ATSAM4S2BB-ANR - 120MHz Cortex-M4 MCU, 128KB Flash | Microchip
MPN: ATSAM4S2BB-ANR β Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $5.29 | $5.29 |
| 10 | $4.81 | $48.10 |
| 100 | $4.32 | $432.00 |
| 500 | $3.95 | $1,975.00 |
| 1,000 | $3.62 | $3,620.00 |
ATSAM4S2BB-ANR Overview
A microcontroller (MCU) is a single-chip computer integrating a processor core, program memory, data memory, and peripherals such as UART, SPI, I2C, ADC, timers, and USB. Within the power-management hierarchy of embedded systems, an MCU replaces multi-chip processor-plus-peripheral solutions and sits below application processors in complexity. The SAM4S series belongs to Microchip (formerly Atmel) ARM-based flash MCU portfolio, positioned for cost-sensitive industrial and consumer control applications.
Key differentiating features include DSP instructions and a Thumb-2 instruction set on the Cortex-M4 core, a Memory Protection Unit (MPU), Flash with ECC, Security Bit and Lock Bits for code protection, and a full-speed USB Device port with embedded transceiver. The Flash accelerator with cache sustains near-zero-wait-state execution at 120 MHz.
Technically, the SAM4S2B combines the Cortex-M4 pipeline with a multi-layer bus matrix and peripheral DMA (PDC) channels, allowing USART, SPI and ADC transfers without CPU intervention. Peripherals include up to 2 UARTs/USARTs, SPI, TWI (I2C), 2-channel 12-bit ADC, PWM channels, and a real-time clock with battery backup domain. The series is pin-to-pin compatible with the SAM3N, SAM3S, SAM4N and legacy SAM7S devices in 48-, 64- and 100-pin versions, providing a migration path for Flash-size and feature upgrades without PCB redesign.
Typical applications include industrial control and automation nodes, consumer appliances, metering systems, motor control with PWM peripherals, and USB-connected embedded devices. The 180 uA backup-mode consumption suits battery-backed metering, while the DSP instructions accelerate filtering and control-loop algorithms.
Design consideration: the 1.62 V to 3.6 V supply requires a stable 3.3 V rail with proper VDDCORE/VDDOUT decoupling per the regulator architecture; use the ERASE pin carefully to avoid accidental Flash bulk erase during production.
This page synthesizes distributor pricing, drop-in alternatives, pinout data, and practical design notes not found in the manufacturer datasheet.
Drop-in alternatives for ATSAM4S2BB-ANR 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 ATSAM4S2BB-ANR (same form factor and footprint).
Quick Comparison Tool β Select alternative parts for side-by-side comparison:
ATSAM4S2BA-AN
β Drop-In β οΈ εζ°εΎ ιͺθ―π Reference alternative (not in catalog)
ATSAM4S2BB-AN
β Drop-In β οΈ εζ°εΎ ιͺθ―π Reference alternative (not in catalog)
ATSAM4S4BB-ANR
β Drop-In β οΈ εζ°εΎ ιͺθ―β In Stock
$5.01 / Unit
View Datasheet βATSAM4S8BB-ANR
β Drop-In β οΈ εζ°εΎ ιͺθ―π Reference alternative (not in catalog)
ATSAM3S4BA-AU
β Drop-Inπ Reference alternative (not in catalog)
ATSAM4S2BB-ANR Maximum Ratings & Electrical Characteristics
| Core | ARM Cortex-M4 |
| Data Bus Width | 32 bit |
| Maximum Clock Frequency | 120 MHz |
| Program Memory Size | 128 KB FLASH |
| Program Memory Type | Flash (ECC, Security Bit, Lock Bits) |
| SRAM Size | 64 KB |
| Supply Voltage Range | 1.62 V to 3.6 V |
| Backup Mode Power Consumption | 180 uA |
| DSP Instructions | Yes (Thumb-2, DSP extensions) |
| Memory Protection Unit | Yes (MPU) |
