STMicroelectronics STM32L422TBY6TR

Overview

STM32L422TBY6TR from STMicroelectronics is an ultra-low-power Arm® Cortex®-M4 32-bit MCU with FPU, operating up to 80 MHz (100 DMIPS), featuring 128 KB flash, 40 KB SRAM, hardware AES encryption, and integrated analog peripherals including dual 12-bit ADCs (5 Msps) and one operational amplifier. It targets battery-powered IoT sensors and portable medical devices requiring sub-µA standby operation and secure firmware execution.

For engineers reviewing the STM32L422TBY6TR datasheet, STM32L422TBY6TR pinout, STM32L422TBY6TR application, or STM32L422TBY6TR equivalent, key selection criteria include verified 245 nA Standby-with-RTC current, LPUART wake-up capability in Stop 2 mode, 52 GPIOs (most 5 V-tolerant), and UFBGA64 (5×5 mm) package compatibility with space-constrained PCB layouts.

Technical Context

The device integrates an Adaptive Real-time Accelerator (ART Accelerator™) enabling zero-wait-state execution from flash at 80 MHz, alongside a flexible power architecture supporting seven low-power modes - including Shutdown (16 nA), Standby with RTC (245 nA), and Stop 2 (0.7 µA) - all validated across -40 °C to 125 °C ambient temperature. Its interconnect matrix decouples bus arbitration for concurrent peripheral access without CPU intervention.

Core timing relies on multiple synchronized clock sources: HSE (4–48 MHz), LSE (32.768 kHz for RTC), factory-trimmed HSI16 (±1%), and auto-calibrated MSI (±0.25% accuracy via LSE). The USB 2.0 full-speed interface operates crystal-less using the internal 48 MHz HSI48 oscillator with clock recovery system (CRS).

Key Specifications

Pinout & Package

STM32L422TBY6TR uses a 64-ball UFBGA package (5 × 5 mm, 0.5 mm ball pitch) with 52 user-accessible I/Os, most rated 5 V-tolerant. Power supply pins include VDD/VSS (core), VDDA/VSSA (analog), VBAT (RTC backup), and VREF+ (ADC reference). Dedicated debug pins support SWD only (no JTAG).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar ultra-low-power MCU applications.

Compared with STM32L432KCU6, the STM32L422TBY6TR provides superior analog integration (dual ADCs + OPAMP) at lower cost and smaller UFBGA64 footprint; versus STM32L433RCT6, it trades LCD capability and memory for tighter power envelope and compact packaging - ideal for minimal-footprint, battery-critical applications.

Availability

STM32L422TBY6TR is available at Aetrix Electronics and suitable for wearable health monitors, smart utility meters, industrial wireless sensor nodes, and portable diagnostic devices requiring stable component supply across extended product lifecycles.

Supply support for STM32L422TBY6TR 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, sensors, and automotive-grade components.

The STM32L4 series targets ultra-low-power embedded applications demanding high performance-per-milliwatt, robust security, and rich analog integration - especially in battery-operated IoT endpoints and portable medical equipment.

FAQ

What is the minimum supply voltage for STM32L422TBY6TR in Run mode?

The device operates in Run mode from 1.71 V to 3.6 V. Below 1.71 V, brown-out reset (BOR) activates to prevent unreliable operation. The internal regulator supports two voltage scaling ranges: Range 1 (1.2 V core) for highest efficiency and Range 2 (1.8 V core) for maximum frequency stability at 80 MHz.

Does STM32L422TBY6TR support hardware debugging via JTAG?

No - STM32L422TBY6TR supports Serial Wire Debug (SWD) only, not full JTAG. The SWD interface uses SWCLK and SWDIO pins (PA14/PA13), providing full debug functionality including breakpoints, watchpoints, and memory inspection, while reducing pin count and PCB routing complexity compared to JTAG.

Can the internal OPAMP drive a 10 kΩ load with rail-to-rail output?

Yes - the integrated OPAMP supports rail-to-rail output swing and delivers ±20 mA output current, sufficient to drive 10 kΩ loads directly. Its programmable gain (1x, 2x, 4x, 8x, 16x) and internal connection to ADC inputs enable precision sensor signal conditioning without external components.

Is the 32.768 kHz LSE oscillator mandatory for RTC operation?

No - the RTC can operate using either the external 32.768 kHz LSE crystal or the internal low-power 32 kHz RC oscillator (±5%). However, LSE is required for RTC calibration and sub-second accuracy; the internal RC is suitable only for coarse timekeeping where ±5% drift is acceptable.