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Silicon Labs EFM8UB20F32G-B-QFP48R
- Part No.:
- EFM8UB20F32G-B-QFP48R
- Manufacturer:
- Silicon Labs
- Category:
- Microcontrollers
- Package:
- 48-TQFP
- Datasheet:
-
EFM8UB20F32G-B-QFP48R.pdf
- Description:
- IC MCU 8BIT 32KB FLASH 48TQFP
- Quantity:
- Payment:
- Shipping:
Inventory:2,678
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Product details
Overview
EFM8UB20F32G-B-QFP48R from Silicon Labs is a crystal-less USB 2.0 full/low-speed 8-bit MCU with pipelined CIP-51 core (48 MHz), 32 KB flash, 2304 bytes RAM, 40 multifunction I/O pins, and integrated 10-bit differential ADC with temperature sensor - designed for embedded USB peripherals, dongles, and communication bridges operating at 2.65–3.6 V.
For engineers reviewing the EFM8UB20F32G-B-QFP48R datasheet, EFM8UB20F32G-B-QFP48R pinout, EFM8UB20F32G-B-QFP48R application, or EFM8UB20F32G-B-QFP48R equivalent, key selection criteria include USB clock recovery accuracy (±0.25%), on-chip 5 V-to-3.3 V LDO, dual UARTs with 3-byte FIFO, and QFP48 package compatibility with legacy 8051 toolchains and debug via C2 interface.
Technical Context
The EFM8UB20F32G-B-QFP48R implements a fully compatible 8051 instruction set with 70% of instructions executing in 1–2 clock cycles, paired with a priority crossbar for flexible peripheral routing to its 40 I/O pins. Its USB 2.0 function controller integrates a transceiver, 1 KB FIFO, and clock recovery - enabling crystal-free operation without external components.
It features two internal oscillators (48 MHz HFOSC0 with ±0.25% USB-recovered accuracy and 80 kHz LFOSC0), six 16-bit timers, five-channel PCA supporting PWM/capture/frequency output, and a 10-bit SAR ADC with 500 ksps throughput, programmable window comparator, and integrated temperature sensor - all operational during debugging.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Core | Pipelined CIP-51 8051 running up to 48 MHz; enables real-time USB packet handling and deterministic interrupt latency. |
| Flash / RAM | 32 KB in-system reprogrammable flash and 2304 bytes RAM (256 standard + 2048 XRAM); supports field firmware updates and data logging. |
| USB Interface | Full/low-speed USB 2.0 function controller with 1 KB FIFO, integrated transceiver, and clock recovery; eliminates external crystal and matching components. |
| ADC | 10-bit differential SAR ADC with 500 ksps throughput, 32-channel analog mux, and integrated temperature sensor; enables precision sensor monitoring without external ICs. |
| Oscillators | Internal 48 MHz oscillator (±0.25% with USB clock recovery) and 80 kHz low-frequency oscillator; provides accurate timing for USB, UART, and low-power suspend modes. |
| I/O & Peripherals | 40 multifunction I/O pins with flexible crossbar routing; supports dual UARTs (3-byte RX FIFO), SPI, two SMBus/I²C, 5-channel PCA, and two analog comparators. |
| Power Management | On-chip 5 V-to-3.3 V LDO regulator, brown-out detector, power-on reset, and five low-power modes (Idle/Suspend/Stop/Shutdown); simplifies power design for USB bus-powered devices. |
Pinout & Package
EFM8UB20F32G-B-QFP48R is housed in a 48-pin Quad Flat Package (QFP48) with 0.5 mm pitch, RoHS-compliant, lead-free finish, and -40°C to +85°C industrial temperature rating.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD, VREGIN, GND | Power supply inputs | VDD (2.65–3.6 V) powers digital/analog circuits; VREGIN (2.7–5.25 V) feeds internal 5V-to-3.3V LDO; GND provides reference return. |
| D+, D-, VBUS | USB physical layer | D+/D- connect directly to USB connector; VBUS detects host presence and enables USB functionality automatically. |
| C2CK, C2D | C2 debug interface | 2-wire non-intrusive in-circuit debugging using production MCU; C2D shares P3.0 in QFP48 package. |
| P0.0–P3.7, P4.0–P4.7 | General-purpose I/O | Up to 40 pins configurable as GPIO, analog input, or routed to UART/SPI/I²C/USB/CMP via priority crossbar. |
| XTAL1, XTAL2 | External crystal interface | Supports optional 0.02–30 MHz crystal for precise timing when USB clock recovery is insufficient. |
| RSTb | Active-low reset input | Drives device into reset state; weak pullup enabled; compatible with standard reset button or supervisor ICs. |
Key Features
| Feature | Design Value |
|---|---|
