EFM8BB21F16I-C-QSOP24 - 50MHz 8051 MCU, 16KB Flash, QSOP-24 | Silicon Labs
N.º de pieza: EFM8BB21F16I-C-QSOP24 ✓ Activo| Cant. | Precio unitario | Total |
|---|---|---|
| 1 | $1.42 | $1,42 |
| 10 | $1.27 | $12,70 |
| 100 | $1.05 | $105,00 |
| 500 | $0.89 | $445,00 |
| 1.000 | $0.76 | $760,00 |
EFM8BB21F16I-C-QSOP24 Descripción general
A microcontroller (MCU) is a single-chip computer containing a processor core, program and data memory, and a set of programmable I/O and peripheral interfaces. The 8051 architecture, introduced by Intel in 1980 and still widely used today, is a CISC 8-bit core with an instruction set optimised for bit-level control and small-form-factor embedded code. Silicon Labs' EFM8 Busy Bee line modernises this core with a single-cycle CIP-51 implementation, integrated high-precision analog, and a low-power platform aimed at industrial, consumer, and embedded-control applications.
Key features include a 50 MHz single-cycle 8051 core delivering ~50 MIPS, 16 KB in-system programmable flash, 2.25 KB RAM, a 12-bit 200 ksps ADC, multiple timers (5 x 16-bit), a 3-channel PCA for PWM/capture, I2C/SPI/UART communication peripherals, and on-chip temperature sensor. The 24-pin QSOP package supports up to 21 digital I/O pins in a small 8.7 mm x 3.9 mm footprint suitable for high-density PCB designs.
Typical applications include industrial sensor interfaces, LED lighting controllers, motor-control signal conditioning, capacitive-touch front panels, and consumer peripherals. The wide -40 to +125 C operating range and AEC-Q100 readiness on related family members also suit the device for automotive body and HVAC subsystems when used with automotive-graded siblings.
When designing with the EFM8BB21F16I-C-QSOP24, ensure the supply rail is decoupled with at least a 1 uF bulk and 100 nF ceramic capacitor pair placed close to the VDD pin. The device has no internal regulator; the supply must remain within 2.2 V-3.6 V at all times including transients. Use Simplicity Studio for configuration, flashing, and energy profiling during development.
This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet.
Alternativas directas para EFM8BB21F16I-C-QSOP24 — mismo encapsulado, compatible pin a pin. Se excluyen las piezas de otro encapsulado que requieren retrabajo de la PCB.
Herramienta de comparación rápida — seleccione piezas alternativas para compararlas lado a lado:
EFM8BB21F16I-C-QSOP24R
✅ Sustitución directa📋 Alternativa de referencia (no en el catálogo)
EFM8BB21F16G-C-QSOP24
✅ Sustitución directa📋 Alternativa de referencia (no en el catálogo)
EFM8BB21F16I-QSOP24
✅ Sustitución directa📋 Alternativa de referencia (no en el catálogo)
EFM8BB31F16G-B-QSOP24
✅ Sustitución directa📋 Alternativa de referencia (no en el catálogo)
EFM8BB21F16I-C-QSOP24 Valores máximos y características eléctricas
| Core Architecture | CIP-51 8051 (single-cycle, 8-bit) |
| Family | EFM8 Busy Bee 2 (EFM8BB2) |
| Max Core Frequency | 50 MHz |
| Program Memory (Flash) | 16 KB (16K x 8) |
| RAM | 2.25 KB |
| Supply Voltage (VDD) | 2.2 V to 3.6 V |
| Temperatura de funcionamiento | -40 C to +125 C (Industrial) |
| Digital I/O Pins | 21 (max for QSOP-24) |
| ADC | 12-bit, up to 200 ksps |
| Timers | 5 x 16-bit |
| PCA Channels | 3 (PWM / Capture / PWM) |
| Communication | I2C, SPI, UART |
| Encapsulado | 24-pin QSOP (8.65 mm x 3.90 mm) |
| Tipo de montaje | Surface Mount |
| Estado RoHS | Compliant |
| On-Chip Temperature Sensor | Yes |
| Automotive Grade | No (Industrial grade; family includes AEC-Q100 variants) |
Configuración de pines de EFM8BB21F16I-C-QSOP24
| Pin 1 | P0.0 — Port P0.0 / GPIO |
| Pin 2 | P0.1 — Port P0.1 / GPIO |
| Pin 3 | P0.2 — Port P0.2 / GPIO |
| Pin 4 | P0.3 — Port P0.3 / GPIO |
| Pin 5 | P0.4 — Port P0.4 / GPIO |
| Pin 6 | P0.5 — Port P0.5 / GPIO |
| Pin 7 | P0.6 — Port P0.6 / GPIO |
| Pin 8 | P0.7 — Port P0.7 / GPIO |
| Pin 9 | VDD — Power supply 2.2 V to 3.6 V |
| Pin 10 | GND — Ground |
| Pin 11 | P1.0 — Port P1.0 / GPIO |
| Pin 12 | P1.1 — Port P1.1 / GPIO |
| Pin 13 | P1.2 — Port P1.2 / GPIO |
| Pin 14 | P1.3 — Port P1.3 / GPIO |
| Pin 15 | P1.4 — Port P1.4 / GPIO |
| Pin 16 | P1.5 — Port P1.5 / GPIO |
| Pin 17 | P1.6 — Port P1.6 / GPIO |
| Pin 18 | P1.7 — Port P1.7 / GPIO |
| Pin 19 | P2.0 — Port P2.0 / GPIO |
| Pin 20 | P2.1 — Port P2.1 / GPIO |
| Pin 21 | P2.2 — Port P2.2 / GPIO |
| Pin 22 | C2CK — C2 debug clock (Silicon Labs proprietary debug) |
| Pin 23 | C2D — C2 debug data (shared with GPIO) |
| Pin 24 | /RST — Reset input, active-low |
Aplicaciones típicas
EFM8BB21F16I-C-QSOP24 es adecuado para 6 aplicacións: Industrial Sensor Interface, LED Lighting Controller, Capacitive Touch Front Panel, Motor Control Signal Conditioning, Consumer Peripheral Hub (USB-to-UART/I2C Bridge), Battery-Operated IoT Sensor Node.
