STMicroelectronics STM32L152R8T6A

Overview

STM32L152R8T6A from STMicroelectronics is an ultra-low-power 32-bit ARM® Cortex®-M3 microcontroller featuring 128 KB Flash, 32 KB SRAM, 4 KB EEPROM with ECC, 12-bit ADC (1 Msps, 24 channels), and dual 12-bit DACs - deployed in battery-powered IoT sensors, portable medical monitors, and smart utility meters requiring sub-µA standby operation.

For engineers reviewing the STM32L152R8T6A datasheet, STM32L152R8T6A pinout, STM32L152R8T6A application, or STM32L152R8T6A equivalent, key selection criteria include verified ultra-low-power mode current (0.28 µA Standby), USB 2.0 full-speed interface with internal 48 MHz PLL, LCD driver support (up to 8×40 segments), and 73 5V-tolerant I/Os with capacitive touch sensing capability.

Technical Context

The STM32L152R8T6A integrates an ARM Cortex-M3 core operating up to 32 MHz with MPU, dynamic voltage scaling, and five low-power modes (Run, Sleep, Low-power Run, Stop, Standby) - each with defined wakeup sources and current profiles. Its clock system combines HSE (1–24 MHz), LSE (32.768 kHz), HSI (16 MHz ±1%), LSI (37 kHz), and MSI (65 kHz–4.2 MHz), plus a dedicated USB PLL.

Analog subsystem includes two ultra-low-power comparators with window mode and wake-up capability, temperature sensor, VREFINT reference, and hardware-accelerated CRC unit. Memory architecture supports ECC on Flash and EEPROM, and 80-byte backup registers retained in Standby mode.

Key Specifications

Pinout & Package

LQFP64 package (10 × 10 mm, 0.5 mm pitch), 64-pin quad flat leaded package with exposed thermal pad - compatible with standard reflow processes and cost-effective PCB assembly.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STM32L152R8T6A, the STM32L432KCU6 offers higher compute density and deeper sleep but sacrifices EEPROM and LCD; the EFM32PG12B500F1024GL125 provides larger memory and lower deep-sleep current but requires external USB hardware - making STM32L152R8T6A optimal for balanced ultra-low-power designs needing integrated peripherals and proven ecosystem support.

Availability

STM32L152R8T6A is available at Aetrix Electronics and suitable for battery-powered IoT sensors, portable medical monitors, and smart utility meters requiring stable component supply and long-term industrial lifecycle support.

Supply support for STM32L152R8T6A 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, delivering silicon solutions for automotive, industrial, and consumer markets since 1987.

The STM32L1 series targets ultra-low-power embedded applications demanding extended battery life, robust analog integration, and certified functional safety - designed specifically for wearables, smart meters, and portable diagnostics.

FAQ

Does STM32L152R8T6A support USB device mode without external crystal?

Yes. The device integrates a 48 MHz PLL that can lock to the internal MSI oscillator or external HSE, eliminating the need for a dedicated 48 MHz crystal. USB full-speed operation is fully supported in device mode using only the standard 1–24 MHz HSE or calibrated MSI source, reducing BOM cost and board space.

What is the maximum operating temperature and voltage range for reliable EEPROM writes?

The STM32L152R8T6A guarantees EEPROM endurance of 100,000 write/erase cycles and data retention of 15 years at Tj ≤ 85°C. Writes require VDD ≥ 2.4 V; operation below this voltage disables EEPROM programming to prevent corruption. Full functionality is specified from –40°C to +105°C ambient.

How many I/O pins support capacitive touch sensing, and what is the minimum detectable delta-C?

All 20 dedicated CTSU channels map to GPIOs PA0–PA7, PB0–PB15, and PC0–PC7. With default settings, the controller resolves capacitance changes as low as 0.1 pF at 100 Hz scan rate. Sensitivity is adjustable via programmable charge current and sampling time, enabling robust touch detection through 3 mm glass overlays.

Is the LCD controller capable of driving segment-based displays without external bias circuitry?

Yes. The integrated LCD controller supports static, 2/3/4-mux configurations up to 8×40 segments and includes an on-chip step-up converter generating VLCD from VDD. Contrast is software-adjustable via 32-level internal resistor ladder, removing need for external voltage dividers or DC-DC bias ICs.