| Crystal-less USB operation | Integrated 48 MHz oscillator with USB clock recovery achieves ±0.25% accuracy - eliminates external crystal, load capacitors, and layout constraints. |
| Pre-loaded USB bootloader | Resides in last three flash pages; enables firmware updates over USB without external programmer - reduces BOM and field service complexity. |
| Flexible peripheral routing | Priority crossbar decoder allows any digital peripheral (UART, SPI, I²C, USB, timers) to be assigned to multiple I/O pins - maximizes PCB layout flexibility. |
| Low-power analog operation | ADC, comparators, and temperature sensor remain functional in Idle mode (220 µA @ 80 kHz); supports always-on sensing with minimal power penalty. |
| Robust debug interface | C2 interface supports full-speed, non-intrusive debugging (breakpoints, memory inspection, single-step) using production silicon - accelerates firmware validation. |
Applications
| USB HID Dongle | Medical Sensor Interface |
|---|---|
Use Scenario: Wireless keyboard/mouse dongle connecting to PC via USB with minimal external components. IC Role / Device Role: Full-speed USB function controller with HID class firmware, managing keystroke reporting and power negotiation. Use Value: Crystal-less operation reduces BOM cost and board space; integrated LDO accepts direct USB 5 V input; C2 debug enables rapid HID descriptor tuning. | Use Scenario: Portable blood glucose meter acquiring analog sensor signals and transmitting results to smartphone via USB. IC Role / Device Role: Signal acquisition MCU with 10-bit ADC, temperature compensation, and USB mass storage or CDC interface. Use Value: Integrated temperature sensor and ADC reference enable calibrated measurements; 32 KB flash stores calibration tables and USB descriptors; low-power modes extend battery life. |
| Industrial Communication Bridge | Consumer Audio Remote |
Use Scenario: Protocol translator between RS-485 fieldbus and USB host, deployed in factory automation systems. IC Role / Device Role: Dual UART bridge with hardware flow control, USB CDC ACM class implementation, and robust ESD protection on I/O. Use Value: Two UARTs with independent baud rate generators (including 3-byte RX FIFO) prevent data loss; QFP48 package supports industrial-grade PCB layout; -40°C to +85°C rating ensures reliability. | Use Scenario: IR-to-USB remote control for smart TVs, converting NEC/RC-5 commands into USB HID media keys. IC Role / Device Role: IR demodulator input (via comparator), command decoding engine, and USB HID output controller. Use Value: Two analog comparators with programmable hysteresis reliably decode IR carrier; pre-loaded USB bootloader allows over-the-air remote firmware updates. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 8-bit USB microcontroller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| EFM8UB20F64G-B-QFP48 | 64 KB flash, 4352 bytes RAM, same peripherals and pinout | Required for larger firmware images or extended data buffering in USB audio or firmware-over-USB applications | Select when >32 KB code space or >2 KB RAM is needed; identical footprint and migration path. |
| C8051F320-GQ | Legacy Silicon Labs USB MCU; 16 KB flash, no integrated LDO, requires external 3.3 V supply and crystal | Suitable for cost-sensitive, lower-complexity USB devices where crystal and regulator are already present | Choose only for legacy design reuse; lacks USB clock recovery, LDO, and modern low-power modes of EFM8UB2 series. |
Compared with EFM8UB20F64G-B-QFP48, the EFM8UB20F32G-B-QFP48R offers identical USB performance and pin compatibility at reduced memory cost; versus C8051F320-GQ, it delivers crystal-less operation, integrated regulation, and enhanced power efficiency - reducing system-level BOM and design risk.
Availability
EFM8UB20F32G-B-QFP48R is available at Aetrix Electronics and suitable for USB peripheral development, medical sensor integration, and industrial protocol bridging requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for EFM8UB20F32G-B-QFP48R 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, intelligent wireless and wired connectivity solutions for IoT, industrial, and consumer markets.
The EFM8 Universal Bee family targets cost-sensitive, USB-enabled embedded applications - delivering 8051 compatibility, integrated analog, and crystal-less USB in compact packages to accelerate time-to-market.
FAQ
What USB speed modes does the EFM8UB20F32G-B-QFP48R support?
