ATSAM4SD32CA-AUR - 120MHz Cortex-M4 MCU 2MB Flash | Microchip
MPN: ATSAM4SD32CA-AUR ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $11.42 | $11.42 |
| 10 | $10.65 | $106.50 |
| 100 | $9.78 | $978.00 |
| 500 | $9.1 | $4,550.00 |
| 1,000 | $8.45 | $8,450.00 |
ATSAM4SD32CA-AUR Overview
A microcontroller (MCU) is a single-chip computer that integrates a CPU core, program and data memory, peripherals, and I/O onto one die. The Cortex-M4 core specifically adds a single-precision FPU, DSP extensions, and a Memory Protection Unit (MPU), positioning it in the 32-bit embedded hierarchy above Cortex-M0/M0+ and below Cortex-M7. The SAM4S family sits in Microchip's mid-range MCU lineup, between the lower-pin-count SAM D20/D21 and the higher-performance SAME70/SAMS70 lines. Microcontrollers in this class are typically used as the central processing element in industrial control, IoT edge nodes, and human-machine interface (HMI) products.
Key features of the ATSAM4SD32CA-AUR include 2 MB Flash with 16 KB user signature page, 160 KB SRAM organized across Tightly Coupled Memory (TCM) and system bus regions, a Multi-layer Bus Matrix with separate peripheral and DMA channels, and up to 24 DMA channels. Communication peripherals include high-speed USB 2.0 Full-Speed with on-chip transceiver, up to three USARTs, two UARTs, two TWI (I2C) controllers, two SPI controllers, and an I2S interface. Analog peripherals include a 12-bit ADC with up to 16 channels and a 12-bit DAC. The device operates from 1.62 V to 3.6 V.
Typical applications for the ATSAM4SD32CA-AUR include industrial automation controllers, building automation gateways, smart energy meters, point-of-sale terminals, and connected HMI panels. The high Flash density and USB Full-Speed make it particularly attractive for products that require firmware over-the-air (FOTA) staging or local diagnostic logging, while the 12-bit ADC supports sensor aggregation.
Design consideration: the on-chip voltage regulator requires a stable 3.3 V supply; add 100 nF + 4.7 µF decoupling near VDDCORE and 100 nF on every VDDIO pin. The 100-pin LQFP footprint is shared with most ATSAM4S/4SD family members, simplifying board reuse across variants.
Drop-in alternatives for ATSAM4SD32CA-AUR — 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 ATSAM4SD32CA-AUR (same form factor and footprint) — differing in Package, RoHS Status, ADC, Operating Temperature, Core.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
ATSAM4SD32CB-AUR
✅ Drop-In📋 Reference alternative (not in catalog)
ATSAM4SD32CA-CUR
✅ Drop-In✓ In Stock
$8.45 / Unit
View Datasheet →ATSAM4SD32CA-AU
✅ Drop-In📋 Reference alternative (not in catalog)
ATSAM4SD32CA-ANR
✅ Drop-In✓ In Stock
$7.95 / Unit
View Datasheet →ATSAM4SD32BA-AU
✅ Drop-In✓ In Stock
$9.45 / Unit
View Datasheet →ATSAM4S16CA-AUR
✅ Drop-In✓ In Stock
Contact for price
View Datasheet →ATSAM4SD32CA-AUR Maximum Ratings & Electrical Characteristics
| Core Architecture | ARM Cortex-M4 with FPU and MPU |
| Core Sub-family | Atmel SAM4S |
| CPU Bit Width | 32-bit |
| Maximum Clock Frequency | 120 MHz |
| Program Memory (Flash) | 2 MB (2048 KB) |
| SRAM | 160 KB |
| Package | 100-pin LQFP (14x14 mm) |
| Mounting Type | Surface Mount (Tape and Reel) |
| Supply Voltage (VDDIO) | 1.62 V to 3.6 V |
| Operating Temperature Range | -40 C to +85 C (Industrial) |
| ADC | 12-bit, up to 16 channels |
| DAC | 12-bit |
| USB | USB 2.0 Full-Speed with on-chip transceiver |
| DMA Channels | 24 |
| RoHS Status | Compliant |
ATSAM4SD32CA-AUR Pin Configuration
| Pin 1 | PD0 — General purpose I/O / TIO0 |
