ATSAM4LS2BA-MU - 48MHz Cortex-M4 MCU 128KB Flash | Microchip
MPN: ATSAM4LS2BA-MU ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $5.86 | $5.86 |
| 10 | $5.27 | $52.70 |
| 100 | $4.69 | $469.00 |
| 500 | $4.22 | $2,110.00 |
| 1,000 | $3.79 | $3,790.00 |
ATSAM4LS2BA-MU Overview
A microcontroller unit (MCU) is a single-chip embedded computer that combines a processor core, memory, and peripherals into one integrated circuit. Within the embedded systems hierarchy, the SAM4L sits in the mainstream ARM Cortex-M class of flash microcontrollers, positioned above entry-level Cortex-M0+ devices and below high-performance Cortex-M7 parts. MCUs are the building blocks of modern embedded electronics, from consumer devices to industrial automation controllers.
Key differentiating features include the 48 MHz ARM Cortex-M4 core with DSP instructions, 128KB of single-cycle Flash program memory, 32KB of SRAM, and the picoPower technology platform that enables microamp-level sleep currents. Peripherals typically include USART, SPI, I2C (TWI) interfaces, an ADC, timers, and a USB-capable architecture, allowing a single chip to handle sensing, control, and communication duties in one package.
Technically, the SAM4L series is built around the Atmel (now Microchip) low-power flash process with an ARMv7E-M based core supporting hardware multiply and digital signal processing instructions. The peripheral event system allows peripherals to communicate directly without CPU intervention, further reducing active power consumption. Multiple sleep modes with state retention let designers trade wake-up latency against standby current to match application power budgets.
Typical applications include battery-powered industrial sensors and meters, portable medical monitoring devices, low-power human interface and touch sensing products, and general-purpose industrial control boards where a 3.3V, 48MHz controller with generous Flash is required.
When designing with this device, budget the 9x9 mm VQFN exposed pad for good ground and thermal connection to the PCB, and validate the industrial temperature rating against your worst-case enclosure conditions.
This page adds value beyond the datasheet by consolidating distributor pricing, drop-in family alternatives, comparison tables, and practical design notes in one AI-citable reference.
Drop-in alternatives for ATSAM4LS2BA-MU — 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 ATSAM4LS2BA-MU (same form factor and footprint) — differing in RoHS Status, Package, Supply Voltage, Flash Memory, Core Processor.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
ATSAM4LS2BA-MUR
✅ Drop-In✓ In Stock
$5.4 / Unit
View Datasheet →ATSAM4LS4BA-MU
✅ Drop-In✓ In Stock
$1.85 / Unit
View Datasheet →ATSAM4LS8BA-MU
✅ Drop-In ⚠️ 参数待验证✓ In Stock
$1.02 / Unit
View Datasheet →ATSAM4LC2BA-MU
✅ Drop-In ⚠️ 参数待验证📋 Reference alternative (not in catalog)
ATSAM4LC4BA-MU
✅ Drop-In ⚠️ 参数待验证✓ In Stock
$1 / Unit
View Datasheet →ATSAM3N2BA-MU
✅ Drop-In✓ In Stock
$3.25 / Unit
View Datasheet →ATSAM4LS2BA-MU Maximum Ratings & Electrical Characteristics
| Core Processor | ARM Cortex-M4 |
| Core Size | 32-bit |
| Maximum Clock Speed | 48 MHz |
| Flash Memory | 128KB (128K x 8) |
| SRAM | 32KB |
| Supply Voltage | 1.8V / 3.3V |
| Series | SAM4L |
| Number of Pins | 64 |
| Package | 64-VQFN (9x9 mm) Exposed Pad |
| Mounting Type | Surface Mount |
| Operating Temperature | Industrial (-40C to +85C) |
| Low Power Technology | picoPower |
| Package Code (JEDEC style) | HVQCCN, square, no-lead |
| Packaging Method | Tray |
| RoHS Status | Green / RoHS compliant per Mouser listing |
| Connectivity Interfaces | USART, SPI, I2C (per SAM4L family) |
ATSAM4LS2BA-MU hvqccn, square, no-lead Pin Configuration Guide
Pin configuration for ATSAM4LS2BA-MU (hvqccn, square, no-lead 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 ATSAM4LS2BA-MU.
