PIC16F818-I/SS - 8-bit 20MHz 1.75KB Flash MCU | Microchip
MPN: PIC16F818-I/SS ✓ Hoạt độngPIC16F818-I/SS Tóm tắt
An 8-bit microcontroller (MCU) is a single-chip computer that integrates an 8-bit CPU, program memory (ROM/Flash), data memory (RAM), I/O peripherals and a clock source on one silicon die. Within the embedded hierarchy, the PIC16F818 belongs to the PIC16F family of microcontrollers, which sits within Microchip's 8-bit PIC product line, which is itself a category of microcontrollers (MCU), which is a category of embedded processors, which is a category of semiconductors. The PIC16F818 is pin-compatible with the PIC16F819, and is software- and peripheral-compatible with the larger PIC16C7x, PIC16C62xA, PIC16C5X and PIC12CXXX families, giving designers an easy migration path from older OTP or ROM-based parts to Flash-based silicon.
Key features include an internal 8 MHz oscillator (no external crystal required for many designs), 16 I/O pins with individually programmable direction, a 10-bit ADC with up to 5 channels, an enhanced Capture/Compare/PWM (ECCP) module, an MSSP port supporting SPI and I2C (master/slave), an asynchronous USART for RS-232/RS-485, two 8-bit timers plus one 16-bit timer, and a watchdog timer with its own on-chip low-power RC oscillator. The Flash program memory supports in-circuit serial programming (ICSP) via two pins, allowing firmware updates after PCB assembly.
The PIC16F818 operates from 2.0 V to 5.5 V across the industrial -40C to +85C range, suiting it for 3.3 V and 5 V designs. With a typical active current of <2 mA at 4 MHz and 5 V, plus sub-microamp sleep currents with brown-out reset (BOR) enabled, the part targets low-power embedded nodes. The 20-pin SSOP (5.30 mm body) provides a compact 0.65 mm pitch footprint, balancing IO count with board-area efficiency.
Typical applications include consumer appliance control panels, sensor interface nodes, simple LED lighting controllers, low-cost motor control loops, and battery-powered instrument peripherals. For designs needing more memory or a second comparator, designers can drop in the PIC16F819 (2K Flash) without changing the PCB.
When designing with this MCU, reserve the ICSPDAT/ICSPCLK pins (typically RB7/RB6) so that in-circuit programming remains possible in production. Place a 100 nF decoupling capacitor within 5 mm of VDD, and a bulk 10 uF if the application drives heavy loads from the same rail. Verify MCLR behaviour - the device ships with MCLR disabled; an external pull-up or dedicated reset circuit may be required.
This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet.
Bộ thay thế dễ dàng lắp đặt cho PIC16F818-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 PIC16F818-I/SS (cùng hình factor và footprint) — khác nhau ở Package, Core Architecture, ADC, Operating Temperature, Timers.
PIC16F819-I/SS
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →PIC16F818T-I/SS
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →PIC16F818-E/SS
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
PIC16F84A-I/P
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
PIC16F87-I/SS
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →PIC16F88-I/SS
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →PIC16F818-I/SS Tỷ lệ tối đa & tính chất điện
| Core | 8-bit PIC16 RISC |
| Program Memory (Flash) | 1.75 KB (1K x 14 words) |
| Data RAM | 128 bytes |
| Data EEPROM | 128 bytes |
| Maximum CPU Speed | 20 MHz |
| Instruction Cycle | 200 ns |
| I/O Pins | 16 |
| ADC | 10-bit, 5 channels |
| Timers | 2 x 8-bit + 1 x 16-bit |
| Communication | SPI, I2C (MSSP), USART (RS-232/RS-485) |
| PWM | Enhanced CCP (ECCP) |
| Internal Oscillator | 8 MHz |
| Điện áp cung cấp | 2.0 V to 5.5 V |
| Nhiệt độ hoạt động | -40C to +85C (Industrial) |
| Hộp | 20-pin SSOP (5.30 mm body, 0.65 mm pitch) |
| Watchdog Timer | Yes, with dedicated on-chip low-power RC oscillator |