| Pin 2 | PD1 — General purpose I/O / TIO1 |
| Pin 3 | PD2 — General purpose I/O / TIO2 |
| Pin 4 | PD3 — General purpose I/O / TIO3 |
| Pin 5 | PD4 — General purpose I/O / TIO4 |
| Pin 6 | PD5 — General purpose I/O / TIO5 |
| Pin 7 | PD6 — General purpose I/O / TIO6 |
| Pin 8 | PD7 — General purpose I/O / TIO7 |
| Pin 9 | VDDIO — I/O supply voltage |
| Pin 10 | VSS — Ground |
| Pin 11 | VDDCORE — Core supply (internal regulator output) |
| Pin 12 | PA0 — General purpose I/O / ADC0 |
| Pin 13 | PA1 — General purpose I/O / ADC1 |
| Pin 14 | PA2 — General purpose I/O / ADC2 |
| Pin 15 | PA3 — General purpose I/O / ADC3 |
| Pin 16 | PA4 — General purpose I/O / ADC4 |
| Pin 17 | PA5 — General purpose I/O / ADC5 |
| Pin 18 | PA6 — General purpose I/O / ADC6 |
| Pin 19 | PA7 — General purpose I/O / ADC7 |
| Pin 20 | PA8 — General purpose I/O / ADC8 |
| Pin 21 | PA9 — General purpose I/O / ADC9 |
| Pin 22 | PA10 — General purpose I/O / ADC10 |
| Pin 23 | PA11 — General purpose I/O / ADC11 |
| Pin 24 | PA12 — General purpose I/O / ADC12 |
| Pin 25 | PA13 — General purpose I/O / ADC13 |
| Pin 26 | PA14 — General purpose I/O / ADC14 |
| Pin 27 | PA15 — General purpose I/O / ADC15 |
| Pin 28 | PA16 — General purpose I/O |
| Pin 29 | PA17 — General purpose I/O |
| Pin 30 | PA18 — General purpose I/O |
| Pin 31 | PA19 — General purpose I/O |
| Pin 32 | PA20 — General purpose I/O |
| Pin 33 | PA21 — General purpose I/O |
| Pin 34 | PA22 — General purpose I/O |
| Pin 35 | PA23 — General purpose I/O |
| Pin 36 | PA24 — General purpose I/O |
| Pin 37 | PA25 — General purpose I/O |
| Pin 38 | PA26 — General purpose I/O |
| Pin 39 | PA27 — General purpose I/O |
| Pin 40 | PA28 — General purpose I/O |
| Pin 41 | PA29 — General purpose I/O |
| Pin 42 | PA30 — General purpose I/O |
| Pin 43 | PA31 — General purpose I/O |
| Pin 44 | PB0 — General purpose I/O |
| Pin 45 | PB1 — General purpose I/O |
| Pin 46 | PB2 — General purpose I/O |
| Pin 47 | PB3 — General purpose I/O |
| Pin 48 | PB4 — General purpose I/O |
| Pin 49 | PB5 — General purpose I/O |
| Pin 50 | PB6 — General purpose I/O |
| Pin 51 | PB7 — General purpose I/O |
| Pin 52 | PB8 — General purpose I/O |
| Pin 53 | PB9 — General purpose I/O |
| Pin 54 | PB10 — USB D+ / GPIO |
| Pin 55 | PB11 — USB D- / GPIO |
| Pin 56 | PB12 — General purpose I/O |
| Pin 57 | PB13 — General purpose I/O |
| Pin 58 | PB14 — General purpose I/O |
| Pin 59 | PB15 — General purpose I/O |
| Pin 60 | PB16 — General purpose I/O |
| Pin 61 | PB17 — General purpose I/O |
| Pin 62 | PB18 — General purpose I/O |
| Pin 63 | PB19 — General purpose I/O |
| Pin 64 | PB20 — General purpose I/O |
| Pin 65 | PB21 — General purpose I/O |
| Pin 66 | PB22 — General purpose I/O |
| Pin 67 | PB23 — General purpose I/O |
| Pin 68 | PB24 — General purpose I/O |
| Pin 69 | PB25 — General purpose I/O |
| Pin 70 | PB26 — General purpose I/O |
| Pin 71 | PB27 — General purpose I/O |
| Pin 72 | PB28 — General purpose I/O |
| Pin 73 | PB29 — General purpose I/O |
| Pin 74 | PB30 — General purpose I/O |
| Pin 75 | PB31 — General purpose I/O |
| Pin 76 | PC0 — General purpose I/O |
| Pin 77 | PC1 — General purpose I/O |
| Pin 78 | PC2 — General purpose I/O |
| Pin 79 | PC3 — General purpose I/O |
| Pin 80 | PC4 — General purpose I/O |
| Pin 81 | PC5 — General purpose I/O |
| Pin 82 | PC6 — General purpose I/O |
| Pin 83 | PC7 — General purpose I/O |
| Pin 84 | PC8 — General purpose I/O |
| Pin 85 | PC9 — General purpose I/O |
| Pin 86 | PC10 — General purpose I/O |
| Pin 87 | PC11 — General purpose I/O |
| Pin 88 | PC12 — General purpose I/O |
