ATSAM4S8CB-CFNR - 120MHz Cortex-M4 MCU, 512KB Flash, VFBGA-100 | Microchip
MPN: ATSAM4S8CB-CFNR ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $9.95 | $9.95 |
| 10 | $9.05 | $90.50 |
| 100 | $8.15 | $815.00 |
| 500 | $7.45 | $3,725.00 |
| 1,000 | $6.85 | $6,850.00 |
ATSAM4S8CB-CFNR Overview
An ARM Cortex-M4 microcontroller is a 32-bit RISC processor core based on the ARMv7-M architecture, featuring single-cycle DSP instructions, a single-precision floating-point unit (FPU) in many variants, and a nested vector interrupt controller (NVIC). The Cortex-M4 family is the standard mainstream MCU core for industrial, IoT, and motor-control designs, sitting between the Cortex-M0+ (ultra-low power) and Cortex-M7 (high-end DSP) tiers. SAM4S devices specifically target applications that previously used the SAM7S, SAM3N, and SAM3S families, offering pin-to-pin compatibility with those older designs to enable drop-in upgrades.
Key features of the ATSAM4S8CB-CFNR include a 120 MHz maximum CPU clock with a Memory Protection Unit (MPU), 512 KB embedded Flash with 16 KB additional Flash for user signature, 128 KB SRAM with single-cycle access at full bus speed, and a high-speed Multi-bit ECC block for Flash integrity. The peripheral set includes a USB 2.0 Full-Speed Device with on-chip transceiver, a CAN 2.0A/B controller, up to five USART/UART channels, three TWI (I2C-compatible) ports, three SPI controllers, a 10-bit ADC with up to 16 channels and 1 MSPS conversion rate, a 12-bit DAC, and a 16-bit timer/counter block. The integrated SleepWalking peripheral event system reduces wake-up latency by allowing peripherals to wake the CPU autonomously only when needed.
Architecturally, the SAM4S series uses a 90 nm low-power CMOS process with an on-chip 3.3V core supply generated by an embedded voltage regulator from a single 1.62V to 3.6V external supply. Power consumption is approximately 0.5 mA/MHz active at 1.62V, with multiple low-power modes (Sleep, Wait, Backup) drawing single-digit microamps. The 120 MHz Cortex-M4 delivers 1.26 DMIPS/MHz, putting it ahead of Cortex-M3 and Cortex-M0+ devices for computationally intensive tasks such as motor control, audio processing, and protocol stacks.
Typical applications include industrial automation controllers, building automation gateways, smart energy metering, USB peripherals and HID devices, automotive body and infotainment subsystems, motor control drives (BLDC, PMSM, stepper), graphical user interface boards with TFT displays, and portable medical instruments. The combination of Cortex-M4 DSP instructions, hardware FPU, USB, CAN, and high-resolution timers makes the SAM4S particularly well-suited to real-time control loops and human-machine interface systems. The 100-pin BGA package reduces PCB footprint in space-constrained designs but requires careful routing and reflow profiling.
When designing with this device, pay attention to the BGA land pattern: the 7x7 mm VFBGA uses 0.5 mm pitch balls, which require microvia PCB technology for inner-layer fan-out and proper solder paste stencil aperture design to mitigate tombstoning. Decoupling the VDDIO and VDDCORE pins with 100 nF ceramic capacitors placed within 2 mm of each ball, and providing a bulk 4.7 uF capacitor on VDDIN, are essential for stable operation across the industrial temperature range.
This page synthesizes distributor pricing for the ATSAM4S8CB-CFNR, pin-compatible SAM4S family variants, drop-in alternatives, and practical BGA PCB design notes not consolidated in the manufacturer datasheet alone.