Refer to the datasheet for full pin configuration.
Typical Applications
ATSAM4LS2BA-MU is suitable for 6 applications: Battery-Powered Industrial Metering, Industrial Sensor Nodes, Portable Medical Monitoring, Touch Sensing Human Interface, Building Automation Controllers, Handheld Test and Measurement Instruments.
Battery-Powered Industrial Metering
The ATSAM4LS2BA-MU fits battery-powered electricity, water, and gas meters where a 10+ year service life demands ultra-low average current. The SAM4L picoPower platform enables deep sleep modes with state retention, so the MCU spends most of its life in microamp-level standby and wakes the 48 MHz Cortex-M4 only for metering computation and communication bursts. The 128KB Flash holds metrology firmware plus communication stacks, while the 32KB SRAM buffers tariff tables and event logs. A 3.3V coin cell or primary lithium cell powers the device directly within the 1.8V to 3.3V operating range, and the peripheral event system permits sensor sampling without CPU wake, extending battery life further.
Recommended
Industrial Sensor Nodes
Distributed factory and process sensor nodes benefit from the ATSAM4LS2BA-MU combination of industrial temperature rating (-40C to +85C), a Cortex-M4 core with DSP instructions for digital filtering of raw sensor data, and generous 128KB Flash for protocol stacks such as Modbus or custom RS-485 layers. The integrated USART, SPI, and I2C interfaces connect directly to ADCs, temperature sensors, and transceivers without external glue logic. Because sleep currents are microamp-level thanks to picoPower technology, nodes can run from loop power or small backup batteries. The 64-pin QFN exposed pad provides a solid ground reference that improves ADC noise performance in electrically noisy industrial cabinets.
Recommended
Portable Medical Monitoring
Wearable and portable medical monitors require low power, a small 9x9 mm footprint, and sufficient compute for signal processing - all delivered by the ATSAM4LS2BA-MU. The 48 MHz Cortex-M4 with hardware multiply executes FIR/IIR filtering and basic feature extraction on ECG, SpO2, or motion data locally, reducing radio transmissions and conserving the battery. The 1.8V supply capability matches modern sensor front-ends, and picoPower sleep modes sustain multi-day to multi-week operation from rechargeable cells. Designers should place the exposed pad over a clean ground plane to minimize analog noise, and validate the industrial temperature rating against body-adjacent enclosure temperatures during regulatory testing.
Recommended
Touch Sensing Human Interface
The SAM4L family is widely used in capacitive touch keys, sliders, and wheels, and the ATSAM4LS2BA-MU's 64-pin package supplies abundant GPIO for multi-button panels. The Cortex-M4 core executes charge-transfer touch acquisition and decision algorithms with ample timing margin at 48 MHz, while picoPower modes keep panels responsive with minimal idle current in always-on appliances and white goods. The 128KB Flash accommodates the touch library plus application firmware, haptic feedback control, and LED backlight logic in a single chip. The industrial temperature rating suits kitchen and outdoor terminals, and the exposed-pad QFN simplifies grounding the touch electrode reference for stable, drift-free sensing.
Recommended
Building Automation Controllers
Room controllers, damper actuators, and occupancy sensors use the ATSAM4LS2BA-MU to bridge sensor inputs and actuator outputs over RS-485/USART or I2C networks. The 48 MHz Cortex-M4 runs PID control loops deterministically, and 128KB Flash holds the control firmware plus a lightweight network protocol implementation. Wide 1.8V to 3.3V supply tolerance eases integration with bus-powered designs, and the -40C to +85C industrial rating covers rooftop and mechanical-room installations. Deep sleep between control cycles keeps bus-powered nodes within budget, while the peripheral event system handles routine timing and communication handshakes without waking the CPU, trimming average consumption in continuously powered controllers.
