C8051F704-GQ

Overview

The C8051F704-GQ is a mixed-signal ISP Flash microcontroller from the Silicon Labs C8051F70x family, housed in a 48-pin TQFP package. It features a high-speed pipelined 8051 core operating at up to 25 MHz with 25 MIPS throughput. The device integrates 16 kB of in-system programmable Flash memory, 512 bytes of internal data RAM, and 32 bytes of data EEPROM. Key analog peripherals include a 10-bit ADC supporting up to 500 ksps, a capacitive sense module, and an analog comparator. Digital interfaces encompass UART, SMBus, SPI, four general-purpose timers, and a PCA.

Feature Summary

• Capacitive Sense Module: Supports buttons, sliders, wheels, proximity sensing, and touch screens with auto-scan capabilities.
• High-Speed 8051 Core: Pipelined architecture executes most instructions in one or two system clocks for efficient processing.
• On-Chip Debug Circuitry: Facilitates full-speed, non-intrusive in-system debugging without external emulators.
• Flexible Clock Sources: Includes a precision internal oscillator and supports external crystal, RC, or clock inputs.

Applications

• Capacitive touch sensing applications
• Portable medical equipment
• Weigh scales
• Test equipment

Procurement Notes

Verify the component status before procurement as this specific part number may be subject to End-of-Life (EOL) notices. Confirm that the 48-pin TQFP package matches your PCB footprint requirements. Ensure compatibility with existing firmware development tools, such as 8-bit Microcontroller Studio or Keil C51, for programming and debugging workflows.

Selection Notes

Select this MCU for designs requiring integrated capacitive sensing alongside standard mixed-signal functions. The 16 kB Flash capacity suits moderate code sizes, while the 10-bit ADC resolution meets basic data acquisition needs. Consider the 48-pin TQFP form factor for space-constrained boards where QFN options are unsuitable. Evaluate power consumption in idle modes if battery operation is critical.

Part Context

This component belongs to the C8051F70x/71x series of fully integrated mixed-signal microcontrollers. These devices combine a high-speed 8051 CPU with extensive on-chip peripherals, reducing the need for external components. The series is designed for cost-sensitive applications requiring analog-to-digital conversion and digital control in a single chip.

Replacement Considerations

Silicon Labs recommends alternative solutions as this family is not recommended for new designs. Consult official documentation for current compatible replacements within the EFM8 or newer C8051 families that offer updated feature sets and long-term availability.

FAQ

What is the maximum sampling rate of the ADC?

The integrated 10-bit Analog-to-Digital Converter supports sampling rates of up to 500 ksps.

Does the device support capacitive touch sensing?

Yes, it includes a dedicated Capacitance to Digital Converter (CS0) capable of handling up to 38 input channels for touch and proximity sensing.

How is the device debugged?

It features on-chip debug circuitry that allows for full-speed, non-intrusive in-system debugging via the C2 interface without requiring external emulation hardware.