ATSAMG55J19A-AU - 120MHz Cortex-M4 MCU 512KB Flash | Microchip
MPN: ATSAMG55J19A-AU ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $5.74 | $5.74 |
| 10 | $5.31 | $53.10 |
| 100 | $4.87 | $487.00 |
| 500 | $4.42 | $2,210.00 |
| 1,000 | $3.99 | $3,990.00 |
ATSAMG55J19A-AU Overview
An ARM Cortex-M4 microcontroller is a 32-bit RISC processor core with an integrated single-precision floating-point unit (FPU), DSP extensions, and a nested vectored interrupt controller. It belongs to the hierarchy: Cortex-M4 -> ARM Cortex-M family -> 32-bit microcontroller (MCU) -> embedded processor -> semiconductor IC. The SAM G55 family specifically targets low-power audio and HMI applications through picoPower technology, integrating a high-performance DSP engine with energy-efficient peripherals suitable for always-on battery-powered devices.
Key features include 512KB embedded Flash for program storage, 160KB SRAM (including 16KB backup SRAM with retention in deep sleep), I2S digital audio interface with sample-rate converter, USB 2.0 Full-Speed device/host, an external bus interface for memory expansion, and an integrated FPU that accelerates floating-point math. The device operates from 1.62V to 3.6V supply, supports -40C to +85C industrial temperature range, and includes multiple low-power modes including deep sleep at less than 7 uA with SRAM retention, waking within 3 us to active execution.
Architecturally, the SAM G55 uses a single-cycle multiplier, hardware divide, and DSP extensions to deliver 1.25 DMIPS/MHz and 1.61 CoreMark/MHz throughput at 120MHz. The Cortex-M4 core is paired with a multi-layer bus matrix and tightly-coupled SRAM, eliminating wait states for most code execution. The audio-grade peripherals include a dedicated I2S controller with PDM and TDM support, enabling direct interfacing with digital MEMS microphones and audio DACs without external glue logic.
Typical applications include Bluetooth/wired audio headsets, industrial HMI panels with touch and display, USB audio devices, smart-home voice front-ends, and portable instrumentation. The combination of FPU-accelerated DSP, low-power audio peripherals, and high-density memory makes it particularly well-suited for audio processing, sensor fusion, and battery-powered edge-compute tasks.
Designers should note that Revision A (this part) is functionally complete but Microchip has transitioned new designs to Revision B ATSAMG55J19B, which provides silicon-level errata fixes; pin-for-pin compatibility between A and B revisions is preserved, so existing PCB layouts do not need to be changed when migrating. Verify long-term availability with your distributor before committing to Revision A in new designs.
This page synthesizes distributor pricing, drop-in cross-reference data, and practical design notes that go beyond the manufacturer datasheet to help engineers select, source, and design with the ATSAMG55J19A-AU efficiently.
Drop-in alternatives for ATSAMG55J19A-AU — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Variants in this series
Same-series models that are drop-in compatible with ATSAMG55J19A-AU (same form factor and footprint) — differing in Core Architecture, ADC, Communication Peripherals, Package, Mounting Type.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
ATSAMG55J19B-AU
✅ Drop-In📋 Reference alternative (not in catalog)
ATSAMG55J19B-AUT
✅ Drop-In✓ In Stock
$5.42 / Unit
View Datasheet →ATSAMG55J19A-MU
✅ Drop-In ⚠️ 参数待验证✓ In Stock
$5.42 / Unit
View Datasheet →ATSAMG53N19A-AU
✅ Drop-In ⚠️ 参数待验证✓ In Stock
$1.05 / Unit
View Datasheet →ATSAMG55J19A-MUT
✅ Drop-In✓ In Stock
$4.58 / Unit
View Datasheet →ATSAMG55J19A-AU Maximum Ratings & Electrical Characteristics
| Core Architecture | ARM Cortex-M4 with FPU |
| Core Clock Speed (max) | 120 MHz |
| Instruction Set | 32-bit RISC + DSP extensions + FPU (single-precision) |
| Program Flash Memory | 512 KB (512K x 8) |
| SRAM (Total) | 160 KB |
| Backup SRAM with Retention | 16 KB (retained in deep sleep) |
| Supply Voltage (VDDIO/VDDCORE) | 1.62 V to 3.6 V |
| Operating Temperature | -40 C to +85 C (industrial) |
| Package | 64-LQFP (10x10 mm) |
| Audio Interface | I2S with PDM/TDM and sample-rate converter |
| USB | USB 2.0 Full-Speed device/host |
| ADC | 12-bit SAR |
| Communication Peripherals | USART/UART, SPI, TWI (I2C), I2S, HS USB |
| External Bus Interface (EBI) | Yes (for SRAM/SDRAM/NOR Flash expansion) |
| Active Power Consumption | Down to 100 uA/MHz |
| Deep Sleep Current | Below 7 uA with SRAM retention |
| Wake-up Time (deep sleep to first instruction) | Down to 3 us |
| Mounting Type | Surface Mount |
| RoHS Status | Compliant |
| Lifecycle / New Design Recommendation | Active (new designs: consider ATSAMG55J19B Revision B) |
ATSAMG55J19A-AU 64-lqfp (10x10 mm) Pin Configuration Guide
Pin configuration for ATSAMG55J19A-AU (64-lqfp (10x10 mm) package). This digital IC includes GPIO, communication interfaces (UART, SPI, I2C), and power pins. Refer to the manufacturer datasheet for alternate pin functions and configuration options. Essential for embedded system design and PCB layout.
