C8051F126 - 50MHz 8051 MCU, 128KB Flash, 100-TQFP | Silicon Labs
MPN: C8051F126 ✓ Hoạt độngC8051F126 Tóm tắt
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.
Bộ thay thế dễ dàng lắp đặt cho C8051F126 — cùng gói, chân-to-chân tương thích. Các bộ phận yêu cầu hàn PCB bị loại trừ.
C8051F120-GQ
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
C8051F127-GQ
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
C8051F124-GQR
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
C8051F126-GQ
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
C8051F126R
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
C8051F130-GQ
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
C8051F126 Tỷ lệ tối đa & tính chất điện
| 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 |
| Nhiệt độ hoạt động | -40 C to +85 C (industrial) |
| Internal Oscillator | 24.5 MHz +/- 2% |
| Hộp | 100-pin TQFP (14x14 mm, TQFP-100) |
| Kiểu lắp đặt | Surface Mount |
| Trạng thái RoHS | Compliant |
| Programming Interface | JTAG / C2 (in-system programmable Flash) |
Cấu hình chân C8051F126
| Chân 1 | P0.0 — Port 0 bit 0 (digital I/O or analog) |
| Chân 2 | P0.1 — Port 0 bit 1 (digital I/O or analog) |
| Chân 3 | P0.2 — Port 0 bit 2 (digital I/O or analog) |
| Chân 4 | P0.3 — Port 0 bit 3 (digital I/O or analog) |
| Chân 5 | P0.4 — Port 0 bit 4 (digital I/O or analog) |
| Chân 6 | P0.5 — Port 0 bit 5 (digital I/O or analog) |
| Chân 7 | P0.6 — Port 0 bit 6 (digital I/O or analog) |
| Chân 8 | P0.7 — Port 0 bit 7 (digital I/O or analog) |
| Chân 9 | P1.0 — Port 1 bit 0 (digital I/O or analog) |
| Chân 10 | P1.1 — Port 1 bit 1 (digital I/O or analog) |
| Chân 11 | P1.2 — Port 1 bit 2 (digital I/O or analog) |
| Chân 12 | P1.3 — Port 1 bit 3 (digital I/O or analog) |
| Chân 13 | P1.4 — Port 1 bit 4 (digital I/O or analog) |
| Chân 14 | P1.5 — Port 1 bit 5 (digital I/O or analog) |
| Chân 15 | P1.6 — Port 1 bit 6 (digital I/O or analog) |
| Chân 16 | P1.7 — Port 1 bit 7 (digital I/O or analog) |
| Chân 17 | P2.0 — Port 2 bit 0 (digital I/O) |
| Chân 18 | P2.1 — Port 2 bit 1 (digital I/O) |
| Chân 19 | P2.2 — Port 2 bit 2 (digital I/O) |
| Chân 20 | P2.3 — Port 2 bit 3 (digital I/O) |
| Chân 21 | P2.4 — Port 2 bit 4 (digital I/O) |
| Chân 22 | P2.5 — Port 2 bit 5 (digital I/O) |
| Chân 23 | P2.6 — Port 2 bit 6 (digital I/O) |
| Chân 24 | P2.7 — Port 2 bit 7 (digital I/O) |
| Chân 25 | P3.0 — Port 3 bit 0 (digital I/O) |
| Chân 26 | P3.1 — Port 3 bit 1 (digital I/O) |
| Chân 27 | P3.2 — Port 3 bit 2 (digital I/O) |
| Chân 28 | P3.3 — Port 3 bit 3 (digital I/O) |
| Chân 29 | P3.4 — Port 3 bit 4 (digital I/O) |
| Chân 30 | P3.5 — Port 3 bit 5 (digital I/O) |
| Chân 31 | P3.6 — Port 3 bit 6 (digital I/O) |
| Chân 32 | P3.7 — Port 3 bit 7 (digital I/O) |
| Chân 33 | P4.0 — Port 4 bit 0 (digital I/O) |
| Chân 34 | P4.1 — Port 4 bit 1 (digital I/O) |
| Chân 35 | P4.2 — Port 4 bit 2 (digital I/O) |
| Chân 36 | P4.3 — Port 4 bit 3 (digital I/O) |
| Chân 37 | P4.4 — Port 4 bit 4 (digital I/O) |
| Chân 38 | P4.5 — Port 4 bit 5 (digital I/O) |
| Chân 39 | P4.6 — Port 4 bit 6 (digital I/O) |
| Chân 40 | P4.7 — Port 4 bit 7 (digital I/O) |
| Chân 41 | P5.0 — Port 5 bit 0 (digital I/O) |
| Chân 42 | P5.1 — Port 5 bit 1 (digital I/O) |
| Chân 43 | P5.2 — Port 5 bit 2 (digital I/O) |
| Chân 44 | P5.3 — Port 5 bit 3 (digital I/O) |
| Chân 45 | P5.4 — Port 5 bit 4 (digital I/O) |
| Chân 46 | P5.5 — Port 5 bit 5 (digital I/O) |
| Chân 47 | P5.6 — Port 5 bit 6 (digital I/O) |