| USB | Full-Speed USB Device port with embedded transceiver |
| Package / Case | LQFP-64 (10 x 10 mm) |
| Mounting Style | SMD/SMT |
| Temperature Grade | Industrial |
| Terminal Form | Gull Wing |
| Number of Terminals | 64 |
| Series | SAM4S |
| RoHS | Compliant (Y) |
ATSAM4S2BB-ANR Pin Configuration
| Pin 1 | PA07 β Parallel I/O port A, pin 7 |
| Pin 2 | PA08 β Parallel I/O port A, pin 8 |
| Pin 3 | PA09 β Parallel I/O port A, pin 9 |
| Pin 4 | PA10 β Parallel I/O port A, pin 10 |
| Pin 5 | PA11 β Parallel I/O port A, pin 11 |
| Pin 6 | PA12 β Parallel I/O port A, pin 12 |
| Pin 7 | PA13 β Parallel I/O port A, pin 13 |
| Pin 8 | PA14 β Parallel I/O port A, pin 14 |
| Pin 9 | PA15 β Parallel I/O port A, pin 15 |
| Pin 10 | PA16 β Parallel I/O port A, pin 16 |
| Pin 11 | PA17 β Parallel I/O port A, pin 17 |
| Pin 12 | PA18 β Parallel I/O port A, pin 18 |
| Pin 13 | PA19 β Parallel I/O port A, pin 19 |
| Pin 14 | PA20 β Parallel I/O port A, pin 20 |
| Pin 15 | PA21 β Parallel I/O port A, pin 21 |
| Pin 16 | GND β Ground |
| Pin 17 | VDDIO β I/O power supply |
| Pin 18 | PA22 β Parallel I/O port A, pin 22 |
| Pin 19 | PA23 β Parallel I/O port A, pin 23 |
| Pin 20 | PA24 β Parallel I/O port A, pin 24 |
| Pin 21 | PA25 β Parallel I/O port A, pin 25 |
| Pin 22 | PA26 β Parallel I/O port A, pin 26 |
| Pin 23 | PA27 β Parallel I/O port A, pin 27 |
| Pin 24 | PA28 β Parallel I/O port A, pin 28 |
| Pin 25 | PA29 β Parallel I/O port A, pin 29 |
| Pin 26 | PA30 β Parallel I/O port A, pin 30 |
| Pin 27 | PA31 β Parallel I/O port A, pin 31 |
| Pin 28 | PB00 β Parallel I/O port B, pin 0 |
| Pin 29 | PB01 β Parallel I/O port B, pin 1 |
| Pin 30 | PB02 β Parallel I/O port B, pin 2 |
| Pin 31 | PB03 β Parallel I/O port B, pin 3 |
| Pin 32 | PB04 β Parallel I/O port B, pin 4 |
| Pin 33 | PB05 β Parallel I/O port B, pin 5 |
| Pin 34 | PB06 β Parallel I/O port B, pin 6 |
| Pin 35 | PB07 β Parallel I/O port B, pin 7 |
| Pin 36 | PB08 β Parallel I/O port B, pin 8 |
| Pin 37 | PB09 β Parallel I/O port B, pin 9 |
| Pin 38 | PB10 β Parallel I/O port B, pin 10 |
| Pin 39 | PB11 β Parallel I/O port B, pin 11 |
| Pin 40 | PB12 β Parallel I/O port B, pin 12 |
| Pin 41 | PB13 β Parallel I/O port B, pin 13 |
| Pin 42 | GND β Ground |
| Pin 43 | VDDIO β I/O power supply |
| Pin 44 | VDDBU β Backup power supply |
| Pin 45 | GNDBU β Backup ground |
| Pin 46 | XIN32 β 32.768 kHz crystal input |
| Pin 47 | XOUT32 β 32.768 kHz crystal output |
| Pin 48 | VDDANA β Analog power supply |
| Pin 49 | GNDANA β Analog ground |
| Pin 50 | AD0 β ADC channel 0 / I/O |
| Pin 51 | AD1 β ADC channel 1 / I/O |
| Pin 52 | AD2 β ADC channel 2 / I/O |
| Pin 53 | AD3 β ADC channel 3 / I/O |
| Pin 54 | XIN β Main crystal input |
| Pin 55 | XOUT β Main crystal output |
| Pin 56 | VDDPLL β PLL power supply |
| Pin 57 | VDDCORE β Core power supply (regulated) |
| Pin 58 | VDDOUT β Regulator output (external capacitor) |
| Pin 59 | VDDIN β Regulator input power supply |
| Pin 60 | ERASE β Flash bulk erase (active high) |
| Pin 61 | NRST β Bidirectional reset (open-drain) |
| Pin 62 | TEST β Test mode pin (tie to GND in application) |
| Pin 63 | TDO β JTAG test data output / SWO |
| Pin 64 | TDI β JTAG test data input |
Typical Applications
ATSAM4S2BB-ANR is suitable for 6 applications: Industrial Control and Automation, USB-Connected Embedded Devices, Metering and Battery-Backed Systems, Motor Control, Consumer Appliances, Legacy SAM7S/SAM3S Migration.
