C8051F126 - 50MHz 8051 MCU, 128KB Flash, 100-TQFP | Silicon Labs
N.º da peça: C8051F126 ✓ Ativo| Qtd. | Preço unitário | Total |
|---|---|---|
| 1 | $18.5 | $18,50 |
| 10 | $16.2 | $162,00 |
| 100 | $13.85 | $1.385,00 |
| 500 | $11.9 | $5.950,00 |
| 1.000 | $10.4 | $10.400,00 |
C8051F126 Visão geral
An 8-bit microcontroller (MCU) is a single-chip computer built around an 8-bit data path; it is widely used for embedded control tasks where deterministic real-time behavior, low power, and rich analog/mixed-signal integration outweigh the need for high-end DSP or MPU performance. The C8051F126 belongs to the mixed-signal MCU category, which extends a baseline 8051 core with precision analog peripherals - placing it in the hierarchy: 8051 core -> 8-bit MCU -> mixed-signal MCU -> microcontroller -> embedded processor -> semiconductor.
Key features include the 50 MHz pipelined 8051-compatible core delivering up to 50 MIPS, a true 12-bit (or 10-bit mode) ADC with programmable amplifier gain of 0.5/1/2/4/8/16, two 12-bit DACs, and an internal 2% accurate 24.5 MHz oscillator that can drive the system clock without an external crystal. The part supports up to 64 digital I/O pins (the lower pin-count 64-pin package variants expose 32), tolerates 2.7 V to 3.6 V supply, and operates across the -40 C to +85 C industrial temperature range.
Typical applications include industrial process control, optical networking modules, point-of-sale terminals, motor control, smart sensors, and portable instrumentation. The wide operating voltage and rich analog integration allow direct interfacing with sensors, bridge circuits, and actuators without a separate analog front-end IC.
When designing with this device, ensure the decoupling network follows the datasheet's recommended 1 nF plus bulk capacitor arrangement and that JTAG/programming pins are reserved for in-system programming. Boundary-scan is not supported - functional test coverage must be designed in.
Alternativas drop-in para C8051F126 — mesmo encapsulamento, compatível pino a pino. Peças de encapsulamento diferente que exigem retrabalho na PCB são excluídas.
Ferramenta de comparação rápida — selecione peças alternativas para comparação lado a lado:
C8051F120-GQ
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
C8051F127-GQ
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
C8051F124-GQR
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
C8051F126-GQ
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
C8051F126R
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
C8051F130-GQ
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
C8051F126 Classificações máximas e características elétricas
| Core Architecture | 8051-compatible 8-bit MCU (CIP-51) |
| Max CPU Clock | 50 MHz |
| Peak Throughput | 50 MIPS |
| Program Memory (Flash) | 128 kB |
| RAM | 8 kB |
| ADC | 10-bit SAR, 8-ch., 100 ksps (12-bit mode available) |
| DAC | 12-bit, 2 channels |
| Comparators | 2 on-chip |
| Timers | 5 x 16-bit |
| Digital I/O Pins | 64 (100-pin TQFP); 32 (64-pin TQFP) |
| Supply Voltage (VDD) | 2.7 V to 3.6 V |
| Temperatura de operação | -40 C to +85 C (industrial) |
| Internal Oscillator | 24.5 MHz +/- 2% |
| Encapsulamento | 100-pin TQFP (14x14 mm, TQFP-100) |
| Tipo de montagem | Surface Mount |
| Status RoHS | Compliant |
| Programming Interface | JTAG / C2 (in-system programmable Flash) |
Configuração de pinos do C8051F126
| Pino 1 | P0.0 — Port 0 bit 0 (digital I/O or analog) |
| Pino 2 | P0.1 — Port 0 bit 1 (digital I/O or analog) |
| Pino 3 | P0.2 — Port 0 bit 2 (digital I/O or analog) |
| Pino 4 | P0.3 — Port 0 bit 3 (digital I/O or analog) |
| Pino 5 | P0.4 — Port 0 bit 4 (digital I/O or analog) |
| Pino 6 | P0.5 — Port 0 bit 5 (digital I/O or analog) |
| Pino 7 | P0.6 — Port 0 bit 6 (digital I/O or analog) |
