C8051F705-GMR

Overview

The C8051F705-GMR is an 8-bit mixed-signal ISP Flash MCU from the C8051F70x/71x family. It features a high-speed pipelined 8051 core operating at up to 25 MHz with 25 MIPS throughput. The device includes 16 kB of in-system programmable Flash memory, 512 bytes of internal data RAM, and 32 bytes of data EEPROM. Key peripherals include a 10-bit ADC supporting up to 500 ksps, a capacitance-to-digital converter for touch sensing, analog comparators, and multiple digital interfaces such as UART, SMBus, and SPI.

Feature Summary

• Integrated capacitance-to-digital converter supports buttons, sliders, wheels, proximity, and touch screen sensing with auto-scan capabilities.
• On-chip debug circuitry enables full-speed, non-intrusive in-system debugging without requiring external emulation hardware.
• High-speed 8051 microcontroller core utilizes a pipelined architecture to execute 70% of instructions in one or two system clocks.
• Flexible clock sources include a precision internal oscillator and support for external crystals, RC, or capacitor configurations.

Applications

• Capacitive touch sensing applications including buttons, sliders, and proximity detection
• Mixed-signal control systems requiring integrated analog-to-digital conversion
• Battery-powered devices utilizing low-voltage operation and power management modes
• Industrial monitoring systems using on-chip temperature sensors and voltage comparators

Procurement Notes

Verify component authenticity through authorized Silicon Labs distributors. Confirm package type matches the required PCB footprint. Check RoHS compliance status against current regulatory requirements. Ensure development tools are compatible with the C2 interface for programming and debugging. Review datasheet revision history for any electrical characteristic updates.

Selection Notes

Select this model when 16 kB of program memory and 512 bytes of RAM are sufficient for the application. Consider the QFN-48 package for compact designs requiring capacitance sensing features. Evaluate pin availability for required digital peripherals like UART and SPI. Verify that the 1.8 V to 3.6 V supply range aligns with the system power architecture.

Part Context

This component belongs to the C8051F70x/71x family of mixed-signal MCUs. These devices integrate high-performance 8051 cores with extensive analog and digital peripherals on a single chip. The family emphasizes ease of development through on-chip debugging and in-system programming capabilities, targeting cost-sensitive embedded applications.

Replacement Considerations

Consult official Silicon Labs documentation for confirmed substitute part numbers within the C8051F70x/71x series. Verify pin compatibility and peripheral configuration before substitution. Note that this specific model is marked as Not Recommended for New Designs; evaluate newer alternatives if starting a fresh design project.

FAQ

What is the maximum sampling rate of the integrated ADC?

The 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 that supports buttons, sliders, wheels, and touch screen sensing with up to 38 input channels.

How is the device programmed and debugged?

It features on-chip debug circuitry for full-speed, non-intrusive in-system debugging via the C2 interface, and allows in-system programming of Flash memory in 512-byte sectors.