Item specifics
Description
STM32L152VBT6A Product Overview
The STM32L152VBT6A is an Arm Cortex-M3 MCU at 32 MHz, LQFP-100. 128 KB Flash, 16 KB SRAM, 4 KB EEPROM, LCD segment driver (up to 8×40), 12-bit ADC (24 ch), 12-bit DAC, two comparators, capacitive touch channels, LP timers, RTC, 3×USART, 2×SPI, 2×I2C. Up to 83 x 5 V-tolerant I/Os. 1.8–3.6 V, -40–85 °C. Compared to the 64-pin STM32L152RBT6A, the STM32L152VBT6A offers more I/Os and richer analog channels, providing a highly integrated ultra-low-power platform for battery-powered smart meters, industrial instruments, and HMI devices requiring segment display, large storage, and dense peripherals.
STM32L152VBT6A Core Features
Core: The STM32L152VBT6A features an Arm Cortex-M3 core at 32 MHz with a low-power design.
Memory: The STM32L152VBT6A provides 128 KB Flash, 16 KB SRAM, and 4 KB EEPROM.
Display & Analog: The STM32L152VBT6A integrates an LCD segment driver (up to 8×40), a 12-bit DAC, a 12-bit ADC (24 ch), two comparators, and capacitive touch sensing.
Connectivity: The STM32L152VBT6A supports 3×USART, 2×SPI, and 2×I2C interfaces.
Timers: The STM32L152VBT6A includes an LP timer, general-purpose timers, and an RTC.
I/Os: The STM32L152VBT6A offers 83 I/O pins, all 5 V-tolerant.
Package: The STM32L152VBT6A comes in an LQFP-100 package.
Temperature Range: The STM32L152VBT6A operates from -40°C to 85°C.
STM32L152VBT6A Applications
Smart Metering & Instrumentation: The STM32L152VBT6A is ideal for water, gas, and electricity meters, as well as industrial instruments.
Portable Devices: The STM32L152VBT6A is designed into wearables and portable medical devices.
Smart Home: The STM32L152VBT6A enables thermostats, smart switches, and HMI panels.
Consumer Electronics: The STM32L152VBT6A is used in remote controls, e-labels, and smart cards.
Energy Harvesting Applications: The STM32L152VBT6A supports self-powered sensor nodes.
STM32L152VBT6A Key Advantages
LCD Segment Driver + Ultra-Low Power: The STM32L152VBT6A integrates a segment display with extremely low power, ideal for battery-powered display applications.
128 KB Flash + 16 KB SRAM + 4 KB EEPROM: The STM32L152VBT6A offers ample storage for complex programs and data logging.
83 I/Os + 24 ADC Channels: The STM32L152VBT6A delivers rich pins and analog acquisition channels for peripheral-intensive systems.
DAC + Comparators + Capacitive Touch: The STM32L152VBT6A provides analog output, signal detection, and touch sensing all integrated.
Cortex-M3 Core: The STM32L152VBT6A features a stronger processor than M0+ while balancing complex control and low power.
5 V-tolerant I/Os: The STM32L152VBT6A offers enhanced noise immunity and simplified external circuit design.
Full Ecosystem Compatibility: The STM32L152VBT6A enables easy development with STM32CubeIDE/HAL/LL libraries.
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FAQ
1. What is STM32L152VBT6A?
The STM32L152VBT6A is an ultra-low-power 32-bit MCU from STMicroelectronics' STM32L1 series, based on an Arm® Cortex®-M3 core in an LQFP-100 package. It runs at up to 32 MHz with 128 KB Flash and 80 KB SRAM, and integrates a segment LCD driver, 12‑bit ADC, 12‑bit DAC, capacitive touch sensing channels, and a USB device interface. With a streamlined memory configuration while retaining the full peripheral set, the STM32L152VBT6A offers a cost‑effective solution for battery‑powered devices that require segment displays, analog output, and USB connectivity with moderate firmware size.
