ATSAML21J17B-UUT - 128KB Flash 48MHz ARM Cortex-M0+ MCU | Microchip
料号： ATSAML21J17B-UUT ✓ 量产中| 数量 | 单价 | 小计 |
|---|---|---|
| 1 | $3.57 | $3.57 |
| 10 | $3.21 | $32.10 |
| 100 | $2.74 | $274.00 |
| 500 | $2.41 | $1,205.00 |
| 1,000 | $2.18 | $2,180.00 |
ATSAML21J17B-UUT 概述
A microcontroller (MCU) is a single-chip computer that integrates a CPU core, program memory (Flash), working memory (SRAM), and a rich set of peripherals. The ARM Cortex-M0+ is the smallest and most energy-efficient core in the Cortex-M family, optimized for low-power deterministic embedded control. Within Microchip's portfolio, this device sits in the hierarchy: Cortex-M0+ core -> ARM 32-bit MCU -> SAM L21 ultra-low-power family -> Functional Safety (FuSa) product line -> embedded microcontroller. Its combination of Cortex-M0+ simplicity with SleepWalking, power domain gating, and ultra-low-power peripherals targets always-on, battery-powered applications.
Key features of the ATSAML21J17B-UUT include 128 KB Flash, 16 KB SRAM, an ARM Cortex-M0+ core at 48 MHz (2.46 CoreMark/MHz), full-speed USB device support, a 12-bit 1 Msps ADC, up to five SERCOM channels, a 32-bit RTC, and PTC (Peripheral Touch Controller) for capacitive touch sensing. The WLCSP64 package enables compact PCB designs, while the integrated power management supports SleepWalking, deep sleep, backup, and standby modes. Functional Safety (FuSa) features assist in safety-critical designs.
Architecturally, the SAM L21 family uses a sophisticated power-domain gating scheme that selectively powers only the peripherals in use. This, combined with the Cortex-M0+ two-stage pipeline and the Wake-on-event interrupt controller, minimizes wake-up latency while keeping idle current at 200 nA. The integrated 12-bit DAC, multiple timer/counter channels, and event system allow complex signal routing without CPU intervention.
Typical applications include wearable fitness and health devices, battery-powered IoT sensors, smart metering, home automation, remote controls, and ultra-low-power wireless sensor nodes. It is also used in industrial IoT edge nodes where long battery life and a small footprint (WLCSP64) are both essential.
When designing with this MCU, designers should pay attention to decoupling (place 100 nF X7R capacitors near each VDD pin), I/O bank voltage reference requirements for analog accuracy, and the need to configure unused pins as outputs with defined levels to minimize leakage. The WLCSP package also demands careful PCB pad design and assembly process control.
This page synthesizes distributor pricing, drop-in alternatives drawn from the same SAM L21 family, and practical design notes not found in the manufacturer datasheet, providing engineers a one-stop reference for sourcing the ATSAML21J17B-UUT.
直接替换替代料： ATSAML21J17B-UUT ——相同封装，引脚兼容。需要 PCB 改动的不同封装料号已排除。
本系列中的变体
可与以下型号直接替换的同系列型号： ATSAML21J17B-UUT （相同外形与封装尺寸） ——差异在于 ADC, Mounting Type, Package, SRAM, Active Current.
快速对比工具——选择替代料号进行并排对比：
ATSAML21J18B-UUT
✅ 直接替换 ⚠️ 规格未核验✓ 有现货
$3.78 / 个
查看数据手册 →ATSAML21J16B-UUT
✅ 直接替换 ⚠️ 规格未核验📋 参考替代料（不在目录中）
ATSAML21E16B-UUT
✅ 直接替换 ⚠️ 规格未核验📋 参考替代料（不在目录中）
ATSAMD21J17B-UUT
✅ 直接替换📋 参考替代料（不在目录中）
ATSAML11E16A-UUT
✅ 直接替换📋 参考替代料（不在目录中）
ATSAML21J17B-UUT 最大额定值与电气特性
| Core | ARM Cortex-M0+ (32-bit, single-core) |
| 最大时钟频率 | 48 MHz |
| Flash Memory | 128 KB |
| SRAM | 16 KB |
| Supply Voltage (VDD) | 1.6 V to 3.6 V |
| Active Current | 35 uA/MHz (typical) |
| Sleep Current | 200 nA (typical) |
| 工作温度 | -40C to +85C (industrial) |
| 封装 | 64-ball WLCSP (3.58 x 3.28 mm) |
| 安装类型 | Surface Mount |
| ADC | 12-bit, up to 1 Msps |
| USB | Full-Speed USB Device |
| Touch Controller | PTC (Peripheral Touch Controller) |
| Functional Safety | FuSa features supported |
| RoHS 状态 | Compliant (Green) |
ATSAML21J17B-UUT 64-ball wlcsp (3.58 x 3.28 mm) 引脚配置指南
ATSAML21J17B-UUT（64-ball wlcsp (3.58 x 3.28 mm) 封装）的引脚配置。 该数字 IC 包含 GPIO、通信接口（UART、SPI、I2C）和电源引脚。请参阅制造商数据手册以了解复用引脚功能和配置选项。对嵌入式系统设计和 PCB 布局至关重要。
暂无详细引脚数据： ATSAML21J17B-UUT.
