C8051F705-GQ

Overview

The C8051F705-GQ is a mixed-signal ISP Flash MCU from Silicon Labs, featuring a high-speed 8051 core with up to 25 MIPS throughput at 25 MHz. It includes 16 kB of in-system programmable Flash memory and 512 bytes of internal data RAM. The device integrates a 10-bit ADC supporting up to 500 ksps, a capacitance-to-digital converter for touch sensing, and an analog comparator. It operates on a supply voltage of 1.8 to 3.6 V and is housed in a 64-pin TQFP package.

Feature Summary

• Capacitance-to-digital converter supports buttons, sliders, wheels, proximity, and touch screen sensing with auto-scan capabilities.
• On-chip debug circuitry facilitates full speed, non-intrusive in-system debugging without requiring external emulators.
• High-speed pipelined 8051 core executes 70% of instructions in one or two system clocks for efficient processing.
• Integrated 10-bit ADC provides flexible reference options and built-in temperature sensing for precise analog measurements.

Applications

• Touch screen sensing interfaces
• Capacitive button and slider controls
• Proximity detection systems
• Data acquisition applications

Procurement Notes

Verify the component against the official datasheet specifications before integration. Confirm that the 64-pin TQFP package matches the design requirements. Ensure the operating voltage range of 1.8 to 3.6 V aligns with the target power supply. Check for any specific ordering suffixes that may affect pinout or functionality.

Selection Notes

Select this MCU for designs requiring integrated capacitive sensing alongside standard microcontroller functions. The inclusion of an on-chip debugger reduces development costs by eliminating the need for separate emulation hardware. Consider the 1.8 to 3.6 V supply range when designing power management circuits for portable or battery-operated devices.

Part Context

This part belongs to the C8051F70x/71x family of mixed-signal ISPs Flash MCUs. These devices are designed for applications needing high integration of analog and digital peripherals within a compact footprint. The family emphasizes ease of use through comprehensive on-chip debug features and flexible clocking options.

Replacement Considerations

Consult the official datasheet for confirmed substitute part numbers within the same product family. Verify compatibility regarding pinout, memory size, and peripheral availability before transitioning to alternative components.

FAQ

What is the maximum conversion rate of the integrated ADC?

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

Does the C8051F705-GQ require an external emulator for debugging?

No, the device features on-chip debug circuitry that allows for full speed, non-intrusive in-system debugging without an external emulator.

What types of inputs does the capacitance-to-digital converter support?

The capacitance-to-digital converter supports buttons, sliders, wheels, capacitive proximity sensing, and touch screen applications.