C8051F126R

Overview

The C8051F126R is a mixed-signal microcontroller from Silicon Labs featuring a high-speed 8051 core with up to 50 MIPS throughput. It integrates 128 kB of in-system programmable Flash memory and 8448 bytes of internal data RAM. The device includes a 10-bit SAR ADC with up to 8 external inputs, two 12-bit DACs, and two analog comparators. Digital peripherals consist of hardware SMBus, SPI, and dual UART interfaces alongside a programmable counter array. It operates within a voltage range of 2.7 V to 3.6 V and supports temperatures from -40 °C to +85 °C.

Feature Summary

• High-performance pipelined 8051 core executing 70% of instructions in one or two system clocks
• Integrated analog subsystem with 10-bit ADC, dual 12-bit DACs, and analog comparators
• On-chip JTAG debug circuitry supporting full-speed non-intrusive in-circuit debugging
• Programmable digital I/O crossbar allowing flexible peripheral-to-pin assignment

Applications

• Portable medical equipment
• Weigh scales
• Test equipment
• Fiber optic systems

Procurement Notes

Verify the specific suffix 'R' against the manufacturer's official documentation to confirm tape-and-reel packaging status. Ensure compatibility with the required operating temperature range and voltage supply specifications for the target application environment before finalizing procurement.

Selection Notes

Select this component for applications requiring high analog integration within an 8051 architecture. The inclusion of dual 12-bit DACs and a 10-bit ADC distinguishes it from variants lacking these specific analog peripherals. Consider the 100-pin TQFP package size when designing PCB layouts for sufficient pin access.

Part Context

This part belongs to the C8051F12x family of highly integrated mixed-signal microcontrollers. These devices are designed as standalone system-on-chip solutions, combining a fast CPU with extensive on-chip memory and analog peripherals to reduce external component count.

Replacement Considerations

Silicon Labs recommends the EFM8BB31F64G-QFN32 as a replacement for the C8051F126 series due to End of Life announcements.