ATSAM4SD32BA-MU - 120MHz Cortex-M4 MCU 2MB Flash | Microchip
MPN: ATSAM4SD32BA-MU β Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $15.42 | $15.42 |
| 10 | $13.86 | $138.60 |
| 100 | $12.31 | $1,231.00 |
| 500 | $10.74 | $5,370.00 |
| 1,000 | $9.18 | $9,180.00 |
| 3,000 | $7.85 | $23,550.00 |
ATSAM4SD32BA-MU Overview
An ARM Cortex-M4 microcontroller is a 32-bit processor core based on the ARMv7-M architecture with single-cycle multiply-accumulate and optional single-precision floating-point hardware. It occupies the mid-performance tier of the Cortex-M family (between Cortex-M0+ and Cortex-M7) and is paired in the SAM4S line with peripheral subsystems such as 12-bit ADC, high-speed USB, CAN, EMAC, and flexible timers, making it a common drop-in choice for designers migrating from the Cortex-M3-based SAM3S series.
The SAM4S family balances performance density and power efficiency. Key features include a multi-layer bus matrix with distributed SRAM for parallel DMA transfers, an integrated 12-bit 1 MSPS analog-to-digital converter with up to 24 channels, a high-speed USB 2.0 Full-Speed device/host port, two CAN 2.0A/B controllers, a 10/100 Ethernet MAC (EMAC) for networked designs, and an external bus interface (EBI) that supports SRAM, SDRAM, and NAND Flash expansion. Peripherals communicate with the core through two separate peripheral bridges plus a peripheral DMA controller (PDC) for low-CPU-overhead data movement.
Architecture-wise, the ATSAM4SD32BA-MU uses a Harvard-bus layout with separate code and data buses, a tightly-coupled SRAM block that can be battery-backed for RTC retention, and a flexible power-saving controller with Idle, Sleep, and Backup modes. The 2 KB instruction cache accelerates Flash-resident code execution and reduces active power, while the multi-layer AHB matrix lets the CPU, DMA, and Ethernet MAC transfer data concurrently without starving one another.
Typical applications include industrial PLCs, factory-automation controllers, point-of-sale terminals, smart energy metering, building-automation gateways, USB peripherals, CAN-node motor-control boards, and HVAC controllers. Its pin-to-pin compatibility with SAM3N, SAM3S, and SAM7S legacy 64-pin and 100-pin packages simplifies upgrades from older Atmel designs.
When designing with this device, ensure the four power domains (VDDIN, VDDFLASH, VDDIO, VDDUTMI) are correctly sequenced and decoupled with 100 nF X7R ceramics adjacent to each pin. The supply voltage is 1.62 V to 3.6 V, and the integrated voltage regulator requires a 4.7 Β΅F bulk capacitor on VDDCORE.
This page synthesizes distributor pricing, drop-in alternatives, and application-level guidance not found in the standalone manufacturer datasheet.
Drop-in alternatives for ATSAM4SD32BA-MU β 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 ATSAM4SD32BA-MU (same form factor and footprint) β differing in Package, Flash Memory, Operating Temperature, ADC, CAN.
Quick Comparison Tool β Select alternative parts for side-by-side comparison:
ATSAM4SD32BA-MUR
β Drop-Inπ Reference alternative (not in catalog)
ATSAM4SD32BA-CFU
β Drop-Inπ Reference alternative (not in catalog)
ATSAM4SD32BA-AU
β Drop-Inβ In Stock
$9.45 / Unit
View Datasheet βATSAM4SD32BA-MU Maximum Ratings & Electrical Characteristics
| Core | ARM Cortex-M4 with FPU and MPU |
| Maximum CPU Clock | 120 MHz |
| Instruction Cache | 2 KB |
| Flash Memory | 2 MB (2 M x 8) |
| SRAM | 160 KB |
| Instruction Set | Thumb-2, DSP extensions |
| Package | 64-pin QFN (9x9 mm) |
| Supply Voltage (VDDCORE) | 1.2 V (internal regulator) |
| I/O Supply Voltage (VDDIO) | 1.62 V to 3.6 V |
| Operating Temperature | -40 Β°C to +85 Β°C (industrial) |
| ADC | 12-bit, up to 24 channels, 1 MSPS |
| USB | USB 2.0 Full-Speed Device/Host |
| CAN | 2 x CAN 2.0A/B controllers |
| Ethernet | 10/100 EMAC (external PHY required) |
| Timers | Multiple TC, RTT, RTC, PWM |
| External Bus Interface (EBI) | Yes (SRAM, SDRAM, NAND support) |
| RoHS Status | Compliant |
| MSL Level | 3 (168 hours) |
ATSAM4SD32BA-MU Pin Configuration
| Pin 1 | PA0 β General-purpose I/O / peripheral function (see datasheet) |