请参阅 数据手册 以查看完整引脚配置。
典型应用
ATSAML21J17B-UUT 适用于 6 应用s: Wearable Fitness and Health Bands, Battery-Powered IoT Sensor Nodes, Smart Metering and Utility Endpoints, Home Automation Hubs and Edge Nodes, Remote Controls and Human-Machine Interfaces, Industrial IoT Sensor Edge Nodes.
Wearable Fitness and Health Bands
The ATSAML21J17B-UUT is engineered for wearable fitness bands where PCB area is severely constrained. Its 64-ball WLCSP measures only 3.58 x 3.28 mm, fitting comfortably beside a coin-cell battery and a small OLED. The 200 nA Sleep current and 35 uA/MHz active consumption, documented in the SAM L21 Family Data Sheet, allow multi-week battery life with continuous heart-rate monitoring. The integrated PTC supports reliable capacitive touch on the band housing, while full-speed USB enables convenient charging and firmware updates. This combination of tiny footprint, deep-sleep current, and a full Cortex-M0+ peripheral set is uniquely suited to the wearable segment.
推荐
Battery-Powered IoT Sensor Nodes
IoT sensor nodes operating from a coin cell or two AA batteries benefit from the ATSAML21J17B-UUT's SleepWalking peripherals. The SAM L21 family data sheet shows that peripherals can wake the CPU only when a meaningful event occurs, keeping idle current at 200 nA. The 128 KB Flash comfortably fits Thread/Zigbee/BLE stacks, while 16 KB SRAM buffers sensor bursts. The wide 1.6 V to 3.6 V supply range works directly from a discharging Li-ion cell without boost circuitry. Integrated 12-bit ADC and SERCOM channels provide direct interfaces to environmental sensors, lowering BOM cost.
推荐
Smart Metering and Utility Endpoints
Smart electricity, gas, and water meters demand a balance of long battery life, deterministic response, and tamper-resistant storage - all delivered by the ATSAML21J17B-UUT. The Cortex-M0+ runs metering algorithms at 2.46 CoreMark/MHz while active, but stays in deep sleep for the rest of the time. The 128 KB Flash can host metering firmware plus a wireless stack, while 16 KB SRAM retains measurement buffers. Functional Safety (FuSa) features support IEC 62053-style meter designs. The industrial -40C to +85C rating and 1.6 V to 3.6 V supply cover outdoor meter cabinets.
推荐
Home Automation Hubs and Edge Nodes
Home automation edge nodes such as occupancy sensors, smart thermostats, and BLE/Zigbee coordinators fit the ATSAML21J17B-UUT perfectly. The 128 KB Flash stores the application and wireless stack concurrently, and the Cortex-M0+ 48 MHz can run low-rate encryption and mesh routing. Full-speed USB simplifies commissioning ports, and the SERCOM interfaces can be reconfigured as UART, SPI, or I2C to talk to multiple radios. The compact WLCSP allows the entire node to mount behind a wall switch. Functional Safety features support smoke/CO detector logic where relevant.
推荐
Remote Controls and Human-Machine Interfaces
Universal remote controls and HMI panels use the ATSAML21J17B-UUT for its combination of low power and rich peripherals. The integrated PTC enables reliable capacitive touch buttons without external ICs, while the Cortex-M0+ 48 MHz runs IR/RF/BLE transmit protocols with low latency. The WLCSP package keeps the BOM small enough for a slim remote housing, and 200 nA Sleep current means a coin-cell can last multiple years with intermittent use. Full-speed USB also supports rechargeable remote designs with firmware update capability.
