ATSAM4LC4CA-AUR - 48MHz Cortex-M4 MCU 256KB Flash | Microchip
MPN： ATSAM4LC4CA-AUR ✓ 啟用中ATSAM4LC4CA-AUR 概覽
A microcontroller unit (MCU) is a single-chip computer integrating a processor core, memory, and peripherals on one die. The ATSAM4LC4CA belongs to the SAM4L family, which sits within the ARM Cortex-M class of 32-bit MCUs - the dominant architecture for embedded, low-power, and IoT designs. MCUs of this type replace multi-chip solutions, reducing board area, bill-of-materials cost, and system power consumption.
Key differentiating features include the Cortex-M4 core with DSP instructions, a hardware AES/DES cryptographic engine for secure applications, and the ultra-low-power peripheral event system that lets peripherals communicate without CPU intervention. The SAM4L power architecture supports multiple sleep modes with the Backup mode consuming the least, and programmable features such as a built-in buck converter on certain family members improve energy efficiency in battery-powered designs.
The SAM4L architecture pairs the 48 MHz Cortex-M4 with a multi-layer bus matrix and DMA controller, sustaining high peripheral throughput while the CPU sleeps. Flash memory with ECC protects against bit errors, and a rich peripheral set - USART, SPI, I2C (TWI), USB, ADC, DAC, PWM timers, and capacitive touch support (Peripheral Touch Controller) - enables single-chip designs for HMI, metering, and connectivity nodes. The PIC-style flexibility of clock sources (RCSYS, OSC0, DFLL, PLLs) allows dynamic frequency scaling to trade performance against current draw.
Typical applications include battery-powered sensor nodes, industrial control panels, consumer appliances, smart metering front ends, and touch-enabled user interfaces. The industrial temperature range of -40C to +85C and cryptographic acceleration suit metering and secure IoT endpoints, while low sleep current suits energy-harvesting and coin-cell products.
When designing with the ATSAM4LC4CA-AUR, budget the 100-TQFP thermal and decoupling requirements carefully: place 0.1 uF ceramic capacitors at every VDD/VDDIO pin pair and use solid ground planes. The R suffix indicates tape-and-reel packaging for automated assembly.
This page synthesizes distributor pricing from ten sources, drop-in SAM4L-family alternatives, pinout guidance, and design notes not found in the manufacturer datasheet alone.
直接替換替代品，適用於 ATSAM4LC4CA-AUR — 相同封裝，腳位對腳位相容。需重新設計 PCB 的不同封裝零件不列入。
此系列的變體
與下列產品可直接替換的同系列型號： ATSAM4LC4CA-AUR （相同外形與佔位） — 差異在於 RoHS Status, Supply Voltage, Operating Temperature, Package, Flash Memory.
ATSAM4LC8CA-AUR
✅ 直接替換 ⚠️ 規格未經驗證聯絡詢價
查看資料表 →ATSAM4LC2CA-AUR
✅ 直接替換 ⚠️ 規格未經驗證聯絡詢價
查看資料表 →ATSAM4LS4CA-AU
✅ 直接替換📋 參考替代品（不在目錄中）
ATSAM4LS2CA-AU
✅ 直接替換聯絡詢價
查看資料表 →ATSAM4LC4CA-AU
✅ 直接替換聯絡詢價
查看資料表 →ATSAM4LC4CA-AUR 最大額定值與電氣特性
| Core Processor | ARM Cortex-M4 |
| Core Size | 32-bit |
| 最大時脈頻率 | 48 MHz |
| Flash Memory | 256 KB (256K x 8) |
| 供應電壓 | 1.62 V to 3.6 V (1.8V/2.5V/3.3V operation) |
| Active Mode Current | 90 uA/MHz |
| Sleep Mode Current | 1.5 uA |
| Wake-up Time | down to 1.5 us |
| 工作溫度 | -40C to +85C (industrial) |
| 封裝 | 100-TQFP (14x14 mm) |
| 安裝類型 | Surface Mount |
| Security Features | AES, DES hardware cryptography |
| Communication Interfaces | USART, SPI, I2C (TWI), USB |
| Packaging | Tape & Reel (R suffix) |
ATSAM4LC4CA-AUR 100-tqfp (14x14 mm) 腳位配置指南
ATSAM4LC4CA-AUR（100-tqfp (14x14 mm) 封裝）的腳位配置。 此數位 IC 包含 GPIO、通訊介面（UART、SPI、I2C）與電源腳位。替代腳位功能與配置選項請參閱製造商資料表。對嵌入式系統設計與 PCB 佈局至關重要。
無詳細腳位定義資料： ATSAM4LC4CA-AUR.