Recommended
Handheld Test and Measurement Instruments
Handheld multimeters, environmental meters, and portable diagnostics tools leverage the ATSAM4LS2BA-MU's balance of DSP-capable compute, low quiescent drain, and 64-pin connectivity to displays, keypads, and measurement front-ends. The Cortex-M4 core processes ADC streams at 48 MHz for RMS computation and waveform analysis, while the 32KB SRAM buffers waveform captures for on-screen review. Multi-week battery life comes from picoPower sleep between measurements - a decisive advantage over always-on controller solutions. The 9x9 mm VQFN keeps the main board compact for ergonomic enclosures, and the exposed thermal pad grounds the analog section cleanly, reducing display and measurement noise coupling in precision portable instruments.
Recommended
Recommended Products Summary
Engineering reference data for ATSAM4LS2BA-MU — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | ATSAM4LS2BA-MUR | ATSAM4LS4BA-MU | ATSAM4LC2BA-MU | ATSAM3N2BA-MU |
|---|---|---|---|---|---|
| Package | 64-QFN (9x9 mm) Exposed Pad | 64-QFN (9x9 mm) EP - same | 64-QFN (9x9 mm) EP - same | 64-QFN (9x9 mm) EP - same | 64-QFN (9x9 mm) EP - same |
| Brand | Microchip Technology (Atmel) | Microchip Technology (Atmel) | Microchip Technology (Atmel) | Microchip Technology (Atmel) | Microchip Technology (Atmel) |
| Core | ARM Cortex-M4, 32-bit | ARM Cortex-M4 | ARM Cortex-M4 | ARM Cortex-M4 | ARM Cortex-M3 |
| Flash Memory | 128KB | 128KB | 256KB | 128KB | 128KB |
| picoPower Low-Power Technology | Yes | Yes | Yes | Yes | No |
| Security / Crypto Accelerator | No | No | No | Yes (AES) | No |
| Packaging Format | Tray | Tape & Reel | Tray | Tray | Tray |
Key Differentiators
- Cortex-M4 with DSP instructions at equal cost position (vs ATSAM3N2BA-MU)
- picoPower ultra-low-power platform (vs ATSAM3N2BA-MU)
- Pin-compatible Flash upgrade path (vs ATSAM4LS4BA-MU)
Design Notes
The 64-pin VQFN exposed pad is the primary ground and thermal connection. Create a via array (typically 5x5 or similar grid) under the exposed pad tied to a solid internal ground plane. All 64 no-lead perimeter pins need accurately scaled land patterns per the manufacturer's mechanical drawing - QFN pads are solder-mask defined or non-solder-mask defined per Microchip recommendation, and paste apertures should be slightly inset on perimeter pins to prevent bridging on the 0.5 mm pitch leads.
Design the supply for the 1.8V/3.3V operating points stated in the verified data. Decouple each VDD/VDDIO pin pair with 100 nF ceramics placed within a few millimeters of the pins, plus bulk capacitance near the regulator. If battery powered, exploit the SAM4L picoPower sleep modes: budget average current from the datasheet sleep-mode figures rather than active-mode 48 MHz numbers, since duty cycle dominates battery life. Verify brown-out detector settings against your supply slew rate at cold temperature.
Cortex-M4 DSP instructions are only available when compiling with the correct core selection; code built for Cortex-M3 (e.g., ported from ATSAM3N2BA-MU) will run but leave the multiply/DSP performance unused. Second, flash density differs across the pin-compatible family (128KB/256KB/512KB): linker scripts and bootloader image size checks must be updated when swapping in ATSAM4LS4BA-MU or higher variants, or firmware may silently truncate. Finally, confirm programming via the SWD interface and device ID at incoming inspection when second-sourcing within the family.
Compliance Information
Mouser listing describes the part as 'QFN, GREEN, IND TEMP MRL A', indicating green/RoHS-compliant packaging. Full REACH and conflict-minerals declarations should be requested from Microchip.
