8-bit CISC microcontroller featuring an 8051 core, 8KB Flash program memory, and 512B RAM. This surface-mount device offers a 25 MHz maximum clock rate and 16 programmable I/Os. Integrated peripherals include I2C, SPI, and UART interfaces, along with 9 ADC channels. The 20-pin QFN EP package with an exposed pad measures 3x3x0.53mm, suitable for automotive applications with an operating voltage range of 2.4V to 3.6V and an operating temperature of -40°C to 85°C.
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| Basic Package Type | Non-Lead-Frame SMT |
| Package Family Name | QFN |
| Package/Case | QFN EP |
| Package Description | Quad Flat No Lead Package, Exposed Pad |
| Lead Shape | No Lead |
| Pin Count | 20 |
| PCB | 20 |
| Package Length (mm) | 3 |
| Package Width (mm) | 3 |
| Package Height (mm) | 0.53 |
| Seated Plane Height (mm) | 0.55 |
| Pin Pitch (mm) | 0.5 |
| Package Material | Plastic |
| Mounting | Surface Mount |
| Family Name | C8051F99x |
| Data Bus Width | 8bit |
| Instruction Set Architecture | CISC |
| Maximum Clock Rate | 25MHz |
| Maximum CPU Frequency | 25MHz |
| Device Core | 8051 |
| Program Memory Type | Flash |
| Program Memory Size | 8KB |
| RAM Size | 512B |
| Number of Programmable I/Os | 16 |
| Core Architecture | 8051 |
| Programmability | Yes |
| Number of Timers | 4 |
| Interface Type | I2C/SMBus/SPI/UART |
| CAN | 0 |
| I2C | 1 |
| SPI | 1 |
| Ethernet | 0 |
| UART | 1 |
| USART | 0 |
| USB | 0 |
| I2S | 0 |
| Max Operating Supply Voltage | 3.6V |
| Min Operating Temperature | -40°C |
| Max Operating Temperature | 85°C |
| ADC Channels | 9 |
| Number of ADCs | Single |
| Cage Code | 6SQ24 |
| EU RoHS | Yes |
| HTS Code | 8542390001 |
| Schedule B | 8542390000 |
| ECCN | EAR99 |
| Automotive | Yes |
| RoHS Versions | 2011/65/EU, 2015/863 |
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