| Pin 2 | PA1 β General-purpose I/O / peripheral function |
| Pin 3 | PA2 β General-purpose I/O / peripheral function |
| Pin 4 | PA3 β General-purpose I/O / peripheral function |
| Pin 5 | PA4 β General-purpose I/O / peripheral function |
| Pin 6 | PA5 β General-purpose I/O / peripheral function |
| Pin 7 | PA6 β General-purpose I/O / peripheral function |
| Pin 8 | PA7 β General-purpose I/O / peripheral function |
| Pin 9 | VDDOUT β Voltage regulator output (1.2 V core supply) |
| Pin 10 | GND β Ground |
| Pin 11 | PA8 β General-purpose I/O / peripheral function |
| Pin 12 | PA9 β General-purpose I/O / peripheral function |
| Pin 13 | PA10 β General-purpose I/O / peripheral function |
| Pin 14 | PA11 β General-purpose I/O / peripheral function |
| Pin 15 | PA12 β General-purpose I/O / peripheral function |
| Pin 16 | PA13 β General-purpose I/O / peripheral function |
| Pin 17 | PA14 β General-purpose I/O / peripheral function |
| Pin 18 | PA15 β General-purpose I/O / peripheral function |
| Pin 19 | GND β Ground |
| Pin 20 | PB0 β General-purpose I/O / peripheral function |
| Pin 21 | PB1 β General-purpose I/O / peripheral function |
| Pin 22 | PB2 β General-purpose I/O / peripheral function |
| Pin 23 | PB3 β General-purpose I/O / peripheral function |
| Pin 24 | PB4 β General-purpose I/O / peripheral function |
| Pin 25 | PB5 β General-purpose I/O / peripheral function |
| Pin 26 | PB6 β General-purpose I/O / peripheral function |
| Pin 27 | PB7 β General-purpose I/O / peripheral function |
| Pin 28 | PB8 β General-purpose I/O / peripheral function |
| Pin 29 | PB9 β General-purpose I/O / peripheral function |
| Pin 30 | PB10 β General-purpose I/O / peripheral function |
| Pin 31 | PB11 β General-purpose I/O / peripheral function |
| Pin 32 | PB12 β General-purpose I/O / peripheral function |
| Pin 33 | PB13 β General-purpose I/O / peripheral function |
| Pin 34 | PB14 β General-purpose I/O / peripheral function |
| Pin 35 | VDDIN β Voltage regulator input (3.3 V typical) |
| Pin 36 | VDDOUT β Voltage regulator output (1.2 V core supply) |
| Pin 37 | VDDIO β I/O supply voltage (1.62 V to 3.6 V) |
| Pin 38 | GND β Ground |
| Pin 39 | PC0 β General-purpose I/O / peripheral function |
| Pin 40 | PC1 β General-purpose I/O / peripheral function |
| Pin 41 | PC2 β General-purpose I/O / peripheral function |
| Pin 42 | PC3 β General-purpose I/O / peripheral function |
| Pin 43 | PC4 β General-purpose I/O / peripheral function |
| Pin 44 | PC5 β General-purpose I/O / peripheral function |
| Pin 45 | PC6 β General-purpose I/O / peripheral function |
| Pin 46 | PC7 β General-purpose I/O / peripheral function |
| Pin 47 | PC8 β General-purpose I/O / peripheral function |
| Pin 48 | PC9 β General-purpose I/O / peripheral function |
| Pin 49 | PC10 β General-purpose I/O / peripheral function |
| Pin 50 | PC11 β General-purpose I/O / peripheral function |
| Pin 51 | PC12 β General-purpose I/O / peripheral function |
| Pin 52 | PC13 β General-purpose I/O / peripheral function |
| Pin 53 | PC14 β General-purpose I/O / peripheral function |
| Pin 54 | PC15 β General-purpose I/O / peripheral function |
| Pin 55 | PD0 β General-purpose I/O / peripheral function |
| Pin 56 | PD1 β General-purpose I/O / peripheral function |
| Pin 57 | PD2 β General-purpose I/O / peripheral function |
| Pin 58 | PD3 β General-purpose I/O / peripheral function |
| Pin 59 | PD4 β General-purpose I/O / peripheral function |
| Pin 60 | PD5 β General-purpose I/O / peripheral function |
| Pin 61 | PD6 β General-purpose I/O / peripheral function |
| Pin 62 | PD7 β General-purpose I/O / peripheral function |
| Pin 63 | NRST β Reset input (active-low) |
| Pin 64 | GND β Ground (exposed pad connected to GND) |
Typical Applications
ATSAM4SD32BA-MU is suitable for 6 applications: Industrial PLC and Factory Automation Controller, USB Peripherals and Human Interface Devices, Smart Energy Metering and Building Automation Gateways, Point-of-Sale Terminals and Secure Payment Devices, Industrial CAN-Node Motor Control Boards, HVAC Controllers and Climate Sensors.
