STM32L073V8T6 ST Mainstream Arm Cortex-M0+ Ultra-Low-Power 32-bit MCU 64KB Flash 20KB SRAM EEPROM USB LCD DAC Comparator Crypto LQFP-100

STM32L073V8T6 Product Overview

The STM32L073V8T6 is a Cortex-M0+ MCU at 32 MHz, LQFP-100. 64 KB Flash, 20 KB SRAM, 6 KB EEPROM, USB 2.0 FS device (crystal-less), LCD segment driver (up to 8×32), 12-bit ADC (16 ch), 12-bit DAC, two comparators, capacitive touch channels, hardware AES-128 encryption engine, LP timers, RTC, 2×USART, 1×UART, 2×SPI, 2×I2C. Up to 84 x 5 V-tolerant I/Os. 1.65–3.6 V, -40–85 °C. Compared to the STM32L072 series, the STM32L073V8T6 adds hardware AES encryption, providing a more comprehensive 100-pin integrated platform for low-power IoT nodes, smart meters, and portable devices requiring segment display, USB communication, and data security.

STM32L073V8T6 Core Features

Core: The STM32L073V8T6 features a Cortex-M0+ core at 32 MHz with a low-power design.

Memory: The STM32L073V8T6 provides 64 KB Flash, 20 KB SRAM, and 6 KB EEPROM.

Display & Analog: The STM32L073V8T6 integrates an LCD segment driver (up to 8×32), a 12-bit DAC, a 12-bit ADC (16 ch), two comparators, and capacitive touch sensing.

USB: The STM32L073V8T6 includes a USB 2.0 FS device (crystal-less).

Security: The STM32L073V8T6 embeds a hardware AES-128 encryption engine.

Connectivity: The STM32L073V8T6 supports 2×USART, 1×UART, 2×SPI, and 2×I2C.

Timers: The STM32L073V8T6 offers an LP timer, general-purpose timers, and an RTC.

I/Os: The STM32L073V8T6 provides 84 I/O pins (5 V-tolerant).

Package: LQFP-100

Temperature Range: -40°C to 85°C

STM32L073V8T6 Applications

Smart Metering & Instrumentation: The STM32L073V8T6 is ideal for water, gas, electricity meters, and industrial instruments requiring data encryption.

Portable Devices: The STM32L073V8T6 can be used in wearables, portable medical devices, and USB peripherals.

Smart Home: The STM32L073V8T6 enables thermostats, smart switches, and secure HMI panels.

Consumer Electronics: The STM32L073V8T6 is suitable for remote controls, e-labels, and smart cards.

Energy Harvesting Applications: The STM32L073V8T6 supports self-powered sensor nodes.

STM32L073V8T6 Key Advantages

LCD + USB + AES Crypto: The STM32L073V8T6 delivers segment display, crystal-less USB, and hardware encryption — a one-stop low-power secure HMI solution.

64 KB Flash + 20 KB SRAM + 6 KB EEPROM: The STM32L073V8T6 provides ample memory for complex programs and secure data logging.

Capacitive Touch Sensing: The STM32L073V8T6 features built-in touch channels for easy button and slider implementation.

84 I/Os in LQFP-100 + 8×32 LCD: The STM32L073V8T6 offers rich pins and segment driving for complex displays and multi-peripheral systems.

Ultra-Low Power: The STM32L073V8T6 extends battery life with its multiple low-power modes.

5 V-tolerant I/Os: The STM32L073V8T6 enhances robustness and simplifies level shifting.

Full Ecosystem Compatibility: The STM32L073V8T6 enables easy development with STM32CubeIDE/HAL/LL libraries.

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FAQ

1. What is STM32L073V8T6 and what is its key feature?
The STM32L073V8T6 is an ultra-low-power 32-bit MCU from STMicroelectronics' STM32L0 series, built around an Arm® Cortex®‑M0+ core in an LQFP‑100 package. Running at 32 MHz, the STM32L073V8T6 provides 64 KB Flash and 20 KB SRAM, along with a segment LCD driver, a USB 2.0 full‑speed device controller, a 12‑bit ADC, and a 12‑bit DAC. As the most Flash‑efficient variant in the series, the STM32L073V8T6 retains the complete peripheral set while optimizing cost, making it ideal for battery‑powered devices with tightly controlled code size that still require a segment display and USB connectivity.

