PIC16F818T-I/SS - 8-bit PIC MCU, 20MHz, 1.75KB Flash, SSOP-20 | Microchip
MPN: PIC16F818T-I/SS ✓ Hoạt độngPIC16F818T-I/SS Tóm tắt
A PIC microcontroller (Programmable Intelligent Computer) is a family of Harvard-architecture 8/16/32-bit microcontrollers built around a精简指令集 (RISC) core with separate program and data buses. Within Microchip's hierarchy it sits at the PIC16 mid-range tier (PIC10/12/16/18/24/32 families), positioned between baseline 8-pin PIC10/PIC12 devices and high-performance PIC18/PIC24/PIC32 devices. The mid-range PIC16F core is the workhorse family for cost-sensitive embedded control, known for deterministic interrupt response and a small, easy-to-learn instruction set (35 single-word instructions for the PIC16F818).
The PIC16F818 integrates 16 digital I/O pins, an 8MHz internal oscillator, 10-bit ADC, two PWM modules, a hardware USART, I2C and SPI peripherals, brown-out reset, power-on reset, watchdog timer, and Microchip's nanoWatt power-management technology for low-power sleep modes. It is code- and pin-compatible with the larger PIC16F819 (2KB Flash / 256B SRAM) and shares peripherals with the 18-pin PIC16F88.
Architecturally, the device uses a 14-bit instruction word and a Harvard bus, giving single-cycle instruction fetch with separate program Flash and data SRAM buses. This separation eliminates von Neumann fetch-decode bottlenecks and is the foundation of the PIC family's deterministic interrupt latency. The 8MHz internal RC oscillator can be software-tuned via the OSCTUNE register, eliminating external crystals in many cost-sensitive designs.
Typical applications include consumer appliance control, sensor signal conditioning, low-end motor control loops, battery chargers, LED lighting controllers, and educational/hobbyist platforms where PIC16F mid-range familiarity is preferred. The compact SSOP-20 footprint and industrial temperature grade suit space-constrained commercial and industrial products.
When migrating from PIC16C5X/PIC16C62xA/PIC16C7x/PIC12CXXX designs, the PIC16F818 retains socket-and-code compatibility for most peripheral functions while adding Flash reprogrammability and nanoWatt low-power features.
This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet - including guidance on internal-oscillator accuracy, ICSP programming pinout, and a same-package migration path to PIC16F819 for designers who later need additional program memory.
Bộ thay thế dễ dàng lắp đặt cho PIC16F818T-I/SS — cùng gói, chân-to-chân tương thích. Các bộ phận yêu cầu hàn PCB bị loại trừ.
Các biến thể trong loạt này
Các mẫu cùng loạt có thể lắp đặt dễ dàng tương thích với PIC16F818T-I/SS (cùng hình factor và footprint) — khác nhau ở Package, Core Architecture, ADC, Internal Oscillator, Operating Temperature.
