C8051T321-GMR

Overview

The C8051T321-GMR is an 8-bit microcontroller from Silicon Labs, part of the C8051T32x family. It features a high-speed CIP-51 core operating at up to 48 MHz with 48 MIPS throughput. The device integrates 64 kB of byte-programmable EPROM and up to 3328 bytes of internal data RAM. Key peripherals include a full-speed USB 2.0 function controller with integrated transceiver and clock recovery, two enhanced UARTs, SPI, SMBus, four 16-bit timers, and a PCA with PWM functionality. It operates on a supply voltage of 1.8 V to 5.25 V and supports 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 components.
• Features a pipelined CIP-51 microcontroller core that executes most instructions in one or two system clocks for high performance.
• Includes non-intrusive on-chip debug circuitry supporting breakpoints, single stepping, and memory inspection without interrupting operation.

Applications

• USB-enabled embedded systems requiring direct connectivity
• Industrial control applications utilizing serial communication interfaces
• Data acquisition systems leveraging analog-to-digital conversion capabilities

Procurement Notes

Verify component authenticity through authorized distributors or Silicon Labs directly. Confirm package type matches design requirements, as options include QFN-28, QFN-32, and LQFP-32. Check for end-of-life status, as this family may be marked not recommended for new designs. Ensure ESD handling protocols are followed during assembly due to moisture sensitivity classification.

Selection Notes

Select this model when EPROM storage is required for firmware updates via firmware running on the device itself. Choose over Flash variants if specific in-application programming constraints favor EPROM technology. Verify pin count compatibility with the target PCB layout, considering the available QFN and LQFP packages. Ensure the 1.8 V to 5.25 V supply range aligns with the system power architecture.

Part Context

This component belongs to the C8051T32x series of mixed-signal microcontrollers. It shares architectural similarities with the C8051F3xx and C8051T6xx families but distinguishes itself through the use of EPROM instead of Flash memory. The T32x series is designed for cost-sensitive applications requiring robust USB connectivity and standard 8051 compatibility.

Replacement Considerations

C8051T320-GM: Identical specifications with different packaging suffix.

FAQ

Can the EPROM memory be programmed while the device is operating in the system?

Yes, the C8051T321-GMR supports in-application programming (IAP) of its EPROM memory using firmware running on the device.

Does the USB controller require an external crystal oscillator?

No, the device includes an integrated clock recovery mechanism and internal oscillators, removing the need for an external crystal for USB operation.