MM32L073PF
Cortex-M0+ MCU with 64KB Flash, 8KB RAM, ultra-low power consumption for battery-powered applications
Product Overview
Description
The MM32L073PF is an ultra-low-power microcontroller featuring ARM Cortex-M0+ core optimized for battery-powered applications. It delivers excellent energy efficiency with multiple low-power modes and fast wake-up times.
This MCU includes 64KB Flash memory and 8KB SRAM, providing sufficient resources for sensor applications and IoT endpoints. Rich peripherals include 12-bit ADC, multiple communication interfaces, and LCD driver support.
The device achieves sub-microamp standby current with RTC running, enabling years of operation from small coin cell batteries. It operates from 1.8V to 3.6V and supports industrial temperature range.
Product Series
MM
Primary Application
Battery-powered sensors
Key Features
- ARM Cortex-M0+ up to 48MHz
- 64KB Flash with read protection
- 8KB SRAM
- Ultra-low power consumption
- Multiple low-power modes
- 12-bit ADC with 16 channels
- LCD driver support
- Rich communication interfaces
Specifications
| Core | ARM Cortex-M0+ |
|---|---|
| Frequency | 48 MHz |
| Flash | 64 KB |
| RAM | 8 KB |
| Active Current | 100μA/MHz |
| Standby Current | 0.5μA with RTC |
| Package | LQFP-48 |
Applications
Battery-powered sensors
Battery and charging management
Wireless IoT devices
Electronic system design
Smart meters
Electronic system design
Portable medical devices
Medical electronics
Environmental monitors
Electronic system design
FAE Expert Insights
"The MM32L073PF is my go-to recommendation for battery-powered IoT sensor applications. The sub-microamp standby current with RTC running is genuinely impressive - I've measured consistent 0.5μA consumption in standby mode. The fast wake-up time from deep-sleep (less than 10μs) means the MCU can quickly process sensor data and return to sleep, maximizing battery life. I particularly like the integrated LCD driver which eliminates the need for external components in display applications. The peripheral clock gating allows fine-grained power control. For a smart meter application I supported, we achieved over 5 years of operation from a single CR2032 coin cell. The Cortex-M0+ core provides sufficient processing power for sensor fusion and wireless protocol stacks while maintaining energy efficiency."
Excellent ultra-low-power MCU achieving sub-μA standby current for battery applications
— Sarah Liu, BeiLuo
Frequently Asked Questions
What is the minimum supply voltage for MM32L073PF?
The MM32L073PF operates from 1.8V to 3.6V supply voltage, with full functionality maintained across this range. At 1.8V, the maximum CPU frequency is limited to 24MHz, while at 2.7V and above, the full 48MHz operation is supported. The wide voltage range allows direct operation from various battery configurations: single Li-ion cell (3.7V), two AA/AAA alkaline cells (3.0V), or regulated 1.8V supply. The MCU includes brown-out reset (BOR) with programmable threshold to ensure reliable operation during battery discharge. The low minimum voltage enables operation even when batteries are nearly depleted, extending usable battery life. For applications using coin cell batteries, the MCU can operate until the battery is almost completely discharged.
Contact LiTong for power supply design guidance for battery applications.
How accurate is the internal RC oscillator?
The MM32L073PF includes multiple internal RC oscillators: (1) HSI (High-Speed Internal) - 8MHz RC oscillator with ±1% accuracy at 25°C after calibration, ±2% over -10°C to 85°C, and ±3% over full temperature range. Suitable for most applications without external crystal. (2) MSI (Multi-Speed Internal) - Programmable frequency from 65kHz to 4MHz with similar accuracy to HSI. Useful for low-power applications requiring variable clock speeds. (3) LSI (Low-Speed Internal) - 40kHz RC oscillator for RTC and watchdog with ±5% typical accuracy. For applications requiring higher clock accuracy (such as USB or precise timing), an external crystal oscillator (HSE) can be used. The HSI can be automatically calibrated against HSE when available. For most battery-powered sensor applications, the internal RC oscillators provide sufficient accuracy without the cost and PCB space of external crystals.
Contact LiTong for clock accuracy analysis and external crystal selection if needed.
What is the ADC accuracy and sampling rate?
The MM32L073PF features a 12-bit SAR ADC with the following specifications: (1) Resolution - 12-bit with 4096 quantization levels. (2) Sampling rate - Up to 1Msps (million samples per second) at maximum resolution. (3) INL (Integral Non-Linearity) - ±2 LSB typical, ±4 LSB maximum. (4) DNL (Differential Non-Linearity) - ±1 LSB typical, ±2 LSB maximum. (5) ENOB (Effective Number of Bits) - Typically 10.5 bits at 1Msps. (6) Input impedance - Depends on sampling time setting; longer sampling times allow higher source impedance. (7) Temperature sensor - Built-in with ±2°C accuracy typical. The ADC supports single, continuous, scan, and discontinuous conversion modes with DMA support. For high-impedance sources, an external op-amp buffer may be needed. The ADC can operate in low-power modes enabling periodic sampling with minimal energy consumption.
Contact LiTong for ADC accuracy optimization and signal conditioning guidance.
Does MM32L073PF support capacitive touch sensing?
Yes, the MM32L073PF supports capacitive touch sensing through the TSC (Touch Sensing Controller) peripheral. The TSC features: (1) Support for up to 24 capacitive sensing channels for buttons, sliders, and wheels. (2) Charge transfer acquisition principle providing robust touch detection. (3) Programmable charge transfer frequency and pulse width for sensitivity tuning. (4) Hardware noise filtering reducing false triggers. (5) Acquisition interrupt for efficient CPU usage. (6) Spread spectrum feature for improved EMC performance. The touch sensing functionality operates in low-power modes enabling wake-on-touch capability. This eliminates the need for external touch controller ICs, reducing BOM cost and PCB space. The MindMotion SDK includes touch sensing library with calibration and detection algorithms. Typical applications include appliance control panels, wearable device interfaces, and industrial HMI applications.
Contact LiTong for capacitive touch application development and tuning guidance.
What debug and programming interfaces are supported?
The MM32L073PF supports industry-standard debug and programming interfaces: (1) SWD (Serial Wire Debug) - Two-wire debug interface (SWDIO and SWCLK) compatible with ARM CoreSight. Supports code download, single-step debugging, breakpoints, and real-time variable inspection. (2) JTAG - Four-wire JTAG interface also supported for debugging. (3) ISP (In-System Programming) - Programming via UART or I2C for production programming without debugger. (4) IAP (In-Application Programming) - Flash memory can be updated by application firmware enabling field updates. The SWD interface is the recommended debug method requiring minimal pins. Debug tools supported include MindMotion Programmer, Keil ULINK, J-Link, and ST-Link. The MCU includes Flash protection preventing unauthorized readout of programmed code. LiTong provides debug tools, programming services, and technical support for development and production.
Contact LiTong for debug tool recommendations and programming setup guidance.