Drop-in alternatives for ATSAM4S8CB-CFNR — 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 ATSAM4S8CB-CFNR (same form factor and footprint) — differing in ADC, Package, USB, Core Architecture, MSL Level.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
ATSAM4S8CA-CFUR
✅ Drop-In ⚠️ 参数待验证✓ In Stock
$3.95 / Unit
View Datasheet →ATSAM4S8CA-CFN
✅ Drop-In ⚠️ 参数待验证✓ In Stock
$4.8 / Unit
View Datasheet →ATSAM4S8CA-CFU
✅ Drop-In ⚠️ 参数待验证✓ In Stock
$5.2 / Unit
View Datasheet →ATSAM4S8CB-CFN
✅ Drop-In ⚠️ 参数待验证✓ In Stock
$4.74 / Unit
View Datasheet →ATSAM4S16CB-CFN
✅ Drop-In✓ In Stock
$4.95 / Unit
View Datasheet →ATSAM4S8CA-AU
✅ Drop-In ⚠️ 参数待验证✓ In Stock
$5.74 / Unit
View Datasheet →ATSAM4S8CB-CFNR Maximum Ratings & Electrical Characteristics
| Core Architecture | ARM Cortex-M4 (ARMv7-M) |
| Maximum CPU Clock | 120 MHz |
| Performance | 1.26 DMIPS/MHz |
| Program Memory (Flash) | 512 KB (512K x 8) |
| Data Memory (SRAM) | 128 KB |
| Package | 100-VFBGA (7x7 mm), 0.5 mm pitch |
| Supply Voltage (VDDIN) | 1.62 V to 3.6 V |
| Operating Temperature | -40 C to +85 C (Industrial) |
| ADC | 10-bit, up to 16 channels, 1 MSPS |
| DAC | 12-bit, 1 channel |
| USB | USB 2.0 Full-Speed Device, on-chip transceiver |
| CAN | 1x CAN 2.0A/B controller |
| UART/USART | Up to 5 channels |
| SPI | Up to 3 controllers |
| I2C (TWI) | Up to 3 channels |
| Timers | 16-bit TC channels, 32-bit RTC |
| Memory Protection | MPU (8 regions) |
| RoHS Status | Compliant |
| Mounting Type | Surface Mount (BGA) |
ATSAM4S8CB-CFNR 100-vfbga (7x7 mm), 0.5 mm pitch Pin Configuration Guide
Pin configuration for ATSAM4S8CB-CFNR (100-vfbga (7x7 mm), 0.5 mm pitch 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 ATSAM4S8CB-CFNR.
Refer to the datasheet for full pin configuration.
Typical Applications
ATSAM4S8CB-CFNR is suitable for 7 applications: Industrial Automation Controllers, USB Peripherals and HID Devices, BLDC and PMSM Motor Control Drives, Smart Energy Meters and AMI Gateways, Building Automation and HVAC Controllers, Portable Medical Instruments, HMI Boards with TFT Displays.
Industrial Automation Controllers
The ATSAM4S8CB-CFNR's 120 MHz Cortex-M4 core with single-precision FPU and DSP instructions handles multi-axis PID control loops and fieldbus protocol stacks in industrial automation. Its 512 KB Flash accommodates full Modbus/TCP, EtherCAT slave, or PROFINET firmware, while 128 KB SRAM supports real-time data buffering without external memory. The integrated CAN 2.0A/B controller and five USART channels connect directly to sensor hubs and motor drivers, reducing BOM. Industrial -40C to +85C rating plus integrated voltage regulator on a single 3.3V rail simplifies power-supply design for DIN-rail mounted controllers.
Recommended
USB Peripherals and HID Devices
The integrated USB 2.0 Full-Speed device controller with on-chip transceiver eliminates external PHY components in USB peripherals built on the ATSAM4S8CB-CFNR. The 120 MHz Cortex-M4 core processes HID report generation, custom vendor-class protocols, and composite USB device stacks in firmware, while 512 KB Flash fits full USB stacks plus application logic. Designers can implement keyboards, mice, custom HID input devices, vendor-class data loggers, or CDC+MSC composite storage units on this single chip. The 100-ball VFBGA package supports compact dongle-style form factors where PCB real-estate is critical.
