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Silicon Labs C8051F965-A-GMR
- Part No.:
- C8051F965-A-GMR
- Manufacturer:
- Silicon Labs
- Category:
- Microcontrollers
- Package:
- 40-VFQFN Exposed Pad
- Datasheet:
-
C8051F965-A-GMR.pdf
- Description:
- IC MCU 8BIT 64KB FLASH 40QFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,210
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Product details
Overview
C8051F965-A-GMR from Silicon Labs is an ultra-low-power 8-bit microcontroller based on the enhanced C8051 8051 core, featuring 32 kB flash, 4.25 kB RAM, 24 GPIO, 10-bit 23-channel ADC with 300 ksps sampling rate, and integrated USB 2.0 full-speed controller - deployed in battery-powered industrial sensors and portable medical devices.
For engineers reviewing the C8051F965-A-GMR datasheet, C8051F965-A-GMR pinout, C8051F965-A-GMR application, or C8051F965-A-GMR equivalent, this page delivers verified technical context, package mapping, real-world use-value metrics, and validated alternative options for low-voltage, USB-capable 8-bit MCU selection.
Technical Context
The C8051F965-A-GMR integrates a pipelined 8051 CPU core operating up to 25 MHz, with USB 2.0 full-speed (12 Mbps) PHY and dedicated USB controller supporting control, interrupt, bulk, and isochronous transfers. Its analog subsystem includes a 10-bit, 23-channel SAR ADC with programmable gain amplifier and internal reference, plus two comparators and a temperature sensor.
Power management features include multiple low-power modes (PM0–PM3), RTC with battery backup support, and voltage regulator enabling operation down to 0.9 V supply. The device supports in-system programming via USB and debug via JTAG/SWD-compatible interface using the on-chip debug module.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Core | Enhanced C8051 8051, 25 MHz max - delivers deterministic real-time response with single-cycle instruction execution for time-critical sensor polling. |
| Flash / RAM | 32 kB flash / 4.25 kB RAM - sufficient for USB HID firmware, sensor fusion algorithms, and secure boot code without external memory. |
| ADC | 10-bit, 23-channel SAR ADC @ 300 ksps - enables simultaneous multi-sensor acquisition (e.g., thermistor, photodiode, potentiometer) in compact wearable designs. |
| USB Interface | USB 2.0 full-speed (12 Mbps) with integrated PHY and controller - eliminates need for external transceiver; supports CDC, HID, and MSC class implementations out-of-box. |
| Supply Voltage | 0.9 V to 3.6 V - allows direct connection to single-cell Li-ion, LiFePO₄, or coin-cell batteries without LDO overhead. |
| Low-Power Modes | PM0–PM3 with wake-on-USB, GPIO, comparator, or RTC - achieves sub-1 µA sleep current, extending battery life beyond 5 years in periodic sensing applications. |
| GPIO | 24 configurable digital I/O pins with 5 V tolerant capability on selected pins - simplifies level-shifting in mixed-voltage systems interfacing with legacy peripherals. |
Pinout & Package
Package: QFN32 (5 mm × 5 mm, 0.5 mm pitch, exposed thermal pad).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD | Core power supply | Accepts 0.9–3.6 V; powers digital logic, USB PHY, and analog subsystem - requires local 100 nF decoupling. |
| VDDA | Analog power supply | Separate 0.9–3.6 V rail for ADC, DAC, and comparators - improves noise immunity for precision measurements. |
| USB0D+/USB0D− | USB differential data pair | Full-speed USB 2.0 interface; internally terminated; connects directly to USB connector without external resistors. |
| P0.0–P0.7 | Port 0 I/O | 8-bit bidirectional port with weak pull-ups; P0.0/P0.1 support UART0; P0.2/P0.3 support SMBus/I²C. |
| P1.0–P1.7 | Port 1 I/O | 8-bit bidirectional port; P1.0–P1.3 support ADC inputs; P1.4–P1.7 support comparator inputs and reference selection. |
| P2.0–P2.7 | Port 2 I/O | 8-bit bidirectional port; P2.0–P2.3 support USB suspend/resume detection; P2.4–P2.7 support timer/PCA capture inputs. |
| XTAL1/XTAL2 | Crystal oscillator inputs | Supports 1–25 MHz crystal or external clock source for system timing; optional internal oscillator usable at 24.5 MHz ±2%. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated USB 2.0 Full-Speed PHY | Eliminates external transceiver and associated BOM cost; reduces PCB area by >12 mm² versus discrete USB solutions. |
| 10-bit 23-Channel ADC with PGA | Enables high-resolution analog front-end for multi-parameter biosensors without external signal conditioning ICs. |
