ATSAM4SD32CB-AN - 2MB Flash Cortex-M4 MCU 100-LQFP | Microchip
MPN: ATSAM4SD32CB-AN β Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $13.55 | $13.55 |
| 10 | $12.2 | $122.00 |
| 100 | $10.85 | $1,085.00 |
| 500 | $9.6 | $4,800.00 |
| 1,000 | $8.45 | $8,450.00 |
ATSAM4SD32CB-AN Overview
An ARM Cortex-M4 microcontroller is a 32-bit RISC processor core designed by Arm that includes a single-precision IEEE 754 floating-point unit (FPU), a Memory Protection Unit (MPU), and DSP extensions. Within Microchip's broader hierarchy it sits under the SAM family -> SAM4S sub-family -> ARM Cortex-M4 series, occupying a position aimed at high-performance industrial and consumer embedded designs where deterministic control and connectivity coexist.
Key features of the ATSAM4SD32CB-AN include dual-bank Flash for in-application reprogramming, a unique 128-bit serial number, a true random number generator (TRNG), and Cryptography accelerators (AES, TDES). The part is rated for the extended industrial temperature range up to +105C, and uses a 1.2V core supply. It is pin-compatible with the rest of the SAM4S family (SAM4S2/4/8/16/32) in the same 100-LQFP outline, allowing design scalability.
Architecturally, the SAM4SD32 pairs the Cortex-M4 core with a multi-layer bus matrix that gives the CPU, DMAC, and peripherals simultaneous access to Flash and SRAM, eliminating contention. The dual-bank Flash and the peripheral event system enable deterministic interrupt latency and zero-latency interrupt responses, which are critical for motor control, power conversion, and real-time communications.
Typical applications include industrial control and HMI, USB peripherals and HID devices, smart energy metering, point-of-sale terminals, barcode scanners, and machine-to-machine (M2M) gateways. The combination of USB, Ethernet, and Cortex-M4 DSP capability also makes it attractive for audio processing nodes and low-cost PLCs. When designing with this device, ensure that the 1.2V core rail is decoupled close to the VDD pins and that the external reset circuit meets the datasheet's minimum reset pulse width. The flash dual-bank layout also requires that bootloader and application boundaries are planned early.
This page synthesizes distributor pricing, pin-to-pin compatible SAM4S family alternatives, and practical design notes not consolidated on the manufacturer product page.
Drop-in alternatives for ATSAM4SD32CB-AN 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 ATSAM4SD32CB-AN (same form factor and footprint) β differing in Package, RoHS Status, Operating Temperature, ADC, Mounting Type.
Quick Comparison Tool β Select alternative parts for side-by-side comparison:
ATSAM4SD32CA-AN
β Drop-Inβ In Stock
$9.45 / Unit
View Datasheet βATSAM4SD32CB-ANR
β Drop-Inπ Reference alternative (not in catalog)
ATSAM4SD16CB-ANR
β Drop-Inβ In Stock
$7.3 / Unit
View Datasheet βATSAM4S16CB-AN
β Drop-Inπ Reference alternative (not in catalog)
ATSAM4S8CB-AN
β Drop-Inπ Reference alternative (not in catalog)
ATSAM4SA16CB-AN
β Drop-Inβ In Stock
$5.95 / Unit
View Datasheet βATSAM4SD32CB-AN Maximum Ratings & Electrical Characteristics
| Core Processor | ARM Cortex-M4 |
| Core Size | 32-Bit |
| Maximum CPU Clock | 120 MHz |
| Program Memory (Flash) | 2 MB (2048 Kbytes, dual-bank) |
| SRAM | 160 KB |
| Supply Voltage (Core) | 1.2 V |
| Supply Voltage (I/O) | 3.3 V |
| Package | 100-LQFP (14x14 mm) |
| Operating Temperature | -40C to +105C (Extended) |
| USB | Full-Speed USB Device with embedded transceiver |
| Ethernet | 10/100 GMAC (Ethernet MAC) |
| ADC | 10-bit, up to 24 channels |
| PWM Channels | 16-bit PWM |
| Communication Interfaces | UART, USART, SPI, TWI (I2C), CAN (optional via variant) |
| Cryptography | AES, TDES accelerators; True Random Number Generator (TRNG) |
| RoHS Status | ROHS3 Compliant |
| Mounting Type | Surface Mount (LQFP) |
ATSAM4SD32CB-AN 100-lqfp (14x14 mm) Pin Configuration Guide
Pin configuration for ATSAM4SD32CB-AN (100-lqfp (14x14 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 ATSAM4SD32CB-AN.