請參閱 資料表 以查看完整腳位配置。
典型應用
ATSAM4LC4CA-AUR 適用於 6 應用s: Battery-Powered IoT Sensor Nodes, Smart Metering Front Ends, Capacitive Touch User Interfaces, Industrial Control and Automation Panels, Consumer Appliance Control Boards, Wearable and Portable Medical Devices.
Battery-Powered IoT Sensor Nodes
The ATSAM4LC4CA-AUR fits battery-powered sensor nodes because its 90 uA/MHz active current and 1.5 uA sleep current directly translate into multi-year coin-cell life. A node sampling a temperature sensor once per minute keeps the Cortex-M4 asleep 99% of the time; the 1.5 us wake-up means the CPU can service each event with no latency penalty, and the Peripheral Event System routes sensor interrupts to the ADC or timers without waking the core at all. Operating down to 1.62V allows direct connection to a lithium coin cell without a boost converter, removing a major efficiency loss. The integrated AES engine secures wireless payloads at negligible energy cost.
推薦
Smart Metering Front Ends
Metering designs select the ATSAM4LC4CA-AUR for its combination of industrial temperature rating (-40C to +85C), hardware AES/DES cryptographic engine, and low standby current - three requirements the utility meter environment imposes simultaneously. The 12-bit ADC samples voltage and current channels for energy calculations, while the 256 KB Flash stores tariff tables and calibration data. The crypto engine accelerates DLMS/COSEM message encryption without CPU overhead, and the long battery-backed operation from the 1.5 uA sleep mode keeps the RTC and tamper log alive during power outages. The 100-pin package supplies enough GPIO for relay control, LCD driving, and communication peripherals.
推薦
Capacitive Touch User Interfaces
The ATSAM4LC4CA-AUR integrates a Peripheral Touch Controller (PTC) that autonomously scans capacitive touch sensors while the CPU sleeps, making it a natural single-chip solution for touch buttons, sliders, and wheels on appliances and control panels. Because the PTC hardware handles charge-transfer measurement, wake-up from deep sleep occurs only when a genuine touch is detected, preserving the 1.5 uA standby figure in idle panels. The 100-pin TQFP exposes ample GPIO for LED feedback, buzzer drive, and serial links to a host. Firmware is accelerated by Microchip QTouch Library support, and the 48 MHz Cortex-M4 leaves headroom for gesture decoding and host communication concurrently.
推薦
Industrial Control and Automation Panels
In industrial control panels, the ATSAM4LC4CA-AUR provides deterministic Cortex-M4 processing at 48 MHz with the peripheral richness needed for machine I/O: multiple USARTs for Modbus RTU, SPI/TWI for isolated sensor interfaces, PWM timers for actuator control, and a DMA controller that moves data without CPU intervention. The industrial -40C to +85C rating covers unconditioned factory-floor enclosures, and the 256 KB Flash with ECC protects program memory against bit corruption in electrically noisy environments. The wake-up latency of 1.5 us allows aggressive duty-cycling of panels that are only intermittently active, reducing average power draw of always-on auxiliary systems.
推薦
Consumer Appliance Control Boards
Consumer appliances such as coffee machines, air conditioners, and dishwashers use the ATSAM4LC4CA-AUR to combine touch HMI, motor control, and connectivity in one MCU. The PTC eliminates a separate touch chip, the PWM timers drive BLDC or brushed motor stages, and the 256 KB Flash accommodates menus, localization strings, and communication stacks (e.g., UART-to-Wi-Fi module protocols). The 1.8V/2.5V/3.3V operation flexibility simplifies power-tree design from a single mains-derived rail, and the 90 uA/MHz efficiency matters for standby power regulations such as ErP. The green, RoHS-conscious TQFP package supports lead-free reflow assembly used in volume consumer manufacturing.
