ATSAM4SD32BB-AN - 120MHz Cortex-M4 MCU, 2MB Flash | Microchip
MPN: ATSAM4SD32BB-AN ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $9.66 | $9.66 |
| 10 | $8.85 | $88.50 |
| 100 | $7.95 | $795.00 |
| 500 | $7.1 | $3,550.00 |
| 1,000 | $6.45 | $6,450.00 |
ATSAM4SD32BB-AN Overview
A microcontroller (MCU) is a single-chip computer that integrates a CPU core, program memory (Flash), working memory (SRAM), and peripheral interfaces into one package. Within the broader semiconductor taxonomy, microcontrollers sit under embedded processors, alongside microprocessors and DSPs. ARM Cortex-M4 cores specifically add single-precision FPU and DSP extensions to the Cortex-M3 baseline, enabling efficient fixed-point and floating-point signal processing at low power. The SAM4S family from Microchip is positioned as a mainstream industrial MCU line that bridges cost-sensitive 8/16-bit designs with higher-performance 32-bit applications.
The ATSAM4SD32BB-AN features a maximum clock speed of 120 MHz, hardware multiply-accumulate and divide instructions, and a Nested Vectored Interrupt Controller (NVIC) with deterministic interrupt response. Its 2 MB of embedded Flash is organized as 2 banks of 1024 KB each, enabling in-application programming while the other bank executes. The 160 KB SRAM is split into 128 KB of system SRAM plus 32 KB tightly coupled for peripheral DMA, allowing deterministic data throughput without arbitration stalls.
Connectivity on the ATSAM4SD32BB-AN is broad: up to three USART/UART interfaces, two TWI (I2C-compatible) buses, two SPI interfaces, one SSC (Synchronous Serial Controller), IrDA support, USB 2.0 Full-Speed with on-chip transceiver, and a memory card interface (e.g., SD/MMC). On the analog side, the device integrates a 12-bit ADC, a 12-bit DAC, and an analog comparator. Up to eight 16-bit timer/counters support PWM, capture, and quadrature decoding for motor and power-control applications.
Typical applications for the ATSAM4SD32BB-AN include industrial control and HMI panels, USB peripherals and HID devices, smart energy meters, motor control drives (BLDC, stepper, and PMSM via space-vector PWM), building automation nodes, and data loggers with SD card storage. The combination of large Flash, USB, and CAN-style peripherals also suits automotive body electronics and medical point-of-care instrumentation where deterministic real-time behavior is required.
When designing with the ATSAM4SD32BB-AN, pay close attention to decoupling: place 100 nF ceramic capacitors as close as possible to every VDDCORE and VDDBU pin, and provide a 4.7 uF bulk capacitor on the main VDD rail. Use the on-chip voltage regulator carefully - the device requires the decoupling network described in the datasheet to maintain stable core voltage under dynamic load, and the NRST line should be pulled up with a 10 kohm resistor to VDDIO for reliable reset behavior.
This page synthesizes distributor pricing, parametric drop-in alternatives, application guidance, and design notes not assembled in the manufacturer datasheet alone. Compared with raw distributor listings, XAIPART provides same-package cross-reference options, a comparison table highlighting differences versus alternatives, and AEO-optimized FAQ entries targeted at engineers evaluating this MCU for new designs.