PIC16F818-I/SS
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →PIC16F818T-E/SS
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →PIC16F818-E/SS
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
PIC16F819T-I/SS
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
PIC16F819T-E/SS
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →PIC16F818T-I/SS Tỷ lệ tối đa & tính chất điện
| Core Processor | PIC |
| Core Size | 8-bit |
| Core Series | PIC16 |
| Maximum CPU Speed | 20 MHz |
| Instruction Cycle Time | 200 ns |
| Program Memory Type | Flash |
| Program Memory Size | 1.75 KB (1K x 14) |
| Data RAM (SRAM) | 128 B |
| EEPROM Data Memory | 128 B |
| Number of I/O Pins | 16 |
| Package Type | SSOP-20 (5.30 mm body width) |
| Package Code | SS |
| Kiểu lắp đặt | Surface Mount |
| Packaging | Tape & Reel (TR) |
| Khoảng nhiệt độ hoạt động | -40 C to +85 C (Industrial) |
| Supply Voltage Range | 2.0 V to 5.5 V |
| Internal Oscillator | 8 MHz (software-tunable via OSCTUNE) |
| Connectivity Peripherals | I2C, SPI, USART |
| On-chip Peripherals | Brown-out Detect/Reset, POR, PWM, WDT |
| Number of PWM Channels | 2 (10-bit) |
| ADC | 10-bit |
| Instruction Set Size | 35 single-word instructions |
| Upward Compatible With | PIC16C7x, PIC16C62xA, PIC16C5X, PIC12CXXX |
| Trạng thái RoHS | Compliant |
| Lead-free / Halogen-free | Yes (per Microchip RoHS statement) |
Cấu hình chân PIC16F818T-I/SS
| Chân 1 | MCLR/VPP/RE3 — Master Clear (reset) input / programming voltage input / digital I/O |
| Chân 2 | RA0/AN0 — PORTA bit 0 / analog input channel 0 |
| Chân 3 | RA1/AN1 — PORTA bit 1 / analog input channel 1 |
| Chân 4 | RA2/AN2/VREF- — PORTA bit 2 / analog input channel 2 / ADC negative reference |
| Chân 5 | RA3/AN3/VREF+ — PORTA bit 3 / analog input channel 3 / ADC positive reference |
| Chân 6 | RA4/AN4/T0CKI — PORTA bit 4 / analog input channel 4 / Timer0 clock input |
| Chân 7 | RA5/AN5/SS — PORTA bit 5 / analog input channel 5 / SPI slave select |
| Chân 8 | VSS — Ground reference |
| Chân 9 | OSC1/RA7 — Oscillator crystal input / PORTA bit 7 |
| Chân 10 | OSC2/RA6 — Oscillator crystal output / PORTA bit 6 |
| Chân 11 | RC0/T1OSO/T1CKI — PORTC bit 0 / Timer1 oscillator output / Timer1 clock input |
| Chân 12 | RC1/T1OSI/CCP2 — PORTC bit 1 / Timer1 oscillator input / CCP2 PWM output |
| Chân 13 | RC2/CCP1 — PORTC bit 2 / CCP1 PWM output |
| Chân 14 | RC3/SCK/SCL — PORTC bit 3 / SPI clock / I2C clock |
| Chân 15 | RC4/SDI/SDA — PORTC bit 4 / SPI data in / I2C data |
| Chân 16 | RC5/SDO — PORTC bit 5 / SPI data out |
| Chân 17 | RC6/TX/CK — PORTC bit 6 / USART transmit / USART clock |
| Chân 18 | RC7/RX/DT — PORTC bit 7 / USART receive / USART data |
| Chân 19 | RB6/PGC — PORTB bit 6 / ICSP clock input |
| Chân 20 | RB7/PGD — PORTB bit 7 / ICSP data I/O |
Ứng dụng tiêu biểu
PIC16F818T-I/SS phù hợp cho 6 Áp dụngs: Consumer Appliance Control (Washing Machines, Microwave Ovens), Battery-Powered Sensor Nodes (nanoWatt Sleep Modes), LED Lighting Controllers and DMX Decoders, Industrial Sensor Signal Conditioning, Low-End Motor Control (DC, Stepper, Small BLDC), Educational and Hobbyist Development Platforms.
Consumer Appliance Control (Washing Machines, Microwave Ovens)
The PIC16F818T-I/SS suits consumer appliance control boards where cost dominates over raw performance: washing machine motor drivers, microwave oven keypads and timers, dishwasher control logic, and refrigerator user interfaces. The 16 digital I/O pins comfortably drive LED or seven-segment displays, button matrices, and triac/relay control lines for solenoid valves and heater elements, while the two 10-bit PWM channels deliver precise motor-speed control for brushless DC fans or universal motors. The industrial -40C to +85C rating covers the kitchen and laundry thermal envelope, and the 8MHz internal oscillator eliminates two external crystal pins and reduces BOM cost by ~$0.10-0.20 per board. Microchip's MPLAB X IDE free toolchain plus the PICkit 3/4 ICSP programmer enable rapid firmware iteration during the white-goods design cycle.
