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STMicroelectronics STM32F101CBU6TR
- Part No.:
- STM32F101CBU6TR
- Manufacturer:
- STMicroelectronics
- Category:
- Microcontrollers
- Package:
- 48-UFQFN Exposed Pad
- Datasheet:
-
STM32F101CBU6TR.pdf
- Description:
- IC MCU 32BIT 128KB FLSH 48UFQFPN
- Quantity:
- Payment:
- Shipping:
Inventory:4,049
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Product details
Overview
STM32F101CBU6TR from STMicroelectronics is a medium-density ARM® Cortex®-M3 32-bit microcontroller with 128 KB Flash, 16 KB SRAM, 36 MHz max CPU frequency, 12-bit ADC (1 µs conversion), and 7 communication interfaces including 3 USARTs, 2 I²C, and 2 SPI. It operates from 2.0–3.6 V and supports industrial temperature range (–40 to +85 °C), deployed in motor control subsystems, sensor interface modules, and programmable logic controllers.
For engineers reviewing the STM32F101CBU6TR datasheet, STM32F101CBU6TR pinout, STM32F101CBU6TR application, or STM32F101CBU6TR equivalent, key selection considerations include Flash/SRAM size, 48-pin UFQFPN package compatibility, 36 MHz real-time execution capability, and integrated peripherals such as independent/watchdog timers, RTC with VBAT support, and 5 V-tolerant GPIOs.
Technical Context
The STM32F101CBU6TR implements an ARM Cortex-M3 core with Harvard architecture, single-cycle multiplication, hardware divide, and nested vectored interrupt controller (NVIC) supporting up to 68 interrupts. Its clock system integrates 4–16 MHz external crystal oscillator, 8 MHz internal RC, 40 kHz LSI, and PLL for scalable CPU clock generation.
DMA operation uses a 7-channel controller servicing timers, ADC, SPI, I²C, and USART peripherals without CPU intervention. The analog subsystem includes a 12-bit, 1 µs ADC with up to 16 channels, internal temperature sensor, and reference voltage input (VREF+), all operating within 2.0–3.6 V supply range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| CPU Core | ARM Cortex-M3, 36 MHz max - enables deterministic real-time response for control loops with ≤27.8 ns instruction cycle time. |
| Flash Memory | 128 KB - sufficient for bootloader + application firmware with space for field updates in embedded control systems. |
| SRAM | 16 KB - supports stack/heap allocation for multitasking RTOS environments and buffered peripheral data transfers. |
| ADC Resolution & Speed | 12-bit, 1 µs conversion - achieves 1 MSPS sampling rate for precision analog sensing (e.g., current/voltage monitoring). |
| I/O Count & Tolerance | 37 I/O pins, 5 V-tolerant - allows direct interfacing with legacy 5 V logic without level shifters in mixed-voltage designs. |
| Communication Interfaces | 3× USART, 2× I²C, 2× SPI - supports simultaneous serial sensor networks, display interfaces, and host MCU communication. |
| Timers | 6 timers: 3× 16-bit general-purpose, 2× watchdog (independent/window), 1× SysTick - enables PWM motor drive, safety-critical timeout supervision, and OS tick timing. |
| Package | UFQFPN48, 7 × 7 mm, 0.5 mm pitch - compact footprint suitable for space-constrained industrial PCBs with reflow-compatible land pattern. |
Pinout & Package
STM32F101CBU6TR is housed in a 48-pin Ultra Thin Fine Pitch Quad Flat No-lead (UFQFPN) package measuring 7 × 7 mm with 0.5 mm pitch. This RoHS-compliant, ECOPACK®-certified package supports high-density routing and thermal dissipation via exposed thermal pad.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD, VDDA | Core & Analog Supply | 2.0–3.6 V main power inputs; VDDA must be decoupled separately for ADC stability and noise immunity. |
| VSS, VSSA | Ground Reference | Digital and analog ground returns; separate VSSA routing minimizes ADC quantization error from digital switching noise. |
| NRST | Active-Low Reset | Asynchronous reset input; requires external pull-up and optional RC filter per ST AN2606 for ESD robustness. |
| PA0–PA15, PB0–PB15, PC13–PC15 | General-Purpose I/O | 37 total GPIOs; most support external interrupt, alternate functions (USART/I²C/SPI), and 5 V tolerance on input. |
| OSC_IN / OSC_OUT | External Crystal Interface | Connects to 4–16 MHz quartz crystal; internal load capacitors configurable via option bytes for precise clock tuning. |
