C8051F931-GM 8051 8-bit Microcontroller

The C8051F931-GM is an ultra-low power microcontroller that has been designed from the ground up to be highly power-effective. The MCU features a powerful 8051 core with 25 MHz performance along with 64 kB Flash, 4.25 kB RAM  and a 10-bit, 15-ch., 300 ksps ADC in a 4x4 mm, QFN24. The C8051F931-GM also operates down to 0.9 V and up to 3.6 V to enable single-cell battery operation as well as dramatically increasing the battery life for dual-cell applications. With an integrated dc-dc converter and low energy modes to reduce the active and sleep currents, the C8051F931-GM is ideal for applications such as portable medical products, consumer electronics, industrial monitoring and control, wireless meter reading, portable audio, remote controls and other low-power applications.

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Specifications Summary

MCU Core: 8051

MHz: 25

Flash (kB): 64

RAM (kB): 4.25


I²C: 1

SPI: 2


Dig I/O Pins: 16

ADC: 10-bit, 15-ch., 300 ksps


Comparators: 2

PCA Channels: 6

Timers: 4

Package Type: QFN24

Package Size (mm): 4x4

Development Tools Type
C8051F930DK C8051 MCU Development Kit Development Kits
Title Version Resource Type
EZLink Firmware (F930/Si443x) 1.4r/b Software
uVision Driver 4.30 Software
Configuration Wizard 2 Installer 4.40 Software
Production Programmer 3.90 Software
IDE Installer 5.30 Software
FLASHUtil Installer 4.78 Software
ToolStick Development Tools 2.60.1 Software
KeilC51 Install 9.55 Software
RD-0039-0201 - ZigBee Capsense Dimmer Reference Design with EM3587, EFM8SB1 and PCB Antenna 2.1 Reference Designs
USB Debug Adapter Reset Utility 1.7 Software
ToolStick University DC Development Tools Software
Simplicity Studio Production Programmer 1.0 Software
Simplicity Studio v3, Mac Installer v3 Software
Simplicity Studio v3, Linux Installer v3 Software
Simplicity Studio v3 v3 Software
Simplicity Studio v4, Mac Installer v4.1.8 Software
Simplicity Studio v4, Linux Installer v4.1.8 Software
Simplicity Studio v4 (Windows) v4.1.8 Software
Simplicity Studio v4 (Windows64) v4.1.8 Software
C8051F930-DK User Guide 0.7 User Guides
ToolStick C8051F931 Daughter Card User Guide 0.2 User Guides
PCN #1311071: C8051F92x-F93x Revision G Product Change Notifications (PCN)
MCU Fab(TSMC) & Assy(ASECL)Site Expansion Std Product Change Notifications (PCN)
MCU DFN/QFN/TQFN/TQFP Pkg Test Site Expand-ASECL Grp1of2 Std Product Change Notifications (PCN)
1205091_C8051F92x_F93x_Revision_F_Transition_std Product Change Notifications (PCN)
RF Wireless Foundation Course Book One 0.1 Miscellaneous
C8051F93x/92x Errata History 0.1 Errata
C8051F93x-92x Rev G Errata 0.2 Errata
C8051F931 CAD/CAE Schematic Footprints and Symbols 1.0 Schematic and Layout Files
Low Power Design Basics: How to Choose the Optimal Low Power MCU for Your Embedded System White Paper White Papers
Chip Scale Packages Wearables Technology White Papers
AN1121: Headless Builds with Simplicity Studio v4 0.1 Application Notes
AN1160: Project Collaboration with Simplicity Studio 0.1 Application Notes
AN0822: Simplicity Studio™ User's Guide 0.5 Application Notes
C8051F93x and C8051F92x Tested Single and Dual Battery 0.9-3.6 V 64 kB Flash SmaRTClock 10-Bit ADC MCU 1.4 Data Sheets
Toolstick Programming Adapter User Guide 0.3 User Guides
ToolStick Base Adapter User Guide 0.1 User Guides
8 Bit Tools package, Release Notes 4.90 Software
PB #1604121: C8051F93x 92x Errata Rev0.2 Addendum Product Change Notifications (PCN)
PB #1603081: C8051F93x 92x Errata Rev0.2 Product Change Notifications (PCN)
Optimizing Low Power Operation of the 'F9xx Software
AN358: Optimizing Low Power Operation of the ‘F9xx 0.4 Application Notes
AN431: C8051F93x-90x Software Porting Guide 0.1 Application Notes
AN140: Integrating HI-TECH 8051 Tools into the IDE 1.3 Application Notes
AN778: UART Bootloader 0.2 Application Notes
AN359: Debugging Techniques for the C8051F9xx and Si10xx Device Families 0.4 Application Notes
AN767: SMBus Bootloader 0.1 Application Notes
AN103: Using the On-Chip Temperature Sensor 1.3 Application Notes
AN324: Advanced Encryption Standard 0.1 Application Notes
AN910: Layout Design Practices Around the Output of an On-chip DC-DC Converter 0.1 Application Notes
AN101: Configuring the Port I/O Crossbar Decoder 2.2 Application Notes
AN798: EEPROM Emulation with Wear-Leveling for 8-Bit Flash MCUs 0.1 Application Notes
AN778 Software 0.2 Example Code
AN767SW: SMBus Bootloader Software Example Code
The C8051 Core: A Viable Compute Engine for 8-bit MCU Design 1.0 White Papers