2. What are the key specifications of STM32L073V8T6?

• Core: Arm® Cortex®‑M0+, up to 32 MHz

• Memory: 64 KB Flash, 20 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 84

• Package: LQFP‑100 (14 mm × 14 mm)

3. Is 64 KB of Flash sufficient for real‑world projects? Can it run an RTOS and a USB stack?
Yes, with careful code selection and optimization. The STM32L073V8T6 can comfortably hold a lightweight RTOS (such as FreeRTOS), a trimmed USB device library (CDC virtual COM port or HID keyboard/mouse), segment display drivers, and basic sensor acquisition code. If large‑capacity mass storage (MSC) or complex graphical interfaces are not required, the STM32L073V8T6 is entirely feasible. Should code size grow, pin‑compatible upgrades to the VBT6 (128 KB) or VZT6 (192 KB) are available with no hardware changes.

4. How does the V8T6 differ from the STM32L073VBT6 and VZT6, apart from Flash size?
All three share identical cores, peripherals, and pinouts—including the segment LCD, USB, ADC, DAC, and full low‑power modes. The only difference is Flash capacity: the STM32L073V8T6 has 64 KB, VBT6 has 128 KB, and VZT6 has 192 KB. Therefore, the selection depends solely on firmware size. If your code is lean and mature, the STM32L073V8T6 delivers the same functionality at the most optimized system cost.

5. How many segments can the segment LCD driver control? Does the display stay on in low‑power modes?
It supports up to 8 common lines and 44 segment lines (8 COM × 44 SEG), driving a maximum of 320 segments without any external driver IC. When the MCU enters Stop mode, the STM32L073V8T6 can continue refreshing the LCD using its own independent clock and internal boost circuitry, maintaining an always‑on display. This is essential for battery‑powered meters (e.g., smart water meters, gas meters, thermostats) where users need to read values instantly without waking the CPU.

6. How low is the power consumption exactly? What are the typical currents in different modes?

• Temperature Range: -40 °C to +85 °C

• Ultra‑low‑power modes of the STM32L073V8T6:

  • Standby mode: ~0.27 µA (no RTC)

  • Stop mode: ~0.4 µA (no RTC), ~0.8 µA with RTC

  • Run mode: ~88 µA/MHz

7. What are the practical uses of the USB 2.0 full‑speed device interface? Why must an external crystal be used?
It can be configured as a CDC virtual COM port (for PC communication), an HID human interface device (keyboard/mouse), or an MSC mass storage device (flash drive emulation) for data exchange, parameter settings, and firmware updates. USB protocol demands extremely tight clock accuracy (≤0.25% tolerance), which the internal RC oscillator cannot achieve. An external high‑precision 8 MHz or 16 MHz crystal is mandatory for reliable enumeration and communication with the STM32L073V8T6.

8. What can the built‑in 12‑bit DAC do, and how can it be integrated with low‑power applications?
The STM32L073V8T6 features two independent 12‑bit DAC channels capable of outputting 0–3.3 V DC voltages or low‑frequency waveforms. In battery‑powered devices, it can generate sensor excitation signals, drive analog panel meters, or produce control voltages for 4–20 mA transmitters. When combined with DMA, the DAC can update its output automatically without waking the CPU, further reducing power consumption—ideal for portable instruments needing analog outputs.

9. What development tools are required, and is there a suitable learning board?
ST provides free STM32CubeMX for graphical configuration and STM32CubeIDE as an integrated development environment, along with the STM32CubeL0 firmware library. Debugging and programming are handled by ST‑Link debuggers. For rapid prototyping, the NUCLEO‑L073RZ board features the same L073 chip family with fully compatible peripherals. After validation, migrating code to the STM32L073V8T6 only requires adjusting the Flash size setting in the project.

10. If I need more storage or higher performance later, what upgrade paths are available?
If larger Flash is needed, you can drop‑in upgrade to the pin‑compatible STM32L073VBT6 (128 KB) or VZT6 (192 KB) with zero hardware changes. If more processing power, FPU, or color TFT displays are desired, the STM32L4 series is an excellent direction, though most L4 devices lack a segment LCD driver and DAC. Therefore, if segment display and analog output remain core requirements, the STM32L073V8T6 continues to be the best balance of functionality and power efficiency.