EFM8UB20F64G-B-QFN32R - 48MHz 8051 USB MCU, 64kB Flash | Silicon Labs
N.º de pieza: EFM8UB20F64G-B-QFN32R ✓ Activo| Cant. | Precio unitario | Total |
|---|---|---|
| 1 | $4.2 | $4,20 |
| 10 | $3.78 | $37,80 |
| 100 | $3.3 | $330,00 |
| 500 | $2.85 | $1.425,00 |
| 1.000 | $2.4 | $2.400,00 |
| 3.000 | $2.05 | $6.150,00 |
EFM8UB20F64G-B-QFN32R Descripción general
A Universal Bee 8-bit MCU is a small-form-factor microcontroller that combines a legacy-compatible 8051 instruction set with modern peripherals such as USB, I2C/SMBus, SPI, and UART. It belongs to the broader category of embedded microcontrollers, which sit below microprocessors and microprocessors with caches in the system hierarchy: microcontroller -> embedded controller -> IC. Universal Bee parts specifically target cost-sensitive USB-enabled applications where 8-bit density, deterministic interrupt response, and USB 2.0 full-speed (12 Mbps) connectivity outweigh the throughput of 32-bit Cortex-M0/M0+ alternatives.
Key features of the EFM8UB20F64G-B-QFN32R include the USB 2.0 full-speed device controller with on-chip transceiver, a 10-bit 200 ksps differential SAR ADC, two on-chip low-current analog comparators with adjustable reference, brown-out reset and supply supervisor, and a hardware cipher engine for AES-128. The 32-QFN package measures 5x5 mm with an exposed pad for low thermal impedance. The device supports 2.7 V to 5.25 V supply, making it directly compatible with battery and USB bus-powered designs.
Typical applications for this part are USB HID peripherals (keyboards, mice, game controllers), USB-to-UART bridges, USB CDC virtual COM ports, industrial sensor interfaces, and low-cost consumer appliances needing USB connectivity. The combination of 64 kB code space and USB in a compact 32-QFN makes it especially attractive for space-constrained dongles and wearables.
When designing with this MCU, reserve the exposed pad (EP) for a continuous ground plane and connect it to GND through at least four thermal vias. Add a 1 uF and a 100 nF decoupling pair as close as possible to the VDD pin. The USB D+/D- traces must be 90 ohm differential, length-matched within 150 mil, and routed over a continuous ground reference for impedance control.
This page synthesizes distributor pricing, drop-in alternatives from the same EFM8UB2 family, and practical design notes that go beyond what is in the manufacturer datasheet alone.
Alternativas directas para EFM8UB20F64G-B-QFN32R — mismo encapsulado, compatible pin a pin. Se excluyen las piezas de otro encapsulado que requieren retrabajo de la PCB.
Variantes de esta serie
Modelos de la misma serie compatibles directamente con EFM8UB20F64G-B-QFN32R (mismo factor de forma y huella) — difiere en ADC, Package, Digital I/O Pins, PCA Channels, Operating Temperature.
Herramienta de comparación rápida — seleccione piezas alternativas para compararlas lado a lado:
EFM8UB20F64G-B-QFN32
✅ Sustitución directa✓ En stock
$2.15 / unidad
Ver hoja de datos →EFM8UB20F64G-A-QFN32R
✅ Sustitución directa📋 Alternativa de referencia (no en el catálogo)
EFM8UB20F64G-A-QFN32
✅ Sustitución directa📋 Alternativa de referencia (no en el catálogo)
EFM8UB20F64G-A-QFP48
✅ Sustitución directa✓ En stock
$2.18 / unidad
Ver hoja de datos →EFM8UB20F64G-B-QFN32R Valores máximos y características eléctricas
| Core Processor | CIP-51 8051 (pipelined) |
| Core Size | 8-bit |
| Maximum Clock Speed | 48 MHz |
| Program Memory (Flash) | 64 kB |
| Data RAM (XRAM) | 4 kB |
| Encapsulado | 32-QFN (5x5 mm) |
| Operating Temperature Grade | -40C to +85C (B grade) |
| Tensión de alimentación | 2.7 V to 5.25 V |
| Digital I/O Pins | 25 |
