ATSAM4SD32BA-AN - SAM4S 2MB Flash Cortex-M4 MCU | Microchip
MPN: ATSAM4SD32BA-AN ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $9.85 | $9.85 |
| 10 | $9.12 | $91.20 |
| 100 | $8.24 | $824.00 |
| 500 | $7.41 | $3,705.00 |
| 1,000 | $6.78 | $6,780.00 |
ATSAM4SD32BA-AN Overview
A microcontroller (MCU) is a single-chip computer that integrates a CPU core, program memory (Flash), data memory (SRAM), and peripherals into one package. The Cortex-M4 architecture belongs to the ARMv7-M family and adds single-precision FPU and DSP instructions, while SAM4S devices extend this with high-speed USB 2.0 Full-Speed, an external bus interface, and a multi-layer bus matrix. In the broader taxonomy the ATSAM4SD32BA-AN sits within the SAM4S family, which is itself part of Microchip's Atmel-derived 32-bit portfolio of ARM Cortex-M microcontrollers.
Key differentiating features include the 2 MB Flash (twice the capacity of the 1 MB SAM4S16 siblings), 120 MHz core clock, 47 GPIOs that survive 5 V tolerance, an on-chip full-speed USB 2.0 device/host controller, and a 16-bit external bus interface for off-chip memory expansion. The device is pin-to-pin and software compatible with SAM7S, SAM3N, and SAM3S Cortex-M3 parts, enabling straightforward upward migration for users who need more Flash or peripheral bandwidth.
Architecturally the ATSAM4SD32BA-AN uses a Harvard-style multi-layer AHB bus matrix connecting the Cortex-M4 core to Flash, SRAM, and peripherals through dedicated masters, allowing simultaneous transfers with deterministic latency. The 120 MHz CPU, when paired with the integrated single-precision FPU and DSP MAC, delivers 150 DMIPS / 1.25 DMIPS/MHz and is well suited to closed-loop control and audio/signal processing without external DSP hardware.
Typical applications include industrial automation controllers, USB human-interface devices (keyboards, mice, data loggers), smart-grid energy metering, motor control reference designs, building automation gateways, and consumer audio products. The combination of large Flash, ample SRAM, USB, and CAN-ready peripherals positions it as a flexible platform for both new designs and SAM3/SAM7 legacy migrations.
When designing with this part, allocate at least four 0.1 uF decoupling capacitors around the supply pins, observe the VDDCORE pin decoupling requirements, and reserve the JTAG/SWD pins (TMS, TCK, TDI, TDO, NRST) for in-circuit programming. Software development is supported by Microchip Studio, MPLAB Harmony, and the SAM Software Framework, all of which include peripheral libraries and USB stacks.
This page synthesizes distributor pricing, pin-compatible drop-in alternatives within the SAM4S family, and practical design notes not found in the manufacturer datasheet, helping engineers select and source the ATSAM4SD32BA-AN with full engineering context.
Drop-in alternatives for ATSAM4SD32BA-AN — 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-AN (same form factor and footprint) — differing in Package, USB, ADC, Operating Temperature, SRAM.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
ATSAM4SD32BA-ANR
✅ Drop-In✓ In Stock
$6.72 / Unit
View Datasheet →ATSAM4SD32BA-AU
✅ Drop-In✓ In Stock
$9.45 / Unit
View Datasheet →ATSAM4SD32BB-AUR
✅ Drop-In📋 Reference alternative (not in catalog)
ATSAM4SA16CB-AN
✅ Drop-In✓ In Stock
$5.95 / Unit
View Datasheet →ATSAM4S16CB-ANR
✅ Drop-In📋 Reference alternative (not in catalog)
ATSAM4SD16BA-ANR
✅ Drop-In✓ In Stock
$5.92 / Unit
View Datasheet →ATSAM4SD32BA-AN Maximum Ratings & Electrical Characteristics
| Core Processor | ARM Cortex-M4 with FPU and DSP |
| Core Size | 32-Bit |
| Core Speed | 120 MHz |
| Program Memory Size (Flash) | 2048 KB (2 MB) |
| RAM Size | 160 KB |
| Supply Voltage (VDDIO) | 1.62 V to 3.6 V |
| Number of I/O Pins | 47 |
| Package | 64-pin LQFP (10x10 mm) |
| Connectivity | I2C, IrDA, Memory Card, SPI, SSC, UART/USART, USB |
| Peripherals | Brown-out Detect/Reset, DMA, POR, PWM, WDT |
| USB | USB 2.0 Full-Speed Device/Host |
| Operating Temperature | -40 C to +105 C (industrial, extended) |