2. What are the key specifications of STM32L152VBT6A?
Core: Arm® Cortex®-M3, up to 32 MHz, 1.25 DMIPS/MHz
Memory: 128 KB Flash, 80 KB SRAM
Operating Voltage: 1.65 V to 3.6 V
Temperature Range: -40 °C to +85 °C (industrial grade)
I/O Count: up to 83
Package: LQFP-100 (14 mm × 14 mm)
3. How many segments can the built‑in LCD driver handle? Is an external driver chip required?
The STM32L152VBT6A integrates an 8 COM × 44 SEG LCD controller, capable of driving up to 320 segments. This is sufficient for the vast majority of water meters, gas meters, thermostat panels, and industrial instruments without the need for an external driver IC. The LCD can continue refreshing even when the MCU enters low‑power Stop mode, using internal boost circuitry and an independent clock, enabling always‑on displays with minimal power draw.
4. How does STM32L152VBT6A differ from the VCT6 (256 KB) and VET6 (512 KB) variants?
All three share the same package, pinout, peripherals (LCD, DAC, ADC, USB, TSC, etc.), and 80 KB SRAM. The only difference is Flash capacity: the STM32L152VBT6A has 128 KB, VCT6 has 256 KB, and VET6 has 512 KB. If your firmware fits within 128 KB, the STM32L152VBT6A is the most cost‑compact choice. For applications with relatively fixed functionality that don't require large protocol stacks, the STM32L152VBT6A's 128 KB Flash is already sufficient.
5. What can the on‑chip 12‑bit DAC do in real‑world projects?
The STM32L152VBT6A features two 12‑bit DAC channels that can output DC voltages or low‑frequency waveforms. This is highly practical in industrial control—for example, generating 4–20 mA loop control signals, providing sensor excitation voltages, creating simple alarm tones, or driving analog panel meters. With DMA, smooth ramp or sine‑wave generation is achievable without CPU overhead.
6. How does the capacitive touch sensing (TSC) feature work? Is an extra chip needed?
No extra chip is required. The TSC controller on the STM32L152VBT6A uses GPIO pins and copper pads on the PCB as sensing electrodes, supporting up to 24 touch channels. Based on the charge‑transfer principle, it provides robust touch detection with inherent moisture tolerance. ST provides a complete TSC software library for the STM32L152VBT6A, so developers only need to design the sensor pad layout and call the API—eliminating the cost of dedicated touch ICs.
7. What is its low‑power performance? What are the typical currents in various modes?
Temperature Range: -40 °C to +85 °C
Ultra‑low‑power modes of the STM32L152VBT6A:
Standby mode: ~0.3 µA (no RTC)
Stop mode: ~0.5 µA (no RTC), ~1.3 µA with RTC
Low‑power Run mode: ~10 µA/MHz
Run mode: ~230 µA/MHz
8. Can the USB device interface emulate a serial port or flash drive? What are the clock requirements?
The USB 2.0 full‑speed device controller of the STM32L152VBT6A supports CDC (virtual COM port), HID (keyboard/mouse), and MSC (mass storage) classes. USB communication demands high clock accuracy; an external 8 MHz or 16 MHz crystal with ≤0.25% tolerance is typically required for the STM32L152VBT6A. The internal RC oscillator alone may not meet USB specifications reliably, so using an external crystal is recommended for stable operation.
9. What specific applications is this chip suitable for?
With its segment LCD driver, DAC, ADC, capacitive touch, and USB, the STM32L152VBT6A excels in battery‑powered devices that need local segment display and analog control—such as handheld medical instruments, smart water/gas meters, thermostat panels, industrial handheld terminals, and portable data loggers. The 128 KB Flash and 80 KB SRAM provide well‑matched storage for these scenarios.
10. How can I migrate from the STM32L1 series to the more advanced STM32L4 series?
If future projects require higher processing performance (Cortex‑M4 core, 80 MHz, FPU), migrating to the STM32L4 series is a viable option. However, note that most L4 devices do not include a segment LCD driver or DAC. If your current design heavily depends on a segment display and analog output, the STM32L152VBT6A remains a cost‑effective choice. For designs moving to color TFT screens and more complex algorithms, the L4 series is the ideal path. Both families are supported by STM32Cube tools, with high HAL code reusability during migration.