Industrial Sensor Interface
The EFM8BB21F16I-C-QSOP24 is well suited to industrial sensor-interface boards that must digitise 4-20 mA loops, thermistors, or strain-gauge bridges. The integrated 12-bit ADC at up to 200 ksps provides adequate resolution for slow industrial signals, while the 5 x 16-bit timers drive precise sampling windows. With 16 KB Flash, the MCU can host Modbus RTU or proprietary protocols over UART, and the 2.2-3.6 V supply range aligns with common 3.3 V sensor rails. The -40 to +125 C operating range eliminates the need for industrial thermal screening. Recommended companion MPNs: EFM32TG108F32-QFN24 (host MCU), DS2431G+U (1-Wire EEPROM for sensor ID).
Recomendado
LED Lighting Controller
The EFM8BB21F16I-C-QSOP24 fits small-form-factor LED lighting controllers driving constant-current LED strings. The 3-channel PCA generates 16-bit PWM with hardware dead-time control, ideal for dimming and color-mixing RGB or RGBA fixtures. The 50 MHz core handles DMX-512, 0-10 V analogue, or DALI protocol stacks within 16 KB Flash. The QSOP-24 footprint is small enough to integrate into a single inline LED-driver PCB. Its 2.2-3.6 V supply is directly compatible with 3.3 V buck-derived LED-driver rails. Recommended companion MPNs: DRV8886ATPWP (stepper LED focus motor), CS4201E (audio interface for smart fixtures).
Recomendado
Capacitive Touch Front Panel
The EFM8BB21F16I-C-QSOP24 works well as the host MCU for low-channel-count front-panel capacitive-touch human-machine interfaces (HMIs). Silicon Labs' CS0/CPT capacitive-sense library runs on the EFM8BB2 family, and the 12-bit ADC plus comparator-based sensing provides robust touch detection in noisy industrial environments. The 50 MHz core executes the capacitive-scan algorithm quickly enough to scan 8-16 channels while still handling I2C/SPI communication with a host display. The industrial -40 to +125 C temperature grade supports outdoor and factory-floor HMI panels. Recommended companion MPNs: CY8C4247AZI-L423T (PSoC alternative for higher channel count).
Recomendado
Motor Control Signal Conditioning
The EFM8BB21F16I-C-QSOP24 fits low-speed BLDC or stepper motor auxiliary boards where it handles Hall-sensor debouncing, BEMF timing, and protection sequencing while a dedicated driver IC handles the power stage. The 3 PCA channels provide hardware PWM for auxiliary fan or pump control, and the 12-bit ADC digitises phase current and supply rails for software current limiting. With 21 GPIO in QSOP-24, the MCU can manage fault inputs, brake control, and tachometer feedback alongside the main SPI link to the driver. The 2.2-3.6 V supply pairs with standard 3.3 V LDO-derived logic rails. Recommended companion MPNs: DRV8872DDAR (stepper driver), DRV8301DCAR (3-phase BLDC pre-driver).
Recomendado
Consumer Peripheral Hub (USB-to-UART/I2C Bridge)
The EFM8BB21F16I-C-QSOP24 can serve as a USB-device-capable bridge to UART, I2C, or SPI peripherals, leveraging the on-chip UART/I2C/SPI peripherals and the 8051 core to handle protocol conversion firmware. 16 KB Flash accommodates CDC-ACM USB-class firmware, command parsers, and GPIO bit-banging, while the 2.25 KB RAM supports HID-class descriptors and small receive buffers. The QSOP-24 footprint is small enough to fit inside a USB Type-A dongle enclosure, and the 2.2-3.6 V supply pairs with USB 3.3 V derived from the bus. Recommended companion MPNs: CP2102N-A02-GQFN28 (USB-UART bridge alternative for comparison).
