This document introduces a MCU product named C8051F921, which is a single/dual battery, 0.9-3.6V, 32kB, smaRTClock, 10-bit ADC. The product has various features and characteristics, including wide supply voltage range, built-in DC-DC converter, low power consumption, fast wakeup, etc.
The C8051F921 is a low‑voltage, low‑power 8051‑core microcontroller with a built‑in 10‑bit ADC, smart clock, and dual‑battery operation (0.9‑3.6 V). It offers up to 300 ksps ADC throughput, two comparators, capacitive touch inputs, and extensive digital peripherals including UART, SPI, SMBus, and programmable timers.
The device is supplied in a 24‑pin QFN package (4 × 4 mm) and includes 32 kB flash, 4352 bytes of internal RAM, and a precision internal oscillator up to 25 MHz. Detailed electrical specifications such as supply current, sleep mode current, and clock source options are listed in the handbook.
| Supply Voltage | 0.9 to 3.6 V |
|---|---|
| ADC Resolution | 10 bits |
| ADC Throughput Rate | 300 ksps |
| Flash Memory | 32 kB |
| Internal RAM | 4352 bytes |
| Package | 24‑pin QFN (4 × 4 mm) |
| Clock Frequency Range | up to 25 MHz |
| Sleep Mode Current | < 0.1 µA |
It supports 0.9 V to 3.6 V, with one‑cell mode operating from 0.9 V to 1.8 V and two‑cell mode from 1.8 V to 3.6 V.
The ADC provides 10‑bit resolution with a maximum throughput of 300 ksps.
The microcontroller includes 32 kB of flash memory.
It is offered in a 24‑pin QFN package measuring 4 × 4 mm.