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STMicroelectronics STM32L422RBT6
- Part No.:
- STM32L422RBT6
- Manufacturer:
- STMicroelectronics
- Category:
- Microcontrollers
- Package:
- 64-LQFP
- Datasheet:
-
STM32L422RBT6.pdf
- Description:
- IC MCU 32BIT 128KB FLASH 64LQFP
- Quantity:
- Payment:
- Shipping:
Inventory:141
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Product details
Overview
STM32L422RBT6 from STMicroelectronics is an ultra-low-power Arm® Cortex®-M4 32-bit MCU with FPU, 128KB flash, 40KB SRAM, and integrated analog peripherals including dual 12-bit ADCs (5 Msps), one operational amplifier with PGA, and one ultra-low-power comparator - deployed in battery-powered IoT sensor nodes requiring sub-µA standby operation and secure firmware execution.
For engineers reviewing the STM32L422RBT6 datasheet, STM32L422RBT6 pinout, STM32L422RBT6 application, or STM32L422RBT6 equivalent, key selection criteria include verified 245 nA Standby-with-RTC current, AES-128/256 hardware acceleration, LPUART wake-up capability in Stop 2 mode, and QSPI XIP support for external code execution.
Technical Context
The device implements FlexPowerControl architecture with seven low-power modes, including Shutdown (16 nA), Standby (32 nA), and Stop 2 (245 nA with RTC), enabled by independent voltage regulators and dynamic voltage scaling. Its ART Accelerator™ delivers zero-wait-state execution from flash at up to 80 MHz.
Clock system integrates multiple oscillators: 4–48 MHz HSE, 32 kHz LSE for RTC, factory-trimmed 16 MHz HSI16 (±1%), and auto-calibrated MSI (100 kHz–48 MHz, ±0.25%). USB 2.0 full-speed operates without external crystal via internal 48 MHz HSI48 with clock recovery.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Core | Arm Cortex-M4 with FPU, 80 MHz max frequency, 100 DMIPS, DSP instructions |
| Memory | 128 KB single-bank Flash (with readout protection), 40 KB SRAM (8 KB with parity) |
| Low-power Current | 245 nA Standby with RTC; 79 µA/MHz Run mode (LDO); 4 µs wakeup from Stop |
| Analog Peripherals | 2× 12-bit ADC (5 Msps, 16-bit oversampling), 1× OPAMP+PGA, 1× ultra-low-power comparator |
| Security & Crypto | AES-128/256 hardware accelerator, TRNG, CRC unit, 96-bit unique ID |
| Communication | USB 2.0 FS (crystal-less), 3× I²C FM+, 3× USART, 1× LPUART, 2× SPI, 1× Quad-SPI (XIP capable) |
| Timers | 10 timers: 1× advanced-control (TIM1), 2× general-purpose (TIM2/TIM15), 1× basic (TIM6), 2× low-power (LPTIM1/2), 2× watchdogs |
Pinout & Package
STM32L422RBT6 is housed in a 64-pin LQFP package (10 × 10 mm, 0.5 mm pitch), RoHS-compliant and ECOPACK2 certified. Pin functions are validated per ST's DS12470 Rev 6, Section 4 "Pinouts and pin description".
