EFM8BB21F16I-C-QSOP24 - 50MHz 8051 MCU, 16KB Flash, QSOP-24 | Silicon Labs
MPN: EFM8BB21F16I-C-QSOP24 ✓ NakahandaEFM8BB21F16I-C-QSOP24 Ulas
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.
Mga alternatibo na pwedeng ilagay na EFM8BB21F16I-C-QSOP24 — parehas na package, pin-to-pin na katugmang. Hindi kasama ang mga bahagi ng iba't-ibang package na nangangailangan ng pagpapaayos ng PCB.
EFM8BB21F16I-C-QSOP24R
✅ Drop-In📋 Alternatibo na Reference (hindi sa katalogo)
EFM8BB21F16G-C-QSOP24
✅ Drop-In📋 Alternatibo na Reference (hindi sa katalogo)
EFM8BB21F16I-QSOP24
✅ Drop-In📋 Alternatibo na Reference (hindi sa katalogo)
EFM8BB31F16G-B-QSOP24
✅ Drop-In📋 Alternatibo na Reference (hindi sa katalogo)
EFM8BB21F16I-C-QSOP24 Mga Pinakamataas na Rating at Electrical Characteristics
| 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 |
| Temperature na Operasyon | -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 |
| Packhaging | 24-pin QSOP (8.65 mm x 3.90 mm) |
| Uri ng Pagpapasok | Surface Mount |
| Tindminan RoHS | Compliant |
| On-Chip Temperature Sensor | Yes |
| Automotive Grade | No (Industrial grade; family includes AEC-Q100 variants) |
Pin Configuration ng 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 |
Tipikal na mga Gamit
EFM8BB21F16I-C-QSOP24 ay nararapat para sa 6 aplikasyons: 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).
Inirekomenda
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).
Inirekomenda
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).
Inirekomenda
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).
Inirekomenda
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).
Inirekomenda
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).
Inirekomenda
Buod ng mga Inirekomendang Produkto
Impormasyon ng Talumpati sa Engineering for EFM8BB21F16I-C-QSOP24 — ikabit, gabay sa disenyo, at impormasyon ng pagsunod sa kautusan.
Paunawang Hanapin
Ikabit sa Mga Alternatibo
| Parametro | Ito ang 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 |
Pangunahing mga Pagkakaiba
- Tube vs Tape & Reel carrier option with same silicon (kumpara saEFM8BB21F16I-C-QSOP24R)
- Industrial -40 to +125 C operating temperature grade in QSOP-24 (kumpara saEFM8BB21F16G-C-QSOP24)
- Same QSOP-24 pinout across BB2 and BB3 silicon revisions (kumpara saEFM8BB31F16G-B-QSOP24)
Talaan ng Disenyo
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.
Impormasyon ng Pagsunod sa Kautusan
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.
