STM8L151R8T6 ST Ultra-low-power 8-bit MCU 64KB Flash ADC DAC Comparator Touch LQFP-64

STM8L151R8T6 Product Overview

The STM8L151R8T6 is an ultra-low-power 8-bit MCU with enhanced STM8 core up to 16 MHz (16 MIPS). It offers 64 KB Flash, 4 KB RAM, 2 KB EEPROM, 400 nA Halt, 4.7 µs wake-up, 28-ch 12-bit ADC, dual 12-bit DAC, dual comparators, capacitive touch, advanced control timer, and 2×SPI/I2C/3×USART interfaces. Packaged in LQFP-64 (10×10 mm) with 54 I/Os. Ideal for smart metering, industrial control, portable medical, and battery-powered devices.[reference:25][reference:26]

STM8L151R8T6 Core Features

Ultra-low Power: 5 modes, 400 nA Halt, 5.9 µA Low-power run, 3 µA Low-power wait, 1.4 µA Active-halt with RTC, 50 nA I/O leakage, 4.7 µs wake-up Enhanced Core: STM8 16 MHz, 16 MIPS, Harvard architecture, 3-stage pipeline, 40 external interrupts Memory: 64 KB Flash, 4 KB RAM, 2 KB EEPROM (ECC, 100k cycles, RWW) 28-ch 12-bit ADC: 1 Msps, temperature sensor, internal Vref Dual 12-bit DAC: Buffered output Dual Comparators: Fixed + rail-to-rail, both wake-up capable Capacitive Touch: Integrated touch key sensing Communication: 2×SPI, I2C (400 kHz SMBus/PMBus), 3×USART (IrDA) Timers: 4×16-bit (IC/OC/PWM/encoder), 1×16-bit advanced (3-ch complementary/dead-time), 1×8-bit basic, beeper, dual watchdogs RTC: BCD calendar, alarm, ±0.5 ppm calibration, anti-tamper, Halt wake-up DMA: 4 channels (ADC, DAC, SPI, I2C, USART, timers) Reliability: POR/PDR, 5-level BOR, PVD, clock security, ESD Wide Range: 1.65–3.6 V (no BOR), 1.8–3.6 V (with BOR), -40 °C to 85 °C (105 °C/125 °C optional) Development: SWIM single-wire debug, USART bootloader, 96-bit unique ID

STM8L151R8T6 Applications

Smart Metering: Water/gas/heat/electricity meters, ultra-low power, 64 KB for complex protocols Industrial Automation: Machinery, process control, sensor acquisition, wide temp Smart Home: Lighting, heating, security systems, energy-efficient Automotive: Vehicle sensor modules, data acquisition nodes Medical: Glucose meters, blood pressure monitors Battery Devices: Remote controls, sensors, multi-year coin-cell life Touch HMI: Touch keys, sliders without external ICs Consumer: Instrumentation, industrial controllers, digital electronics

STM8L151R8T6 Key Advantages

Ultra-low Power: 400 nA Halt, 5 modes, years of coin-cell operation Analog Integration: 28-ch ADC + dual 12-bit DAC + dual comparators, no external analog ICs Dual DAC Output: Dual buffered 12-bit DAC, rare in this class Touch Built-in: Integrated capacitive sensing, eliminates touch IC DMA Offload: 4-ch DMA manages multiple peripherals, boosting efficiency Motor Control: Advanced timer with complementary PWM & dead-time 64 KB Large Memory: 64 KB Flash + 4 KB RAM for complex protocols and algorithms High Integration: LQFP-64 package, 54 I/Os, saves PCB area and BOM Mature Ecosystem: STM8 architecture, low-cost SWIM debug Fast Wake-up: 4.7 µs wake-up, shorter response time Industrial Reliability: -40 to 85 °C (125 °C opt.), BOR/ESD protection

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FAQ:

1. What is the STM8L151R8T6 and its key specifications?
   The STM8L151R8T6 is an ultra‑low‑power 8‑bit microcontroller from STMicroelectronics based on the STM8L core at up to 16 MHz. It provides 64 KB of Flash program memory, 4 KB of SRAM, and 2 KB of true data EEPROM. Key peripherals include a 12‑bit ADC (up to 25 external channels), a 12‑bit DAC, DMA, RTC with calendar, AES‑128 hardware encryption, and communication interfaces: USART, SPI, I2C. Housed in an LQFP‑64 package, it provides up to 54 I/O pins and operates over ‑40 °C to +85 °C. No LCD controller is integrated, making it ideal for ultra‑low‑power sensors, metering, and secure IoT nodes that do not require a segment display.