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD, VSS | Power supply and ground | Core and I/O domain supply (1.71–3.6 V); separate VDDA/VSSA for analog |
| PA0–PA15, PB0–PB15, PC0–PC15, PD0–PD2, PF0–PF1 | General-purpose I/O | Up to 52 fast I/Os; most 5 V-tolerant; support 12 alternate functions including UART, SPI, I²C, TIM |
| NRST | Reset input | Active-low reset with internal pull-up; supports external reset and programmable reset source selection |
| BOOT0 | Boot mode selection | High at power-up selects system memory boot; used with NRST for bootloader entry |
| OSC_IN / OSC_OUT | HSE crystal interface | Supports 4–48 MHz external crystal; optional load capacitors required per layout |
| LSE_IN / LSE_OUT | RTC crystal interface | 32.768 kHz crystal connection for calendar RTC; enables VBAT backup operation |
| VBAT | Battery backup supply | Supplies RTC and 32×32-bit backup registers during main power loss (300 nA consumption) |
Key Features
| Feature | Design Value |
|---|---|
| FlexPowerControl architecture | Enables 7 distinct low-power modes with precise wakeup latency control (e.g., 4 µs from Stop) |
| ART Accelerator™ | Eliminates flash wait states at 80 MHz, enabling deterministic real-time response in battery-constrained apps |
| Quad-SPI with XIP | Allows direct code execution from external flash, reducing on-chip memory footprint and BOM cost |
| Capacitive touch sensing (TSC) | 12-channel controller supporting touchkey, linear, and rotary sensors without external components |
| Hardware AES engine | Accelerates encryption/decryption for secure OTA updates and data-at-rest protection in edge devices |
Applications
| Smart Utility Metering | Wearable Health Monitor |
|---|---|
Use Scenario: Battery-operated gas/water meter with hourly RF transmission and decade-long battery life. IC Role / Device Role / Timing Role: Main controller managing sensor acquisition (pressure/temp), RTC-based scheduling, AES-encrypted data packaging, and LPUART-triggered RF module wakeup. Use Value: 245 nA Standby-with-RTC enables >12-year battery life using CR2477; LPUART wake-up eliminates polling overhead. | Use Scenario: ECG patch with continuous analog front-end sampling, motion artifact correction, and Bluetooth LE telemetry. IC Role / Device Role / Timing Role: Signal processor running FIR filters on ADC data, managing OPAMP gain staging, and synchronizing BLE advertising intervals via LPTIM2. Use Value: Dual 12-bit ADCs (5 Msps) capture high-fidelity biopotentials; 8 KB SRAM with parity ensures data integrity during motion-induced glitches. |
| Industrial Wireless Sensor Node | Asset Tracking Beacon |
Use Scenario: LoRaWAN node monitoring temperature/humidity/vibration in remote equipment cabinets. IC Role / Device Role / Timing Role: Multi-sensor aggregator using TSC for button interface, ADC for analog sensors, and AES for payload encryption before LoRa transmission. Use Value: Batch Acquisition Mode (BAM) reduces active time during sensor reads; 79 µA/MHz Run efficiency extends AA-cell lifetime to 5+ years. | Use Scenario: GPS-denied indoor asset tag reporting location via BLE proximity and accelerometer-triggered alerts. IC Role / Device Role / Timing Role: Motion-aware controller using internal 32 kHz RC oscillator for low-power sleep timing and LPTIM1 for precise wake intervals. Use Value: 32 nA Standby mode (4 wakeup pins) enables multi-year operation on coin cell; VBAT-backed RTC maintains accurate timestamp across power cycles. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar ultra-low-power MCU applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| STM32L432KBU6 | Same core and peripheral set but in WLCSP36 (2.6×3.1 mm); 256 KB flash, 64 KB SRAM; no Quad-SPI | Better suited for space-constrained wearables; lacks XIP-capable external memory interface | Select when PCB area is critical and external flash is unnecessary |
| STM32L552RET6 | ARMv8-M TrustZone-enabled; 512 KB flash, 256 KB SRAM; 110 µA/MHz Run; 220 nA Standby-with-RTC | Required for certified secure boot, firmware attestation, and isolated crypto key storage | Select when PSA Level 1 or SESIP certification is mandated |
Compared with STM32L432KBU6, the STM32L422RBT6 offers larger QSPI interface and smaller pin count trade-off; versus STM32L552RET6, it provides lower cost and proven field reliability without TrustZone overhead - ideal for cost-sensitive, non-certified industrial IoT endpoints.