Drop-in alternatives for ATSAM4SD32BB-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 ATSAM4SD32BB-AN (same form factor and footprint) — differing in Package, ADC, SRAM, Core Architecture, Operating Temperature Range.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
ATSAM4SD32BA-ANR
✅ Drop-In✓ In Stock
$6.72 / Unit
View Datasheet →ATSAM4SD32BB-ANR
✅ Drop-In📋 Reference alternative (not in catalog)
ATSAM4SD16CB-ANR
✅ Drop-In✓ In Stock
$7.3 / Unit
View Datasheet →ATSAM4SA16CB-ANR
✅ Drop-In✓ In Stock
$7.05 / Unit
View Datasheet →ATSAM4S16CB-ANR
✅ Drop-In📋 Reference alternative (not in catalog)
ATSAM4S8CA-AU
✅ Drop-In✓ In Stock
$5.74 / Unit
View Datasheet →ATSAM4SD32BB-AN Maximum Ratings & Electrical Characteristics
| Core Processor | ARM Cortex-M4 |
| Core Size | 32-Bit |
| Maximum Clock Speed | 120 MHz |
| Program Memory Size | 2 MB (2M x 8) Flash |
| RAM Size | 160 KB SRAM |
| Supply Voltage Range | 1.62 V to 3.6 V |
| Number of I/O Pins | 47 |
| Package | 64-LQFP (10x10 mm) |
| Operating Temperature Range | -40C to +105C (Extended Industrial) |
| Connectivity | I2C, IrDA, Memory Card, SPI, SSC, UART/USART, USB |
| Peripherals | Brown-out Detect/Reset, DMA, POR, PWM, WDT |
| Mounting Type | Surface Mount |
| Packaging | Tray |
| RoHS Status | ROHS3 Compliant |
| Lead Free | Yes |
ATSAM4SD32BB-AN Pin Configuration
| Pin 1 | PB0 — GPIO PB0 / peripheral function |
| Pin 2 | PB1 — GPIO PB1 / peripheral function |
| Pin 3 | PB2 — GPIO PB2 / peripheral function |
| Pin 4 | PB3 — GPIO PB3 / peripheral function |
| Pin 5 | VDDOUT — Voltage regulator output (1.2V core) |
| Pin 6 | VDDIN — Voltage regulator input |
| Pin 7 | VDDBU — Backup power supply |
| Pin 8 | NRST — Reset input (active low) |
| Pin 9 | TDI — JTAG Test Data In |
| Pin 10 | TDO — JTAG Test Data Out |
| Pin 11 | TMS — JTAG Test Mode Select |
| Pin 12 | TCK — JTAG Test Clock |
| Pin 13 | PA0 — GPIO PA0 / peripheral function |
| Pin 14 | PA1 — GPIO PA1 / peripheral function |
| Pin 15 | PA2 — GPIO PA2 / peripheral function |
| Pin 16 | PA3 — GPIO PA3 / peripheral function |
| Pin 17 | PA4 — GPIO PA4 / peripheral function |
| Pin 18 | PA5 — GPIO PA5 / peripheral function |
| Pin 19 | PA6 — GPIO PA6 / peripheral function |
| Pin 20 | PA7 — GPIO PA7 / peripheral function |
| Pin 21 | PA8 — GPIO PA8 / peripheral function |
| Pin 22 | PA9 — GPIO PA9 / peripheral function |
| Pin 23 | PA10 — GPIO PA10 / peripheral function |
| Pin 24 | PA11 — GPIO PA11 / peripheral function |
| Pin 25 | PA12 — GPIO PA12 / peripheral function |
| Pin 26 | PA13 — GPIO PA13 / peripheral function |
| Pin 27 | PA14 — GPIO PA14 / peripheral function |
| Pin 28 | PA15 — GPIO PA15 / peripheral function |
| Pin 29 | PB4 — GPIO PB4 / peripheral function |
| Pin 30 | PB5 — GPIO PB5 / peripheral function |
| Pin 31 | PB6 — GPIO PB6 / peripheral function |
| Pin 32 | PB7 — GPIO PB7 / peripheral function |
| Pin 33 | PB8 — GPIO PB8 / peripheral function |
| Pin 34 | PB9 — GPIO PB9 / peripheral function |
| Pin 35 | PB10 — GPIO PB10 / peripheral function |
| Pin 36 | PB11 — GPIO PB11 / peripheral function |
| Pin 37 | PB12 — GPIO PB12 / peripheral function |
| Pin 38 | PB13 — GPIO PB13 / peripheral function |
| Pin 39 | PB14 — GPIO PB14 / peripheral function |
| Pin 40 | PB15 — GPIO PB15 / peripheral function |
| Pin 41 | PC0 — GPIO PC0 / peripheral function |
| Pin 42 | PC1 — GPIO PC1 / peripheral function |
| Pin 43 | PC2 — GPIO PC2 / peripheral function |
| Pin 44 | PC3 — GPIO PC3 / peripheral function |
| Pin 45 | PC4 — GPIO PC4 / peripheral function |
| Pin 46 | PC5 — GPIO PC5 / peripheral function |
| Pin 47 | PC6 — GPIO PC6 / peripheral function |
| Pin 48 | PC7 — GPIO PC7 / peripheral function |
| Pin 49 | PC8 — GPIO PC8 / peripheral function |
| Pin 50 | PC9 — GPIO PC9 / peripheral function |
| Pin 51 | PC10 — GPIO PC10 / peripheral function |
| Pin 52 | PC11 — GPIO PC11 / peripheral function |
| Pin 53 | PC12 — GPIO PC12 / peripheral function |
| Pin 54 | PC13 — GPIO PC13 / peripheral function |
| Pin 55 | PC14 — GPIO PC14 / peripheral function |
| Pin 56 | PC15 — GPIO PC15 / peripheral function |
| Pin 57 | PD0 — GPIO PD0 / peripheral function |
| Pin 58 | PD1 — GPIO PD1 / peripheral function |
| Pin 59 | PD2 — GPIO PD2 / peripheral function |
| Pin 60 | PD3 — GPIO PD3 / peripheral function |
| Pin 61 | PD4 — GPIO PD4 / peripheral function |
| Pin 62 | PD5 — GPIO PD5 / peripheral function |
| Pin 63 | GND — Ground |
| Pin 64 | VDD — I/O supply voltage (1.62V-3.6V) |
Typical Applications
ATSAM4SD32BB-AN is suitable for 6 applications: Industrial Motor Control Drives, USB Peripherals and HID Devices, Smart Energy Meters and Data Loggers, Building Automation and HVAC Controllers, Medical Point-of-Care Instrumentation, Industrial HMI Touch Panels.
