C8051F342-GQ

Overview

The C8051F342-GQ is a mixed-signal System-on-Chip microcontroller from the C8051F34x family, manufactured by Silicon Labs. It features a high-speed 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 USB 2.0 function controller with an integrated transceiver and clock recovery, a 10-bit ADC supporting up to 200 ksps, two comparators, four general-purpose timers, and multiple digital communication interfaces such as SPI, SMBus, and UART. It operates within a voltage range of 2.7 V to 5.25 V and supports industrial temperature ranges.

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 70% of instructions in one or two system clocks.
• Includes a 10-bit analog-to-digital converter with built-in multiplexer, internal voltage reference, and temperature sensor.
• Provides flexible peripheral pin mapping through a programmable digital crossbar and supports non-intrusive in-system debugging via the C2 interface.

Applications

• PC peripherals requiring USB connectivity
• Point-of-sale (POS) terminals
• Embedded modems
• Voice over Internet Protocol (VoIP) telephones

Procurement Notes

Verify the specific package type and suffix against the official datasheet before ordering, as the C8051F34x family utilizes various packages including TQFP, LQFP, and QFN. Confirm that the selected variant meets the required memory and peripheral configuration for the target application. Check for any obsolescence notices or recommended replacement parts, as this series may be marked as not recommended for new designs.

Selection Notes

Select the C8051F342-GQ when a compact 32-pin package is required alongside full USB functionality and significant onboard memory. Ensure the design accommodates the 2.7 V to 5.25 V supply range, utilizing the internal regulator if voltages exceed 3.6 V. Verify that the 48 MHz core speed and available I/O pins meet the processing and connectivity demands of the embedded system.

Part Context

The C8051F342-GQ belongs to the C8051F34x series of full-speed USB flash MCUs. This family is designed as a single-chip solution for embedded USB applications, combining a fast 8051 processor with extensive analog and digital peripherals. The GQ suffix typically denotes a specific package variant, such as the 32-pin LQFP or QFN, distinguishing it from other pin counts in the same silicon family.

Replacement Considerations

Consult the official Silicon Labs documentation for direct substitutes within the C8051F34x family, such as the C8051F340 or C8051F346, depending on package and peripheral needs. Verify pin compatibility and memory sizes before swapping components.

FAQ

Does the C8051F342-GQ require an external crystal for USB operation?

No, the device includes 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 ADC on this MCU?

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