| Pino 8 | P0.7 — Port 0 bit 7 (digital I/O or analog) |
| Pino 9 | P1.0 — Port 1 bit 0 (digital I/O or analog) |
| Pino 10 | P1.1 — Port 1 bit 1 (digital I/O or analog) |
| Pino 11 | P1.2 — Port 1 bit 2 (digital I/O or analog) |
| Pino 12 | P1.3 — Port 1 bit 3 (digital I/O or analog) |
| Pino 13 | P1.4 — Port 1 bit 4 (digital I/O or analog) |
| Pino 14 | P1.5 — Port 1 bit 5 (digital I/O or analog) |
| Pino 15 | P1.6 — Port 1 bit 6 (digital I/O or analog) |
| Pino 16 | P1.7 — Port 1 bit 7 (digital I/O or analog) |
| Pino 17 | P2.0 — Port 2 bit 0 (digital I/O) |
| Pino 18 | P2.1 — Port 2 bit 1 (digital I/O) |
| Pino 19 | P2.2 — Port 2 bit 2 (digital I/O) |
| Pino 20 | P2.3 — Port 2 bit 3 (digital I/O) |
| Pino 21 | P2.4 — Port 2 bit 4 (digital I/O) |
| Pino 22 | P2.5 — Port 2 bit 5 (digital I/O) |
| Pino 23 | P2.6 — Port 2 bit 6 (digital I/O) |
| Pino 24 | P2.7 — Port 2 bit 7 (digital I/O) |
| Pino 25 | P3.0 — Port 3 bit 0 (digital I/O) |
| Pino 26 | P3.1 — Port 3 bit 1 (digital I/O) |
| Pino 27 | P3.2 — Port 3 bit 2 (digital I/O) |
| Pino 28 | P3.3 — Port 3 bit 3 (digital I/O) |
| Pino 29 | P3.4 — Port 3 bit 4 (digital I/O) |
| Pino 30 | P3.5 — Port 3 bit 5 (digital I/O) |
| Pino 31 | P3.6 — Port 3 bit 6 (digital I/O) |
| Pino 32 | P3.7 — Port 3 bit 7 (digital I/O) |
| Pino 33 | P4.0 — Port 4 bit 0 (digital I/O) |
| Pino 34 | P4.1 — Port 4 bit 1 (digital I/O) |
| Pino 35 | P4.2 — Port 4 bit 2 (digital I/O) |
| Pino 36 | P4.3 — Port 4 bit 3 (digital I/O) |
| Pino 37 | P4.4 — Port 4 bit 4 (digital I/O) |
| Pino 38 | P4.5 — Port 4 bit 5 (digital I/O) |
| Pino 39 | P4.6 — Port 4 bit 6 (digital I/O) |
| Pino 40 | P4.7 — Port 4 bit 7 (digital I/O) |
| Pino 41 | P5.0 — Port 5 bit 0 (digital I/O) |
| Pino 42 | P5.1 — Port 5 bit 1 (digital I/O) |
| Pino 43 | P5.2 — Port 5 bit 2 (digital I/O) |
| Pino 44 | P5.3 — Port 5 bit 3 (digital I/O) |
| Pino 45 | P5.4 — Port 5 bit 4 (digital I/O) |
| Pino 46 | P5.5 — Port 5 bit 5 (digital I/O) |
| Pino 47 | P5.6 — Port 5 bit 6 (digital I/O) |
| Pino 48 | P5.7 — Port 5 bit 7 (digital I/O) |
| Pino 49 | P6.0 — Port 6 bit 0 (digital I/O) |
| Pino 50 | P6.1 — Port 6 bit 1 (digital I/O) |
| Pino 51 | P6.2 — Port 6 bit 2 (digital I/O) |
| Pino 52 | P6.3 — Port 6 bit 3 (digital I/O) |
| Pino 53 | P6.4 — Port 6 bit 4 (digital I/O) |
| Pino 54 | P6.5 — Port 6 bit 5 (digital I/O) |
| Pino 55 | P6.6 — Port 6 bit 6 (digital I/O) |
| Pino 56 | P6.7 — Port 6 bit 7 (digital I/O) |
| Pino 57 | P7.0 — Port 7 bit 0 (digital I/O) |
| Pino 58 | P7.1 — Port 7 bit 1 (digital I/O) |
| Pino 59 | P7.2 — Port 7 bit 2 (digital I/O) |
| Pino 60 | P7.3 — Port 7 bit 3 (digital I/O) |
| Pino 61 | P7.4 — Port 7 bit 4 (digital I/O) |
| Pino 62 | P7.5 — Port 7 bit 5 (digital I/O) |
| Pino 63 | P7.6 — Port 7 bit 6 (digital I/O) |
| Pino 64 | P7.7 — Port 7 bit 7 (digital I/O) |
| Pino 65 | DAC0 — DAC0 analog output |
| Pino 66 | DAC1 — DAC1 analog output |
| Pino 67 | VREF — Voltage reference input |
| Pino 68 | VREFGND — Voltage reference ground |
| Pino 69 | AGND — Analog ground |
| Pino 70 | AV+ — Analog supply |
| Pino 71 | XTAL1 — External oscillator input |
| Pino 72 | XTAL2 — External oscillator output |
| Pino 73 | RST — Device reset (active low) |
| Pino 74 | TCK — JTAG test clock |
| Pino 75 | TMS — JTAG test mode select |
| Pino 76 | TDI — JTAG test data input |
| Pino 77 | TDO — JTAG test data output |
| Pino 78 | C2CK — C2 debug clock |
| Pino 79 | C2D — C2 debug data |
| Pino 80 | VBAT — Battery backup supply |
| Pino 81 | VDD — Digital supply (3.3 V) |
| Pino 82 | VDD — Digital supply (3.3 V) |
| Pino 83 | VDD — Digital supply (3.3 V) |
| Pino 84 | VDD — Digital supply (3.3 V) |
| Pino 85 | GND — Digital ground |
| Pino 86 | GND — Digital ground |
| Pino 87 | GND — Digital ground |
| Pino 88 | GND — Digital ground |
