PIC16F818-I/SO 8-Bit 20MHz Flash MCU | Microchip Technology
料号： PIC16F818-I/SO ✓ 量产中PIC16F818-I/SO 概述
A microcontroller is a programmable semiconductor that combines a processor core, program memory, data memory, and peripherals on one integrated circuit. The PIC16F818 belongs to the PIC16 family of 8-bit RISC microcontrollers and sits within the broader hierarchy of embedded controllers, microcontrollers, and semiconductor devices. Its compact feature set supports control, timing, communication, data acquisition, and low-power embedded applications without requiring an external memory device.
Key resources include 1.75 KB of flash program memory and 128 bytes of EEPROM data memory. The manufacturer lists an 8 MHz internal oscillator, while the device can operate at up to 20 MHz. Integrated peripherals include five 10-bit ADC channels, capture/compare/PWM functionality, and a synchronous serial port configurable for three-wire SPI or two-wire I²C communication. These resources allow designers to consolidate functions that otherwise require several discrete components.
The PIC16F818-I/SO uses a compact 8-bit RISC architecture optimized for straightforward embedded-control tasks. Its flash memory supports in-system reprogramming, while EEPROM provides nonvolatile storage for parameters and retained state. The ADC can measure analog inputs referenced to the device's supply and I/O structure, enabling sensor interfaces, threshold decisions, and process-control loops. Serial peripherals provide paths to displays, sensors, external memories, and other digital devices.
Typical applications include compact sensor nodes, thermostat and HVAC controllers, battery-operated instruments, simple motor-control boards, LED sequencing systems, and industrial measurement modules. The five ADC channels are especially useful for monitoring analog quantities, while PWM and capture/compare functions support timing, dimming, and input-event tasks. Configurable SPI or I²C operation helps conserve board area when connecting external peripherals.
Designers should verify the device's operating-voltage and temperature limits against the manufacturer datasheet before production release. Decoupling, programming access, oscillator configuration, and analog-input routing must follow the device's recommended application circuit. Because the exact pin assignments are not stated on the product landing page, use the pin-description table in the manufacturer datasheet when assigning PCB nets and connector positions.
This page combines the manufacturer's device overview with practical guidance on analog acquisition, serial connectivity, firmware implementation, and drop-in replacement evaluation. It also distinguishes verified electrical resources from parameters that require confirmation in the full datasheet, helping engineers plan a board correctly before committing to a layout or production build.
直接替换替代料： PIC16F818-I/SO ——相同封装，引脚兼容。需要 PCB 改动的不同封装料号已排除。
本系列中的变体
可与以下型号直接替换的同系列型号： PIC16F818-I/SO （相同外形与封装尺寸） ——差异在于 Package, Core Architecture, Timers, Operating Temperature, ADC.
PIC16F819-I/SO
✅ 直接替换联系询价
查看数据手册 →PIC16F818-I/SO 最大额定值与电气特性
| Microcontroller Type | 8-bit PIC RISC flash microcontroller |
| 最大时钟频率 | 20 MHz |
| Internal Oscillator Frequency | 8 MHz |
| Program Memory | 1.75 KB flash (1K x 14) |
| Data Memory | 128 bytes EEPROM |
| General-Purpose I/O Count | 16 pins |
| ADC Resolution | 10 bit |
| ADC Channel Count | 5 channels |
| Serial Interface | 3-wire SPI or 2-wire I²C |
| Timer/PWM Peripheral | Capture/Compare/PWM |
| 封装 | 18-pin SOIC |
| 安装类型 | Surface mount |
| Instruction Architecture | 8-bit RISC |
| Maximum Supply Current | 4.0 mA |
PIC16F818-I/SO 18-pin soic 引脚配置指南
PIC16F818-I/SO（18-pin soic 封装）的引脚配置。 该数字 IC 包含 GPIO、通信接口（UART、SPI、I2C）和电源引脚。请参阅制造商数据手册以了解复用引脚功能和配置选项。对嵌入式系统设计和 PCB 布局至关重要。
暂无详细引脚数据： PIC16F818-I/SO.
请参阅 数据手册 以查看完整引脚配置。
典型应用
PIC16F818-I/SO 适用于 6 应用s: Compact Sensor Node, Thermostat and HVAC Control, LED Sequencing and Lighting Controller, Simple Motor and Actuator Control, Battery-Powered Data Logger, Industrial Measurement Module.
Compact Sensor Node
The PIC16F818-I/SO fits compact sensor nodes that need local analog measurements, digital control, and periodic serial reporting. Its five 10-bit ADC channels can monitor several sensor outputs, while 16 I/O pins support switches, indicators, and actuator commands. The 8 MHz internal oscillator allows the design to avoid an external clock in applications that do not require the 20 MHz maximum clock rate. Configure SPI or I²C for a sensor, radio, or external memory, and use EEPROM to retain calibration or configuration data. Because the 1.75 KB flash capacity limits firmware size, keep the application focused and confirm the complete pin assignment in the manufacturer datasheet before finalizing the board.