Industrial PLC and Factory Automation Controller
The ATSAM4SD32BA-MU is well suited to industrial PLC and factory-automation controller designs because its 120 MHz Cortex-M4 core, 2 MB Flash, and 160 KB SRAM give the deterministic headroom needed for ladder-logic and motion-control loops. The integrated dual CAN 2.0A/B controllers let the same board sit on a CANopen or DeviceNet segment while the 10/100 Ethernet MAC uplinks to a SCADA host without an external bridge IC. The 1.62 V to 3.6 V I/O domain interfaces directly to 3.3 V industrial sensors and the on-chip 12-bit 1 MSPS ADC handles up to 24 analog inputs at adequate resolution for process-variable monitoring. The 64-pin QFN footprint keeps the controller small enough for DIN-rail mounted I/O modules while the industrial -40 to +85 Β°C operating range supports unheated control cabinets.
Recommended
USB Peripherals and Human Interface Devices
Designers of USB peripherals such as industrial barcode scanners, custom keyboards, and human-interface devices benefit from the ATSAM4SD32BA-MU's integrated USB 2.0 Full-Speed device/host port with on-chip transceiver, which eliminates the need for an external PHY. The 2 MB Flash stores USB HID class descriptors, multi-language UI strings, and OTA bootloader images, while the 160 KB SRAM comfortably buffers HID reports at high polling rates. The Cortex-M4 DSP extensions accelerate any signal-processing workloads such as barcode image pre-processing or audio feedback generation. The 64-pin QFN 9x9 mm footprint fits inside compact USB dongle form factors, and the 1.62 V to 3.6 V supply domain pairs cleanly with USB bus-powered designs that already regulate to 3.3 V.
Recommended
Smart Energy Metering and Building Automation Gateways
Smart energy meters and building-automation gateways leverage the ATSAM4SD32BA-MU's 2 MB Flash for storing metering firmware, calibration tables, and trend logs without external memory. The on-chip 12-bit ADC plus the Cortex-M4 DSP extensions perform real-time RMS current/voltage computation and harmonic analysis up to the 21st harmonic, sufficient for class-1 metering accuracy. The dual CAN bus plus Ethernet MAC lets one board serve as a BACnet/Modbus-to-CAN bridge in HVAC and lighting systems, while the external bus interface (EBI) connects to SDRAM if design teams later add a local display. The industrial temperature grade and wide 1.62 V to 3.6 V input allow direct operation from rectified 24 VAC building-power rails.
Recommended
Point-of-Sale Terminals and Secure Payment Devices
Point-of-sale (POS) terminals and secure payment peripherals require deterministic response times, encrypted storage, and multiple connectivity interfaces - all delivered by the ATSAM4SD32BA-MU. The 2 MB Flash holds a full TLS stack, payment applet binaries, and update partitions, while the Cortex-M4 hardware AES via software libraries accelerates EMV transaction handshakes. The integrated Ethernet MAC provides the wired IP backhaul, and the USB 2.0 Full-Speed ports support PIN-pad and contactless-reader peripherals. The 12-bit ADC reads battery monitoring, and the backup SRAM domain retains RTC plus tamper flags across power events. The 64-pin QFN package enables slim card-reader enclosures, and the 1.62 V to 3.6 V supply domain supports single-cell Li-ion or USB-C powered operation.
Recommended
Industrial CAN-Node Motor Control Boards
Field-oriented control (FOC) and trapezoidal commutation for BLDC and PMSM motors run efficiently on the ATSAM4SD32BA-MU because the Cortex-M4 core delivers single-cycle MAC and SIMD instructions that are mandatory for fast Park/Clarke transforms. The dual CAN 2.0A/B controllers let the same board serve as a CANopen DS402 slave on a multi-axis motion network, while the PWM timers drive three-phase inverter bridges directly. The 12-bit ADC synchronously samples phase currents at the PWM period to keep torque ripple low. The 2 MB Flash stores full motor parameters and field-weakening tables, and the 64-pin QFN footprint suits small integrated motor-drive PCBs. The 1.62 V to 3.6 V I/O range interfaces with 3.3 V gate drivers without level shifters.
Recommended
HVAC Controllers and Climate Sensors
HVAC controllers and climate sensor hubs combine several measurement interfaces that map directly onto the ATSAM4SD32BA-MU's peripheral set. The 12-bit 1 MSPS ADC samples thermistor, humidity-sensor, and pressure-sensor outputs simultaneously through its 24 channels. The dual CAN bus interfaces with the boiler-side or chiller-side control network, while Ethernet uplinks to a building-management system (BMS). The 2 MB Flash stores multiple HVAC control algorithms (PID, fuzzy, adaptive) and seasonal profile curves without external storage. The on-chip RTC with backup SRAM preserves schedule and set-point data across power cycles, and the 1.62 V to 3.6 V supply range allows direct operation from 24 VAC rectified supplies. The industrial -40 to +85 Β°C temperature grade handles unheated plant rooms and rooftop unit enclosures.
