C8051F34B-GMR

Overview

The C8051F34B-GMR is a mixed-signal System-on-Chip microcontroller from the C8051F34x family, manufactured by Silicon Labs. It features a high-speed pipelined 8051-compatible core operating at up to 48 MIPS with a maximum clock frequency of 48 MHz. The device integrates 64 kB of in-system programmable Flash memory and 4352 bytes of RAM. Key peripherals include a full-speed USB 2.0 function controller with an integrated transceiver and on-chip clock recovery, a 10-bit ADC supporting up to 200 ksps, two comparators, and an internal voltage reference. Digital interfaces comprise enhanced SPI, SMBus, and dual UARTs. The unit operates within a supply voltage range of 2.7 V to 5.25 V and supports industrial temperatures from -40 °C to +85 °C.

Feature Summary

• Integrates a full-speed USB 2.0 function controller with an on-chip transceiver and clock recovery, eliminating the need for external crystals or resistors.
• Features a high-performance pipelined 8051 core capable of executing instructions in one or two system clocks for efficient processing.
• Includes a 10-bit analog-to-digital converter with built-in multiplexer, temperature sensor, and programmable window detector capabilities.
• Provides flexible digital I/O configuration through a priority crossbar decoder and supports non-intrusive in-system debugging via the C2 interface.

Applications

• PC peripherals and point-of-sale terminals requiring embedded USB connectivity
• Data acquisition systems utilizing onboard analog sensors and ADC
• Industrial control devices operating in harsh environmental conditions

Procurement Notes

Verify that the specific suffix GMR corresponds to the tape-and-reel packaging variant when sourcing components. Confirm the revision level matches current design requirements, as this series is marked Not Recommended for New Designs. Ensure compatibility with existing firmware architectures given the legacy status of the C8051F34x family.

Selection Notes

Select this component for applications demanding a fully integrated USB solution without external passive components. The 48 MHz core speed suits moderate processing loads, while the extensive analog suite supports sensor interfacing. Consider the 32-pin LQFP package availability for board layout constraints and verify power supply stability across the 2.7 V to 5.25 V operating range.

Part Context

This part belongs to the C8051F34x Full Speed Flash MCU family, which provides single-chip solutions for embedded USB applications. The family combines a fast 8051 CPU with rich peripheral sets including USB controllers, ADCs, and digital communication interfaces. Designed for high integration, these MCUs reduce bill-of-materials costs by consolidating multiple discrete functions onto one die.

Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation. As the C8051F34x series is designated Not Recommended for New Designs, consult Silicon Labs for current generation alternatives such as the EFM8 or C8051F0xx series.

FAQ

Does the C8051F34B require an external crystal for USB operation?

No, the device features an integrated clock recovery circuit that allows full-speed or low-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 200 ksps.