C8051F311

Overview

The C8051F311 is an 8-bit microcontroller from the Silicon Labs C8051F31x family, featuring a high-speed CIP-51 core with up to 25 MIPS throughput at 25 MHz. It integrates 16 kB of in-system programmable Flash memory and 1280 bytes of internal data RAM. The device includes two hardware-enhanced serial ports (UART and SMBus), SPI, four general-purpose timers, and a 16-bit Programmable Counter Array. Digital I/O pins are 5 V tolerant.

Feature Summary

• High-performance pipelined 8051 architecture executing most instructions in one or two system clocks
• Integrated on-chip debug circuitry enabling full-speed non-intrusive in-system debugging without external emulators
• Programmable digital crossbar allows flexible assignment of peripheral functions to GPIO pins
• Low-power operation with configurable clock sources and multiple power management modes

Applications

• Industrial control systems requiring robust 8051 compatibility
• Embedded sensor interfaces utilizing UART and SMBus communication
• Battery-powered devices leveraging low-current stop mode operation
• General-purpose logic control using PCA capture/compare modules

Procurement Notes

Verify the specific package type, as the C8051F311 utilizes a 28-pin QFN footprint distinct from other variants in the series. Confirm that the target application does not require the 12-bit ADC found only in C8051F310/1/2/3/6 models, as this component lacks that peripheral. Ensure development tools support the C2 interface for programming and debugging.

Selection Notes

Select this model when 16 kB of Flash is required but the 12-bit ADC present in the C8051F310 is unnecessary. The 28-pin QFN package offers a smaller form factor compared to the 32-pin LQFP used by the C8051F310. This variant maintains identical CPU performance and digital peripherals while omitting specific analog conversion capabilities to reduce pin count and complexity.

Part Context

The C8051F311 belongs to the C8051F31x mixed-signal MCU family produced by Silicon Labs. It shares the same core architecture and memory size as the C8051F310 but differs in package configuration and peripheral availability. The family is designed for applications needing high integration, fast execution speeds, and comprehensive on-chip resources within a compact footprint.

Replacement Considerations

C8051F310-GQR

FAQ

Does the C8051F311 include a 12-bit Analog-to-Digital Converter?

No, the 12-bit ADC is only available on the C8051F310, C8051F312, C8051F313, and C8051F316 models within the F31x family.

What package type is used for the C8051F311?

The C8051F311 is housed in a 28-pin QFN package.

Can the C8051F311 be programmed in-circuit?

Yes, it supports in-system programming via its integrated C2 debug interface, allowing Flash updates without removing the chip from the board.