## PIC18F2680-I/SP Technical Overview The **PIC18F2680-I/SP** is a high-performance, 8-bit Microcontroller (MCU) from Microchip Technology. It belongs to the PIC18F family and is widely known for its integrated **CAN (Controller Area Network)** module, making it ideal for automotive and industrial automation applications. --- ### 1. Key Technical Specifications The part number breaks down into specific technical attributes: | Feature | Specification | | :--- | :--- | | **Architecture** | 8-bit PIC | | **Program Memory (Flash)** | 64 KB | | **Data Memory (RAM)** | 3.25 KB | | **EEPROM** | 1024 Bytes | | **Operating Voltage** | 2.0V to 5.5V | | **Max CPU Speed** | 40 MHz (10 MIPS) | | **I/O Pins** | 25 | | **Package Type** | SPDIP-28 (Skinny Plastic Dual In-line Package) | --- ### 2. Core Electronic Components & Peripherals This microcontroller integrates several critical electronic modules onto a single chip: #### A. ECAN™ Technology The standout feature of the 18F2680 is the **Enhanced Controller Area Network (ECAN)** module. It supports CAN 2.0B Active, which allows the device to communicate in noisy environments like vehicles without data loss. #### B. Analog-to-Digital Converter (ADC) It features an 8-channel, **10-bit ADC**. This allows the microcontroller to read analog voltages from sensors (like temperature or pressure) and convert them into digital data. #### C. Communication Interfaces * **EUSART:** Supports RS-232, RS-485, and LIN serial communication. * **MSSP (Master Synchronous Serial Port):** Supports **I2C** and **SPI** protocols for connecting to external EEPROMs, displays, or sensors. #### D. Power Management (nanoWatt Technology) The chip includes power-saving modes (Sleep, Idle) and allows for clock switching to reduce current consumption during low-activity periods. --- ### 3. Understanding the Suffix (I/SP) The trailing characters in the part number define the physical and environmental constraints: * **-I:** **Industrial Temperature Range** (-40°C to +85°C). * **/SP:** **SPDIP Package** (Skinny Plastic Dual In-line Package). This is the 28-pin "breadboard-friendly" package with 0.300-inch width. --- ### 4. Basic Pinout Structure While the 28 pins serve multiple functions, they are generally grouped as follows: ```text +---U---+ MCLR -| 1 28 |- RB7 (ICSPDAT) RA0 -| 2 27 |- RB6 (ICSPCLK) RA1 -| 3 26 |- RB5 RA2 -| 4 25 |- RB4 RA3 -| 5 24 |- RB3 (CANRX) RA4 -| 6 23 |- RB2 (CANTX) RA5 -| 7 22 |- RB1 VSS -| 8 21 |- RB0 OSC1-| 9 20 |- VDD OSC2-| 10 19 |- VSS RC0 -| 11 18 |- RC7 RC1 -| 12 17 |- RC6 RC2 -| 13 16 |- RC5 RC3 -| 14 15 |- RC4 +-------+ ```