C8051F321-GMR

Overview

The C8051F321-GMR is an 8-bit microcontroller from Silicon Labs, part of the C8051F32x family. It features a high-speed 8051 core operating at up to 25 MIPS with a 25 MHz clock. The device integrates 16 kB of in-system programmable Flash memory and 2304 bytes of internal RAM. Key peripherals include a full-speed USB 2.0 function controller with integrated transceiver and clock recovery, a 10-bit ADC supporting up to 200 ksps, two comparators, and multiple digital interfaces such as UART, SPI, and SMBus. It operates within a temperature range of –40 to +85 °C and is housed in a 28-pin QFN package.

Feature Summary

• Integrates a full-speed USB 2.0 function controller with an on-chip transceiver and clock recovery, eliminating the need for external components.
• Features a high-speed pipelined 8051 microcontroller core capable of executing instructions in one or two system clocks.
• Includes a 10-bit analog-to-digital converter with up to 200 ksps sampling rate and built-in temperature sensor.
• Provides non-intrusive on-chip debug circuitry for in-system debugging without requiring external emulator hardware.

Applications

• Embedded USB connectivity solutions
• Data acquisition systems
• Industrial control applications

Procurement Notes

Verify component authenticity through authorized distributors. Confirm RoHS compliance status and check for 'Not Recommended for New Designs' markings in current documentation. Ensure ESD handling protocols are followed during storage and assembly. Validate package type matches project requirements.

Selection Notes

Select this MCU for designs requiring integrated USB functionality without external PHYs. Consider the 16 kB Flash limit and 2304 byte RAM capacity for application complexity. Evaluate the 28-pin QFN package constraints against PCB layout capabilities. Review interrupt latency and timer resources for real-time processing needs.

Part Context

This component belongs to the C8051F32x series of mixed-signal microcontrollers. It shares architectural similarities with the C8051F320 but differs in package configuration. The family emphasizes single-chip integration for USB applications, combining digital and analog peripherals to reduce bill-of-materials count.

Replacement Considerations

Consult official Silicon Labs documentation for qualified substitute part numbers. Verify pin compatibility and peripheral equivalence before substitution.

FAQ

Does the C8051F321 require an external crystal for USB operation?

No, the device features an integrated clock recovery mechanism that allows full-speed USB operation without an external crystal.

What is the maximum sampling rate of the onboard ADC?

The 10-bit ADC supports a maximum sampling rate of up to 200 ksps.