Refer to the datasheet for full pin configuration.
Typical Applications
ATSAM4SD32CB-AN is suitable for 6 applications: Industrial Control & HMI, USB Peripherals and HID Devices, Smart Energy Metering, Point-of-Sale (POS) Terminals, Machine-to-Machine (M2M) Gateways, Audio Processing Nodes.
Industrial Control & HMI
The ATSAM4SD32CB-AN's 120 MHz Cortex-M4 with FPU and 2 MB of dual-bank Flash make it well-suited to industrial controllers and human-machine interfaces (HMIs). Its operating temperature range of -40C to +105C matches the requirements of factory-floor enclosures, and the integrated PWM timers, ADC, and event system drive motor-control loops and graphical displays with deterministic latency. In an HMI the 2 MB Flash holds a TFT GUI plus bootloader, while 160 KB SRAM buffers the frame buffer and protocol stacks.
Recommended
USB Peripherals and HID Devices
With its full-speed USB Device port and embedded transceiver, the ATSAM4SD32CB-AN targets USB peripherals such as HID controllers, custom instrumentation, and USB-to-UART bridges. The dual-bank Flash enables safe firmware upgrades over USB without bricking the device, while the Cortex-M4 FPU handles signal conditioning or audio streaming simultaneously. An external 5V-to-3.3V LDO and proper VBUS handling per the SAM4S datasheet are the key implementation considerations.
Recommended
Smart Energy Metering
The ATSAM4SD32CB-AN suits single-phase and three-phase smart energy meters: 160 KB SRAM holds metering firmware and metrology buffers, while the 16-bit PWM and event system drive calibration routines and zero-crossing detection. The TRNG and AES accelerators enable secure communications for AMI (Advanced Metering Infrastructure), and the extended temperature range ensures accuracy in outdoor cabinets. Designers should reference the Atmel-11100 datasheet for ADC calibration to meet IEC-style metrology tolerances.
Recommended
Point-of-Sale (POS) Terminals
POS terminals benefit from the ATSAM4SD32CB-AN's combination of USB Device, GMAC, and 2 MB Flash. The Cortex-M4 FPU accelerates encryption for PCI-PTS payment flows, and the dual-bank Flash supports secure firmware updates without service interruption. Up to five USARTs and three SPIs connect to mag-stripe readers, NFC modules, and thermal printers, while the Ethernet MAC provides IP-based reporting. The trade-off versus higher-end Cortex-M7 parts is modest CPU throughput but significantly lower BOM cost.
Recommended
Machine-to-Machine (M2M) Gateways
The ATSAM4SD32CB-AN's GMAC plus USB plus serial interfaces make it a low-power M2M gateway controller. The Cortex-M4 can run MQTT or HTTP clients directly from Flash, while hardware AES/TDES offloads secure transport handshakes. Dual-bank firmware allows OTA updates critical for remote deployments. Compared to Cortex-M7 gateways, the SAM4SD32 sacrifices raw throughput but gains power efficiency and a simpler PCB layout thanks to its integrated Ethernet MAC.
Recommended
Audio Processing Nodes
The Cortex-M4 FPU in the ATSAM4SD32CB-AN executes single-precision DSP routines, supporting audio preprocessing, equalization, and basic codec algorithms. The 160 KB SRAM is sufficient for small audio buffers, while 2 MB Flash stores waveform tables and configuration presets. Combined with the I2S-ready peripherals and DMA, this part is used in networked speakers, intercom panels, and voice prompt modules. A hardware floating-point engine typically delivers 3-5x performance gains over fixed-point cores at the same clock.