| BOOT0 | Boot Mode Selection | High at reset selects system memory boot (for DFU); low selects user Flash - critical for firmware recovery sequences. |
Key Features
| Feature | Design Value |
|---|---|
| Serial Wire Debug (SWD) | 2-pin debug interface replacing JTAG - reduces PCB footprint while enabling full flash programming and real-time trace. |
| Programmable Voltage Detector (PVD) | Configurable threshold (2.2–2.9 V) triggers interrupt before brown-out - enables graceful shutdown of actuator drivers or data logging. |
| Temperature Sensor | Calibrated internal sensor (±1.5 °C accuracy) - eliminates external thermistor in ambient temperature monitoring applications. |
| CRC Calculation Unit | Hardware-accelerated CRC-32 generator - verifies firmware integrity or communication packet checksums without CPU overhead. |
| RTC with VBAT Support | Real-time clock retains time/date across main power loss using backup battery - essential for timestamped event logging in energy meters. |
| Independent & Window Watchdog | Dual watchdog architecture - independent WDG for fail-safe reset, window WDG for timing-critical software flow validation. |
Applications
| Industrial Motor Control | Smart Sensor Node |
|---|---|
Use Scenario: Closed-loop speed regulation of BLDC motors in HVAC blowers using hall-effect feedback and PWM-driven gate drivers. IC Role / Device Role / Timing Role: Main controller executing FOC algorithm, managing ADC sampling of phase currents, and generating synchronized 3-phase PWM outputs. Use Value: 36 MHz Cortex-M3 delivers sub-10 µs interrupt latency for commutation timing; 12-bit ADC resolves current ripple <10 mA at 10 A full scale. |
Use Scenario: Battery-powered environmental monitor collecting temperature, humidity, and CO₂ via I²C sensors and transmitting data over UART to gateway. IC Role / Device Role / Timing Role: System-on-chip sensor aggregator with low-power Stop mode between 10 s measurement cycles and RTC wake-up scheduling. Use Value: 37 GPIOs accommodate multiple sensor interfaces; VBAT-backed RTC maintains accurate time stamping during 5-year battery life. |
| Programmable Logic Controller (PLC) I/O Module | Energy Meter Front-End |
Use Scenario: DIN-rail mounted digital I/O expansion module with 16-channel isolated inputs and 8-channel relay outputs. IC Role / Device Role / Timing Role: Central intelligence handling opto-isolator status polling, debounce logic, and Modbus RTU over RS-485 via USART. Use Value: 3× USARTs support dual Modbus ports (master/slave); 5 V-tolerant inputs eliminate external level translators for legacy 24 V DC field wiring. |
Use Scenario: Residential electricity meter measuring active/reactive power using shunt-based current sensing and voltage divider inputs. IC Role / Device Role / Timing Role: Metrology co-processor acquiring synchronized voltage/current samples via ADC DMA and computing RMS/energy using CMSIS-DSP library. Use Value: 12-bit ADC with internal reference ensures ±0.5% metering accuracy across 2.0–3.6 V supply variation; CRC unit validates calibration constants. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 32-bit microcontroller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| STM32F030F4P6 | ARM Cortex-M0, 48 MHz, 16 KB Flash, 4 KB SRAM, no VBAT RTC or temperature sensor | Limited to basic control tasks without time-stamped logging or ambient compensation | Select when cost sensitivity outweighs need for RTC, ADC resolution, or peripheral count. |
| STM32F103CBT6 | Same package and pinout, but 128 KB Flash, 20 KB SRAM, enhanced peripherals (CAN, USB), higher temp grade (–40 to +105 °C) | Supports automotive diagnostics, CAN bus integration, and extended thermal environments | Choose when CAN interface, USB device capability, or extended temperature operation is required. |
Compared with STM32F101CBU6TR, STM32F030F4P6 offers lower cost but sacrifices RTC, temperature sensing, and ADC performance; STM32F103CBT6 provides pin-compatible upgrade path with CAN/USB and wider temperature range, increasing BOM flexibility for future-proofing.
