C8051F040-GQ

Overview

The C8051F040-GQ is an 8-bit mixed-signal microcontroller from the Silicon Labs C8051F04x family, featuring a high-speed 8051 core operating at up to 25 MHz. It integrates 64 kB of in-system programmable Flash memory and 4352 bytes of internal data RAM. The device includes a 12-bit SAR ADC with 13 external inputs, two 12-bit DACs, three analog comparators, and a precision voltage reference. Digital peripherals comprise a Bosch CAN 2.0B controller, hardware SMBus, SPI, dual UARTs, and multiple timers. It operates on a supply voltage of 2.7 V to 3.6 V within a temperature range of –40 °C to +85 °C.

Feature Summary

• Integrates a high-speed pipelined 8051 core capable of executing 70% of the instruction set in one or two system clocks for improved throughput.
• Features a 12-bit SAR ADC with programmable gain amplifier and a high-voltage difference amplifier for precise signal acquisition.
• Includes on-chip JTAG debug circuitry supporting non-intrusive in-circuit debugging with breakpoints and watchpoints.
• Provides extensive connectivity through integrated CAN 2.0B, SMBus, SPI, and dual UART serial communication interfaces.

Applications

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

Procurement Notes

Verify component status before procurement as this part is marked Not Recommended for New Designs. Confirm package type matches project requirements, typically 100-pin TQFP. Check for End of Life announcements and Last Time Buy dates. Ensure development tools support the CIP-51 architecture. Validate that the 2.7V to 3.6V supply range meets system power constraints.

Selection Notes

Select this MCU for applications requiring high analog integration alongside standard digital control. The 12-bit ADC and dual DACs suit precision measurement tasks. Consider the 100-pin package for maximum I/O availability. Evaluate if the 25 MHz performance meets real-time processing needs. Verify compatibility with existing CAN and UART protocols. Assess if the legacy 8051 architecture aligns with long-term maintenance strategies.

Part Context

This component belongs to the C8051F04x series of highly integrated mixed-signal microcontrollers. It utilizes the CIP-51 core, which offers enhanced performance over traditional 8051 designs. The series emphasizes analog capabilities, including multiple ADC resolutions and comparators. It supports both internal and external clock sources for flexible system timing configurations.

Replacement Considerations

Silicon Labs recommends the EFM32PG26B301F2048IL136 or other EFR32PG26 Series 2 MCUs as replacements. These alternatives belong to the Analog-Intensive MCU category. Verify pinout compatibility and software migration efforts when transitioning to the recommended ARM-based solutions.

FAQ

What is the resolution of the primary ADC on the C8051F040?

The C8051F040 features a 12-bit SAR ADC (ADC0) with 13 external inputs and a programmable throughput up to 100 ksps.

Does the C8051F040 include digital-to-analog converters?

Yes, it includes two 12-bit DACs that can synchronize outputs to timers for jitter-free waveform generation.

What communication interfaces are available on this MCU?

It provides a Bosch CAN 2.0B controller, hardware SMBus, SPI, and two concurrent UART serial ports.