C8051T621-GM

Overview

The C8051T621-GM is a Full Speed USB EPROM MCU from Silicon Labs, operating within a supply voltage range of 1.8 to 5.25 V. It features a high-speed 8051 core delivering up to 48 MIPS throughput at a 48 MHz clock. The device integrates a USB function controller compliant with USB specification 2.0, supporting full speed (12 Mbps) and low speed (1.5 Mbps) operation with an integrated transceiver and clock recovery. Memory resources include up to 3328 bytes of internal data RAM and 64 kB of byte-programmable EPROM code memory. Digital peripherals comprise 25 port I/O pins, hardware-enhanced SPI, SMBus, two UARTs, four 16-bit counter/timers, and a 16-bit programmable counter array. Clock sources include two internal oscillators and support for external crystals or RC circuits.

Feature Summary

• Integrated USB function controller with built-in transceiver and clock recovery, eliminating the need for external components.
• High-performance pipelined 8051 microcontroller core capable of executing most instructions in one or two system clocks.
• On-chip debug circuitry enabling non-intrusive in-system debugging with breakpoints and single-stepping capabilities.
• Flexible memory architecture allowing EPROM programming directly from firmware running on the device.

Applications

• USB-enabled embedded control systems
• In-system code development platforms using C8051F34A
• Low-power applications utilizing internal oscillators and power management modes

Procurement Notes

Verify component authenticity through authorized distributors. Confirm package type matches design requirements, as options include QFN28, QFN32, and LQFP32. Check revision status, as this family is marked Not Recommended for New Designs. Ensure environmental ratings meet application needs, specifically the –40 to +85 °C operating temperature range. Validate pin compatibility if replacing existing designs.

Selection Notes

Select this part when USB connectivity is required without external transceivers. Consider the 64 kB EPROM size for firmware storage needs. Evaluate the 10-Bit ADC availability, noting it is present in T620/6/7 variants but absent in T621. Assess power consumption against the 1.8–5.25 V supply range. Compare peripheral counts, such as the number of comparators and timers, against specific interface requirements.

Part Context

This component belongs to the C8051T620/1/6/7 & C8051T320/1/2/3 family of Full Speed USB EPROM MCUs. It shares architectural similarities with other members like the C8051T620 and C8051T626, differing primarily in specific peripheral configurations such as ADC presence. The family utilizes the CIP-51 core and supports various package formats including QFN and LQFP.

Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation. As the family is marked Not Recommended for New Designs, consult Silicon Labs for current alternative recommendations.

FAQ

Does the C8051T621 include a 10-Bit ADC?

No, the 10-Bit ADC is only available in the C8051T620, C8051T626, C8051T627, C8051T320, and C8051T321 derivatives.

What clock sources are supported by the C8051T621?

It supports two internal oscillators (48 MHz and low-frequency options), external crystals, RC circuits, capacitors, or CMOS clocks.