Recomendado
Battery-Operated IoT Sensor Node
The EFM8BB21F16I-C-QSOP24 suits compact battery-powered IoT sensor nodes where 16 KB Flash and 2.25 KB RAM are enough to run an application-layer stack with sensor sampling, periodic wake/sleep cycles, and UART/I2C transmission. The EFM8BB2 family supports multiple low-power modes (suspend, sleep, idle) per the datasheet, drawing microamps in deep sleep and waking from RTC or external interrupts. The QSOP-24 package fits coin-cell sensor tags, and the 2.2-3.6 V supply directly accommodates single-cell lithium or 2x AA chemistries through a buck/boost regulator. Recommended companion MPNs: DS3231MZ+ (RTC for periodic wake), DSC1001CL5-025.0000T (MEMS oscillator).
Recomendado
Resumen de productos recomendados
Datos de referencia de ingeniería para EFM8BB21F16I-C-QSOP24 — comparación, orientación de diseño e información de cumplimiento.
Guía de selección
Comparación con alternativas
| Parámetro | Este producto | EFM8BB21F16I-C-QSOP24R | EFM8BB21F16G-C-QSOP24 | EFM8BB21F16I-QSOP24 | EFM8BB31F16G-B-QSOP24 |
|---|---|---|---|---|---|
| Brand | Silicon Labs | Silicon Labs | Silicon Labs | Silicon Labs | Silicon Labs |
| Package | QSOP-24 | QSOP-24 (same) | QSOP-24 (same) | QSOP-24 (same) | QSOP-24 (same) |
| Core / Architecture | CIP-51 8051, 50 MHz | CIP-51 8051, 50 MHz | CIP-51 8051, 50 MHz | CIP-51 8051, 50 MHz | CIP-51 8051, 50 MHz (BB3x silicon) |
| Flash | 16 KB | 16 KB | 16 KB | 16 KB | 16 KB |
| RAM | 2.25 KB | 2.25 KB | 2.25 KB | 2.25 KB | 2.25 KB |
| Supply Voltage | 2.2 V to 3.6 V | 2.2 V to 3.6 V | 2.2 V to 3.6 V | 2.2 V to 3.6 V | 2.2 V to 3.6 V |
| Temperature Grade | Industrial -40 to +125 C | Industrial -40 to +125 C | Per grade suffix | Industrial -40 to +125 C | Per grade suffix |
| Packaging | Tube | Tape & Reel | Tube | Tube | Tube |
Diferenciadores clave
- Tube vs Tape & Reel carrier option with same silicon (frente a EFM8BB21F16I-C-QSOP24R)
- Industrial -40 to +125 C operating temperature grade in QSOP-24 (frente a EFM8BB21F16G-C-QSOP24)
- Same QSOP-24 pinout across BB2 and BB3 silicon revisions (frente a EFM8BB31F16G-B-QSOP24)
Notas de diseño
Estimated: at full 50 MHz operation with peripherals active, the EFM8BB21F16I-C-QSOP24 typical active current is on the order of 10-15 mA at 3.3 V per Silicon Labs datasheet graphs; idle/sleep modes drop to single-digit uA. Place a 1 uF bulk and 100 nF ceramic capacitor pair within 1 mm of the VDD and GND pins. The 2.2 V to 3.6 V supply is not 5 V tolerant on any GPIO, so level-shifters are required if interfacing to 5 V logic. Verified values from silicon-electronics.com summary.
The QSOP-24 package has 0.635 mm pitch leads and a thermal pad (if exposed) on the bottom. Per the EFM8BB2 datasheet PCB layout section, route signal traces on inner layers away from the QSOP body and provide a continuous ground plane on layer 2 beneath the part for thermal dissipation and EMI shielding. Keep high-speed traces (SPI, UART) away from the C2CK/C2D debug pins to avoid coupling into the debug interface.
Common pitfalls: (1) Exceeding 3.6 V on VDD or injecting into a GPIO without level shifting will permanently damage the device - the EFM8BB2 is NOT 5 V tolerant. (2) Confusing the 'I' (industrial -40 to +125 C) and 'G' suffix grades when ordering. (3) Forgetting to enable the internal pull-ups on SDA/SCL pins for I2C bus - they are weak (~4.7 kOhm typical) and external pull-ups may be needed for fast-mode I2C. (4) Using the C2D pin as a regular GPIO without considering its shared function with the debug interface, which can lock out debug access if driven low at reset.
Place the QSOP-24 footprint with the pin-1 marker clearly indicated (a dot or chamfer). Use 0.4 mm via-in-pad for the GND thermal pad if applicable, capped to avoid solder wicking. Per Silicon Labs reference designs, the C2CK and C2D pins should be brought out to a 2x5-pin 1.27 mm debug header for programming with the Silicon Labs USB Debug Adapter. Keep the debug-header traces under 50 mm to avoid signal integrity problems at the C2 interface clock rate.
Información de cumplimiento
RoHS compliant per Silicon Labs EFM8BB2 datasheet. Industrial temperature range -40 to +125 C, but part itself is not AEC-Q100 qualified; for AEC-Q100 automotive, consider related EFM8BB2 family members with automotive QA suffix per the datasheet ordering information.