Availability
STM32L422RBT6 is available at Aetrix Electronics and suitable for smart utility metering, wearable health monitors, industrial wireless sensor nodes, and asset tracking beacons requiring stable component supply across multi-year production cycles.
Supply support for STM32L422RBT6 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, designing and manufacturing microcontrollers, power management ICs, MEMS, and automotive semiconductors since 1987.
The STM32L4 series targets ultra-low-power embedded applications demanding extended battery life, robust security, and rich analog integration - optimized for IoT edge nodes, portable medical devices, and energy-harvesting systems.
FAQ
What is the maximum operating frequency and associated performance metric?
The STM32L422RBT6 runs at up to 80 MHz using its Arm Cortex-M4 core with FPU. It achieves 100 DMIPS (Dhrystone 2.1) and 273.55 CoreMark® (3.42 CoreMark/MHz), validated with ART Accelerator™ enabled and zero-wait-state flash execution.
Does this MCU support hardware-accelerated cryptography beyond AES?
No - the STM32L422RBT6 integrates only AES-128/256 hardware acceleration and a true random number generator (TRNG). It does not include dedicated SHA, RSA, or ECC engines; those require software libraries or higher-series MCUs like the STM32L5.
Can the internal opamp drive external loads directly, or is external buffering required?
The integrated opamp supports rail-to-rail output and programmable gain (1x–40x via internal PGA), but its output drive capability is limited to ~10 mA. For driving capacitive loads >100 pF or resistive loads <2 kΩ, external unity-gain buffer or driver stage is recommended per Section 6.3.20 of DS12470 Rev 6.
Is the LQFP64 package RoHS-compliant and lead-free?
Yes - the STM32L422RBT6 in LQFP64 (10×10 mm) meets RoHS Directive 2011/65/EU and is fully lead-free. It carries ST's ECOPACK2 environmental compliance certification, confirmed in Table 1 of DS12470 Rev 6 and ST's official product page.
STM32L422RBT6 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Package/Case:
- 64-LQFP
- Series:
- STM32L4
- Packaging:
- Tray
- Product Status:
- Active
- Programmable:
- Not Verified
- Core Processor:
- ARM® Cortex®-M4
- Core Size:
- 32-Bit Single-Core
- Speed:
- 80MHz
- Connectivity:
- I2C, Infrared, IrDA, LINbus, Quad SPI, SPI, UART/USART, USB
- Peripherals:
- Brown-out Detect/Reset, DMA, PWM, WDT
- Number of I/O:
- 52
- Program Memory Size:
- 128KB (128K x 8)
- Program Memory Type:
- FLASH
- EEPROM Size:
- -
- RAM Size:
- 40K x 8
- Voltage - Supply (Vcc/Vdd):
- 1.71V ~ 3.6V
- Data Converters:
- A/D 16x12b
- Oscillator Type:
- Internal
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
STM32L422RBT6 FAQ
1.How can I place an order for STM32L422RBT6 through Aetrix?
Please submit a Request for Quotation (RFQ) for STM32L422RBT6 on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for STM32L422RBT6 reliable?
The price and inventory of STM32L422RBT6 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STM32L422RBT6 is usually 5 days.
3.What payment methods are accepted for STM32L422RBT6?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STM32L422RBT6 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for STM32L422RBT6?
STM32L422RBT6 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your STM32L422RBT6 order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for STM32L422RBT6?
For technical support, including STM32L422RBT6 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STM32L422RBT6 requirements.
6.How does Aetrix verify that STM32L422RBT6 is sourced from the original manufacturer or authorized distributors?
All STM32L422RBT6 products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that STM32L422RBT6 meets industry standards.
7.What is the process for return or replacement of STM32L422RBT6?
All STM32L422RBT6 units undergo pre-shipment inspection (PSI). If there is an issue with STM32L422RBT6, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The STM32L422RBT6 part is unused and in its original packaging.
Return procedure for STM32L422RBT6:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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