推薦
Wearable and Portable Medical Devices
Portable medical instruments - glucose meters, pulse oximeters, and vitals patches - choose the ATSAM4LC4CA-AUR for its favorable energy-per-operation: at 90 uA/MHz the Cortex-M4 executes signal-processing routines (IIR/FIR filtering, SpO2 algorithms) faster than 8-bit parts, spending less total energy per measurement. The 12-bit ADC and DAC support analog front-end sampling directly, and the fast 1.5 us wake-up supports event-driven sampling synchronized to patient activity. The hardware crypto engine helps satisfy data-protection expectations for stored patient records, while the 1.62V minimum supply allows operation from single lithium or dual alkaline cells. The 100-pin footprint leaves routing room for isolation and analog sections.
推薦
推薦產品摘要
工程參考資料，適用於 ATSAM4LC4CA-AUR — 比較、設計指引及合規資訊。
選型指南
與替代品比較
| 參數 | 本產品 | ATSAM4LC8CA-AUR | ATSAM4LC2CA-AUR | ATSAM4LS4CA-AU | ATSAM4LS2CA-AU |
|---|---|---|---|---|---|
| Package | 100-TQFP (14x14 mm) | 100-TQFP (14x14 mm) - same | 100-TQFP (14x14 mm) - same | 100-TQFP (14x14 mm) - same | 100-TQFP (14x14 mm) - same |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology (Atmel legacy) | Microchip Technology (Atmel legacy) |
| Core / Frequency | ARM Cortex-M4, 48 MHz | ARM Cortex-M4, 48 MHz | ARM Cortex-M4, 48 MHz | ARM Cortex-M4, 48 MHz | ARM Cortex-M4, 48 MHz |
| Flash Memory | 256 KB | 512 KB | 128 KB | 256 KB | 128 KB |
| Hardware Crypto Engine | AES, DES | AES, DES | AES, DES | No (lower static power focus) | No (lower static power focus) |
| Supply Voltage Range | 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 |
主要差異化特點
- Industry-leading low power for Cortex-M4 (對比ATSAM4LC8CA-AUR)
- Integrated AES/DES hardware cryptography (對比ATSAM4LS4CA-AU)
- Balanced memory tiering within one footprint (對比ATSAM4LC2CA-AUR)
設計說明
Decouple every VDD/VDDIO pin pair with a 100 nF ceramic capacitor placed within 2 mm of the pin, and add 10 uF bulk capacitance near the supply entry. The SAM4L supports 1.8V/2.5V/3.3V operation; if the design must survive battery brown-out, verify the 1.62V minimum supply and configure the brown-out detector (BOD) and supply-fail reset accordingly. Estimated: a node spending 10 ms at 48 MHz (4.3 mA) and 990 ms asleep (1.5 uA) draws an average of roughly 44 uA, giving about 5300 hours on a 240 mAh CR2032 cell.
The 100-TQFP (0.5 mm pitch) requires careful pad geometry per IPC-SM-782-style land patterns; use a 0.5 mm pitch stencil with 0.25x1.5 mm apertures to avoid bridging. Route the VDDCORE supply per the datasheet recommendation, keep analog (ADC/DAC) ground returns on a quiet region of the ground plane away from switching loads, and place the USB/USART series termination resistors close to the MCU. Under the exposed die region no thermal pad is present on TQFP, so thermal relief is handled entirely through the leads - adequate for the SAM4L low-power budget.
Do not migrate firmware from LC8/LS parts to the ATSAM4LC4CA without checking linker Flash and SRAM limits - the 256 KB Flash boundary fails silently at link time only if the map is reviewed. The clock system defaults to the internal RCSYS oscillator after reset; projects assuming an external crystal or PLL must explicitly configure OSC0/DFLL/PLL startup and failure detection, otherwise timing-sensitive peripherals (USART baud, USB) will malfunction. Finally, the crypto engine key registers are write-only - back up keys externally before any debug erase.
合規資訊
Mouser listing describes the package as Green, indicating Microchip's lead-free/halogen-free green packaging program, but explicit RoHS/REACH certificates were not present in the provided data - verify via the Microchip product page Environmental data.
