Item specifics
Description
STM32L152RCT6 Product Overview
STM32L152RCT6 is an Arm Cortex-M3 MCU at 32 MHz, LQFP-64. The STM32L152RCT6 features 256 KB Flash, 32 KB SRAM, 8 KB EEPROM, LCD segment driver (up to 8×40), 12-bit ADC (21 ch), two 12-bit DACs, two comparators, capacitive touch channels, LP timers, RTC, 3×USART, 2×SPI, 2×I2C. The STM32L152RCT6 offers up to 51 x 5 V-tolerant I/Os and operates from 1.8–3.6 V, -40–85 °C. Compared to the STM32L152RBT6A (128 KB Flash, 16 KB SRAM, 4 KB EEPROM), the STM32L152RCT6 significantly upgrades storage capacity, providing a more powerful ultra-low-power platform for battery-powered smart meters, portable instruments, and HMI devices needing larger program space, complex data processing, and segment display.
STM32L152RCT6 Core Features
Core: The STM32L152RCT6 features an Arm Cortex-M3 core at 32 MHz, with low-power design
Memory: The STM32L152RCT6 provides 256 KB Flash, 32 KB SRAM, and 8 KB EEPROM
Display & Analog: The STM32L152RCT6 includes an LCD segment driver (up to 8×40), 2×12-bit DACs, a 12-bit ADC (21 ch), 2×Comparators, and capacitive touch
Connectivity: The STM32L152RCT6 supports 3×USART, 2×SPI, and 2×I2C
Timers: The STM32L152RCT6 features LP Timer, GP Timers, and RTC
I/Os: The STM32L152RCT6 provides 51 (5 V-tolerant)
Package: The STM32L152RCT6 comes in LQFP-64
Temperature Range: The STM32L152RCT6 operates from -40°C to 85°C
STM32L152RCT6 Applications
Smart Metering & Instrumentation: The STM32L152RCT6 excels in water, gas, electricity meters, and industrial instruments
Portable Devices: The STM32L152RCT6 is ideal for wearables and portable medical devices
Smart Home: The STM32L152RCT6 is used in thermostats, smart switches, and HMI panels
Consumer Electronics: The STM32L152RCT6 supports remote controls, e-labels, and smart cards
Energy Harvesting Applications: The STM32L152RCT6 is suitable for self-powered sensor nodes
STM32L152RCT6 Key Advantages
256 KB Flash + 32 KB SRAM + 8 KB EEPROM: The STM32L152RCT6's comprehensively upgraded storage handles complex protocol stacks and massive data logging
LCD Segment Driver + Ultra-Low Power: The STM32L152RCT6 integrates segment display with extremely low power, ideal for battery-powered display applications
Dual DACs + Comparators + Capacitive Touch: The STM32L152RCT6 offers flexible analog output, signal detection, and touch sensing all integrated
51 x 5 V-tolerant I/Os in LQFP-64: The STM32L152RCT6 provides rich pins with enhanced noise immunity for multi-peripheral connectivity
Cortex-M3 Core: The STM32L152RCT6's Cortex-M3 core provides stronger processing than M0+ while balancing complex control and low power
Full Ecosystem Compatibility: The STM32L152RCT6 ensures easy development with STM32CubeIDE/HAL/LL libraries
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FAQ
1. What is STM32L152RCT6?
The STM32L152RCT6 is an ultra-low-power 32-bit MCU from STMicroelectronics' STM32L1 series, based on an Arm® Cortex®-M3 core in an LQFP-64 package. Running at up to 32 MHz, the STM32L152RCT6 provides 256 KB Flash and 80 KB SRAM, and integrates a segment LCD driver, 12‑bit ADC, 12‑bit DAC, capacitive touch sensing (TSC), and a USB device interface. The STM32L152RCT6 delivers complete segment display, analog output, and industrial communication capabilities in a compact 64‑pin footprint, making it ideal for handheld instruments and battery‑powered human‑machine interfaces.
2. What are the key specifications of STM32L152RCT6?
Core: The STM32L152RCT6 features an Arm® Cortex®-M3 core, up to 32 MHz, 1.25 DMIPS/MHz
Memory: The STM32L152RCT6 provides 256 KB Flash and 80 KB SRAM
Operating Voltage: The STM32L152RCT6 operates from 1.65 V to 3.6 V
Temperature Range: The STM32L152RCT6 covers -40 °C to +85 °C (industrial grade)
I/O Count: The STM32L152RCT6 provides up to 51
Package: The STM32L152RCT6 comes in LQFP-64 (10 mm × 10 mm)
3. How many segments can the LCD driver handle in the 64‑pin package of the STM32L152RCT6? Is it significantly less than the 100‑pin version?