Using Low-Cost OTP Microcontrollers to Simplify Embedded Applications White Papers
The Heartbeat behind Portable Medical Devices: Ultra-Low-Power Mixed-Signal Microcontrollers 0.1 White Papers
How to Pick the Right Microcontroller Based on Low-Power Specifications 1.0 White Papers
Selecting the Optimal Battery for your Embedded Application 1.1 White Papers
Die Wahl der optimalen Batterie für Ihr Embedded-System 1.0 White Papers
QSG150: C8051Fxxx Development Kit Quick-Start Guide 0.6 Quick Start Guides
C8051Fxxx Dev Kit Quick Start Guide for Kits Featuring the USB Debug Adapter 0.5 Quick Start Guides
AN114: Hand Soldering Tutorial for Fine Pitch QFP Devices 1.1 Application Notes
AN119: Calculating Settling Time for Switched Capacitor ADCs 1.3 Application Notes
AN124: Pin Sharing Techniques for the C2 Interface 1.4 Application Notes
8-Bit USB Debug Adapter User's Guide 0.3 User Guides
ToolStick Debug Adapter User Guide 0.1 User Guides
ToolStick Daughter Card Template Software
AN136: Silicon Labs Production Programming Options 1.6 Application Notes
Standard Outerbox Label Change to Include RoHS and Halogen Free Mark Product Change Notifications (PCN)
Si10xx Quick-Start Guide 0.2 Quick Start Guides
Si10xx Quick-Start Guide 0.1 Quick Start Guides
uVision Driver Rev History 4.30 Release Notes
ToolStick Dev Tools Release Notes 2.60.1 Release Notes
VCP Driver v6.7.3 Release Notes v6.7.3 Release Notes
IR Performance Analysis Tool Release Notes 1.11 Release Notes
USBXpress v6.7.3 Release Notes 6.7.3 Release Notes
Hex to Svf Release Notes 1.31 Release Notes
8051 Instruction Set Presentations
WMBUS Setup Software
AN111: Using the 8-Bit MCUs in 5 Volt Systems 1.4 Application Notes
AN1096: Simplicity Studio v4 Offline Installation 0.1 Application Notes
AN533: Modular Bootloader Framework for Silicon Labs C8051Fxxx Microcontrollers 0.1 Application Notes
AN203: 8-Bit MCU Printed Circuit Board Design Notes 0.3 Application Notes
AN236: Integrating IAR 8051 Tools into the Silicon Laboratories IDE 0.3 Application Notes
AN198: Integrating SDCC 8051 Tools into the Silicon Labs IDE 0.2 Application Notes
MCUniversity Course Lectures - Chinese 1 Miscellaneous
IEC-60730 Certificate Miscellaneous
MCUniversity Course Lectures 1 Miscellaneous
AN249: Human Interface Device Tutorial Example Code
AN141: SMBus Communication for Small Form Factor Devices Example Code
AN127: Flash Programming via the C2 Interface Example Code
Embedded programming Textbook 1 White Papers
CIP-51 Performance for Standard Library Math Routines 2.1 White Papers
Accuracy Considerations for Microcontroller-Based Temperature Sensors 1.0 White Papers
How to Overcome Technical Hurdles During Microcontroller Development 1.0 White Papers
AN1121SW.zip 0.1 Example Code
PB #1606031: Inner Box Label Change Product Change Notifications (PCN)
QuickSense Front Panel STB Software
Simplicity Studio v3, Offline Installer v3 Software
Integrating Hi-Tech 8051 tools into the Silicon Labs IDE Example Code
Integrating Tasking 8051 tools into the Silicon Labs IDE Example Code
AN101: Configuring the Port I/O Crossbar Decoder Example Code
Improving ADC resolution by oversampling and averaging Example Code
Interfacing an External SRAM to the C8051Fxxx Example Code
Configuring the internal and external oscillators Example Code
16-bit PWM using an on-chip timer Example Code
Implementing a real-time clock Example Code
Software UART examples Example Code
AN798: EEPROM Emulation with Wear-Leveling for 8-Bit Flash MCUs 0.1 Example Code
Integrating IAR 8051 tools into the Silicon Labs IDE Example Code
Integrating SDCC 8051 tools into the Silicon Labs IDE Example Code
Modular bootloader framework for Silicon Labs MCUs Example Code
Low Pin-Count LCD Interface Software Example Code
Writing to flash from firmware Example Code
Three-Channel Power Sequencer. Example Code
Advanced encryption standard Example Code
EFM8 BRD5204A Reference Design Schematic Schematic and Layout Files
EFM8 BRD5204A Reference Design Bill of Materials Schematic and Layout Files
Production Programmer Release Notes 3.90 Release Notes
AN568: EEPROM Emulation for Flash Microcontrollers 0.1 Application Notes
AN568: EEPROM Emulation for Flash Microcontrollers Example Code
Hex to Svf conversion utility software V 1.31 Software
Keil C51 Release Notes Release Notes
Simplicity Commander -- Windows 1.5.0 Software
Simplicity Commander -- Mac 1.5.0 Software
Simplicity Commander Release Notes 1.5.0 Software
Simplicity Commander -- Linux 1.5.0 Software
AN0823: Configuring Peripherals for 8-Bit Devices in Simplicity Studio 0.4 Application Notes
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