No detailed pinout data available for ATSAMG55J19A-AU.
Refer to the datasheet for full pin configuration.
Typical Applications
ATSAMG55J19A-AU is suitable for 6 applications: Bluetooth Audio Headsets, Industrial HMI Panels, USB Audio Peripherals, Smart Home Voice Front-Ends, Portable Test & Measurement, Sensor Fusion Edge Nodes.
Bluetooth Audio Headsets
The ATSAMG55J19A-AU's Cortex-M4F with hardware FPU accelerates SBC, AAC, and proprietary audio codecs while drawing only 100 uA/MHz in active mode. Its integrated I2S controller with PDM support connects directly to digital MEMS microphones and audio DACs, eliminating external audio CODEC ICs. The deep-sleep current below 7 uA with 16KB SRAM retention enables always-on voice wake detection on coin-cell or Li-Ion power, while the 3 us wake-up latency keeps button-press response imperceptible. The USB Full-Speed controller also supports charging-port detection. Together these features target Bluetooth/wired headsets where BOM integration, low power, and DSP throughput directly differentiate the end product.
Recommended
Industrial HMI Panels
The ATSAMG55J19A-AU's 512KB Flash and 160KB SRAM are ample for industrial HMI firmware stacks with LVGL or emWin graphics, while the Cortex-M4F executes touch-input and display-refresh tasks with single-precision math for slider/scale interpolation. The 64-LQFP package provides robust industrial-environment mechanical stability for through-hole-friendly mounting where vibration tolerance is required, and the -40C to +85C industrial temperature range covers factory-floor enclosures. USB Full-Speed enables firmware updates and HID touch interfaces, while the EBI can expand to external PSRAM for larger framebuffers. The picoPower modes allow battery-backed HMI panels to retain settings across power cycles.
Recommended
USB Audio Peripherals
The ATSAMG55J19A-AU's on-chip USB 2.0 Full-Speed device/host controller with integrated transceiver allows direct USB audio class (UAC1.0) implementation, eliminating external USB PHY chips and reducing BOM. The Cortex-M4F executes asynchronous sample-rate conversion, mixers, and DSP effects (EQ, compressor, reverb) while the I2S peripheral streams to an external audio DAC. USB Full-Speed 12Mbps is sufficient for stereo 48kHz/24-bit audio and mono 96kHz paths. USB suspend/resume states map cleanly to the picoPower deep-sleep modes, allowing bus-powered peripherals to meet USB-IF suspend-current budgets without external power gating.
Recommended
Smart Home Voice Front-Ends
The ATSAMG55J19A-AU's I2S controller with PDM support can directly sample 2-4 digital MEMS microphones for beamforming and noise suppression. The Cortex-M4F accelerates front-end DSP like AEC (acoustic echo cancellation) and NS (noise suppression) at low latency, while the FPU handles floating-point filter coefficients without integer-overflow artifacts. Deep-sleep below 7 uA with 16KB retention supports always-on voice-wake designs that only wake the main processor on keyword detection. The compact 64-LQFP and minimal external component count (no external PHY, no external audio CODEC) help fit voice-front-end PCBs into wall-switch or thermostat form factors.
Recommended
Portable Test & Measurement
The ATSAMG55J19A-AU delivers 120MHz Cortex-M4F throughput in a compact 64-LQFP, suitable for handheld multimeters, oscilloscope probes, and data loggers that need DSP processing of sensor signals on the fly. The 12-bit SAR ADC samples at up to 1Msps, sufficient for vibration, audio-band, and current-sensing measurements, while the FPU runs RMS, FFT, and digital-filter math with single-cycle throughput. USB Full-Speed enables data download to a host PC, and the deep-sleep modes stretch battery life to weeks. The 1.62-3.6V supply accepts Li-Ion cells directly, and the industrial temperature range supports outdoor measurement environments.