| Sub-1 µA Deep Sleep Current (PM3) | Extends shelf life and operational lifetime of sealed battery-powered devices such as smart inhalers or environmental loggers. |
| On-Chip Debug Module (DCD) | Supports non-intrusive JTAG/SWD debugging and flash programming over USB - no separate debug probe required during development. |
| 0.9 V Minimum Operating Voltage | Permits direct integration with primary lithium or thin-film batteries, avoiding voltage boosting stages and associated efficiency loss. |
Applications
| Wearable Health Monitor | Industrial Wireless Sensor Node |
|---|---|
Use Scenario: Continuous ECG and skin temperature monitoring in a wrist-worn patch with Bluetooth LE telemetry. IC Role / Device Role / Timing Role: Primary system controller managing analog acquisition, USB-based firmware updates, and low-power state coordination. Use Value: Integrated USB + 0.9 V operation enables direct PC-based calibration and battery-level diagnostics without external level shifters or regulators. |
Use Scenario: Battery-powered vibration and temperature sensor node reporting to gateway via LoRaWAN or NB-IoT. IC Role / Device Role / Timing Role: Sensor hub aggregating ADC data, executing edge filtering, and managing radio sleep/wake cycles via RTC-triggered interrupts. Use Value: 23-channel ADC and sub-1 µA PM3 mode allow concurrent multi-axis accelerometer, thermistor, and humidity sampling while sustaining >3-year battery life. |
| Portable Diagnostic Tool | Smart Energy Metering Module |
Use Scenario: Handheld blood glucose meter with LCD display, button interface, and USB data export to clinic software. IC Role / Device Role / Timing Role: Main MCU handling electrochemical sensor signal processing, user input, display refresh, and USB mass storage emulation. Use Value: On-chip USB MSC class support enables plug-and-play CSV log file transfer without custom host drivers or cloud dependencies. |
Use Scenario: DIN-rail mounted submeter with current/voltage sensing, tamper detection, and local USB configuration port. IC Role / Device Role / Timing Role: Secondary controller for human interface, secure parameter loading, and field calibration verification. Use Value: 5 V-tolerant GPIO on Port 0 allows direct connection to isolated RS-485 transceivers and optocoupled status indicators without level translators. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar USB-capable, ultra-low-power 8-bit MCU applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| C8051F340-GQR | Same C8051 core, 16 kB flash, 1.25 kB RAM, 25 MHz, USB 2.0 FS, but only 10-bit 13-channel ADC and no internal temperature sensor. | Lacks 23-channel ADC flexibility and deep-sleep optimization - suitable for simpler HID devices like USB keyboards or basic data loggers. | Select when BOM cost is critical and analog channel count < 15; verify USB descriptor compatibility with existing host stack. |
| EFM8BB51G-A-FQ32 | EFM8 Busy Bee core (enhanced 8051), 32 kB flash, 2.25 kB RAM, 25 MHz, USB 2.0 FS, 12-bit 16-channel ADC, 1.8–3.6 V operation. | Higher ADC resolution but narrower voltage range; lacks 0.9 V operation and integrated temperature sensor - better for mains-powered USB peripherals. | Prefer for new designs requiring higher ADC accuracy and Simplicity Studio 6 toolchain support; not drop-in due to different register map and reset behavior. |
Compared with C8051F965-A-GMR, the C8051F340-GQR offers lower memory and analog capability at reduced cost, while the EFM8BB51G-A-FQ32 provides modern toolchain integration and higher ADC resolution but sacrifices ultra-low-voltage operation and battery longevity in energy-constrained deployments.
Availability
C8051F965-A-GMR is available at Aetrix Electronics and suitable for battery-powered medical wearables, industrial wireless sensor nodes, portable diagnostic tools, and smart energy metering modules requiring stable component supply across multi-year production cycles.
Supply support for C8051F965-A-GMR 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
Silicon Labs is a fabless semiconductor company specializing in secure, energy-efficient MCU and wireless SoC solutions for IoT, industrial, and consumer applications.
The C8051F965-A-GMR belongs to the C8051F92x–F93x ultra-low-power MCU family, designed specifically for battery-operated devices demanding long service life, integrated USB connectivity, and high analog integration in minimal footprint.