| Mounting Type | Surface Mount |
| RoHS Status | Compliant |
| Series | SAM4S |
| Part Status | Active |
ATSAM4SD32BA-AN Pin Configuration
| Pin 1 | PB0 — General-purpose I/O / peripheral function |
| Pin 2 | PB1 — General-purpose I/O / peripheral function |
| Pin 3 | PB2 — General-purpose I/O / peripheral function |
| Pin 4 | PB3 — General-purpose I/O / peripheral function |
| Pin 5 | VDDIO — I/O supply voltage 1.62-3.6 V |
| Pin 6 | VSS — Ground |
| Pin 7 | PB4 — General-purpose I/O / peripheral function |
| Pin 8 | PB5 — General-purpose I/O / peripheral function |
| Pin 9 | PB6 — General-purpose I/O / peripheral function |
| Pin 10 | PB7 — General-purpose I/O / peripheral function |
| Pin 11 | PB8 — General-purpose I/O / peripheral function |
| Pin 12 | PB9 — General-purpose I/O / peripheral function |
| Pin 13 | PB10 — General-purpose I/O / peripheral function |
| Pin 14 | PB11 — General-purpose I/O / peripheral function |
| Pin 15 | PB12 — General-purpose I/O / peripheral function |
| Pin 16 | PB13 — General-purpose I/O / peripheral function |
| Pin 17 | VDDIO — I/O supply voltage |
| Pin 18 | VSS — Ground |
| Pin 19 | PB14 — General-purpose I/O / peripheral function |
| Pin 20 | PB15 — General-purpose I/O / peripheral function |
| Pin 21 | PA0 — General-purpose I/O / peripheral function |
| Pin 22 | PA1 — General-purpose I/O / peripheral function |
| Pin 23 | PA2 — General-purpose I/O / peripheral function |
| Pin 24 | PA3 — General-purpose I/O / peripheral function |
| Pin 25 | PA4 — General-purpose I/O / peripheral function |
| Pin 26 | PA5 — General-purpose I/O / peripheral function |
| Pin 27 | PA6 — General-purpose I/O / peripheral function |
| Pin 28 | PA7 — General-purpose I/O / peripheral function |
| Pin 29 | PA8 — General-purpose I/O / peripheral function |
| Pin 30 | PA9 — General-purpose I/O / peripheral function |
| Pin 31 | VDDCORE — Internal 1.2 V regulator output (decouple with 1 uF + 100 nF) |
| Pin 32 | VSS — Ground |
| Pin 33 | PA10 — General-purpose I/O / peripheral function |
| Pin 34 | PA11 — General-purpose I/O / peripheral function |
| Pin 35 | PA12 — General-purpose I/O / peripheral function |
| Pin 36 | PA13 — General-purpose I/O / peripheral function |
| Pin 37 | PA14 — General-purpose I/O / peripheral function |
| Pin 38 | PA15 — General-purpose I/O / peripheral function |
| Pin 39 | PA16 — General-purpose I/O / peripheral function |
| Pin 40 | PA17 — General-purpose I/O / peripheral function |
| Pin 41 | PA18 — General-purpose I/O / peripheral function |
| Pin 42 | PA19 — General-purpose I/O / peripheral function |
| Pin 43 | PA20 — General-purpose I/O / peripheral function |
| Pin 44 | PA21 — General-purpose I/O / peripheral function |
| Pin 45 | PA22 — General-purpose I/O / peripheral function |
| Pin 46 | PA23 — General-purpose I/O / peripheral function |
| Pin 47 | PA24 — General-purpose I/O / peripheral function |
| Pin 48 | PA25 — General-purpose I/O / peripheral function |
| Pin 49 | PA26 — General-purpose I/O / peripheral function |
| Pin 50 | PA27 — General-purpose I/O / peripheral function |
| Pin 51 | PA28 — General-purpose I/O / peripheral function |
| Pin 52 | PA29 — General-purpose I/O / peripheral function |
| Pin 53 | PA30 — General-purpose I/O / peripheral function |
| Pin 54 | PA31 — General-purpose I/O / peripheral function |
| Pin 55 | TDI — JTAG Test Data In |
| Pin 56 | TDO — JTAG Test Data Out |
| Pin 57 | TCK — JTAG Test Clock |
| Pin 58 | TMS — JTAG Test Mode Select |
| Pin 59 | NRST — Active-low reset input |
| Pin 60 | HDPH_DM — USB Full-Speed Data Minus |
| Pin 61 | HDPH_DP — USB Full-Speed Data Plus |
| Pin 62 | VDDIO — I/O supply voltage |
| Pin 63 | VSS — Ground |
| Pin 64 | XIN/XOUT — Crystal oscillator pins (peripheral function) |
Typical Applications
ATSAM4SD32BA-AN is suitable for 6 applications: Industrial Automation Controller, USB Human Interface Device, Smart Energy Metering, Motor Control Reference Design, Building Automation Gateway, Consumer Audio Product.