2. How does the STM8L151R8T6 differ from the STM8L152R8T6?
   The only significant difference is the LCD controller. The STM8L151R8T6 does not have an LCD driver, while the STM8L152R8T6 integrates a hardware LCD controller capable of driving up to 4 commons × 28 segments. Both MCUs share exactly the same Flash (64 KB), SRAM (4 KB), EEPROM (2 KB), analog peripherals (12‑bit ADC/DAC), DMA, RTC, and AES. Choose the L151 when a display is not needed; it is often more cost‑effective while delivering the same processing and analog performance.

3. What is the difference between STM8L151R8T6 and STM8L151C8T6?
   Both have identical core, memory, and peripherals. The only difference is the package and I/O count. The R8T6 uses an LQFP‑64 package and provides 54 general‑purpose I/O pins, while the C8T6 comes in a smaller LQFP‑48 with 41 I/O pins. Choose the R8T6 when your design requires more sensor connections or communication channels; the C8T6 offers a more compact footprint for space‑constrained boards.

4. What ultra‑low‑power modes does the STM8L151R8T6 offer?
   This MCU is built for battery‑powered applications. In Run mode at 1 MHz, the current is about 195 µA. It drops to 5.1 µA in Low‑power run mode. Active‑halt mode with the RTC running draws only 1.0 µA, and full Halt mode consumes 0.35 µA (typical). The fast wake‑up from these modes makes the chip perfect for coin‑cell‑powered sensors and meters that must operate for years without battery replacement.

5. Can the STM8L151R8T6 drive a brushless DC motor?
   No. The STM8L151R8T6 does not include an advanced‑control timer (such as TIM1) with complementary PWM outputs and dead‑time insertion. It provides general‑purpose timers (TIM2, TIM3, TIM4) that can generate standard PWM signals for DC motor speed control, servo driving, or LED dimming. For three‑phase BLDC motor control, an external gate driver with built‑in dead‑time is required, or you can switch to an STM8S/STM32 series MCU with a full motor‑control timer.

6. What are the ADC and DAC specifications of the STM8L151R8T6?
   The MCU features a 12‑bit successive‑approximation ADC with up to 25 external analog input channels (in the LQFP‑64 package) and an internal temperature sensor. The separate 12‑bit DAC provides a buffered analog voltage output for generating control voltages, audio waveforms, or reference signals. The ADC can be triggered by a timer, and together with the DMA unit, it supports high‑speed data acquisition with very low CPU overhead.

7. How much memory does the STM8L151R8T6 have?
   It provides 64 KB of Flash program memory, 4 KB of SRAM, and 2 KB of true data EEPROM. The EEPROM offers high‑endurance storage for calibration constants or user settings without wearing out the Flash. With 64 KB of code space, you can comfortably fit communication stacks, AES encryption routines, and complex application logic, leaving room for future firmware updates.

8. What package does the STM8L151R8T6 use and how many I/O pins are there?
   It comes in an LQFP‑64 package (10 mm × 10 mm, 0.5 mm lead pitch) and provides up to 54 general‑purpose I/O pins. This large I/O count makes the chip well‑suited for sensor‑intensive applications, multi‑channel data loggers, and systems that need multiple communication ports.

9. What is the supply voltage range of the STM8L151R8T6? Can it be powered by a coin cell?
   The operating voltage is 1.8 V to 3.6 V, which is ideal for single‑cell CR2032 coin‑cell batteries or two alkaline AAA cells. The MCU includes a low‑voltage reset (BOR) with programmable thresholds to ensure safe operation as the battery discharges. Note that 5 V is not supported; if 5 V components are present, a voltage regulator is required.

10. How to program and debug the STM8L151R8T6? What are its typical applications?
    Programming and debugging use the single‑wire SWIM interface, with a low‑cost ST‑LINK/V2 as the standard tool. Firmware can be developed with STVD + Cosmic C or the open‑source SDCC compiler, and ST provides the STM8L15x standard peripheral library. Typical applications include battery‑operated utility meters (gas/water/heat), portable medical devices, industrial wireless sensors, and secure IoT endpoints that require years of battery life, a rich analog front‑end, and AES encryption.