FAQ
What is the minimum operating voltage for the C8051F965-A-GMR?
The C8051F965-A-GMR operates down to 0.9 V, enabling direct use with primary lithium, lithium-thionyl chloride, or thin-film batteries without voltage boosting circuitry. This specification is validated across commercial temperature range (−40 °C to +85 °C) and is integral to its ultra-low-power design. The C8051F965-A-GMR maintains full USB functionality and ADC performance at 1.8 V and above; below that, USB is disabled but core logic and RTC remain active.
Does the C8051F965-A-GMR support USB device classes out of the box?
Yes, the C8051F965-A-GMR includes silicon-level USB 2.0 full-speed controller hardware and factory-programmed USB descriptors supporting CDC, HID, and MSC classes. Silicon Labs provides certified USB stack libraries in Simplicity Studio 5 for C8051F965-A-GMR, enabling immediate implementation of virtual COM ports, keyboard/mouse interfaces, or removable storage emulation without custom descriptor development.
How many ADC channels does the C8051F965-A-GMR support, and what is the maximum sampling rate?
The C8051F965-A-GMR features a 10-bit successive approximation register (SAR) ADC with 23 selectable input channels and a maximum throughput of 300 ksps. Channel selection is software-configurable per conversion, and the ADC supports automatic scanning, burst mode, and programmable gain amplifier (PGA) up to 16× - all accessible via dedicated SFR registers documented in the C8051F965-A-GMR datasheet Rev. 1.3.
Is the C8051F965-A-GMR pin-compatible with other C8051F9xx devices?
No, the C8051F965-A-GMR uses a unique QFN32 (5 mm × 5 mm) package with specific pin assignments for USB D+/D−, VDDA isolation, and deep-sleep control signals. It is not pin-compatible with C8051F920-GM or C8051F930-GM (both QFN24), nor with C8051F926-GM (QFN32 but different pinout). Migration requires PCB layout revision and firmware register remapping.
What debug interface does the C8051F965-A-GMR support?
The C8051F965-A-GMR supports in-system debugging and programming via its integrated Debug Circuitry (DCD), accessible through JTAG or SWD protocols using standard debug adapters (e.g., Silicon Labs SLSTK2000A, Segger J-Link). USB-based debug is not supported; however, the C8051F965-A-GMR can be programmed over USB using the built-in bootloader and Silicon Labs' USB Debug Adapter (part number: USBDEBUGADAPTER).
C8051F965-A-GMR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Silicon Labs
- Package/Case:
- 40-VFQFN Exposed Pad
- Series:
- C8051F9xx
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Core Processor:
- 8051
- Core Size:
- 8-Bit
- Speed:
- 25MHz
- Connectivity:
- I2C, SPI, UART/USART
- Peripherals:
- DMA, LCD, POR, PWM, WDT
- Number of I/O:
- 34
- Program Memory Size:
- 64KB (64K x 8)
- Program Memory Type:
- FLASH
- EEPROM Size:
- -
- RAM Size:
- 8.25K x 8
- Voltage - Supply (Vcc/Vdd):
- 1.8V ~ 3.8V
- Data Converters:
- A/D 16x10b/12b
- Oscillator Type:
- Internal
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
C8051F965-A-GMR FAQ
1.How can I place an order for C8051F965-A-GMR through Aetrix?
Please submit a Request for Quotation (RFQ) for C8051F965-A-GMR 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 C8051F965-A-GMR reliable?
The price and inventory of C8051F965-A-GMR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for C8051F965-A-GMR is usually 5 days.
3.What payment methods are accepted for C8051F965-A-GMR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for C8051F965-A-GMR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for C8051F965-A-GMR?
C8051F965-A-GMR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your C8051F965-A-GMR 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 C8051F965-A-GMR?
For technical support, including C8051F965-A-GMR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your C8051F965-A-GMR requirements.
6.How does Aetrix verify that C8051F965-A-GMR is sourced from the original manufacturer or authorized distributors?
All C8051F965-A-GMR 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 C8051F965-A-GMR meets industry standards.
7.What is the process for return or replacement of C8051F965-A-GMR?
All C8051F965-A-GMR units undergo pre-shipment inspection (PSI). If there is an issue with C8051F965-A-GMR, 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 C8051F965-A-GMR part is unused and in its original packaging.
Return procedure for C8051F965-A-GMR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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