| USB Interface | USB 2.0 Full-Speed (12 Mbps) Device with on-chip transceiver |
| ADC | 10-bit differential SAR, 20 channels, 200 ksps |
| Timers | 6 x 16-bit |
| PCA Channels | 5 |
| Analog Comparators | 2 with adjustable reference |
| Communication Peripherals | I2C, SMBus, SPI, UART/USART, USB |
| Tipo de montaje | Surface Mount |
| Packaging | Tape & Reel (1,500/reel) |
Configuración de pines de EFM8UB20F64G-B-QFN32R
| Pin 1 | P2.0 — Port 2.0 GPIO |
| Pin 2 | P2.1 — Port 2.1 GPIO |
| Pin 3 | P2.2 — Port 2.2 GPIO |
| Pin 4 | P2.3 — Port 2.3 GPIO |
| Pin 5 | P2.4 — Port 2.4 GPIO |
| Pin 6 | P2.5 — Port 2.5 GPIO |
| Pin 7 | P2.6 — Port 2.6 GPIO |
| Pin 8 | P2.7 — Port 2.7 GPIO |
| Pin 9 | VBUS — USB VBUS sense input |
| Pin 10 | VDD — Supply voltage 2.7-5.25 V |
| Pin 11 | GND — Ground |
| Pin 12 | D+ — USB D+ data line |
| Pin 13 | D- — USB D- data line |
| Pin 14 | RST/C2CK — Reset / C2 clock |
| Pin 15 | P3.0/C2D — Port 3.0 / C2 data |
| Pin 16 | P3.1 — Port 3.1 GPIO |
| Pin 17 | P3.2 — Port 3.2 GPIO |
| Pin 18 | P3.3 — Port 3.3 GPIO |
| Pin 19 | P3.4 — Port 3.4 GPIO |
| Pin 20 | P3.5 — Port 3.5 GPIO |
| Pin 21 | P3.6 — Port 3.6 GPIO |
| Pin 22 | P3.7 — Port 3.7 GPIO |
| Pin 23 | P1.0 — Port 1.0 GPIO |
| Pin 24 | P1.1 — Port 1.1 GPIO |
| Pin 25 | P1.2 — Port 1.2 GPIO |
| Pin 26 | P1.3 — Port 1.3 GPIO |
| Pin 27 | P1.4 — Port 1.4 GPIO |
| Pin 28 | P1.5 — Port 1.5 GPIO |
| Pin 29 | P1.6 — Port 1.6 GPIO |
| Pin 30 | P1.7 — Port 1.7 GPIO |
| Pin 31 | P0.0 — Port 0.0 GPIO |
| Pin 32 | P0.1 — Port 0.1 GPIO |
Aplicaciones típicas
EFM8UB20F64G-B-QFN32R es adecuado para 6 aplicacións: USB HID Peripherals (Keyboard / Mouse / Game Controller), USB-to-UART Bridge / CDC Virtual COM Port, Industrial Sensor Interface Module, USB Barcode / RFID Reader Dongle, USB Audio Class (UAC) Headset Adapter, USB-Connected Wearable / Fitness Tracker.
USB HID Peripherals (Keyboard / Mouse / Game Controller)
The EFM8UB20F64G-B-QFN32R's integrated USB 2.0 Full-Speed device controller and on-chip transceiver let designers build USB HID peripherals with no external PHY and minimal BOM. Its 48 MHz CIP-51 core scans a 248-key matrix at 1000 Hz while 4 kB XRAM holds HID report buffers, and the 32-QFN 5x5 mm footprint fits inside a slim mouse or dongle enclosure. The 2.7-5.25 V range works directly from a single-cell Li-ion battery or USB bus.
Recomendado
USB-to-UART Bridge / CDC Virtual COM Port
The EFM8UB20F64G-B-QFN32R is one of the lowest-cost single-chip USB-to-UART bridges because it carries the CDC class driver in the Silicon Labs SDK and exposes a hardware UART at up to 1 Mbaud. The 64 kB Flash holds command parsers and bootloader logic; 4 kB XRAM buffers CDC packets. Designers add only a USB connector, decoupling caps, and an ESD array such as the IP4220CZ6 to ship a production dongle.
Recomendado
Industrial Sensor Interface Module
With 25 digital I/O, a 10-bit differential SAR ADC at 200 ksps, two on-chip analog comparators, and SMBus/I2C/SPI, the EFM8UB20F64G-B-QFN32R aggregates multiple sensor channels and reports over USB. Its -40C to +85C B-grade range suits factory-floor enclosures, and the hardware AES-128 block secures telemetry. The 32-QFN 5x5 mm allows the sensor module to fit inside an M12 connector body.
Recomendado
USB Barcode / RFID Reader Dongle
A barcode scanner or HF RFID reader streams bursty bursts to and from the EFM510 that pipes them over USB HID or CDC. The 48 MHz core decodes 1D/2D barcodes in firmware while the integrated USB transceiver eliminates a costly external PHY. The 32-QFN 5x5 mm footprint and sub-5 USD BOM let the reader fit in a compact handheld form factor at retail point-of-sale.