| Chân 48 | P5.7 — Port 5 bit 7 (digital I/O) |
| Chân 49 | P6.0 — Port 6 bit 0 (digital I/O) |
| Chân 50 | P6.1 — Port 6 bit 1 (digital I/O) |
| Chân 51 | P6.2 — Port 6 bit 2 (digital I/O) |
| Chân 52 | P6.3 — Port 6 bit 3 (digital I/O) |
| Chân 53 | P6.4 — Port 6 bit 4 (digital I/O) |
| Chân 54 | P6.5 — Port 6 bit 5 (digital I/O) |
| Chân 55 | P6.6 — Port 6 bit 6 (digital I/O) |
| Chân 56 | P6.7 — Port 6 bit 7 (digital I/O) |
| Chân 57 | P7.0 — Port 7 bit 0 (digital I/O) |
| Chân 58 | P7.1 — Port 7 bit 1 (digital I/O) |
| Chân 59 | P7.2 — Port 7 bit 2 (digital I/O) |
| Chân 60 | P7.3 — Port 7 bit 3 (digital I/O) |
| Chân 61 | P7.4 — Port 7 bit 4 (digital I/O) |
| Chân 62 | P7.5 — Port 7 bit 5 (digital I/O) |
| Chân 63 | P7.6 — Port 7 bit 6 (digital I/O) |
| Chân 64 | P7.7 — Port 7 bit 7 (digital I/O) |
| Chân 65 | DAC0 — DAC0 analog output |
| Chân 66 | DAC1 — DAC1 analog output |
| Chân 67 | VREF — Voltage reference input |
| Chân 68 | VREFGND — Voltage reference ground |
| Chân 69 | AGND — Analog ground |
| Chân 70 | AV+ — Analog supply |
| Chân 71 | XTAL1 — External oscillator input |
| Chân 72 | XTAL2 — External oscillator output |
| Chân 73 | RST — Device reset (active low) |
| Chân 74 | TCK — JTAG test clock |
| Chân 75 | TMS — JTAG test mode select |
| Chân 76 | TDI — JTAG test data input |
| Chân 77 | TDO — JTAG test data output |
| Chân 78 | C2CK — C2 debug clock |
| Chân 79 | C2D — C2 debug data |
| Chân 80 | VBAT — Battery backup supply |
| Chân 81 | VDD — Digital supply (3.3 V) |
| Chân 82 | VDD — Digital supply (3.3 V) |
| Chân 83 | VDD — Digital supply (3.3 V) |
| Chân 84 | VDD — Digital supply (3.3 V) |
| Chân 85 | GND — Digital ground |
| Chân 86 | GND — Digital ground |
| Chân 87 | GND — Digital ground |
| Chân 88 | GND — Digital ground |
| Chân 89 | AIN0.0 — Analog input / GPIO |
| Chân 90 | AIN0.1 — Analog input / GPIO |
| Chân 91 | AIN0.2 — Analog input / GPIO |
| Chân 92 | AIN0.3 — Analog input / GPIO |
| Chân 93 | AIN0.4 — Analog input / GPIO |
| Chân 94 | AIN0.5 — Analog input / GPIO |
| Chân 95 | AIN0.6 — Analog input / GPIO |
| Chân 96 | AIN0.7 — Analog input / GPIO |
| Chân 97 | CP0+ — Comparator 0 non-inverting input |
| Chân 98 | CP0- — Comparator 0 inverting input |
| Chân 99 | CP1+ — Comparator 1 non-inverting input |
| Chân 100 | CP1- — Comparator 1 inverting input |
Ứng dụng tiêu biểu
C8051F126 phù hợp cho 7 Áp dụngs: 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.
Được đề xuất
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.
Được đề xuất
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.
Được đề xuất
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.
Được đề xuất
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.
Được đề xuất
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.
Được đề xuất
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.
Được đề xuất
Tóm tắt các sản phẩm được đề xuất
Dữ liệu tham khảo kỹ thuật cho C8051F126 — so sánh, hướng dẫn thiết kế và thông tin tuân thủ.
Hướng dẫn chọn lựa
So sánh với các sản phẩm thay thế
| Tham số | Sản phẩm này | 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 |
Bảo phân biệt quan trọng
- Doubles Flash vs C8051F120 in identical footprint (vsC8051F120-GQ)
- Higher-precision 12-bit ADC vs 10-bit on standard part (vsC8051F127-GQ)
- Extended temperature grade variant in same family (vsC8051F130-GQ)
Ghi chú thiết kế
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.
Thông tin tuân thủ
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.
