C8051F712-GM

Overview

The Silicon Labs C8051F712-GM is a mixed-signal ISP Flash microcontroller featuring a high-speed 8051 core with up to 25 MIPS throughput at a 25 MHz clock. It integrates 16 kB of in-system programmable Flash, 512 bytes of internal data RAM, and 32 bytes of data EEPROM. The device includes a 10-bit ADC supporting up to 500 ksps, a capacitance-to-digital converter for touch sensing, an analog comparator, and a built-in temperature sensor. Communication interfaces include UART, SMBus, and SPI. It operates on a supply voltage of 1.8 V to 3.6 V within a temperature range of –40 °C to +85 °C.

Feature Summary

• Integrates a capacitance-to-digital converter supporting up to 38 input channels for buttons, sliders, wheels, and touch screen sensing.
• Features a pipelined instruction architecture that executes 70% of instructions in one or two system clocks for efficient processing.
• Provides on-chip debug circuitry facilitating full speed, non-intrusive in-system debug without requiring external emulators.

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

Procurement Notes

Verify the specific package variant, as the C8051F71x family supports multiple form factors including QFN-24, QFN-32, TQFP-48, and TQFP-64. Confirm the suffix matches the required pin count and thermal characteristics. Note that this component family is marked as not recommended for new designs; evaluate long-term availability and lifecycle status before finalizing procurement plans.

Selection Notes

Select this component when a highly integrated solution combining digital control with analog peripherals is required. The inclusion of both a standard ADC and a dedicated capacitance-to-digital converter allows for versatile sensor interfacing. Ensure the design accommodates the 1.8 V to 3.6 V operating range and utilizes the available communication protocols such as SMBus or SPI for system connectivity.

Part Context

The C8051F712-GM belongs to the C8051F70x/71x mixed-signal ISP Flash MCU family from Silicon Labs. This series is characterized by its fully integrated mixed-signal capabilities, combining a high-performance 8051 CPU with extensive analog and digital peripherals on a single chip. The family targets cost-sensitive embedded applications requiring robust control and sensing features.

Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation. As the C8051F70x/71x family is explicitly marked as not recommended for new designs, alternative modern microcontrollers should be evaluated for future projects.

FAQ

What is the maximum sampling rate of the integrated ADC?

The integrated 10-bit Analog to Digital Converter (ADC) supports a maximum sampling rate of up to 500 ksps.

How does the capacitance-to-digital converter function?

The capacitance-to-digital converter supports up to 38 input channels and provides output resolutions of 12, 13, 14, or 16 bits with a fast conversion time of 40 µs per channel, suitable for touch sensing applications.