Due to pin count constraints, the LCD controller in the STM32L152RCT6's LQFP‑64 package can be configured for up to 8 common lines and 28 segment lines (8 COM × 28 SEG), driving a maximum of 224 segments. While this is a reduction from the 320 segments (44 segment lines) available on the 100‑pin variant, 224 segments are still ample for typical meter panels with numeric readouts, unit indicators, and simple icons—no external driver ICs required for the STM32L152RCT6. The LCD can continue refreshing even in low‑power modes using the internal boost converter and independent clock, achieving zero‑power visual retention.
4. What scale of application firmware can the STM32L152RCT6's 256 KB Flash and 80 KB SRAM support?
The STM32L152RCT6's 256 KB Flash easily accommodates a FreeRTOS kernel, a USB device stack (CDC/HID), a basic Modbus RTU protocol stack, and moderate user control logic. The STM32L152RCT6's 80 KB SRAM provides generous headroom for task stacks, sensor data buffers, and LCD frame memory. For most industrial metering applications requiring a segment display and analog output, the STM32L152RCT6's memory configuration is more than sufficient.
5. How can the integrated 12‑bit DAC of the STM32L152RCT6 be used in practical projects?
The STM32L152RCT6 provides two independent 12‑bit DAC channels capable of outputting 0–3.3 V DC voltages or low‑frequency waveforms. Typical uses of the STM32L152RCT6's DAC include generating control voltages for 4–20 mA current loops, supplying programmable excitation to external sensors, driving analog panel meters, or producing simple audio alarms. With DMA, the STM32L152RCT6 can achieve smooth ramp or sine‑wave generation without CPU intervention—ideal for battery‑powered systems needing analog signal outputs.
6. How does the STM32L152RCT6 perform in terms of low‑power consumption?
Temperature Range: The STM32L152RCT6 operates from -40 °C to +85 °C
Ultra‑low‑power modes of the STM32L152RCT6:
Standby mode: ~0.3 µA (no RTC) for the STM32L152RCT6
Stop mode: ~0.5 µA (no RTC), ~1.3 µA with RTC for the STM32L152RCT6
Low‑power Run mode: ~10 µA/MHz for the STM32L152RCT6
Run mode: ~230 µA/MHz for the STM32L152RCT6
7. How does capacitive touch sensing (TSC) work on the STM32L152RCT6, and is an external touch IC needed?
No external touch IC is required for the STM32L152RCT6. The TSC controller uses standard GPIO pins and copper pads on the PCB as sensing electrodes, supporting up to 24 channels on the STM32L152RCT6. Operating on the charge‑transfer principle, the STM32L152RCT6 delivers robust touch detection with inherent moisture tolerance. ST provides a complete TSC software library, so developers only need to design the touch‑pad layout and call the API—eliminating the cost of dedicated touch ICs.
8. What can the USB device interface of the STM32L152RCT6 do? Are there special clock requirements?
The STM32L152RCT6's on‑chip USB 2.0 full‑speed device controller can be configured as a CDC virtual COM port, an HID device, or an MSC mass storage device for data exchange with a PC or mobile device. Because USB communication demands precise clock accuracy, an external crystal with ≤0.25% tolerance (e.g., 8 MHz or 16 MHz) is typically required for the STM32L152RCT6. Relying solely on the internal RC oscillator may not meet USB specifications, so using an external crystal is recommended to ensure compatibility with the STM32L152RCT6.
9. How does the STM32L152RCT6 compare to the 100‑pin STM32L152VCT6?
Both the STM32L152RCT6 and the STM32L152VCT6 share the same core, Flash (256 KB), SRAM (80 KB), and digital/analog peripherals. The differences lie in the package and I/O count: the STM32L152RCT6 is an LQFP‑64 with 51 I/Os, while the STM32L152VCT6 is an LQFP‑100 with 83 I/Os. Correspondingly, the STM32L152RCT6's LCD segment count is reduced to 28 (224 segments vs. 320). If your application does not require more than 51 GPIOs and has moderate segment‑display needs, the STM32L152RCT6 delivers identical performance in a smaller PCB footprint with easier hand‑soldering.
10. If I plan to upgrade to the STM32L4 series in the future, what adjustments are needed for existing code and hardware using the STM32L152RCT6?
The STM32L4 series upgrades to a Cortex®‑M4 core with FPU at up to 80 MHz, delivering several times the processing power compared to the STM32L152RCT6. However, most L4 devices lack a segment LCD driver and DAC. If your current product heavily relies on a segment display and analog output, the STM32L152RCT6 remains the best balance of functionality and cost. For future designs moving to color TFT screens and complex algorithms, the L4 series is an excellent choice, with high HAL code reusability from the STM32L152RCT6—but display and analog peripheral strategies will need to be re‑evaluated.