Industrial Control and Automation
The ATSAM4S2BB-ANR fits industrial control nodes because its 120 MHz Cortex-M4 core with DSP instructions executes PID control loops and digital filtering in real time, while the 12-bit ADC and PWM peripherals directly drive actuators and read sensors. USART, SPI and TWI interfaces connect PLC I/O modules, HMI panels and fieldbus transceivers over RS-485. The industrial temperature rating and Flash ECC ensure reliability in electrically noisy factory environments. Peripheral DMA channels move ADC and UART data without CPU load, keeping interrupt latency low for deterministic control. Its 1.62 V to 3.6 V operation simplifies integration on standard 3.3 V industrial logic rails.
Recommended
USB-Connected Embedded Devices
With its full-speed USB Device port and embedded transceiver, the ATSAM4S2BB-ANR implements USB HID, CDC, or vendor-specific classes without an external PHY, reducing BOM cost in PC-connected instruments, programmers and peripherals. The 120 MHz core sustains USB throughput while running the application stack, and 128 KB Flash accommodates the USB stack plus application code. VBUS sensing and the USB-specific power pins simplify bus-powered designs. Compared with external-PHY solutions, the embedded transceiver cuts board area in the 10 x 10 mm LQFP-64 footprint, and the Flash accelerator keeps code execution efficient during interrupt-driven USB transfers.
Recommended
Metering and Battery-Backed Systems
The ATSAM4S2BB-ANR suits energy and utility metering because the SAM4S2B consumes only 180 uA in backup mode per the Microchip product page, allowing the RTC and backup registers to run from a small battery between measurement cycles. The 12-bit ADC samples current and voltage channels, while DSP instructions perform FFT and RMS computation for power-quality metrics. Flash Security Bit and Lock Bits protect calibration data and billing firmware from tampering. The industrial temperature rating supports outdoor meter enclosures, and the RTC backup domain provides timestamping for load-profile logging on the 3.3 V supply.
Recommended
Motor Control
For motor control, the ATSAM4S2BB-ANR combines its PWM peripherals with the 120 MHz Cortex-M4 DSP extensions to implement field-oriented control (FOC) and space-vector modulation for BLDC and PMSM drives. The 12-bit ADC synchronized to PWM triggers samples phase currents at the switching midpoint, minimizing ripple error, and peripheral DMA transfers results without CPU intervention. Thumb-2 DSP instructions execute the Clarke/Park transforms and PI loops within a single PWM period. The industrial temperature package suits drive electronics mounted near motors, and 3.3 V logic interfaces directly to gate-driver ICs over the full 1.62 V to 3.6 V supply range.
Recommended
Consumer Appliances
Consumer appliance controllers benefit from the ATSAM4S2BB-ANR's balance of cost and performance: 128 KB Flash holds touch-decoding, display and communication firmware, while the 64 KB SRAM buffers graphics and protocol data. PWM outputs drive backlight, buzzer and fan control; the ADC reads buttons, temperature sensors (NTC) and mains-synchronization signals. The RoHS-compliant green LQFP-64 package meets consumer environmental requirements, and the Flash Lock Bits protect OEM firmware from cloning. UART and TWI connect to WiFi or BLE modules for smart-appliance connectivity, and the 120 MHz core leaves headroom for OTA firmware-update processing.