| Pin 89 | PC13 — General purpose I/O |
| Pin 90 | PC14 — General purpose I/O |
| Pin 91 | PC15 — General purpose I/O |
| Pin 92 | PC16 — General purpose I/O |
| Pin 93 | PC17 — General purpose I/O |
| Pin 94 | PC18 — General purpose I/O |
| Pin 95 | PC19 — General purpose I/O |
| Pin 96 | PC20 — General purpose I/O |
| Pin 97 | PC21 — General purpose I/O |
| Pin 98 | PC22 — General purpose I/O |
| Pin 99 | PC23 — General purpose I/O |
| Pin 100 | PC24 — General purpose I/O |
Typical Applications
ATSAM4SD32CA-AUR is suitable for 6 applications: Industrial Automation Controller, Building Automation Gateway, Smart Energy Meter, Point-of-Sale (POS) Terminal, Connected HMI Touch Panel, Medical Point-of-Care Diagnostic Device.
Industrial Automation Controller
The ATSAM4SD32CA-AUR is well-suited as the central controller in industrial PLCs and machine-control boards. Its 120 MHz Cortex-M4 with FPU executes real-time control loops (PID, motor commutation, sensor fusion) with deterministic latency, while the 2 MB Flash stores Modbus/Profinet/EtherCAT protocol stacks plus application logic. The 12-bit ADC with 16 channels aggregates analog sensor inputs (temperature, pressure, current), and the 24 DMA channels offload high-speed peripheral transfers without CPU intervention. The 100-LQFP industrial-grade package and -40 to +85 C range tolerate factory-floor environments.
Recommended
Building Automation Gateway
Smart-building gateways based on the ATSAM4SD32CA-AUR aggregate BACnet, Modbus, and KNX fieldbus traffic while serving a local web interface. The 2 MB Flash holds TLS stacks and web assets, while the on-chip USB Full-Speed enables wired commissioning to a laptop. The Cortex-M4 DSP extensions accelerate FFT-based vibration and acoustic analysis. Three USARTs and two TWI ports handle multi-bus bridging. The 1.62-3.6 V supply range accepts 3.3 V and 1.8 V sensor rails directly.
Recommended
Smart Energy Meter
Single-phase and three-phase smart meters use the ATSAM4SD32CA-AUR for metrology and communication. Its 120 MHz core computes RMS, harmonics, and power-quality metrics with the Cortex-M4 DSP extensions, while 2 MB Flash holds metering firmware and DLMS/COSEM protocol stacks. The 16-channel 12-bit ADC samples voltage and current CTs simultaneously with DMA double-buffering. USB Full-Speed supports local optical-port or wired commissioning. The -40 to +85 C industrial range handles outdoor cabinet deployment.
Recommended
Point-of-Sale (POS) Terminal
POS terminals rely on the ATSAM4SD32CA-AUR for transaction processing, secure PIN entry, and peripheral management. The 2 MB Flash fits the full EMVCo Level 2 kernel plus application code, while 160 KB SRAM holds transaction scratch buffers. USB Full-Speed connects to external card readers and printers. The 12-bit DAC generates audio prompts and buzzer tones. Cortex-M4 single-precision FPU accelerates RSA and ECC operations used in contactless payment. Industrial-grade LQFP package tolerates long-life deployment in retail.
Recommended
Connected HMI Touch Panel
Human-machine interface panels with TFT LCDs and capacitive touch use the ATSAM4SD32CA-AUR for graphics rendering, touch decoding, and protocol bridging. The 2 MB Flash stores multilingual UI assets and bitmaps without external memory. The 100-LQFP exposes enough GPIO for 4-wire resistive or I2C/I3C capacitive touch controllers plus parallel LCD interface. Three USARTs connect to PLC fieldbuses, and the 12-bit ADC reads back-light and supply monitoring. Cortex-M4 DSP accelerates touchscreen gesture recognition.
