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| Part Number | C8051F921-GM | C8051F931-GM | C8051F981-GM | C8051F921-GMR | C8051F901-GM | C8051F911-GM | C8051F920-GM |
|---|---|---|---|---|---|---|---|
| Manufacturer | Silicon Labs | Silicon Labs | Silicon Labs | Silicon Labs | Silicon Labs | Silicon Labs | Silicon Labs |
| Product Status | Obsolete | Obsolete | Obsolete | Obsolete | Obsolete | Obsolete | Obsolete |
| Core Processor | 8051 | 8051 | CIP-51 8051 | 8051 | 8051 | 8051 | 8051 |
| Core Size | 8-Bit | 8-Bit | 8-Bit | 8-Bit | 8-Bit | 8-Bit | 8-Bit |
| Speed | 25MHz | 25MHz | 25MHz | 25MHz | 25MHz | 25MHz | 25MHz |
| Connectivity | SMBus (2-Wire/I²C), SPI, UART/USART | SMBus (2-Wire/I²C), SPI, UART/USART | SMBus (2-Wire/I²C), SPI, UART/USART | SMBus (2-Wire/I²C), SPI, UART/USART | SMBus (2-Wire/I²C), SPI, UART/USART | SMBus (2-Wire/I²C), SPI, UART/USART | SMBus (2-Wire/I²C), SPI, UART/USART |
| Peripherals | Brown-out Detect/Reset, POR, PWM, Temp Sensor, WDT | Brown-out Detect/Reset, POR, PWM, Temp Sensor, WDT | Brown-out Detect/Reset, POR, PWM, WDT | Brown-out Detect/Reset, POR, PWM, Temp Sensor, WDT | Brown-out Detect/Reset, POR, PWM, Temp Sensor, WDT | Brown-out Detect/Reset, POR, PWM, Temp Sensor, WDT | Brown-out Detect/Reset, POR, PWM, Temp Sensor, WDT |
| Number of I/O | 16 | 16 | 16 | 16 | 16 | 16 | 24 |
| Program Memory Size | 32KB (32K x 8) | 64KB (64K x 8) | 8KB (8K x 8) | 32KB (32K x 8) | 8KB (8K x 8) | 16KB (16K x 8) | 32KB (32K x 8) |
| Program Memory Type | Flash | Flash | Flash | Flash | Flash | Flash | Flash |
| EEPROM Size | - | - | - | - | - | - | - |
| RAM Size | 4.25K x 8 | 4.25K x 8 | 512 x 8 | 4.25K x 8 | 768 x 8 | 768 x 8 | 4.25K x 8 |
| Voltage - Supply (Vcc/Vdd) | 0.9V ~ 3.6V | 0.9V ~ 3.6V | 1.8V ~ 3.6V | 0.9V ~ 3.6V | 0.9V ~ 3.6V | 0.9V ~ 3.6V | 0.9V ~ 3.6V |
| Data Converters | A/D 15x10b | A/D 15x10b | - | A/D 15x10b | A/D 15x10b | A/D 15x10b | A/D 23x10b |
| Oscillator Type | Internal | Internal | Internal | Internal | Internal | Internal | Internal |
| Operating Temperature | -40°C ~ 85°C (TA) | -40°C ~ 85°C (TA) | -40°C ~ 85°C (TA) | -40°C ~ 85°C (TA) | -40°C ~ 85°C (TA) | -40°C ~ 85°C (TA) | -40°C ~ 85°C (TA) |
| Mounting Type | Surface Mount | Surface Mount | Surface Mount | Surface Mount | Surface Mount | Surface Mount | Surface Mount |
| Package / Case | 24-WFQFN Exposed Pad | 24-WFQFN Exposed Pad | 20-UFQFN Exposed Pad | 24-WFQFN Exposed Pad | 24-WFQFN Exposed Pad | 24-WFQFN Exposed Pad | 32-VFQFN Exposed Pad |
| Supplier Device Package | 24-QFN (4x4) | 24-QFN (4x4) | 20-QFN (3x3) | 24-QFN (4x4) | 24-QFN (4x4) | 24-QFN (4x4) | 32-QFN (5x5) |
