8-bit microcontroller with 4KB FLASH memory and 0.5KB RAM. Features an 8051 core architecture operating at up to 25MHz. Includes 17 programmable I/Os, 10 ADC channels, and multiple communication interfaces (I2C, SPI, UART, USART, SMBus). Offers 4 timers/counters, PWM, watchdog timer, and brown-out detect. Operates from 1.8V to 3.6V supply voltage and is housed in a 4mm x 4mm QFN package.
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| Package/Case | QFN |
| Core Architecture | 8051 |
| Data Bus Width | 8b |
| Frequency | 25MHz |
| Height | 0.8mm |
| Interface | I2C, SPI, UART, USART, SMBus, 2-Wire |
| Length | 4mm |
| Max Frequency | 25MHz |
| Max Operating Temperature | 85°C |
| Min Operating Temperature | -40°C |
| Max Supply Voltage | 3.6V |
| Memory Size | 4KB |
| Memory Type | FLASH, |
| Min Supply Voltage | 1.8V |
| Number of ADC Channels | 10 |
| Number of I/Os | 17 |
| Number of Programmable I/O | 17 |
| Number of SPI Channels | 1 |
| Number of Timers/Counters | 4 |
| Number of UART Channels | 1 |
| Operating Supply Voltage | 2.4V |
| Oscillator Type | Internal |
| Packaging | Rail/Tube |
| Peripherals | Brown-out Detect/Reset, POR, PWM, WDT, Temp Sensor |
| Radiation Hardening | No |
| RAM Size | 0.5KB |
| RoHS Compliant | No |
| Series | C8051F9xx |
| Watchdog Timer | Yes |
| Width | 4mm |
| RoHS | Not CompliantNo |
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