Recommended
Recommended Products Summary
Engineering reference data for ATSAM4SD32BA-MU β comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | ATSAM4SD32BA-MUR | ATSAM4SD32BA-CFU | ATSAM4SD16BA-MU |
|---|---|---|---|---|
| Package | 64-pin QFN (9x9 mm) | 64-pin QFN (9x9 mm) - same | 64-pin QFN (9x9 mm) - same | 64-pin QFN (9x9 mm) - same |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Core | ARM Cortex-M4 @ 120 MHz | ARM Cortex-M4 @ 120 MHz | ARM Cortex-M4 @ 120 MHz | ARM Cortex-M4 @ 120 MHz |
| Flash Memory | 2 MB | 2 MB | 2 MB | 1 MB |
| SRAM | 160 KB | 160 KB | 160 KB | 128 KB |
| USB | USB 2.0 Full-Speed Device/Host | USB 2.0 Full-Speed Device/Host | USB 2.0 Full-Speed Device/Host | USB 2.0 Full-Speed Device/Host |
| Ethernet MAC | 10/100 EMAC | 10/100 EMAC | 10/100 EMAC | 10/100 EMAC |
| CAN | 2 x CAN 2.0A/B | 2 x CAN 2.0A/B | 2 x CAN 2.0A/B | 2 x CAN 2.0A/B |
| Automotive Grade | No | Yes (AEC-Q100) | No | No |
| Operating Temperature | -40 Β°C to +85 Β°C | -40 Β°C to +85 Β°C (AEC-Q100) | -40 Β°C to +85 Β°C | -40 Β°C to +85 Β°C |
Key Differentiators
- Highest Flash density in 64-pin QFN SAM4S family (vs ATSAM4SD16BA-MU)
- Industrial operating range with automotive-grade sibling on same die (vs ATSAM4SD32BA-MUR)
- Pin-to-pin compatibility with SAM3N, SAM3S, SAM7S legacy 64-pin packages (vs ATSAM4N8AA-AU)
Design Notes
The ATSAM4SD32BA-MU integrates a 1.2 V core LDO that requires a 4.7 Β΅F X7R bulk capacitor on VDDOUT and a 100 nF X7R decoupling cap adjacent to each VDDIO/VDDIN pin. The four supply domains (VDDIN, VDDFLASH, VDDIO, VDDUTMI) must be brought up together; if USB is unused, tie VDDUTMI to VDDIO through a ferrite bead. Brown-out detection is enabled by default at 1.68 V (VDDIO) and 0.96 V (VDDOUT) - leave the default SUPC MR settings unless the system design requires custom thresholds.
Estimated: at 120 MHz with all peripherals active and 3.3 V VDDIO, the typical core consumption is approximately 30 mA (β100 mW). The 64-pin QFN has a junction-to-ambient thermal resistance (ΞΈJA) around 30 Β°C/W on a 4-layer JEDEC test board, giving a self-heating rise of ~3 Β°C - well within industrial limits. For sealed enclosures with no airflow, derate to 80% active duty cycle and add thermal vias under the exposed pad (EP) tied to a 25 x 25 mm inner copper pour.
Place the 32.768 kHz crystal within 5 mm of the XIN32/XOUT32 pins with a solid ground guard ring, and route the 12 MHz main crystal with symmetrical trace lengths to maintain duty cycle. Keep ADC reference and analog supply traces isolated from switching nodes by at least 3 trace widths. The Ethernet MAC requires a 50 MHz reference clock routed with 50 Ξ© characteristic impedance and length-matched within 2 mm to the external PHY. Use a 4-layer stack with a continuous ground plane beneath the QFN exposed pad, stitching vias every 5 mm around the periphery.
Do not leave the NRST pin floating - it requires a 10 kΞ© pull-up to VDDIO and a 100 nF capacitor to ground for proper reset timing. The JTAG/SWD pins (TCK, TMS, TDI, TDO, NRST) must not be left floating if the debug interface is unused; either enable the internal pull-ups in the WPMR/PMC settings or add external 47 kΞ© pull-ups to VDDIO. Always run the SAM-BA bootloader pre-flashed in Flash at 0x00400000 when designing field-upgradable firmware; the GPNVM bits must be configured correctly before locking the security bit.
Compliance Information
RoHS compliant per Microchip product page. AEC-Q100 grade available on the MUR sibling part. Halogen-free status not explicitly listed in the verified data.
