The Microchip PIC12C672-04E/SM is an 8-bit PIC microcontroller from the PIC® 12C series, clocked at 4 MHz with 3.5 KB (2K x 14) of one-time-programmable (OTP) program memory and 128 x 8 bytes of RAM. It integrates a 4-channel 8-bit ADC, power-on reset (POR), and a watchdog timer (WDT). This part is suited for cost-sensitive, high-volume embedded control applications where firmware is finalized before production — typical uses include appliance controllers, sensor interfaces, and simple industrial actuators that never need field updates.
The program memory is OTP (one-time programmable), meaning the firmware is burned once during manufacturing and cannot be erased or rewritten. This locks the application code for the life of the device, which eliminates any risk of firmware corruption in the field but also rules out bug fixes, feature upgrades, or calibration tweaks after shipment. For designs where the code is mature and volume justifies a one-time mask, OTP cuts the per-unit cost versus Flash-based MCUs. The 3.5 KB capacity (2K x 14 words) is enough for small control loops, state machines, and simple communication protocols.
On-chip peripherals reduce BOM
The PIC12C672-04E/SM includes a 4-channel 8-bit ADC, POR, and WDT, which eliminates the need for external reset supervisors, watchdog ICs, or a separate ADC converter for simple analog inputs like temperature, pressure, or level sensing. The internal oscillator further saves a crystal or ceramic resonator, though the 4 MHz speed is fixed — no PLL or frequency scaling. With only 5 general-purpose I/O pins, this MCU is best suited for designs requiring a handful of digital inputs and outputs plus one or two analog channels.
If you are looking for a Flash-based alternative for prototyping or field-upgradeable designs, the PIC16LF1559-I/SS (8-bit, 32 MHz, Flash, 17 I/O) is a functional step-up, but it is not pin-compatible and uses a different package (SSOP).