Recomendado
USB Audio Class (UAC) Headset Adapter
Engineers can implement a USB audio headset adapter using the EFM8UB20F64G-B-QFN32R's USB FS controller plus an external audio DAC such as the CS42L52-CNZ connected over I2S. The 4 kB XRAM buffers USB audio packets while the 64 kB Flash stores the HID volume buttons. The 32-QFN footprint keeps the adapter smaller than a coin cell.
Recomendado
USB-Connected Wearable / Fitness Tracker
Wearables combine a low-cost USB-charged MCU with a sensor hub; the EFM8UB20F64G-B-QFN32R fits that role with 4 kB XRAM for step counts, 6 timers for sensor sampling, and direct USB bus power at 5 V. Its 2.7-5.25 V range accepts Li-ion cells without an LDO, and the 32-QFN 5x5 mm footprint fits inside a 25 mm wearable strap module.
Recomendado
Resumen de productos recomendados
Datos de referencia de ingeniería para EFM8UB20F64G-B-QFN32R — comparación, orientación de diseño e información de cumplimiento.
Guía de selección
Comparación con alternativas
| Parámetro | Este producto | EFM8UB20F64G-B-QFN32 | EFM8UB20F64G-A-QFN32R | EFM8UB20F64G-A-QFN32 | EFM8UB20F64G-A-QFP48 |
|---|---|---|---|---|---|
| Brand | Silicon Labs | Silicon Labs | Silicon Labs | Silicon Labs | Silicon Labs |
| Package | 32-QFN (5x5 mm) | 32-QFN (5x5 mm) - same | 32-QFN (5x5 mm) - same | 32-QFN (5x5 mm) - same | 48-QFP - DIFFERENT (not drop-in) |
| Core | CIP-51 8051 8-bit | CIP-51 8051 | CIP-51 8051 | CIP-51 8051 | CIP-51 8051 |
| Clock Speed | 48 MHz | 48 MHz | 48 MHz | 48 MHz | 48 MHz |
| Flash | 64 kB | 64 kB | 64 kB | 64 kB | 64 kB |
| RAM | 4 kB XRAM | 4 kB | 4 kB | 4 kB | 4 kB |
| USB | USB 2.0 FS device, on-chip transceiver | USB 2.0 FS | USB 2.0 FS | USB 2.0 FS | USB 2.0 FS |
| Temperature Grade | -40C to +85C (B grade) | -40C to +85C (B) | -40C to +85C (A) | -40C to +85C (A) | -40C to +85C (A) |
| Packaging | Tape & Reel | Tray | Tape & Reel | Tray | Tray |
Diferenciadores clave
- Single-chip USB FS with on-chip transceiver (frente a EFM8UB20F64G-B-QFN32)
- Production-aligned B temperature grade (frente a EFM8UB20F64G-A-QFN32R)
- Compact 32-QFN 5x5 mm with full USB HID stack (frente a EFM8UB20F64G-A-QFP48)
Notas de diseño
Connect the exposed pad (EP) of the 32-QFN to a continuous ground plane through at least four thermal vias (0.3 mm drill, 0.5 mm pitch). Place a 1 uF and a 100 nF decoupling pair within 2 mm of the VDD pin (pin 10) and a second 100 nF within 5 mm of the VBUS pin (pin 9) to meet USB in-rush specifications.
Route the USB D+ (pin 12) and D- (pin 13) as a 90 ohm differential pair with length matching within 150 mil microns and over an unbroken ground reference. Avoid routing the pair near switching nodes or crystals; keep total length under 25 mm and add a common-mode choke near the connector if compliance fails.
Do not omit the VBUS pin sense resistor or tie VBUS directly to VDD, because USB hosts can supply 5.25 V transients that exceed the part's absolute maximum. Insert a 10 kohm divider on VBUS to the P3.0/VBUS sense pin and use software to gate USB attach. Also enable the brown-out reset at 3.0 V for bus-powered designs that may brown out at enumeration.
Keep the internal 48 MHz oscillator traces short; if you use an external crystal on XTAL1/XTAL2, place the crystal within 5 mm of the pins with a guard ground ring. The internal oscillator is trimmed for USB Full-Speed accuracy, so most designs can omit the crystal entirely, saving cost and PCB area.
Información de cumplimiento
RoHS and lead-free per Silicon Labs EFM8UB2 datasheet and product page. USB-IF compliance testing is the integrator's responsibility. Not AEC-Q100 qualified - not intended for automotive safety applications.