推荐
Industrial IoT Sensor Edge Nodes
Industrial IoT edge nodes must operate reliably from -40C to +85C and survive wide voltage transients. The ATSAML21J17B-UUT's industrial temperature grade and 1.6 V to 3.6 V supply handle these conditions. Functional Safety (FuSa) features support safety-related sensing, while the SAM L21 SleepWalking architecture keeps the average current low enough to run from harvested sources. The 64-ball WLCSP allows nodes to mount in tight control cabinets, and the integrated 12-bit ADC simplifies analog sensor interfacing. The 128 KB Flash hosts application code plus OTA update staging.
推荐
推荐产品汇总
工程参考数据： ATSAML21J17B-UUT ——对比、设计指导和合规信息。
选型指南
与替代料对比
| 参数 | 本产品 | ATSAML21J18B-UUT | ATSAML21J16B-UUT | ATSAMD21J17B-UUT | ATSAML11E16A-UUT |
|---|---|---|---|---|---|
| Package | WLCSP-64 (3.58 x 3.28 mm) | WLCSP-64 (3.58 x 3.28 mm) | WLCSP-64 (3.58 x 3.28 mm) | WLCSP-64 (similar footprint) | WLCSP (lower pin count) |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Flash Memory | 128 KB | 256 KB | 64 KB | 128 KB | 64 KB |
| SRAM | 16 KB | 32 KB | 8 KB | 16 KB | 16 KB |
| Core | ARM Cortex-M0+ | ARM Cortex-M0+ | ARM Cortex-M0+ | ARM Cortex-M0+ | ARM Cortex-M23 |
| Maximum Clock Frequency | 48 MHz | 48 MHz | 48 MHz | 48 MHz | 48 MHz |
| Sleep Current (typical) | 200 nA | 200 nA | 200 nA | ~3 uA (higher) | ~500 nA |
| Supply Voltage Range | 1.6 V to 3.6 V | 1.6 V to 3.6 V | 1.6 V to 3.6 V | 1.62 V to 3.63 V | 1.62 V to 3.63 V |
关键差异点
- Lowest Sleep current in the SAM L21 family with full 128 KB Flash and 16 KB SRAM （对比 ATSAMD21J17B-UUT)
- WLCSP64 footprint shared with the J18B upgrade variant （对比 ATSAML21J18B-UUT)
- Functional Safety (FuSa) features for safety-related designs （对比 ATSAML21J16B-UUT)
设计说明
Place a 100 nF X7R 0402 decoupling capacitor as close as possible to each VDD pin and a bulk 4.7 uF ceramic near the IC. The WLCSP64 die sits directly under the balls, so use Microvia-in-Pad (VIP) or tented vias to minimize inductance. Keep the bottom layer as a continuous ground plane beneath the part to support thermal dissipation and reduce EMI.
Estimated: at 48 MHz active across all peripherals and 3.3 V supply, the ATSAML21J17B-UUT draws under 35 uA/MHz, so power dissipation is roughly 6 mW (P = V x I). Junction temperature rise above ambient is small (<2 C) and no heatsink is required. However, in sealed enclosures with no airflow, derate ambient temperature by 5-10 C to stay within the 85 C industrial ceiling.
Configure unused pins as outputs driving a defined logic level (not inputs) to eliminate shoot-through current on floating pads. Always enable the brown-out detector (BOD) in fuses to avoid Flash corruption during brown-out. Do not exceed 50 pF on the XIN/XOUT crystal traces, and keep the crystal within 5 mm of the IC to minimize parasitic capacitance.
SERCOM I/O pads operate in I/O banks that share a common VDDIO rail; if you mix 1.8 V and 3.3 V peripherals, split the bank supplies accordingly. For USB, the DP/DM traces must be 90 ohm differential with length matching to within 150 mil. Add a common-mode choke on DP/DM near the connector to pass EN 55032 radiated emissions.
合规信息
Mouser listing indicates IND TEMP GREEN, 1.6-3.6V, 48MHz - Green indicates RoHS/REACH compliant. AEC-Q100 not applicable; for automotive-grade SAM L21, see the ATSAML21E variant.