Được đề xuất
Battery-Powered Sensor Nodes (nanoWatt Sleep Modes)
The PIC16F818T-I/SS's nanoWatt technology makes it well-suited for battery-powered wireless sensor endpoints including HVAC thermometers, irrigation soil-moisture probes, and battery-backed security sensors. Sleep current drops to roughly 50nA typical with the watchdog timer and RTCC active, allowing coin-cell-powered designs to achieve multi-year battery life when the CPU wakes only on a periodic interrupt (e.g., once per minute) or external edge interrupt. The integrated 10-bit ADC reads thermistor, photocell, or other analog sensors without external signal conditioning, and the 128-byte EEPROM stores calibration constants and rolling counters that survive power cycles. At 20MHz active the device still draws only a few mA, balancing measurement bursts and communication windows efficiently.
Được đề xuất
LED Lighting Controllers and DMX Decoders
The PIC16F818T-I/SS integrates two 10-bit PWM channels plus a hardware USART, which is sufficient for entry-level LED lighting controllers driving RGB or RGBW strips via MOSFET driver stages, or for DMX-512 slave decoders receiving dimming commands over a 250kbps RS-485 link. The PWM hardware generates flicker-free dimming across the full 0-100% range without CPU overhead, while the USART handles DMX break detection and packet framing in interrupt service routines. The 20MHz instruction cycle supports 8-bit PWM resolution at >1kHz refresh - well above the 100Hz threshold for human-flicker perception. The 128-byte EEPROM stores DMX addresses and curve profiles that survive power cycles, simplifying commissioning.
Được đề xuất
Industrial Sensor Signal Conditioning
Industrial signal-conditioning front-ends - 4-20mA loop transmitters, RTD/thermocouple amplifiers, and bridge sensor digitizers - can leverage the PIC16F818T-I/SS's 10-bit ADC, I2C/SPI connectivity, and 2.0V to 5.5V supply range. The PIC16F818 reads the conditioned analog signal, applies digital filtering and linearization in firmware, and outputs the processed value over I2C to a host PLC or SPI to a local display. The industrial -40C to +85C temperature grade covers factory-floor environments, and the brown-out reset and watchdog timer protect against the voltage transients common on 24V industrial bus rails. The internal 8MHz oscillator accuracy is adequate for slow-changing process signals (<100Hz bandwidth) where timing precision is not critical.
Được đề xuất
Low-End Motor Control (DC, Stepper, Small BLDC)
The PIC16F818T-I/SS's two 10-bit PWM channels plus four additional CCP/timer-driven I/O make it suitable for low-end brushed DC motor speed control, unipolar stepper motor sequencing, and small sensorless BLDC fans in 12V-24V systems. The PWM outputs drive external half-bridge drivers (e.g., DRV8870, L293D) while the ADC reads back current-sense amplifier outputs for closed-loop torque or speed regulation. Stepper sequencing can run off timer interrupts at sub-microsecond resolution thanks to the 200ns instruction cycle. The ICSP programming header permits in-system firmware tuning of PID coefficients during prototype bring-up, and the 128-byte EEPROM stores trim values and motor profiles per axis.
Được đề xuất
Educational and Hobbyist Development Platforms
The PIC16F818T-I/SS is a popular educational MCU because it combines a forgiving PIC16 mid-range instruction set (only 35 single-word instructions to learn) with enough peripherals - 16 I/O, ADC, PWM, USART, I2C, SPI - for genuine embedded-systems coursework. University EE/CE programs and makerspace workshops choose the PIC16F818 for first-year microcontroller labs because MPLAB X IDE, XC8 compiler, and PICkit 3/4 programmer are all free for non-commercial use. The SSOP-20 package fits standard 0.1-inch-pitch breakout boards with breakout adapter PCBs, and the wide 2.0V-5.5V supply range lets students power boards from USB, 3.3V LDO, or 2xAA batteries interchangeably during labs.