Recommended
BLDC and PMSM Motor Control Drives
The ATSAM4S8CB-CFNR is purpose-built for BLDC, PMSM, and AC induction motor control, with three 16-bit timer/counter channels providing complementary PWM outputs with dead-time insertion and hardware fault shutdown. The Cortex-M4 DSP instructions execute field-oriented control (FOC) and space-vector modulation algorithms in single-cycle hardware, while the single-precision FPU accelerates Park/Clarke transforms at full 120 MHz. The high-speed 10-bit ADC with 1 MSPS conversion rate and up to 16 channels samples phase currents synchronously to PWM, enabling sensorless control via BEMF or FOC with Hall/encoder feedback.
Recommended
Smart Energy Meters and AMI Gateways
In smart energy metering and AMI gateway designs, the ATSAM4S8CB-CFNR's 128 KB SRAM buffers measurement samples from the ADC while the 120 MHz Cortex-M4 runs IEC 62053-22/23 class 0.2 metering algorithms, FFT harmonic analysis, and DLMS/COSEM protocol stacks concurrently. The integrated RTC with calendar function tracks time-of-use tariff schedules, while multiple USART channels interface to PLC modems and M-Bus/RS-485 communication links. Industrial temperature rating supports outdoor cabinet environments, and the low-power SleepWalking peripherals wake the MCU only on tariff-change or communication events to minimize standby power consumption.
Recommended
Building Automation and HVAC Controllers
Building automation and HVAC controllers benefit from the ATSAM4S8CB-CFNR's rich connectivity: USB for service-port diagnostics, CAN for elevator and楼宇 inter-floor networking, and multiple UARTs for RS-485 Modbus integration with sensors and actuators. The 100-pin BGA package fits behind compact wall-mount touchscreens, and 512 KB Flash runs full BACnet or KNX stack plus scheduling and PID firmware. Low-power modes with SleepWalking peripherals keep idle HVAC thermostats drawing single-digit milliamps while still responding to schedule events and remote commands over building networks.
Recommended
Portable Medical Instruments
Portable medical instruments such as pulse oximeters, glucose meters, and handheld ultrasound probes use the ATSAM4S8CB-CFNR for its low-power Cortex-M4 DSP performance and integrated analog peripherals. The 12-bit DAC drives audio or stimulation waveforms, the 10-bit 1 MSPS ADC acquires bioelectric signals (ECG, EMG), and the FPU accelerates filtering algorithms in firmware. 512 KB Flash accommodates full protocol stacks (BLE HCI through external transceiver, USB CDC for charging/data), while 128 KB SRAM buffers sample streams. Industrial temperature rating and the embedded voltage regulator support battery-powered operation from a single Li-ion cell.
Recommended
HMI Boards with TFT Displays
Human-machine interface boards with TFT LCDs and resistive/capacitive touchscreens pair naturally with the ATSAM4S8CB-CFNR, leveraging the 120 MHz Cortex-M4 for graphics rendering, touch event handling, and animation. The integrated TFT LCD controller (in supported SAM4S variants) drives QVGA/WQVGA panels directly without an external graphics controller, while 128 KB SRAM holds frame buffers and fonts. The 100-pin BGA footprint fits slim-panel-mount designs, and the SleepWalking peripheral event system keeps touchscreen wake latency low while standby power consumption stays under 10 mA for energy-conscious HMI products.