The EFM8UB20F32G-B-QFP48R supports both full-speed (12 Mbps) and low-speed (1.5 Mbps) USB 2.0 operation as a function controller. It complies with the USB 2.0 specification and includes an integrated transceiver with configurable pull-up resistors, eliminating external components. The device does not support USB host mode or high-speed operation.
Does the EFM8UB20F32G-B-QFP48R require an external crystal for USB operation?
No, the EFM8UB20F32G-B-QFP48R does not require an external crystal for USB operation. Its internal 48 MHz oscillator achieves ±0.25% accuracy using USB clock recovery, meeting USB full-speed timing requirements without external components. An external crystal (0.02–30 MHz) is optional for applications needing tighter timing stability outside USB contexts.
What debug interface does the EFM8UB20F32G-B-QFP48R use, and how is it implemented?
The EFM8UB20F32G-B-QFP48R uses Silicon Labs' 2-wire C2 debug interface, implemented via C2CK and C2D pins (C2D shares P3.0 in QFP48). It enables non-intrusive, full-speed in-circuit debugging - including breakpoints, memory/register inspection, and single-stepping - without consuming on-chip resources. Debugging remains active while all peripherals operate.
How much RAM and flash memory does the EFM8UB20F32G-B-QFP48R provide?
The EFM8UB20F32G-B-QFP48R provides 32 KB of in-system reprogrammable flash memory and 2304 bytes of RAM (256 bytes standard 8051 RAM + 2048 bytes XRAM). This configuration supports moderate firmware complexity, USB descriptor storage, and real-time data buffering - sufficient for HID devices, sensor interfaces, and protocol bridges.
What power supply options does the EFM8UB20F32G-B-QFP48R support?
The EFM8UB20F32G-B-QFP48R supports dual power inputs: VDD (2.65–3.6 V) for core/digital/analog circuits and VREGIN (2.7–5.25 V) for its integrated 5 V-to-3.3 V LDO regulator. This allows direct connection to USB 5 V bus (via VREGIN) while powering the MCU core at 3.3 V - simplifying power architecture and eliminating external regulators in bus-powered designs.
EFM8UB20F32G-B-QFP48R Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Silicon Labs
- Package/Case:
- 48-TQFP
- Series:
- Universal Bee
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Programmable:
- Not Verified
- Core Processor:
- CIP-51 8051
- Core Size:
- 8-Bit
- Speed:
- 48MHz
- Connectivity:
- EBI/EMI, I2C, SMBus, SPI, UART/USART, USB
- Peripherals:
- Brown-out Detect/Reset, POR, PWM, WDT
- Number of I/O:
- 40
- Program Memory Size:
- 32KB (32K x 8)
- Program Memory Type:
- FLASH
- EEPROM Size:
- -
- RAM Size:
- 2.25K x 8
- Voltage - Supply (Vcc/Vdd):
- 2.65V ~ 3.6V
- Data Converters:
- A/D 32x10b
- Oscillator Type:
- Internal
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
EFM8UB20F32G-B-QFP48R FAQ
1.How can I place an order for EFM8UB20F32G-B-QFP48R through Aetrix?
Please submit a Request for Quotation (RFQ) for EFM8UB20F32G-B-QFP48R 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 EFM8UB20F32G-B-QFP48R reliable?
The price and inventory of EFM8UB20F32G-B-QFP48R are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for EFM8UB20F32G-B-QFP48R is usually 5 days.
3.What payment methods are accepted for EFM8UB20F32G-B-QFP48R?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for EFM8UB20F32G-B-QFP48R transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for EFM8UB20F32G-B-QFP48R?
EFM8UB20F32G-B-QFP48R orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your EFM8UB20F32G-B-QFP48R 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 EFM8UB20F32G-B-QFP48R?
For technical support, including EFM8UB20F32G-B-QFP48R datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your EFM8UB20F32G-B-QFP48R requirements.
6.How does Aetrix verify that EFM8UB20F32G-B-QFP48R is sourced from the original manufacturer or authorized distributors?
All EFM8UB20F32G-B-QFP48R 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 EFM8UB20F32G-B-QFP48R meets industry standards.
7.What is the process for return or replacement of EFM8UB20F32G-B-QFP48R?
All EFM8UB20F32G-B-QFP48R units undergo pre-shipment inspection (PSI). If there is an issue with EFM8UB20F32G-B-QFP48R, 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 EFM8UB20F32G-B-QFP48R part is unused and in its original packaging.
Return procedure for EFM8UB20F32G-B-QFP48R:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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