C8051T323-GM

Overview

The C8051T323-GM is a full-speed USB EPROM microcontroller from Silicon Labs, featuring an 8051 core with up to 48 MIPS throughput at 48 MHz. It includes 64 kB byte-programmable EPROM and up to 3328 bytes of internal data RAM. The device integrates a USB 2.0 function controller with an integrated transceiver and clock recovery, supporting eight flexible endpoints and 1 kB of USB buffer memory. Digital peripherals include two enhanced UARTs, hardware-enhanced SPI, SMBus, four general-purpose 16-bit timers, and a 16-bit PCA with five capture/compare modules. Analog features consist of two comparators with programmable hysteresis and a built-in temperature sensor. Operating voltage ranges from 1.8 V to 5.25 V, with an on-chip LDO for the internal core supply.

Feature Summary

• Integrates a high-speed pipelined 8051 core capable of executing most instructions in one or two system clocks.
• Includes a USB 2.0 compliant function controller with integrated transceiver and clock recovery, eliminating external components.
• Features byte-programmable EPROM code memory that can be programmed via firmware running on the device.
• Provides flexible digital I/O configuration through a priority crossbar decoder and supports non-intrusive in-system debug.

Applications

• USB-enabled embedded applications requiring host or device connectivity
• Industrial control systems utilizing serial communication interfaces
• Portable instruments and sensors leveraging onboard analog monitoring

Procurement Notes

Verify component authenticity by checking manufacturer markings against official datasheet specifications. Confirm package type matches QFN-32 or LQFP-32 requirements. Ensure operating conditions align with the specified -40°C to +85°C temperature range. Validate supply voltage compatibility within the 1.8 V to 5.25 V operational window before integration into final designs.

Selection Notes

Select this MCU when EPROM reprogrammability is required for field updates or production flexibility. Choose this part if a fully integrated USB solution without external resistors or crystals is necessary. Consider this device for applications needing multiple serial interfaces and precise timing control via the PCA module. Verify pin count and package dimensions fit the target PCB layout constraints.

Part Context

This component belongs to the C8051T32x family of mixed-signal microcontrollers designed for USB connectivity. It shares architectural similarities with the C8051T62x series but differs in specific peripheral configurations such as ADC availability. The family utilizes the CIP-51 instruction set architecture for enhanced performance over standard 8051 cores while maintaining software compatibility.

Replacement Considerations

Silicon Labs indicates this product line is not recommended for new designs. Review current documentation for potential end-of-life status or obsolescence notices. Evaluate successor families like the EFM8 series for modern alternatives with updated feature sets and longer support lifecycles.

FAQ

Does the C8051T323 require an external oscillator for USB operation?

No, the device features integrated clock recovery that allows full-speed or low-speed USB operation without an external oscillator.

Can the program memory be modified after manufacturing?

Yes, the device contains byte-programmable EPROM that can be programmed from firmware running on the device itself.

What is the maximum instruction execution speed?

The high-speed 8051 core achieves up to 48 MIPS throughput when operating at a 48 MHz clock frequency.