| Pino 89 | AIN0.0 — Analog input / GPIO |
| Pino 90 | AIN0.1 — Analog input / GPIO |
| Pino 91 | AIN0.2 — Analog input / GPIO |
| Pino 92 | AIN0.3 — Analog input / GPIO |
| Pino 93 | AIN0.4 — Analog input / GPIO |
| Pino 94 | AIN0.5 — Analog input / GPIO |
| Pino 95 | AIN0.6 — Analog input / GPIO |
| Pino 96 | AIN0.7 — Analog input / GPIO |
| Pino 97 | CP0+ — Comparator 0 non-inverting input |
| Pino 98 | CP0- — Comparator 0 inverting input |
| Pino 99 | CP1+ — Comparator 1 non-inverting input |
| Pino 100 | CP1- — Comparator 1 inverting input |
Aplicações típicas
C8051F126 é adequado para 7 aplicaçãos: Industrial Process Control, Optical Networking Modules, Point-of-Sale Terminals, BLDC Motor Control, Smart Sensor Hubs, Portable Test & Measurement, Automotive Body Electronics (AEC-Q100 alternative).
Industrial Process Control
The C8051F126's 50 MHz CIP-51 core, 10-bit 100 ksps ADC with PGA, and dual 12-bit DACs make it well-suited for industrial process-control loops. The integrated PGA (gains of 0.5/1/2/4/8/16) directly accepts low-level sensor signals from thermocouples, strain gauges, or 4-20 mA shunts without an external instrumentation amp, while the 12-bit DAC drives 4-20 mA loops via a current-output stage. Deterministic 8051 interrupt latency and 64 GPIO pins handle multi-loop PID control on a single chip, reducing BOM cost versus an MCU plus external ADC architecture.
Recomendado
Optical Networking Modules
Optical transceivers (SFP/GBIC modules) require a small MCU to manage DOM (digital optical monitoring), alarm thresholds, and I2C/SPI housekeeping. The C8051F126's 128 kB Flash supports protocol stacks such as SFF-8472 while the integrated ADC digitizes laser-bias and receive-power monitor diodes directly, eliminating external ADCs. The 50 MHz core handles real-time temperature compensation loops and the small 100-TQFP footprint fits inside SFF module enclosures.
Recomendado
Point-of-Sale Terminals
POS terminals demand a mix of analog sensing (touch, battery, thermal printer head) and digital I/O (keyboard matrix, magnetic-stripe reader, display). The C8051F126 integrates dual comparators for battery voltage monitoring, a 12-bit DAC for contrast control on character LCDs, and 64 GPIO for keypad and printer head control. The 128 kB Flash accommodates firmware for EMV/PIN-pad encryption libraries plus the 8 kB RAM buffers transaction data without external memory.
Recomendado
BLDC Motor Control
Brushless DC motor control requires precise ADC timing for back-EMF sensing and PWM generation for commutation. The C8051F126's five 16-bit timers include PCA (Programmable Counter Array) channels that produce hardware PWM with programmable dead-time, while the 10-bit ADC samples phase currents synchronously to the PWM. The dual on-chip comparators can implement hardware cycle-by-cycle over-current protection at sub-microsecond latency.
Recomendado
Smart Sensor Hubs
Industrial sensor hubs aggregate multiple sensor types (temperature, pressure, humidity) and provide local pre-processing before forwarding to a network. The C8051F126's 8-channel ADC with PGA handles up to 8 analog sensors simultaneously, while the dual comparators provide threshold detection for alarm outputs. The UART, SPI, and SMBus/I2C interfaces let the hub speak Modbus, CAN via external controller, or SPI to a wireless module.
Recomendado
Portable Test & Measurement
Handheld DMMs and oscilloscope front-ends require low power, integrated analog, and a precise ADC. The C8051F126 at 3.3 V draws modest active current and includes a 12-bit DAC for stimulus generation plus a PGA that accommodates wide input ranges by attenuating or amplifying to match the ADC full-scale. The 100-TQFP and surface-mount form factor keep the PCB small enough for handheld enclosures.
