C8051F920-GMR

Overview

The C8051F920-GMR is an 8-bit microcontroller from the Silicon Labs C8051F9xx series, featuring a 25 MHz high-speed 8051 core. It includes 32 kB of in-system programmable Flash memory and 4352 bytes of internal data RAM. The device operates on a supply voltage range of 0.9 V to 3.6 V, supporting single-cell (0.9–1.8 V) and dual-cell (1.8–3.6 V) battery applications via a built-in DC-DC converter. Key peripherals include a 10-bit ADC with up to 23 inputs, two comparators, SMBus, SPI, and UART interfaces, housed in a 32-pin QFN package.

Feature Summary

• Operates at low voltages down to 0.9 V using an integrated DC-DC converter for efficient power management.
• Features a 10-bit SAR ADC with burst mode and auto-averaging accumulator for precise analog measurements.
• Includes hardware SmaRTClock oscillator for real-time clock functions with minimal current consumption.
• Provides full-speed non-intrusive on-chip debug capabilities without requiring external emulators.

Applications

• Single or dual-cell battery-powered embedded systems
• Low-power industrial control and monitoring nodes
• Portable instrumentation requiring precise analog sensing
• Battery-operated IoT devices with real-time clock requirements

Procurement Notes

Verify the specific suffix 'GMR' corresponds to the tape-and-reel packaging variant when ordering. Confirm that the 32 kB Flash capacity matches the system requirements, as this distinguishes it from the 64 kB F93x variants. Ensure the design supports the 0.9 V to 3.6 V operating range and utilizes the internal DC-DC converter if operating below 1.8 V. Check for RoHS compliance status relevant to your region's regulations.

Selection Notes

Select this model over the F93x series if 32 kB of program memory is sufficient, as it offers a cost-effective solution for constrained storage applications. Consider the 32-pin QFN package for compact board layouts compared to larger LQFP options. Evaluate the need for the 10-bit ADC resolution versus simpler comparator-only devices if analog precision is not critical. Verify that the 24 I/O pins meet the interface requirements for sensors and communication buses.

Part Context

This component belongs to the C8051F9xx family of ultra-low-power 8-bit MCUs designed for battery-operated applications. The series is notable for its ability to run at 0.9 V, extending battery life significantly. The F920 variant specifically provides 32 kB of Flash, distinguishing it from the higher-capacity F930. It shares the same core architecture and peripheral set as other members of the F92x/F93x family.

Replacement Considerations

C8051F930-G-GMR: Offers identical functionality but with 64 kB Flash instead of 32 kB. Compatible pinout and software, suitable if additional code space is needed.

FAQ

How does the device support operation below 1.8 V?

The C8051F920-GMR includes a built-in DC-DC converter that boosts the input voltage to regulate the internal core, allowing stable operation in one-cell mode from 0.9 V to 1.8 V.

What is the maximum throughput of the ADC?

The 10-bit SAR ADC supports a programmable throughput of up to 300 ksps, enhanced by a 16-bit auto-averaging accumulator for improved resolution in burst mode.