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Product Detailed Parameters
- Description：IC MCU 8BIT 8KB FLASH 20QFN
- Series：C8051F9xx
- Mfr：Silicon Labs
- Package：Tube
- Core Processor：CIP-51 8051
- Core Size：8-Bit
- Speed：25MHz
- Connectivity：SMBus (2-Wire/I2C), SPI, UART/USART
- Peripherals：Brown-out Detect/Reset, Cap Sense, POR, PWM, WDT
- Number of I/O：16
- Program Memory Size：8KB (8K x 8)
- Program Memory Type：FLASH
- EEPROM Size：-
- RAM Size：512 x 8
- Voltage - Supply (Vcc/Vdd)：1.8V ~ 3.6V
- Data Converters：-
- Oscillator Type：Internal
- Operating Temperature：-40°C ~ 85°C (TA)
- Mounting Type：Surface Mount
- Supplier Device Package：20-QFN (3x3)
- Package / Case：20-UFQFN Exposed Pad
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Overview
The C8051F991-C-GM is an 8-bit microcontroller from the Silicon Labs C8051F9xx series, featuring a CIP-51 core. It integrates 8KB of flash memory and 512 bytes of RAM within a 20-pin QFN package. The device operates at a maximum clock frequency of 25MHz with a supply voltage range of 1.8V to 3.6V. Key peripherals include 13 channels of CapSense capability, SMBus, SPI, and UART/USART interfaces. It supports internal oscillators and includes standard MCU peripherals such as PWM, WDT, and power-on reset.
Feature Summary
- Integrates 13-channel CapSense functionality for touch sensing applications
- Supports multiple serial communication protocols including SMBus, SPI, and UART
- Features an internal oscillator for simplified system design
- Includes hardware peripherals such as PWM and watchdog timer
Applications
- Touch-sensitive user interface controllers
- Low-power embedded control systems
- Serial communication gateway devices
- Battery-operated portable electronics
Procurement Notes
Verify component authenticity through authorized distributors or direct manufacturer channels. Confirm the specific suffix '-C' corresponds to the required temperature grade and revision level. Check for end-of-life status or alternative part recommendations due to potential obsolescence in the C8051F9xx family. Ensure packaging details match project requirements for surface-mount assembly.
Selection Notes
Select this model when 8KB program memory and 512 bytes RAM are sufficient for application logic. Choose based on the requirement for integrated CapSense channels without external sensors. Consider the 20-pin QFN footprint for space-constrained designs. Verify that the 25MHz processing speed meets real-time control needs and that the 1.8V to 3.6V voltage range aligns with the system power supply.
Part Context
This component belongs to the Silicon Labs C8051F9xx series of 8-bit microcontrollers. The series is characterized by high integration and low power consumption. The C8051F991 variant specifically emphasizes capacitive sensing capabilities alongside standard 8051 compatibility. It shares architectural similarities with other members like the C8051F989 but differs in memory size and I/O configuration.
Replacement Considerations
Publicly confirmed substitute part numbers are not available in the provided documentation. Consult Silicon Labs for current alternatives within the C8051F9xx family or newer generations if this specific part is discontinued.
