C8051F351R

Overview

The C8051F351R is an analog-intensive mixed-signal microcontroller featuring a high-speed 8051 core with up to 50 MIPS throughput. It integrates 8 kB of in-system programmable Flash memory and 768 bytes of on-chip RAM. The device includes a 24-bit, 8-channel sigma-delta ADC with a programmable gain amplifier supporting conversion rates up to 1 ksps. Additional peripherals include two 8-bit current-output DACs, a voltage comparator, four 16-bit timers, and a programmable counter array. Operating within a supply voltage range of 2.7 V to 3.6 V, it supports digital I/O across 17 pins.

Feature Summary

• Integrates a 24-bit sigma-delta ADC subsystem with an eight-input multiplexer and programmable gain amplifier for high-resolution signal acquisition.
• Features a pipelined 8051 instruction set architecture capable of executing seventy percent of instructions in one or two system clocks.
• Includes on-chip debug circuitry enabling full-speed, non-intrusive in-system debugging without external emulation hardware.
• Provides flexible clock sources including a precision internal oscillator with a clock multiplier to achieve maximum operating frequencies.

Applications

• Portable medical equipment
• Weigh scales
• Test equipment
• Fiber optic systems

Procurement Notes

Verify the specific suffix 'R' against the manufacturer's official documentation to confirm tape-and-reel packaging status. Ensure the selected variant matches the required package type, as the family supports both MLP-28 and LQFP-32 configurations. Cross-reference the revision level with the latest datasheet to confirm peripheral availability and electrical characteristics remain unchanged.

Selection Notes

Select this component when high-resolution analog input processing is required alongside standard digital control functions. The integrated 24-bit ADC eliminates the need for external converters in precision measurement applications. Consider the low power consumption modes if battery operation is a constraint. Verify that the 17 available digital I/O pins meet the interface requirements for the target application.

Part Context

This device belongs to the C8051F35x series of mixed-signal microcontrollers from Silicon Labs. The series shares a common architectural foundation but varies in ADC resolution and peripheral configuration. The C8051F351 specifically targets applications requiring high-precision analog-to-digital conversion capabilities within a compact footprint.

Replacement Considerations

C8051F350-GM

FAQ

What is the maximum sampling rate of the ADC?

The ADC supports programmable conversion rates up to 1 ksps.

Does the device support in-circuit reprogramming?

Yes, the 8 kB Flash memory can be reprogrammed in-circuit in 512-byte sectors.