Thermostat and HVAC Control
A PIC16F818-I/SO-based thermostat can use its five 10-bit ADC channels to evaluate temperature-setpoint inputs, while the capture/compare/PWM peripheral supports timing functions associated with relay or valve control. The 128-byte EEPROM can retain setpoints, calibration values, or operating counters across power cycles. Its 16 I/O pins are useful for a display, pushbuttons, status LEDs, and a controlled output stage. The internal 8 MHz oscillator reduces external oscillator requirements for moderate control-loop workloads. Validate ADC accuracy, output switching isolation, and thermal effects in the final enclosure, especially when the controller operates next to relays, heaters, or power-conversion circuitry.
LED Sequencing and Lighting Controller
PIC16F818-I/SO can implement compact LED-sequencing, display, and decorative-lighting controllers using its timers, 16 I/O pins, and capture/compare/PWM capability. PWM channels are useful for brightness control, while multiple outputs can drive status indicators or multiplexed indicator arrangements without a separate LED driver IC. The 1.75 KB flash memory is sufficient for small finite-state animation tables and timing routines, and EEPROM can retain user-selected patterns. Keep the MCU rails and signal returns separated from high-current LED paths to prevent switching transients from disturbing control logic. Confirm the exact PWM output pins and shared-function limitations in the pin-description table before assigning indicator circuitry.
Simple Motor and Actuator Control
The PIC16F818-I/SO can serve as the control element in small fan, valve, or actuator modules where the required functions fit within 1.75 KB of flash and five 10-bit ADC channels. Timers and PWM support speed commands, duty-cycle control, or timed movement, while digital inputs can represent limit switches and position sensors. A suitable external driver and protection stage remain necessary because the microcontroller should not directly drive motors or high-current inductive loads. Use the internal 8 MHz oscillator for straightforward timing or operate at the 20 MHz maximum when task scheduling requires it. Validate stall conditions, shutdown behavior, and noise immunity in the complete motor-control assembly.
Battery-Powered Data Logger
PIC16F818-I/SO is appropriate for small battery-powered data loggers that periodically sample analog inputs and store critical settings between sessions. Its five 10-bit ADC channels can support pressure, temperature, or level sensing, while 128 bytes of EEPROM provides limited nonvolatile parameter storage. The flash program memory can hold a compact sampling routine, calibration conversion, and a simple file-index scheme. The manufacturer data identifies a maximum supply current of 4.0 mA, but average system demand depends on active duration, sleep modes, and peripheral use. Validate low-power timing and leakage in the finished product, and size external storage if continuous logging exceeds the internal memory budget.
Industrial Measurement Module
PIC16F818-I/SO can form the core of an industrial measurement module that converts several analog inputs into digital control or serial data. The five-channel 10-bit ADC supports multichannel monitoring, and the configurable SPI or I²C interface connects to local displays, isolated transceivers, or external data-acquisition components. Sixteen I/O pins leave capacity for digital thresholds, alarm outputs, configuration inputs, and status indicators. The internal 8 MHz oscillator is useful for deterministic control without an external crystal, while the 20 MHz maximum provides additional execution headroom. In production equipment, place the analog section away from relay and switching-power nodes, provide appropriate input protection, and verify calibration behavior across the intended operating-temperature range.
工程参考数据： PIC16F818-I/SO ——对比、设计指导和合规信息。
选型指南
与替代料对比
| 参数 | 本产品 | PIC16F819-I/SO |
|---|---|---|
| Brand | Microchip Technology | Microchip Technology |
| Package | 18-pin SOIC | 18-pin SOIC |
| Architecture | 8-bit PIC RISC | 8-bit PIC RISC |
| Program Memory | 1.75 KB flash | More than 1.75 KB |
关键差异点
- Compact integration of analog conversion and serial control （对比 PIC16F819-I/SO)
- Lower program-memory footprint for focused embedded tasks （对比 PIC16F819-I/SO)
- Peripheral coverage without external converter ICs （对比 PIC16F819-I/SO)
设计说明
Assign every PCB net from the 18-pin SOIC pin-description table and package drawing rather than from a generic PIC16 footprint. Confirm multiplexed functions, programming pins, analog inputs, oscillator pins, and supply pins before routing. Place the supply bypass capacitor adjacent to the device's supply and ground pins, and keep analog inputs away from switching-node copper to reduce conversion error.
The manufacturer lists a maximum supply current of 4.0 mA, but average consumption depends on execution rate, enabled peripherals, I/O loading, and sleep duration. For battery designs, calculate duty-cycle current using the device operating modes and include regulator, sensor, and communication-module consumption. Do not use the headline current value as a complete system power budget.
The five ADC channels should use short traces, a solid ground reference, and input networks selected for the sensor's output impedance and bandwidth. Keep the analog return path separate from high-current return currents where practical. If the internal 8 MHz oscillator is adequate, omitting an external crystal reduces component count, but validate timing margins and clock-sensitive peripheral behavior before committing the layout.
A physical fit in an 18-pin SOIC footprint does not by itself establish drop-in compatibility. When evaluating PIC16F819-I/SO, compare flash-memory assumptions, EEPROM capacity, peripheral multiplexing, interrupt behavior, programming configuration, and timing-sensitive firmware. Also verify the complete operating-voltage and temperature ranges because those values are required for a production release.
合规信息
Compliance declarations were not stated in the device-specific product material. Confirm RoHS, REACH, lead-free, halogen-free, conflict-minerals, and automotive qualification status with the manufacturer before release. AEC-Q100 may not apply to this industrial-temperature MCU variant.