C8051F920-F-GQR

Overview

The C8051F920-F-GQR is an 8-bit microcontroller from the Silicon Labs C8051F9xx series, featuring a high-speed CIP-51 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) or a two-cell mode (1.8–3.6 V). Key peripherals include a 10-bit SAR ADC with up to 23 external inputs, two comparators, and a SmaRTClock real-time clock. Communication interfaces consist of hardware SMBus, dual SPI ports, and a UART. The component is housed in a 32-pin LQFP package.

Feature Summary

• Integrated on-chip debug circuitry enables full-speed, non-intrusive in-system debugging without requiring external emulators.
• Built-in DC-DC converter allows efficient low-voltage operation down to 0.9 V while maintaining higher analog supply voltages via an LDO regulator.
• Hardware SmaRTClock oscillator operates independently down to 0.9 V with ultra-low power consumption for real-time clock functions.
• Port I/O pins are 5 V tolerant with programmable drive strength and high sink current capabilities.

Applications

• Single-cell battery-powered embedded systems
• Dual-cell battery monitoring applications
• Low-power sensor interface nodes
• Industrial control systems requiring 5 V tolerant I/O

Procurement Notes

Verify the specific suffix 'F' against the manufacturer's latest documentation to confirm package type and temperature grade specifications. Confirm that the 32 kB Flash variant matches the design requirements, as the F93x counterpart offers 64 kB. Ensure the 32-pin LQFP footprint aligns with the PCB layout constraints before finalizing procurement.

Selection Notes

Select this component when a fully static 8051 architecture is required alongside precise analog acquisition capabilities. The integrated DC-DC converter makes it suitable for single-cell lithium applications where efficiency is critical. Consider the 23-channel ADC multiplexer if extensive signal conditioning is needed without external components.

Part Context

This part belongs to the C8051F9xx family of mixed-signal microcontrollers designed for low-voltage, low-power applications. It shares the same core architecture and peripheral set as the C8051F93x series, differing primarily in program memory capacity. The F920 variant provides 32 kB of Flash, distinguishing it from the larger memory options available in the broader product line.

Replacement Considerations

C8051F930-G-GQR: Offers identical functionality but with 64 kB of Flash memory instead of 32 kB. Verify software compatibility and memory mapping adjustments if upgrading to the higher capacity variant.