The Microchip PIC16LC67-04/L: An 8-Bit CMOS Microcontroller with OTP Memory

In the realm of embedded control, the demand for reliable, cost-effective, and dedicated microcontrollers remains consistently high. The Microchip PIC16LC67-04/L stands as a classic and robust solution within this space, embodying the core principles of the venerable PIC16C6x family. This 8-bit CMOS microcontroller is engineered for applications requiring a high degree of integration and dependable performance in a low-power package, with its One-Time Programmable (OTP) EPROM memory being a key defining characteristic.

Fabricated with low-power, high-speed CMOS technology, the PIC16LC67-04/L is designed for efficiency. The "LC" designation specifically indicates its low-voltage operation capability, making it suitable for battery-powered and portable applications where power consumption is a critical design parameter. Operating at a clock speed of 4 MHz (as denoted by the -04 suffix) and across a wide voltage range, it provides a solid balance between processing throughput and energy savings.

The core architecture of this microcontroller is based on Microchip's proven RISC (Reduced Instruction Set Computing) CPU. This design philosophy results in a mere 35 single-word instructions that are easy to learn and implement, while also enabling a two-stage instruction pipeline for efficient execution. Most instructions complete in a single cycle, achieving a throughput of up to 1 MIPS per MHz.

A significant feature of the PIC16LC67-04/L is its 8K x 14 words of OTP EPROM program memory. OTP memory is a type of non-volatile memory that can be programmed once by the user or manufacturer. This is ideal for high-volume production runs where the firmware is fully debugged and finalized, as it offers a lower cost alternative to UV-erasable or flash-based MCUs. It provides the permanence of a masked ROM but with the flexibility of being programmable in-house, protecting code from accidental erasure or modification in the field.

Beyond its core, the device is packed with integrated peripherals that minimize external component count and reduce total system cost. It features 368 bytes of RAM, an 8-bit timer, a 16-bit timer/counter, a watchdog timer for enhanced reliability, and a 5-channel 8-bit Analog-to-Digital Converter (ADC). This rich set of features allows it to interface directly with sensors, analog signals, and digital components, making it a versatile choice for a wide array of control applications, from industrial and automotive subsystems to consumer electronics.

ICGOODFIND: The Microchip PIC16LC67-04/L represents a focused and economical solution for embedded designers. Its combination of a low-power CMOS core, efficient RISC architecture, and the cost-effectiveness of OTP memory makes it a compelling choice for finalized, high-volume designs. While lacking the re-programmability of flash-based parts, its integration and reliability solidify its role as a dedicated workhorse in the world of 8-bit microcontrollers.

Keywords: OTP Memory, Low-Power CMOS, 8-Bit Microcontroller, RISC Architecture, High-Volume Production.