C8051F931-G-GMR

Overview

The C8051F931-G-GMR 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 64 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. Key peripherals include a 10-bit SAR ADC with 23 external inputs, two comparators, and a hardware SmaRTClock real-time clock. Communication interfaces consist of SMBus, dual SPI, and UART modules.

Feature Summary

• Integrated on-chip debug circuitry enabling full-speed, non-intrusive in-system debugging without external emulators
• Built-in DC-DC converter supporting low-voltage single-cell battery operation down to 0.9 V
• Hardware SmaRTClock oscillator providing real-time clock functionality with ultra-low power consumption
• High-speed pipelined CIP-51 architecture executing 70% of instructions in one or two system clocks

Applications

• Single-cell battery-powered embedded systems requiring extended operational life
• Dual-battery applications utilizing the wide 0.9 V to 3.6 V supply range
• Industrial control devices necessitating precise analog signal acquisition via the 10-bit ADC
• Real-time monitoring systems leveraging the integrated temperature sensor and SmaRTClock

Procurement Notes

Verify that the specific ordering suffix matches the required package type and temperature grade. Confirm RoHS compliance status against current regulatory requirements. Ensure the component revision aligns with design specifications, noting that this family is marked as not recommended for new designs. Cross-reference the manufacturer datasheet for any recent product change notices affecting assembly or sourcing.

Selection Notes

Select this component when a robust 8-bit MCU with extensive analog capabilities is required. The inclusion of a 10-bit ADC with auto-averaging and programmable gain makes it suitable for precision measurement tasks. Consider the available I/O count and serial interface options to ensure compatibility with system connectivity needs. Evaluate the power management features, particularly the DC-DC converter, if operating from a single lithium cell.

Part Context

This part belongs to the C8051F9xx family of mixed-signal microcontrollers. It shares architectural similarities with the C8051F930 but offers increased Flash capacity. The series is characterized by its fully static operation and comprehensive peripheral set, including multiple timers and capture/compare modules. It represents a mature solution for cost-sensitive applications requiring deterministic performance.

Replacement Considerations

Public confirmed substitute part numbers: C8051F930-G-GMR.