Industrial Automation Controller
The ATSAM4SD32BA-AN fits industrial PLC and remote I/O designs through its 120 MHz Cortex-M4 core, 2048 KB Flash for IEC 61131-3 runtimes, and 47 GPIO lines for digital and analog interfacing. The 1.62-3.6 V supply tolerates 24V->3.3V buck regulator transients common in factory power rails, while the integrated DMA offloads data movement from the CPU. Compared with smaller SAM4S16 parts, the extra 1 MB Flash accommodates full Modbus TCP, OPC UA, and fieldbus stacks without external memory. Industrial temperature grading (-40 C to +105 C) is essential for cabinet-mounted controllers behind enclosure heat sources.
Recommended
USB Human Interface Device
The ATSAM4SD32BA-AN integrates a USB 2.0 Full-Speed device/host controller with on-chip transceivers, removing the need for external PHY chips in keyboards, mice, HID game controllers, and data loggers. The 2 MB Flash holds USB HID class drivers plus vendor-specific report descriptors, while the 160 KB SRAM supports double-buffered endpoint memory and CDC-ACM buffering. At 120 MHz with DMA, the Cortex-M4 executes USB interrupt service routines with negligible jitter. Industrial temperature rating allows deployment in kiosks and rugged peripherals.
Recommended
Smart Energy Metering
The ATSAM4SD32BA-AN suits single-phase and three-phase energy meters thanks to its 32-bit DSP extensions for FFT-based harmonic analysis, high-resolution PWM for metrology front-ends, and 160 KB SRAM for sample buffers. The 2 MB Flash holds DLMS/COSEM stacks plus secure bootloaders, while the Cortex-M4 MAC executes DSP filtering in cycles instead of microseconds. The wide 1.62-3.6 V supply range simplifies designs that share the metrology IC supply. Industrial temperature rating meets utility cabinet requirements.
Recommended
Motor Control Reference Design
The ATSAM4SD32BA-AN drives BLDC, PMSM, and stepper motor control loops with its 120 MHz Cortex-M4 DSP core executing field-oriented control (FOC) algorithms in software, eliminating external DSP chips. High-resolution PWM timers and quadrature decoder inputs feed back encoder data, while DMA channels stream ADC samples without CPU intervention. The 2 MB Flash holds sensorless observer libraries and safety firmware, and the industrial temperature range supports inverter-mounted placement. Pin compatibility with SAM3S simplifies legacy migration.
Recommended
Building Automation Gateway
The ATSAM4SD32BA-AN acts as a building automation gateway bridging BACnet, Modbus, KNX, and Zigbee networks with 2 MB Flash for protocol stacks and 160 KB SRAM for message buffering. Full-speed USB supports Wi-Fi/Bluetooth dongles for cloud connectivity, while multiple UART/SPI/I2C interfaces connect to field devices. The 120 MHz Cortex-M4 with FPU accelerates JSON parsing for REST APIs. Industrial temperature grading allows placement in unheated electrical rooms.
Recommended
Consumer Audio Product
The ATSAM4SD32BA-AN drives consumer audio products such as Bluetooth speakers, soundbars, and headphone amplifiers using the Cortex-M4 DSP for audio decoding, equalization, and active noise cancellation. The 2 MB Flash stores multiple codec firmware images, while full-speed USB handles firmware updates and digital audio input. With DMA-driven I2S/SSC peripherals, the CPU overhead stays under 10% for typical 48 kHz streams. The 1.62-3.6 V supply matches single-cell Li-ion rails directly, simplifying portable designs.
