ion battery support. Real-time clock with calendar aids timestamping of field data.
推薦
USB Headphones and Headsets
In USB stereo headphones the ATSAMG55J19A-MU implements USB isochronous endpoints, sample-rate conversion, and digital volume control. The I2S bus feeds an external DAC that drives the headphone amplifier. Cortex-M4F DSP handles parametric EQ, limiter, and bass-boost algorithms without overloading the USB isochronous budget. Up to 176 KB SRAM hosts USB isochronous ping-pong buffers and audio frame processing buffers simultaneously. Industrial temp range suits consumer and prosumer audio products.
推薦
Low-Power Consumer Audio Product
Battery-powered speakers, dictation devices, and voice memo recorders benefit from the ATSAMG55J19A-MU's picoPower consumption profile. Active current of 100 uA/MHz plus deep sleep below 7 uA with full SRAM retention enables weeks of standby on a single Li-ion cell. The Cortex-M4F at 120 MHz executes MP3/WAV decode or simple voice-trigger wake-word detection. USB charging and I2S playback share a single MCU, eliminating an external PMIC in many designs.
推薦
推薦產品摘要
工程參考資料，適用於 ATSAMG55J19A-MU — 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 | ATSAMG55J19A-MUT | ATSAMG55J19B-MU | ATSAMG55J19B-MUT | ATSAMG55J19A-AU |
|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 64-QFN (7.5x7.5 mm) | 64-QFN (7.5x7.5 mm) - same | 64-QFN (7.5x7.5 mm) - same | 64-QFN (7.5x7.5 mm) - same | 64-LQFP (different footprint) |
| Core | ARM Cortex-M4F @ 120 MHz | ARM Cortex-M4F @ 120 MHz | ARM Cortex-M4F @ 120 MHz | ARM Cortex-M4F @ 120 MHz | ARM Cortex-M4F @ 120 MHz |
| Flash | 512 KB | 512 KB | 512 KB | 512 KB | 512 KB |
| SRAM | 176 KB | 176 KB | 176 KB | 176 KB | 176 KB |
| USB | USB 2.0 FS + PHY | USB 2.0 FS + PHY | USB 2.0 FS + PHY | USB 2.0 FS + PHY | USB 2.0 FS + PHY |
| I2S / TDM | 2 instances | 2 instances | 2 instances | 2 instances | 2 instances |
| Silicon Revision | G55 Rev A | G55 Rev A | G55 Rev B (errata-fixed) | G55 Rev B (errata-fixed) | G55 Rev A |
| Active Current | 100 uA/MHz | 100 uA/MHz | 100 uA/MHz | 100 uA/MHz | 100 uA/MHz |
主要差異化特點
- Integrated USB 2.0 Full-Speed PHY eliminates external PHY chip (對比Generic Cortex-M4 MCU (e.g., STM32F401 without USB FS))
- Dual I2S/TDM interfaces for multi-channel audio (對比Single I2S interface (typical Cortex-M4 MCU))
- picoPower technology: 100 uA/MHz active, <7 uA deep sleep (對比Higher-power Cortex-M4 alternatives (e.g., STM32F4 at ~250 uA/MHz))
設計說明
Estimated: at 120 MHz CPU active, VDDIN=3.3 V, the SAM G55 draws ~12 mA core current plus peripheral current. Add a 100 nF X7R ceramic bypass capacitor directly at each VDDIO pin and a 4.7 uF X5R bulk capacitor at the VDDIN/VDDCORE regulator output. Place ceramics within 2 mm of the supply pin traces. The integrated LDO for VDDCORE typically requires 1 uF at its output for stable regulation; consult the full datasheet for the recommended BOM.
The 64-QFN (7.5x7.5 mm) exposed pad (EP) is the thermal dissipation path and MUST be soldered to a continuous ground-plane land of at least 1:1 ratio to the EP. Use an array of thermal vias (0.3 mm drill, 0.5 mm pitch) under the EP to stitch inner ground layers. Without proper EP soldering, junction temperature rises 20-30 C above ambient at full CPU load, potentially triggering thermal shutdown.
Microchip recommends Revision B (ATSAMG55J19B) for all new designs because Revision A silicon has published errata affecting USB suspend/resume and I2S underflow handling. If you are maintaining an existing ATSAMG55J19A-MU design, review the silicon errata document before migrating firmware. The boot mode select (BMS) pin must be sampled correctly at reset for the part to enter bootloader mode; use a 100 kOhm pull-down on BMS for production.
Place the 12 MHz external crystal (or HSE oscillator) within 5 mm of the XIN/XOUT pins with symmetrical traces and a guard ground ring. The USB DP/DM traces must be routed as a 90-ohm differential pair with length matching within 2 mm, and should not cross any other signal traces. Keep the USB PHY analog ground island isolated from digital switching ground and stitch them only at the EP ground plane.
合規資訊
RoHS and lead-free per Microchip product page; AEC-Q100 not applicable (industrial-grade MCU, not automotive qualified).