Recommended
Medical Point-of-Care Diagnostic Device
Portable diagnostic devices such as blood-gas analyzers and glucose meters use the ATSAM4SD32CA-AUR for sensor readout, fluidic control, and BLE/USB data upload. The 12-bit ADC with 16 channels reads multiple electrochemistry sensors, while DMA double-buffering maintains continuous sampling. The Cortex-M4 single-precision FPU executes calibration math in real time. USB Full-Speed charges the internal battery and streams logs to a host PC. The 100-LQFP package and -40 to +85 C industrial grade are suitable for clinical and field use.
Recommended
Recommended Products Summary
Engineering reference data for ATSAM4SD32CA-AUR — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | ATSAM4SD32CB-AUR | ATSAM4SD32CA-CUR | ATSAM4SD32CA-AU | ATSAM4SD32CA-ANR | ATSAM4SD32BA-AU | ATSAM4S16CA-AUR |
|---|---|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 100-LQFP (14x14) | 100-LQFP (14x14) - same | 100-LQFP (14x14) - same | 100-LQFP (14x14) - same | 100-LQFP (14x14) - same | 100-LQFP (14x14) - same | 100-LQFP (14x14) - same |
| Core | ARM Cortex-M4 with FPU | ARM Cortex-M4 with FPU | ARM Cortex-M4 with FPU | ARM Cortex-M4 with FPU | ARM Cortex-M4 with FPU | ARM Cortex-M4 with FPU | ARM Cortex-M4 with FPU |
| Maximum Clock Frequency | 120 MHz | 120 MHz | 120 MHz | 120 MHz | 120 MHz | 120 MHz | 120 MHz |
| Flash Memory | 2 MB | 2 MB | 2 MB | 2 MB | 2 MB | 1 MB (-50%) | 1 MB (-50%) |
| SRAM | 160 KB | 160 KB | 160 KB | 160 KB | 160 KB | 160 KB | 128 KB |
| USB | 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 | USB 2.0 Full-Speed | USB 2.0 Full-Speed |
| 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 | -40 C to +85 C |
| Packaging | Tape and Reel | Tape and Reel | Tray | Tray | Tape and Reel | Tray | Tape and Reel |
| Pinout Compatibility | Reference | 100% pin-compatible | 100% pin-compatible | 100% pin-compatible | 100% pin-compatible | 100% pin-compatible | 100% pin-compatible |
Key Differentiators
- Largest Flash density in the ATSAM4S 100-LQFP family (vs ATSAM4S16CA-AUR)
- Industrial-grade operating range on a 32-bit Cortex-M4 with FPU (vs ATSAM4SD32CA-AU)
- On-chip USB 2.0 Full-Speed with integrated PHY (vs ATSAM4S8CA-AU)
Design Notes
The ATSAM4SD32CA-AUR integrates a 1.2 V core regulator that draws from the VDDIO rail. Decouple VDDIO with a 100 nF ceramic capacitor placed within 5 mm of the pin, plus a bulk 4.7 uF on the same rail. If USB is enabled, VDDUTMIs requires a separate 100 nF + 4.7 uF decoupling network. Adding a 10 uF bulk capacitor on the main 3.3 V rail improves transient response during peak CPU load transitions from sleep to active mode.
The 100-pin LQFP at 0.5 mm pitch demands careful routing: keep trace width at least 0.15 mm and use a 4-layer PCB with continuous ground plane under the package to handle the 120 MHz core switching. Place the 16 MHz external crystal (if used) within 5 mm of XIN/XOUT with symmetric ground-guard traces. The exposed thermal pad (if present on the package variant) must be soldered to a copper pour of at least 10 mm x 10 mm with thermal vias to the internal ground plane.
Do not leave NRST floating - it requires a 10 kohm pull-up to VDDIO and a 100 nF capacitor to ground for clean reset behavior. ERASE pin must be tied to VDDIO through a 10 kohm pull-up to prevent unintended Flash erase during power-up glitches. The JTAG/SWD pins (TDI, TDO, TMS, TCK, NRST) must be brought out to a 2x5 or 1x10 header for production programming and field firmware updates. Avoid using PB10/PB11 for GPIO if USB is needed; these pins are the USB D+/D- differential pair.
Compliance Information
RoHS and lead-free compliant per Microchip product page. Not AEC-Q100 qualified - for automotive designs consider SAM V71/V70 family. Halogen-free status not explicitly stated in provided data.
