Silicon Labs C8051F206R

Overview

C8051F206R from Silicon Laboratories is a 12-bit SAR ADC-equipped 8051-compatible mixed-signal MCU with 8 kB ISP Flash, 1024-byte XRAM, and on-chip JTAG debug. It operates at up to 25 MHz (25 MIPS), supports 2.7–3.6 V supply, and integrates UART, SPI, three 16-bit timers, two comparators, and brown-out detection - used in industrial sensor nodes requiring precision analog acquisition and low-power embedded control.

For engineers reviewing the C8051F206R datasheet, C8051F206R pinout, C8051F206R application, or C8051F206R equivalent, key selection criteria include its 12-bit 100 ksps ADC performance, 48-pin TQFP package with 32 I/Os, JTAG-based in-system debug capability, and support for multiple sleep modes in harsh-temperature environments (–40°C to +85°C).

Technical Context

The C8051F206R implements a pipelined CIP-51 8051 core delivering 25 MIPS at 25 MHz, with 22 interrupt sources and expanded SFR addressing. Its analog subsystem centers on a true 12-bit SAR ADC with ±2 LSB INL, 32-channel AMUX, and programmable window detection - directly accessible via dedicated SFRs including ADC0H/ADC0L and AMX0SL.

Digital peripherals include hardware UART and SPI controllers, three independent 16-bit counter/timers (T0/T1/T2) with capture/auto-reload modes, and dual voltage comparators with 16-level hysteresis programmability - all configurable via dedicated SFRs such as SCON, SPI0CN, and CPT0CN/CPT1CN.

Key Specifications

Pinout & Package

Package: 48-pin TQFP (7 mm × 7 mm, 0.5 mm pitch), RoHS-compliant, moisture-sensitive level 3.

Key Features

Applications

Equivalent & Alternatives

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

Compared with C8051F206R, the C8051F226 offers identical packaging and software compatibility but trades 12-bit ADC accuracy for lower cost, while the EFM8BB52F16G delivers architectural upgrades at the expense of migration effort - making C8051F206R optimal for legacy-compatible, precision analog–digital convergence in space-constrained industrial modules.

Availability

C8051F206R is available at Aetrix Electronics and suitable for industrial sensor nodes, portable data loggers, motor control interfaces, and smart actuator modules requiring stable component supply across extended product lifecycles.

Supply support for C8051F206R 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 applications.

The C8051F2xx family was designed to deliver fully integrated, low-power 8051-based MCUs with precision analog front-ends for cost-sensitive industrial and instrumentation systems.

FAQ

What is the maximum ADC sampling rate supported by the C8051F206R?

The C8051F206R supports a maximum ADC sampling rate of 100 ksps (kilo-samples per second) in its highest-speed mode. This throughput is achievable with the 12-bit SAR ADC when configured for single-ended conversion and optimized clock settings. The actual sustained rate depends on system clock frequency, ADC configuration register (ADC0CF) settings, and whether window comparison or burst mode is enabled - all documented in Section 6 of the C8051F2xx datasheet. C8051F206R achieves this performance without external sample-and-hold circuitry.

Does the C8051F206R support in-system programming (ISP) of its Flash memory?

Yes, the C8051F206R supports full in-system programming of its 8 kB Flash memory via the on-chip JTAG interface. Programming can be performed without removing the device from the target board, using standard JTAG commands and Silicon Labs' provided tools (e.g., Simplicity Studio). Flash sectors are organized in 512-byte blocks, enabling selective reprogramming for firmware updates or parameter storage. C8051F206R also supports security lock bits to prevent unauthorized readback or modification.

What power-saving modes are available on the C8051F206R, and what is the typical current draw in each?

The C8051F206R offers Idle Mode (CPU halted, peripherals active) and Stop Mode (all clocks stopped, RAM retained). In Stop Mode, typical current draw is less than 1 μA at 3.3 V and 25°C. Idle Mode draws approximately 10 mA at 25 MHz operation, scaling linearly with frequency. Both modes retain register and RAM contents, and wake-up is supported via external interrupt, comparator event, or missing-clock detector. C8051F206R's low-power behavior is validated across the full –40°C to +85°C range.

Can the C8051F206R operate with an external crystal oscillator, and what is the maximum supported frequency?

Yes, the C8051F206R supports external crystal oscillators connected between XTAL1 and XTAL2 pins. The maximum rated crystal frequency is 25 MHz, aligning with its peak 25 MIPS performance. The oscillator circuit includes internal load capacitors and supports both fundamental-mode crystals and external RC networks. Frequency stability and startup time depend on crystal specifications and PCB layout; C8051F206R's OSCXCN register allows fine-tuning of drive strength and startup delay.

How many I/O pins does the C8051F206R have, and are they 5 V tolerant?

The C8051F206R in its 48-pin TQFP package provides 32 general-purpose I/O pins across Ports 0–3, all of which are 5 V tolerant regardless of supply voltage (2.7–3.6 V). Each pin can be individually configured as digital input/output, open-drain, or analog input (for ADC or comparator use). Pin functionality is remappable via SFRs like PRT0MX and PRT1MX, enabling flexible PCB routing. C8051F206R maintains 5 V tolerance even during reset or power-down sequences.