Recommended
Recommended Products Summary
Engineering reference data for ATSAM4S8CB-CFNR — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | ATSAM4S8CA-CFUR | ATSAM4S8CA-CFN | ATSAM4S8CA-CFU | ATSAM4S8CB-CFN | ATSAM4S16CB-CFN | ATSAM4S8CA-AU |
|---|---|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 100-VFBGA (7x7 mm) | 100-VFBGA (7x7 mm) - same | 100-VFBGA (7x7 mm) - same | 100-VFBGA (7x7 mm) - same | 100-VFBGA (7x7 mm) - same | 100-VFBGA (7x7 mm) - same | 100-VFBGA (7x7 mm) - same |
| Core | ARM Cortex-M4 | ARM Cortex-M4 | ARM Cortex-M4 | ARM Cortex-M4 | ARM Cortex-M4 | ARM Cortex-M4 | ARM Cortex-M4 |
| Maximum CPU Clock | 120 MHz | 120 MHz | 120 MHz | 120 MHz | 120 MHz | 120 MHz | 120 MHz |
| Flash | 512 KB | 512 KB | 512 KB | 512 KB | 512 KB | 1024 KB | 512 KB |
| SRAM | 128 KB | 128 KB | 128 KB | 128 KB | 128 KB | 128 KB | 128 KB |
| Operating Temperature | -40C to +85C (Industrial) | -40C to +85C (Industrial) | -40C to +85C (Industrial) | -40C to +85C (Industrial) | -40C to +85C (Industrial) | -40C to +85C (Industrial) | Automotive grade |
| 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 |
| USB | USB 2.0 FS Device + on-chip PHY | USB 2.0 FS Device + on-chip PHY | USB 2.0 FS Device + on-chip PHY | USB 2.0 FS Device + on-chip PHY | USB 2.0 FS Device + on-chip PHY | USB 2.0 FS Device + on-chip PHY | USB 2.0 FS Device + on-chip PHY |
Key Differentiators
- Highest-density 100-pin BGA SAM4S variant at 512 KB Flash + 128 KB SRAM + 120 MHz Cortex-M4 (vs ATSAM4S4CB-CNR (256 KB Flash variant))
- Drop-in upgrade for legacy SAM3N/SAM3S/SAM7S designs (vs ATSAM3N4C Cortex-M3 predecessor)
- 1 MB Flash option available in same package for code growth headroom (vs ATSAM4S16CB-CFN (1 MB Flash))
- Integrated USB 2.0 Full-Speed with on-chip PHY eliminates external USB components (vs STM32F407 Cortex-M4 with external USB PHY requirement)
Design Notes
The 100-ball VFBGA uses 0.5 mm pitch, which requires microvia PCB technology (laser-drilled or stacked) for inner-layer fan-out. Use a 4-layer or 6-layer stackup with the top layer dedicated to BGA breakout; route signals on inner layers only after via-in-pad or dog-bone fan-out clears the package perimeter. The solder paste stencil should use 0.4 mm aperture pads with rounded corners (NOT square) to mitigate solder-ball bridging during reflow, and reflow profile should follow the JEDEC J-STD-020 MSL-3 profile at peak 245C +/- 5C.
Decoupling is critical for the SAM4S internal voltage regulator. Place a 100 nF X7R ceramic capacitor within 2 mm of every VDDCORE ball (typically 4 balls) and within 2 mm of every VDDIO ball (typically 6-8 balls). Add a single 4.7 uF X5R bulk capacitor on VDDIN close to the package, plus a 10 uF bulk on the external 3.3V rail input. Estimated: with all peripherals enabled and 120 MHz clock, the SAM4S VDDIN current can reach 60-80 mA active, falling to single-digit mA in Wait mode and sub-10 uA in Backup mode with RTC running.
Do not confuse the ATSAM4S8CB-CFNR with the ATSAM3S or ATSAM4S16 variants when ordering - the part-number suffix 'S8' means 512 KB Flash, 'S16' means 1 MB Flash, and the 'CFN' suffix specifies the 100-pin VFBGA industrial grade. The 'R' at the end indicates Tape & Reel; without 'R' the part ships in Tray. Programming/debug access requires a SWD header on TMS, TCK, TDI, TDO, and NRST balls - omit the JTAG TDO ball only if your tool supports SWD-only mode to free a GPIO.
The 100-ball 7x7 mm VFBGA has a theta_JA in the 30-40 C/W range on a 4-layer JEDEC test board, which is acceptable for industrial -40C to +85C operation under typical SAM4S active currents (60-80 mA at 3.3V). Estimated: at full 120 MHz CPU load, the SAM4S internal power dissipation is approximately 200-250 mW, well within the package's thermal limits. If your application forces sustained high peripheral activity plus USB enumeration, add thermal vias under the center ground balls to spread heat into the inner copper planes.
Compliance Information
RoHS and REACH compliant per Microchip product declaration. Not AEC-Q100 qualified - choose ATSAM4S8CA-AU automotive-grade variant for in-vehicle applications. Halogen-free status not explicitly published in available distributor data.