Recommended
Recommended Products Summary
Engineering reference data for ATSAM4SD32CB-AN β comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | ATSAM4SD32CA-AN | ATSAM4SD32CB-ANR | ATSAM4SD16CB-ANR | ATSAM4S16CB-AN | ATSAM4S8CB-AN | ATSAM4SA16CB-AN |
|---|---|---|---|---|---|---|---|
| Package | 100-LQFP (14x14 mm) | 100-LQFP (14x14 mm) - same | 100-LQFP (14x14 mm) - same | 100-LQFP (14x14 mm) - same | 100-LQFP (14x14 mm) - same | 100-LQFP (14x14 mm) - same | 100-LQFP (14x14 mm) - same |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | 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 | ARM Cortex-M4 @ 120 MHz | ARM Cortex-M4 @ 120 MHz | ARM Cortex-M4 @ 120 MHz |
| Flash Memory | 2 MB (dual-bank) | 2 MB (dual-bank) | 2 MB (dual-bank) | 1 MB (dual-bank) | 1 MB (single-bank) | 512 KB (single-bank) | 1 MB (single-bank) |
| SRAM | 160 KB | 160 KB | 160 KB | 160 KB | 160 KB | 128 KB | 160 KB |
| Operating Temperature | -40C to +105C (Extended) | -40C to +105C | -40C to +105C | -40C to +105C | -40C to +105C | -40C to +105C | -40C to +105C |
| USB Device | Full-Speed (embedded transceiver) | Full-Speed (embedded transceiver) | Full-Speed (embedded transceiver) | Full-Speed (embedded transceiver) | Full-Speed (embedded transceiver) | Full-Speed (embedded transceiver) | Full-Speed (embedded transceiver) |
| Ethernet MAC | 10/100 GMAC | 10/100 GMAC | 10/100 GMAC | 10/100 GMAC | 10/100 GMAC | 10/100 GMAC | 10/100 GMAC |
Key Differentiators
- Dual-bank Flash for in-application firmware updates (vs ATSAM4S16CB-AN)
- Latest errata-revision silicon (Revision B) (vs ATSAM4SD32CA-AN)
- Extended temperature grade (+105C) (vs ATSAM4S8CB-AN (commercial variants))
Design Notes
Decouple the 1.2V core rail and 3.3V I/O rail with separate bulk and high-frequency capacitors placed within 5 mm of the respective VDD pins. Per the Atmel-11100 SAM4S datasheet, the recommended 1.2V decoupling network is one 4.7 uF ceramic plus one 100 nF ceramic per VDD pin pair; failing to do this can produce brownouts during CPU load steps. A linear LDO or switching regulator with at least 200 mA headroom is recommended.
At 120 MHz and full peripheral utilization, the ATSAM4SD32CB-AN can dissipate around 200-250 mW. The 100-LQFP package has theta_JA of approximately 35-40 C/W on a standard JEDEC 4-layer board, so junction temperature rise above ambient stays under 10 C. For +105C ambient industrial use, ensure copper pour on VDD/GND pads and at least one inner ground plane to keep die temperature below +125C.
Route the USB DP/DM traces as a 90-ohm differential pair per the SAM4S datasheet, and place the series source-matching resistors within 2 mm of the IC. The GMAC RMII/REFI clock and data lines should be routed with controlled impedance and length-matched; do not run them parallel to switching traces. A continuous ground plane under the LQFP improves signal integrity and EMI.
Do not exceed the 3.3V I/O absolute maximum. Always run the bootloader with the BSCR (Boot Select) register configured to match the actual boot media (Flash bank 0, bank 1, or SAM-BA bootloader). Firmware that assumes bank 0 boot will fail to start when the dual-bank swap is enabled. The 32.768 kHz crystal selection affects RTC accuracy: a 12 pF load crystal requires corresponding crystal loading capacitors.
Compliance Information
ROHS3 Compliant per Heisener and Microchip USA product listings. Not AEC-Q100 qualified (industrial MCU, not automotive grade).