Được đề xuất
Tóm tắt các sản phẩm được đề xuất
Dữ liệu tham khảo kỹ thuật cho PIC16F818T-I/SS — so sánh, hướng dẫn thiết kế và thông tin tuân thủ.
Hướng dẫn chọn lựa
So sánh với các sản phẩm thay thế
| Tham số | Sản phẩm này | PIC16F818-I/SS | PIC16F818T-E/SS | PIC16F818-E/SS | PIC16F819T-I/SS | PIC16F819T-E/SS |
|---|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | SSOP-20 | SSOP-20 (same) | SSOP-20 (same) | SSOP-20 (same) | SSOP-20 (same) | SSOP-20 (same) |
| Program Memory (Flash) | 1.75 KB (1K x 14) | 1.75 KB | 1.75 KB | 1.75 KB | 3.5 KB (2K x 14) | 3.5 KB (2K x 14) |
| Data RAM (SRAM) | 128 B | 128 B | 128 B | 128 B | 256 B | 256 B |
| EEPROM | 128 B | 128 B | 128 B | 128 B | 256 B | 256 B |
| Maximum CPU Speed | 20 MHz | 20 MHz | 20 MHz | 20 MHz | 20 MHz | 20 MHz |
| Operating Temperature Range | -40 C to +85 C (Industrial) | -40 C to +85 C (Industrial) | -40 C to +125 C (Extended) | -40 C to +125 C (Extended) | -40 C to +85 C (Industrial) | -40 C to +125 C (Extended) |
| Packaging Format | Tape & Reel (TR) | Tube | Tape & Reel | Tube | Tape & Reel | Tape & Reel |
Bảo phân biệt quan trọng
- Tape-and-reel packaging optimized for high-volume SMT production (vsPIC16F818-I/SS)
- Extended temperature grade variant available for harsh environments (vsPIC16F818T-E/SS)
- Drop-in memory upgrade path to PIC16F819 family (vsPIC16F819T-I/SS)
Ghi chú thiết kế
Do not leave the MCLR pin floating. The PIC16F818T-I/SS requires MCLR tied to VDD through a 10k pull-up resistor (or directly to VDD for applications not needing external reset). A floating MCLR pin causes erratic resets and unreliable startup, especially in electrically noisy environments like motor control or relay-driven appliances. For ICSP programming, MCLR must be accessible to the programmer via a 10k isolation resistor or direct connection through the ICSP header.
Place a 100nF decoupling capacitor as close as possible to the VDD pin (pin 19) and another on the AVdd-related supply trace if separate analog supply pins are used. For designs using the internal oscillator only, no external crystal load capacitors are needed; this saves two PCB pads and reduces BOM cost. Keep the ICSP pins (RB6/PGC and RB7/PGD) accessible on a 5-pin header with VPP, VDD, VSS routed to the connector for in-circuit programming without removing the MCU from the board.
For battery-powered designs leveraging nanoWatt sleep modes, switch off unused peripherals via the peripheral disable registers (PCON, CMCON, ADCON0) before entering Sleep instruction. The brown-out reset (BOR) should be enabled via the configuration bits to protect EEPROM contents during voltage dips - critical for designs storing calibration constants or count values in the 128-byte EEPROM. Wake from sleep via Watchdog Timer overflow, external interrupt on RB0, or peripheral interrupt from the ADC/comparator modules.
Thông tin tuân thủ
RoHS and REACH compliant per Microchip product page. AEC-Q100 not qualified - for automotive AEC-Q100 qualified PIC16F818 variants consult Microchip's automotive-grade portfolio. Lead-free and halogen-free per Microchip environmental compliance statement.
