STM8S903K3 and STM8S903F3 are 16 MHz STM8S 8-bit MCUs with 8 Kbytes Flash, 1 Kbyte RAM, 640 bytes EEPROM, 10-bit ADC, 2 timers, UART, SPI, I²C, and other features.
This document is a datasheet for the STM8S903K3 and STM8S903F3 8-bit microcontrollers (MCUs). These devices are based on the 16 MHz advanced STM8 core with Harvard architecture and a 3-stage pipeline. Key features include 8 Kbytes of Flash program memory, 1 Kbyte of RAM, and 640 bytes of true EEPROM data memory. The MCUs support a wide operating voltage range of 2.95 to 5.5 V and offer flexible clock control with four master clock sources, including low power crystal resonator, external clock input, and internal RC oscillators.
| Core Frequency | 16 MHz |
|---|---|
| Program Memory | 8 Kbytes Flash |
| Data Memory | 1 Kbytes RAM |
| EEPROM Memory | 640 bytes |
| Operating Voltage | 2.95 to 5.5 V |
| ADC Resolution | 10-bit |
| Timers | 2 timers |
| Flash Retention | 20 years at 55 °C |
| EEPROM Endurance | 300 kcycles |
The operating voltage range is 2.95 to 5.5 V.
There are 8 Kbytes of Flash program memory available.
Available packages include UFQFPN32, LQFP32, SDIP32, TSSOP20, SO20W, UFQFPN20, and LQFP20.