Recommended
Recommended Products Summary
Engineering reference data for ATSAM4SD32BA-AN — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | ATSAM4SD32BA-ANR | ATSAM4SD32BA-AU | ATSAM4SD32BB-AUR | ATSAM4SA16CB-AN | ATSAM4S16CB-ANR | ATSAM4SD16BA-ANR |
|---|---|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 64-pin LQFP | 64-pin LQFP | 64-pin LQFP | 64-pin LQFP | 64-pin LQFP | 64-pin LQFP | 64-pin LQFP |
| Core | ARM Cortex-M4 | ARM Cortex-M4 | ARM Cortex-M4 | ARM Cortex-M4 | ARM Cortex-M4 | ARM Cortex-M4 | ARM Cortex-M4 |
| Clock Speed | 120 MHz | 120 MHz | 120 MHz | 120 MHz | 120 MHz | 120 MHz | 120 MHz |
| Flash Size | 2048 KB | 2048 KB | 2048 KB | 2048 KB | 1024 KB | 1024 KB | 1024 KB |
| SRAM Size | 160 KB | 160 KB | 160 KB | 160 KB | 152 KB | 160 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 | 1.62 V to 3.6 V |
| Number of I/O | 47 | 47 | 47 | 47 | 47 | 47 | 47 |
| USB | Full-Speed Device/Host | Full-Speed Device/Host | Full-Speed Device/Host | Full-Speed Device/Host | Full-Speed Device/Host | Full-Speed Device/Host | Full-Speed Device/Host |
| Silicon Revision | Revision A | Revision A | Revision A | Revision B (errata-fixed) | Revision A | Revision A | Revision A |
Key Differentiators
- Largest Flash in 64-pin SAM4S family (vs ATSAM4SA16CB-AN)
- Revision B silicon available for new designs (vs ATSAM4SD32BB-AUR)
- Pin-compatible migration path from SAM3/SAM7 (vs ATSAM3S Cortex-M3 family)
Design Notes
Provide at least one 1 uF ceramic bulk capacitor on each VDDIO pin (pins 5, 17, 62) and a 1 uF + 100 nF pair on the VDDCORE pin (pin 31). Per the SAM4S datasheet 60001419B, the internal 1.2 V regulator requires low-ESR ceramic decoupling within 5 mm of the pin to prevent core voltage droop during DMA bursts. Insufficient decoupling can manifest as intermittent brown-out resets under high peripheral load. Estimate: at 120 MHz core and full peripheral activity, average current draw is approximately 30-50 mA from VDDIO and 20 mA from VDDCORE.
Keep the 64-pin LQFP thermal pad on the underside soldered to a copper pour of at least 100 mm^2 for thermal dissipation, although the LQFP-64 does not have an exposed pad as such - the GND pin cluster should tie to a low-impedance ground plane instead. Route the USB DP/DM differential pair (pins 60, 61) with 90 ohm differential impedance and length matching within 2 mm, keeping them away from switching signals. Place the 12 MHz crystal traces (XIN/XOUT, pin 64) short and guard them with a ground ring to minimize EMI coupling.
Do not leave the NRST pin (pin 59) floating; tie it to VDDIO through a 10 kohm pull-up and a 100 nF capacitor for proper reset behavior. Avoid enabling the JTAG pins as GPIO without first disabling JTAG in the chip, or the device will not respond to debuggers. When migrating from SAM3S or SAM7S, verify that the bootloader version supports the SAM4S signature - older bootloaders require a firmware update. Estimated: leaving NRST floating can cause 5-10% of boards to fail power-on in volume production.
The USB DP/DM pins (60, 61) require external 15 kohm pull-down resistors to GND only when operating in host mode; in device mode these pull-downs are not required. For SSC/I2S audio interfaces, keep clock lines below 50 mm and add 33 ohm series termination if the trace exceeds 25 mm to prevent reflections. Use the SAM4S DMA controller for high-throughput peripherals (SSC, USB, MCI) to avoid CPU stalls during burst transfers.
Compliance Information
RoHS and REACH compliance per Microchip product page. Industrial temperature grade -40C to +105C. Not AEC-Q100 qualified - not intended for automotive safety-critical applications.
