C8051F921-G-GMR

Overview

The C8051F921-G-GMR is a mixed-signal 8-bit microcontroller from the C8051F92x series, featuring a high-speed 8051 core operating at up to 25 MHz. It integrates 32 kB of in-system programmable Flash memory and 4352 bytes of internal data RAM. The device supports a supply voltage range of 0.9 V to 3.6 V, utilizing a built-in DC-DC converter for one-cell mode operation (0.9–1.8 V) and an LDO regulator for two-cell mode (1.8–3.6 V). Key peripherals include a 10-bit SAR ADC with 300 ksps throughput, two comparators, and multiple digital interfaces including SMBus, SPI, and UART.

Feature Summary

• Integrated DC-DC converter enables full functionality down to 0.9 V for single-battery applications
• High-speed pipelined 8051 core delivers up to 25 MIPS throughput
• On-chip debug circuitry allows non-intrusive in-system debugging without external emulators
• Flexible clocking system includes precision internal oscillators and SmaRTClock for low-power timing

Applications

• Battery-powered portable medical equipment
• Industrial sensor nodes requiring ultra-low sleep current
• Smart metering and utility monitoring systems
• Wearable devices with strict power constraints

Procurement Notes

Verify the specific suffix 'G' against the manufacturer's latest documentation to confirm package type and temperature grade. Confirm RoHS compliance status as per the most recent datasheet revision. Check for any product change notices regarding assembly or material updates before finalizing procurement plans.

Selection Notes

Select this component when designing systems that require operation from a single lithium cell while maintaining full peripheral functionality. The integrated DC-DC converter is critical for extending battery life compared to standard LDO-only designs. Ensure the application benefits from the high analog integration and on-chip debug capabilities to reduce board space and development time.

Part Context

This part belongs to the C8051F9xx family of ultra-low power MCUs. It shares architectural similarities with the C8051F93x series but offers reduced Flash capacity (32 kB vs 64 kB). The family is characterized by its ability to operate across wide voltage ranges and its focus on minimizing current consumption in both active and sleep modes.

Replacement Considerations

Public confirmed substitute part numbers are not available in the provided source material.