C8051F236R

Overview

The C8051F236R is an 8-bit mixed-signal System on a Chip microcontroller from Silicon Labs, part of the C8051F2xx family. It features a high-speed CIP-51 core operating at up to 25 MHz with pipelined architecture for 25 MIPS throughput. The device integrates 8 kB of in-system programmable Flash memory and 1.25 kB of SRAM (256 bytes internal plus 1024 bytes XRAM). Key peripherals include hardware UART and SPI interfaces, three general-purpose 16-bit timers, a dedicated watchdog timer, and two analog comparators. It operates within a supply voltage range of 2.7 V to 3.6 V and supports temperatures from -40°C to +85°C.

Feature Summary

• Fully integrated mixed-signal SoC with on-chip JTAG debug circuitry enabling full-speed, non-intrusive in-system debugging without external emulators.
• Hardware-implemented UART and SPI serial interfaces allow for efficient communication protocols without software bit-banging overhead.
• In-circuit reprogrammable Flash memory supports field upgrades and acts as non-volatile data storage.
• Comprehensive analog peripherals include dual comparators with configurable hysteresis and a VDD monitor/brown-out detector.

Applications

• Industrial control systems requiring robust I/O and analog monitoring
• Sensor interface circuits utilizing onboard comparators and ADC capabilities
• Embedded applications needing hardware serial communication via UART or SPI

Procurement Notes

Verify component authenticity through authorized distributors or direct manufacturer channels. Confirm RoHS compliance status as indicated in official documentation, noting that specific listings may indicate non-compliance. Check for End-of-Life (EOL) announcements and Last Time Buy (LTB) notifications prior to procurement decisions. Ensure package markings match the datasheet specifications for the 48-TQFP variant.

Selection Notes

Select this model when a fully integrated 8-bit MCU with hardware serial interfaces and analog comparators is required. It is suitable for designs needing in-circuit programmability and on-chip debugging. Consider the 48-TQFP package constraints and verify power supply stability within the 2.7 V to 3.6 V range. Evaluate if the 25 MHz performance meets system timing requirements compared to higher-speed alternatives.

Part Context

The C8051F236R belongs to the C8051F2xx series of mixed-signal microcontrollers. This family shares a common CIP-51 core and peripheral set but varies in ADC resolution and RAM size. The 'F236 specifically lacks an onboard SAR ADC but includes the extended SRAM configuration found in other models like the 'F206 and 'F226. It is designed for cost-sensitive applications requiring high integration.

Replacement Considerations

Check for EFM8BB52F16I-QFN20 as a recommended replacement for related automotive/industrial needs, though pinouts and features differ significantly. Verify code compatibility and peripheral mapping before migrating to newer Silicon Labs 8-bit families.