Recommended
Sensor Fusion Edge Nodes
The ATSAMG55J19A-AU's Cortex-M4F runs sensor fusion algorithms like Madgwick or Mahony quaternion filters at low latency, fusing 6/9-axis IMU data and producing orientation estimates for robotics, drones, and wearables. The 160KB SRAM holds sensor buffers and intermediate filter state without external memory, while the 512KB Flash fits BLE stacks, RTOS, and application firmware. Multiple SPI/I2C instances allow direct connection to IMUs, magnetometers, and pressure sensors. Deep-sleep modes below 7 uA suit battery-powered wearables, and USB Full-Speed supports wired debug and firmware update over the same connector used for charging.
Recommended
Recommended Products Summary
Engineering reference data for ATSAMG55J19A-AU — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | ATSAMG55J19B-AU | ATSAMG55J19B-AUT | ATSAMG55J19A-MUT | ATSAMG53N19A-AU | ATSAMG55J19A-MU |
|---|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 64-LQFP (10x10) | 64-LQFP (10x10) - same | 64-LQFP (10x10) - same | 64-LQFP (10x10) - same | 64-LQFP - same family | 64-LQFP - same footprint |
| Core | ARM Cortex-M4F (with FPU) | ARM Cortex-M4F | ARM Cortex-M4F | ARM Cortex-M4F | ARM Cortex-M4 (no FPU) | ARM Cortex-M4F |
| Max Clock | 120 MHz | 120 MHz | 120 MHz | 120 MHz | 120 MHz | 120 MHz |
| Flash | 512 KB | 512 KB | 512 KB | 512 KB | 512 KB | 512 KB |
| SRAM | 160 KB | 160 KB | 160 KB | 160 KB | 96 KB | 160 KB |
| Supply Voltage | 1.62 V to 3.6 V | 1.62 V to 3.6 V | 1.62 V to 3.6 V | 1.62 V to 3.6 V | 1.62 V to 3.6 V | 1.62 V to 3.6 V |
| USB | USB 2.0 Full-Speed device/host | USB 2.0 Full-Speed | USB 2.0 Full-Speed | USB 2.0 Full-Speed | USB 2.0 Full-Speed | USB 2.0 Full-Speed |
| Audio Interface | I2S with PDM/TDM | I2S with PDM/TDM | I2S with PDM/TDM | I2S with PDM/TDM | I2S (no PDM) | I2S with PDM/TDM |
| Operating Temperature | -40 C to +85 C | -40 C to +85 C | -40 C to +85 C | -40 C to +85 C | -40 C to +85 C | -40 C to +85 C |
Key Differentiators
- Higher SRAM than ATSAMG53N19A-AU (vs ATSAMG53N19A-AU)
- Revision B with silicon errata fixes (vs ATSAMG55J19B-AU)
- FPU on chip (vs ATSAMG53N19A-AU)
Design Notes
Decouple VDDIO and VDDCORE with 100nF ceramic capacitors placed within 5mm of each supply pin, plus a 4.7uF bulk capacitor on the main VDDIO rail. The SAM G55 integrates a 1.2V core LDO from VDDIO; when running at 120MHz with all peripherals active, expect up to 60mA peak current on VDDIO, so size the source regulator accordingly. Place a ferrite bead or small ferrite between VDDIO and the analog AVVDD rail if the ADC is sampling high-impedance sensors to avoid digital-noise coupling.
Route the 32.768kHz crystal traces within 5mm of the XIN32/XOUT32 pins, guard them with a ground ring, and keep them short and matched in length. For the high-speed 12MHz main crystal, place load capacitors within 2mm of XIN/XOUT. The USB D+/D- differential pair should be routed 90-ohm differential impedance with length-matched traces and a common-mode choke near the connector for ESD/burst protection. The SWDIO/SWCLK debug lines should be routed with adjacent ground pour to avoid noise-induced debug failures in production.
Estimated: at 120MHz active, 3.3V VDDIO, and full peripheral clock tree, the SAM G55 draws approximately 60-80mA peak. If your 3.3V regulator is sized for 50mA, voltage droop will trigger brown-out resets under DSP load. Verify regulator current rating with margin. Do not enable the I2S peripheral without first configuring its clock source in PMC - the SAM G55 I2S clock root must be enabled before peripheral enable, otherwise peripheral access faults occur. For deep-sleep wake-up designs, the 16KB backup SRAM is the only SRAM retained across deep sleep; do not place wake-time state in the main 144KB SRAM region or it will be lost.
Compliance Information
RoHS and REACH compliant per Microchip product page. Not AEC-Q100 qualified - this part targets industrial/consumer audio and HMI applications, not automotive. For automotive designs use AEC-Q100-qualified SAM V71/V70 or SAMA5D2 series instead.