Availability
STM32F101CBU6TR is available at Aetrix Electronics and suitable for industrial motor control, smart sensor nodes, and PLC I/O modules requiring stable component supply, long-term lifecycle assurance, and ECOPACK®-compliant packaging.
Supply support for STM32F101CBU6TR includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, specializing in microcontrollers, power management, MEMS, and automotive ICs with over 40 years of industrial-grade design heritage.
The STM32F1 series targets cost-sensitive, resource-constrained embedded applications requiring robust real-time performance, low-power operation, and broad peripheral integration - optimized for industrial automation, consumer appliances, and building controls.
FAQ
What is the maximum operating frequency and associated power consumption of STM32F101CBU6TR?
STM32F101CBU6TR operates at up to 36 MHz with typical active current of 24 mA at 3.6 V (code running from Flash, all peripherals enabled). At 8 MHz, current drops to ~9 mA under identical conditions. These values are measured per ST's DocID13586 Rev 17 Section 5.3.5, with supply decoupling per layout guidelines in AN2834.
Does STM32F101CBU6TR support in-application programming (IAP) of its Flash memory?
Yes - the device supports IAP via its built-in system memory bootloader or user application code using the Flash programming interface. Sector erase and word programming are implemented in hardware with write protection controlled by option bytes, as detailed in RM0008 Section 3.4 and PM0056 Section 2.3.
How is the 5 V-tolerant I/O capability implemented, and which pins support it?
All 37 GPIOs (PA0–PA15, PB0–PB15, PC13–PC15) are 5 V-tolerant on input only - achieved via internal clamping diodes and oxide-thickened transistors. Output levels remain 3.3 V compliant. This feature is validated per ST's characterization in DocID13586 Section 5.3.13, Table 33.
What debug interfaces does STM32F101CBU6TR provide, and what are their physical pin requirements?
It supports Serial Wire Debug (SWD) using SWCLK (PA14) and SWDIO (PA13), plus legacy JTAG (TCK/TMS/TDI/TDO/TRESET). SWD requires only two pins and a 10 kΩ pull-up on SWDIO; JTAG needs five pins. Both interfaces are accessible via standard ARM Cortex-M debug probes per RM0008 Section 27.3.
STM32F101CBU6TR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Package/Case:
- 48-UFQFN Exposed Pad
- Series:
- STM32F1
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Programmable:
- Not Verified
- Core Processor:
- ARM® Cortex®-M3
- Core Size:
- 32-Bit Single-Core
- Speed:
- 36MHz
- Connectivity:
- I2C, IrDA, LINbus, SPI, UART/USART
- Peripherals:
- DMA, PDR, POR, PVD, PWM, Temp Sensor, WDT
- Number of I/O:
- 37
- Program Memory Size:
- 128KB (128K x 8)
- Program Memory Type:
- FLASH
- EEPROM Size:
- -
- RAM Size:
- 16K x 8
- Voltage - Supply (Vcc/Vdd):
- 2V ~ 3.6V
- Data Converters:
- A/D 10x12b
- Oscillator Type:
- Internal
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
STM32F101CBU6TR FAQ
1.How can I place an order for STM32F101CBU6TR through Aetrix?
Please submit a Request for Quotation (RFQ) for STM32F101CBU6TR on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for STM32F101CBU6TR reliable?
The price and inventory of STM32F101CBU6TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STM32F101CBU6TR is usually 5 days.
3.What payment methods are accepted for STM32F101CBU6TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STM32F101CBU6TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for STM32F101CBU6TR?
STM32F101CBU6TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your STM32F101CBU6TR order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for STM32F101CBU6TR?
For technical support, including STM32F101CBU6TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STM32F101CBU6TR requirements.
6.How does Aetrix verify that STM32F101CBU6TR is sourced from the original manufacturer or authorized distributors?
All STM32F101CBU6TR products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that STM32F101CBU6TR meets industry standards.
7.What is the process for return or replacement of STM32F101CBU6TR?
All STM32F101CBU6TR units undergo pre-shipment inspection (PSI). If there is an issue with STM32F101CBU6TR, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The STM32F101CBU6TR part is unused and in its original packaging.
Return procedure for STM32F101CBU6TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
STM32F101CBU6TR Tags
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