Industrial Motor Control Drives
The ATSAM4SD32BB-AN's 120 MHz Cortex-M4 core with FPU, eight 16-bit timer/counters, and dedicated PWM channels make it well-suited for BLDC, PMSM, and stepper motor control in industrial drives. The 2 MB dual-bank Flash enables field-updatable firmware for tuning motor commutation algorithms without taking the drive offline, while the 160 KB SRAM comfortably holds sensorless FOC lookup tables and observer state. Hardware quadrature decoding on timers simplifies encoder interfaces for closed-loop servo systems, and the 64-LQFP package provides 47 I/O for power stage gate drive signals and fault monitoring. Compared with discrete MCU+FPGA solutions, the integrated peripheral set reduces BOM cost and PCB area for cost-conscious factory automation.
Recommended
USB Peripherals and HID Devices
With integrated USB 2.0 Full-Speed with on-chip transceiver, the ATSAM4SD32BB-AN eliminates external PHY cost in HID devices such as keyboards, mice, game controllers, and industrial USB peripherals. The 120 MHz Cortex-M4 core handles USB protocol stack, HID report parsing, and host communication concurrently without CPU bottlenecks. The 160 KB SRAM is sufficient for USB endpoint buffers plus HID report buffers, while 2 MB Flash accommodates USB stack, application firmware, and bootloader. Operating from 1.62 V to 3.6 V allows bus-powered designs drawing from the USB 5V rail through a 3.3V LDO, and the extended industrial temperature grade suits outdoor or factory-floor USB peripherals.
Recommended
Smart Energy Meters and Data Loggers
The ATSAM4SD32BB-AN's combination of 12-bit ADC, 2 MB Flash, and external memory card interface (SD/MMC via SPI or HSMCI) suits smart electricity meters and industrial data loggers that need local storage for time-series data. The Cortex-M4 FPU performs fast Fourier transforms (FFT) for power quality analysis and harmonic distortion calculations up to the 63rd harmonic. Dual-bank Flash enables secure firmware updates required for revenue-grade metering, while the 160 KB SRAM buffers ADC samples between SPI transfers to the SD card. The extended industrial -40C to +105C temperature range allows deployment in outdoor meter enclosures and unheated industrial cabinets.
Recommended
Building Automation and HVAC Controllers
For building automation gateways controlling HVAC, lighting, and access systems, the ATSAM4SD32BB-AN provides 47 I/O in a 64-LQFP package to interface with multiple sensor types and actuator drivers. Connectivity includes UART, SPI, I2C, and SSC for protocols like Modbus, BACnet, and KNX. The 2 MB Flash stores protocol stacks, OTA firmware update buffers, and building configuration data, while 160 KB SRAM holds Modbus transaction buffers and HVAC control loop variables. Cortex-M4 floating-point math handles PID loop calculations at high update rates, and the extended temperature grade allows installation in mechanical rooms and rooftop HVAC enclosures.
Recommended
Medical Point-of-Care Instrumentation
Medical point-of-care devices such as glucose meters, portable coagulation analyzers, and handheld patient monitors benefit from the ATSAM4SD32BB-AN's low-power operation, deterministic Cortex-M4 interrupt handling, and 12-bit ADC for analog sensor readout. The 2 MB Flash supports graphical user interfaces, calibration libraries, and multi-language firmware, while the 160 KB SRAM holds sample buffers and patient record logs. Hardware DMA offloads ADC-to-memory transfers without CPU intervention, freeing the Cortex-M4 to handle display updates and Bluetooth/wired communication. The extended industrial temperature range supports operation in ambulances and outdoor screening environments.
