Silicon Labs C8051F712-GQR

Overview

C8051F712-GQR from Silicon Laboratories is a mixed-signal ISP Flash MCU integrating a 10-bit 500 ksps ADC, capacitive sensing interface (up to 38 channels), hardware UART/SMBus/SPI, and a high-speed 8051 core delivering 25 MIPS at 25 MHz. It operates from 1.8–3.6 V, supports auto-scan wake-on-touch, and targets embedded human-interface systems such as touch-enabled industrial HMI panels.

For engineers reviewing the C8051F712-GQR datasheet, C8051F712-GQR pinout, C8051F712-GQR application, or C8051F712-GQR equivalent, key selection criteria include its 64-pin TQFP package, integrated CS0 capacitance-to-digital converter with 40 µs/channel conversion, 16 kB flash with in-system programmability, and support for real-time clock mode using external crystal.

Technical Context

The C8051F712-GQR implements a pipelined CIP-51 8051-compatible core with on-chip debug circuitry enabling full-speed non-intrusive in-system debugging. Its analog subsystem includes a 10-bit ADC with programmable reference sources (VREF, VDD, or internal), built-in temperature sensor, and a dedicated Capacitive Sense (CS0) peripheral supporting auto-accumulate of 4–64 samples per channel.

Digital peripherals include four 16-bit timers, a 16-bit programmable counter array (PCA) with three capture/compare modules, hardware-enhanced UART, SMBus (I²C-compatible), and enhanced SPI. Clock flexibility is provided by a 24.5 MHz ±2% internal oscillator, external crystal/RC/C inputs, and dynamic on-the-fly clock source switching for power management.

Key Specifications

Pinout & Package

Package: 64-pin Thin Quad Flat Package (TQFP), 10 mm × 10 mm body, 0.5 mm lead pitch, exposed thermal pad (GND-connected). Compliant with JEDEC MO-220, RoHS and lead-free reflow profiles.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar mixed-signal microcontroller applications.

Compared with C8051F712-GQR, C8051F711-GQR omits capacitive sensing and reduces memory resources, limiting it to simpler control tasks; EFM8BB52F16G-QFP64 offers modern peripherals and higher performance but shifts capacitive sensing burden to software - increasing validation effort and real-time jitter risk.

Availability

C8051F712-GQR is available at Aetrix Electronics and suitable for industrial HMI panels, smart appliance interfaces, medical keypad systems, and building automation thermostats requiring stable component supply and long-term manufacturability assurance.

Supply support for C8051F712-GQR includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Silicon Laboratories is a fabless semiconductor company specializing in mixed-signal ICs for timing, IoT, and embedded control, with design centers in Austin, Munich, and Taipei.

The C8051F70x/71x family was engineered for cost-sensitive, low-power human-interface applications requiring integrated capacitive sensing, analog measurement, and robust in-system debug - targeting industrial and consumer edge devices.

FAQ

What is the maximum number of capacitive sense channels supported by the C8051F712-GQR?

The C8051F712-GQR supports up to 38 capacitive sense input channels via its dedicated CS0 peripheral. This is confirmed in the Rev. 1.0 datasheet Section 15, where CS0 multiplexer routing and port pin configuration tables explicitly list P0.0–P0.7, P1.0–P1.7, P2.0–P2.7, P3.0–P3.7, P4.0–P4.7, and P6.0–P6.5 as valid CS0 inputs - totaling 38 pins. Each channel achieves 40 µs conversion time with selectable 12–16-bit resolution.

Does the C8051F712-GQR include an internal voltage reference for the ADC?

Yes, the C8051F712-GQR includes an internal voltage reference that can be selected as the ADC0 reference source. Per Section 12.2 of the Rev. 1.0 datasheet, the internal VREF is factory-trimmed to 1.65 V ±3% and is routed to the ADC via the AMUX0 control logic. It may be used alongside external VREF or VDD, and supports both left-justified and right-justified output formats.

What debug interface does the C8051F712-GQR use, and how many pins are required?

The C8051F712-GQR uses the proprietary 2-wire C2 debug interface, requiring only C2CK and C2D pins. As documented in Section 35, this interface supports full-speed in-system programming and non-intrusive debugging - including breakpoints, register inspection, and memory read/write - without requiring an external emulator or additional pins beyond those two. The C2 interface replaces traditional JTAG for this family.

Is the C8051F712-GQR pin-compatible with other devices in the C8051F70x/71x family?

The C8051F712-GQR is pin-compatible with other 64-pin TQFP variants in the C8051F70x/71x family, including C8051F700-GQR, C8051F702-GQR, and C8051F710-GQR, as confirmed by Figure 3.1 (C8051F7xx-GQ TQFP64 Pinout Diagram) and Table 2 (Ordering Information) in the Rev. 1.0 datasheet. All share identical pin functions and electrical characteristics in the 64-pin TQFP package.

What power-saving modes are available on the C8051F712-GQR, and which peripherals remain active in Stop Mode?

The C8051F712-GQR supports Idle, Stop, and Suspend power modes. In Stop Mode (Section 24.2), the system clock is halted, but the internal POR circuit, VDD monitor, and external interrupt pins remain active - enabling wake-up via pin change, comparator reset, or missing clock detector. The CS0 peripheral is disabled in Stop Mode, but wake-on-touch must be configured in Idle Mode with auto-scan enabled.