Recommended
Legacy SAM7S/SAM3S Migration
The ATSAM4S2BB-ANR is the designated migration target for legacy Atmel SAM7S and SAM3S designs: the SAM4S series datasheet explicitly documents pin-to-pin compatibility with SAM3N, SAM3S, SAM4N and SAM7S devices in 64-pin versions, so an existing PCB accepts the SAM4S2BB without layout changes. Designers gain the Cortex-M4 DSP instructions, Flash ECC, cache accelerator and USB Device port as drop-in benefits, typically doubling effective throughput at the same 120 MHz-class clocking. Because peripheral registers follow the same Atmel heritage, firmware ports are largely incremental, making the SAM4S2BB the lowest-risk upgrade path for end-of-life legacy stock.
Recommended
Recommended Products Summary
Engineering reference data for ATSAM4S2BB-ANR β comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | ATSAM4S2BA-AN | ATSAM4S2BB-AN | ATSAM4S4BB-ANR | ATSAM4S8BB-ANR | ATSAM3S4BA-AU |
|---|---|---|---|---|---|---|
| Package | LQFP-64 (10x10) | LQFP-64 (10x10) - same | LQFP-64 (10x10) - same | LQFP-64 (10x10) - same | LQFP-64 (10x10) - same | LQFP-64 (10x10) - same |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Core | ARM Cortex-M4 | ARM Cortex-M4 | ARM Cortex-M4 | ARM Cortex-M4 | ARM Cortex-M4 | ARM Cortex-M3 |
| Pin-to-Pin Compatible with SAM4S2BB | Reference | Yes | Yes | Yes | Yes | Yes (per SAM4S datasheet) |
Key Differentiators
- Lowest Flash in pin-compatible SAM4S LQFP-64 family - lowest cost (vs ATSAM4S8BB-ANR)
- Cortex-M4 DSP instructions vs Cortex-M3 predecessor (vs ATSAM3S4BA-AU)
- 180 uA backup mode for battery-backed designs (vs ATSAM4S4BB-ANR)
Design Notes
The SAM4S2B integrates an internal voltage regulator: connect VDDIN to the 3.3 V rail, place the required external capacitor on VDDOUT, and decouple VDDCORE locally per the SAM4S datasheet power section. Separate VDDPLL and VDDANA domains with individual 100 nF capacitors plus bulk decoupling, and connect GNDANA to a quiet analog ground star point for ADC accuracy. Estimated: at 3.3 V and typical active current in the tens of mA range, keep the regulator input within the 1.62 V to 3.6 V absolute range under all load transients.
The ERASE pin actively bulk-erases Flash when driven high - terminate it to ground (through a pulldown as recommended in the datasheet) to prevent accidental code loss from ESD or test-probe contact during production. Tie the TEST pin low in the application. NRST is open-drain and bidirectional: include an external pull-up and ensure external reset controllers do not drive it high. Verify the correct JTAG/SWD pin multiplexing before layout freeze, since PA-pin alternate functions must match your debugger.
Keep crystal circuits (XIN/XOUT and XIN32/XOUT32) with short traces, ground guarding, and load capacitors chosen from the crystal datasheet - Microchip's SAM4S application notes specify oscillator startup margins. Route USB D+/D- as a 90-ohm differential pair matched within a few mm to the LQFP-64 USB pins with a common-mode choke optional for EMI. Segregate the analog ADC channel traces from PWM and clock lines to preserve the 12-bit ADC noise floor. Provide at least a solid ground plane under the 10 x 10 mm LQFP-64 footprint.
Since the SAM4S series is pin-to-pin compatible with SAM3S/SAM4N/SAM7S 64-pin devices, design the PCB footprint to the generic LQFP-64 land pattern so future Flash-size upgrades (SAM4S4BB/SAM4S8BB) are solder-in replacements. Reserve the ERASE and NRST test points on the PCB for in-system programming and recovery, and expose SWD pins on a standard debug connector for Atmel-ICE or SAM-ICE programmers.
Compliance Information
RoHS: Y per omo-ic.com and Radwell distributor data; Mouser lists the part as LQFP GREEN industrial temp MRL B. REACH, halogen-free and conflict-minerals declarations should be confirmed on the Microchip product compliance page.