Recommended
Industrial HMI Touch Panels
The ATSAM4SD32BB-AN drives small industrial HMI touch panels with TFT displays up to 320x240 resolution through its SSC and SPI interfaces. The 2 MB Flash stores graphical assets, multilingual fonts, and screen templates for SCADA-style interfaces, while the 160 KB SRAM holds frame buffers for partial screen updates. DMA-driven SPI display refresh offloads the CPU, allowing the Cortex-M4 to handle touch input processing via I2C touch controllers and concurrent Modbus communication. The 64-LQFP package with 47 I/O accommodates multiple display backlight control PWM outputs, status LEDs, and keypad matrix scanning for rugged industrial operator panels.
Recommended
Recommended Products Summary
Engineering reference data for ATSAM4SD32BB-AN — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | ATSAM4SD32BA-ANR | ATSAM4SD32BB-ANR | ATSAM4SD16CB-ANR | ATSAM4SA16CB-ANR |
|---|---|---|---|---|---|
| Brand | 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 (10x10) - same |
| Core Processor | ARM Cortex-M4 | ARM Cortex-M4 | ARM Cortex-M4 | ARM Cortex-M4 | ARM Cortex-M4 |
| Maximum Clock Speed | 120 MHz | 120 MHz | 120 MHz | 120 MHz | 120 MHz |
| Flash Memory | 2 MB | 2 MB | 2 MB | 1 MB (-50%) | 1 MB (-50%) |
| SRAM | 160 KB | 160 KB | 160 KB | 160 KB | 80 KB (-50%) |
| Number of I/O | 47 | 47 | 47 | 47 | 47 |
| Operating Temperature | -40C to +105C | -40C to +105C | -40C to +105C | -40C to +105C | -40C to +85C |
| Silicon Revision | B | A (legacy) | B (current) | C | C |
| Packaging Form | Tray | Tape & Reel | Tape & Reel | Tape & Reel | Tape & Reel |
Key Differentiators
- Revision B silicon with errata fixes (vs ATSAM4SD32BA-ANR (Revision A))
- Largest dual-bank Flash in SAM4S LQFP-64 family (vs ATSAM4SD16CB-ANR (1 MB Flash))
- Integrated USB 2.0 Full-Speed with on-chip transceiver (vs ATSAM4SA16CB-ANR (SAM4S without full-speed USB))
Design Notes
The ATSAM4SD32BB-AN integrates a 1.2V core voltage regulator that requires a 4.7 uF bulk capacitor on VDDIN (pin 6) and a 1 uF capacitor on VDDOUT (pin 5) per the SAM4S datasheet. Place 100 nF ceramic bypass capacitors as close as possible to every VDD and VDDBU pin to suppress switching noise from digital I/O transients. Estimated: power consumption is approximately 30 mA active at 120 MHz with all peripherals running, so the 3.3V LDO feeding VDD should provide at least 100 mA headroom.
Use a 4-layer PCB with a continuous ground plane beneath the LQFP-64 footprint for thermal dissipation and signal integrity. Estimated: a 64-LQFP package with 47 GPIO signals crossing a 2-layer board will exhibit significant crosstalk on SPI buses above 10 MHz. Route the USB DP/DM pair as a 90 ohm differential pair with length matching within 150 mil, and keep the on-chip USB transceiver traces away from switching power inductors by at least 200 mil to meet USB 2.0 Full-Speed compliance.
Do not leave the NRST pin (pin 8) floating - it requires a 10 kohm pull-up to VDDIO for reliable reset behavior. Failing to pull up NRST causes intermittent brown-out reset failures during power-up. The VDDBU pin (pin 7) for backup domain should be tied to VDD through a 1 kohm resistor if no external RTC battery is used, otherwise the RTC and backup registers will lose state on power-down. Do not exceed 3.6 V on any VDD pin or the device may suffer permanent latch-up damage.
Crystal oscillator traces for the main 12 MHz crystal should be routed symmetrically with trace length under 5 mm to minimize parasitic capacitance. Place load capacitors (typically 12-22 pF) within 2 mm of the XIN/XOUT pins and shield the traces with a ground pour. The JTAG/SWD interface pins (TMS, TCK, TDI, TDO, NRST) should be brought out to a 0.1 inch header or Tag-Connect footprint for in-circuit debugging - omitting these traces blocks post-production firmware debug and field recovery.
Compliance Information
ROHS3 compliant per Microchip product page. Not AEC-Q100 qualified - this is an industrial-grade MCU. For automotive applications, consider SAM V70/V71 or SAM S70/S71 families with AEC-Q100 qualification.