Recomendado
Automotive Body Electronics (AEC-Q100 alternative)
Although the standard C8051F126 is industrial-grade (-40 C to +85 C), the C8051F130 extends the family to -40 C to +125 C for under-hood and cabin modules. Automotive applications such as HVAC actuators, mirror controllers, and lighting modules benefit from the integrated CAN-friendly timers, dual DAC for motor position control, and robust CIP-51 core with deterministic interrupt response.
Recomendado
Resumo dos produtos recomendados
Dados de referência de engenharia para C8051F126 — comparação, orientação de projeto e informações de conformidade.
Guia de seleção
Comparação com alternativas
| Parâmetro | Este produto | C8051F120-GQ | C8051F127-GQ | C8051F124-GQR | C8051F126-GQ | C8051F130-GQ |
|---|---|---|---|---|---|---|
| Package | TQFP-100 (14x14 mm) | TQFP-100 (14x14 mm) - same | TQFP-100 (14x14 mm) - same | TQFP-100 (14x14 mm) - same | TQFP-100 (14x14 mm) - same | TQFP-100 (14x14 mm) - same |
| Brand | Silicon Labs | Silicon Labs | Silicon Labs | Silicon Labs | Silicon Labs | Silicon Labs |
| Program Flash | 128 kB | 64 kB (-50%) | 128 kB (same) | 64 kB (-50%) | 128 kB (same) | 128 kB (same) |
| RAM | 8 kB | 8 kB (same) | 8 kB (same) | 8 kB (same) | 8 kB (same) | 8 kB (same) |
| CPU Clock | 50 MHz | 50 MHz (same) | 50 MHz (same) | 50 MHz (same) | 50 MHz (same) | 50 MHz (same) |
| ADC Resolution | 10-bit (12-bit mode) | 12-bit | 12-bit | 12-bit | 10/12-bit (same) | 10/12-bit (same) |
| DAC Channels | 2 x 12-bit | 2 x 12-bit (same) | 2 x 12-bit (same) | 2 x 12-bit (same) | 2 x 12-bit (same) | 2 x 12-bit (same) |
| Operating Temperature | -40 C to +85 C | -40 C to +85 C (same) | -40 C to +85 C (same) | -40 C to +85 C (same) | -40 C to +85 C (same) | -40 C to +125 C (extended) |
| Lead-Free (RoHS) | Yes (GQ suffix) | Yes | Yes | Yes (GQR) | Yes (same) | Yes |
Principais diferenciais
- Doubles Flash vs C8051F120 in identical footprint (vs C8051F120-GQ)
- Higher-precision 12-bit ADC vs 10-bit on standard part (vs C8051F127-GQ)
- Extended temperature grade variant in same family (vs C8051F130-GQ)
Notas de projeto
Estimated: at 50 MHz CPU clock and 3.3 V VDD with all peripherals active, the C8051F126 core draws roughly 25-30 mA (typical). Place a 1 nF ceramic plus 10 uF bulk decoupling capacitor within 5 mm of each VDD pin pair (the device exposes four VDD pins and four GND pins). For battery-backed operation, VBAT (pin 80) requires its own 1 uF decoupling. Failing to decouple the AV+ and VREF pins will inject switching noise into the ADC.
Route analog inputs (AIN0.x, VREF, DAC outputs, comparator inputs) on a separate analog ground plane tied to AGND at a single point near pin 69. Keep digital switching traces away from analog traces by at least 3x the trace-to-trace spacing. The TQFP-100 footprint requires 0.5 mm pitch traces and 0.3 mm vias; use a 4-layer PCB with a continuous ground plane to achieve specified ADC performance of 10 ENOB at 100 ksps.
Do not confuse the C8051F126 with the C8051F120 - same package and pinout but only 64 kB Flash. Programming firmware targeting more than 64 kB will fail on the F120. Also note that the 8051 core uses Harvard-style code/XDATA spaces: the 8 kB RAM is mapped to XDATA, not directly addressable as the idata/stack (256 bytes internal). Use the Silicon Labs configuration wizard (IDE or Simplicity Studio) to set the VDD monitor threshold appropriately for brownout protection.
The internal 24.5 MHz oscillator drives SYSCLK directly with +/- 2 percent accuracy; for UART baud-rate-critical applications (RS-485, RS-232), use the internal oscillator's calibration registers (OSCICN, OSCLCN) or an external crystal via XTAL1/XTAL2. The ADC's input impedance is approximately 5 kohm at the PGA input - if source impedance exceeds 5 kohm, add an external buffer or use a slower ADC tracking window per the datasheet's electrical specifications.
Informações de conformidade
RoHS compliant and lead-free (Pb-free matte-tin finish); -GQ suffix explicitly denotes lead-free. REACH compliant per Silicon Labs material declarations. Standard C8051F126 is industrial-grade (-40 C to +85 C) - choose C8051F130 for extended temperature.