| Brown-out Reset (BOR) | Yes |
| In-Circuit Programming | ICSP via 2 pins |
| Trạng thái RoHS | Compliant |
Cấu hình chân PIC16F818-I/SS
| Chân 1 | RA0/AN0 — Digital I/O / ADC channel 0 input |
| Chân 2 | RA1/AN1 — Digital I/O / ADC channel 1 input |
| Chân 3 | RA2/AN2/VREF- — Digital I/O / ADC channel 2 / ADC negative reference |
| Chân 4 | RA3/AN3/VREF+ — Digital I/O / ADC channel 3 / ADC positive reference |
| Chân 5 | RA4/AN4/T0CKI — Digital I/O (open-drain) / ADC channel 4 / Timer0 clock input |
| Chân 6 | RA5/SS/AN5 — Digital I/O / SPI Slave Select / ADC channel 5 (20-pin only) |
| Chân 7 | RA6/OSC2/CLKO — Digital I/O / oscillator output / clock out |
| Chân 8 | RA7/OSC1/CLKI — Digital I/O / oscillator input / clock in |
| Chân 9 | VDD — Positive supply (2.0 V to 5.5 V) |
| Chân 10 | VSS — Ground reference |
| Chân 11 | RB0/INT — Digital I/O / external interrupt |
| Chân 12 | RB1 — Digital I/O |
| Chân 13 | RB2 — Digital I/O |
| Chân 14 | RB3/PGM — Digital I/O / LVP programming pin |
| Chân 15 | RB4 — Digital I/O |
| Chân 16 | RB5 — Digital I/O |
| Chân 17 | RB6/PGC — Digital I/O / ICSP clock |
| Chân 18 | RB7/PGD — Digital I/O / ICSP data |
| Chân 19 | MCLR/VPP/RE3 — Master clear / programming voltage / digital I/O |
| Chân 20 | NC — Not connected (no internal connection) |
Ứng dụng tiêu biểu
PIC16F818-I/SS phù hợp cho 6 Áp dụngs: Consumer Appliance Control Panels, Battery-Powered Sensor Nodes, LED Lighting Controllers, Low-Cost Motor Control Loops, Instrument and Metering Peripherals, In-Circuit Programmable IoT Bridges.
Consumer Appliance Control Panels
The PIC16F818-I/SS is well suited for consumer appliance control panels such as washing-machine interfaces, microwave keypads, and HVAC thermostat units. Its 1.75 KB of Flash is enough for keypad scanning, debounce logic, and LCD/segmented display drivers, while 128 bytes of EEPROM stores user preferences and last-state memory. The 10-bit ADC handles temperature or humidity sensor inputs in HVAC applications, and the USART links the control board to a main inverter board. Power is typically 5 V from the appliance rail, fully inside the PIC16F818's 2.0-5.5 V operating range. SSOP-20 fits inside tight user-interface bezels where every mm of board area matters.
Được đề xuất
Battery-Powered Sensor Nodes
Battery-powered sensor nodes benefit from the PIC16F818-I/SS nanoWatt technology features including sub-microamp sleep current, BOR, and a low-power watchdog on its own RC oscillator. A 4 MHz INTOSC plus sleep current under 1 uA lets the part run for years on a single CR2032 in intermittent duty. The MSSP peripheral handles I2C or SPI sensor readouts (temperature, pressure, accelerometers), and the internal 10-bit ADC samples additional analog channels without an external ADC chip. The part wakes on watchdog timeout, captures a sensor reading, decides if a radio wake-up is needed, and returns to sleep. Industrial -40C to +85C temperature range covers most outdoor and metering scenarios.
Được đề xuất
LED Lighting Controllers
Small-form-factor LED lighting controllers for under-cabinet fixtures, decorative strips, or aquarium lighting exploit the PIC16F818-I/SS's Enhanced CCP (ECCP) PWM module to drive one or more LED channels with hardware-based dead-band control. A 10-bit ADC reads ambient light sensors for daylight harvesting, and an internal 8 MHz oscillator removes the need for an external timing component. The MSSP accepts digital addressable LED protocols (WS2812-style) or analog current-sense feedback. With 16 I/O pins, the same SSOP-20 part handles several low-side LED drivers plus a DMX/RDM-style UART input. At 2.0 V minimum, the part runs from LED driver rails as low as two NiMH cells.
Được đề xuất
Low-Cost Motor Control Loops
Small DC motor and unipolar stepper control loops in toys, small appliances, and pumps can be built around the PIC16F818-I/SS with its ECCP PWM output, two 8-bit and one 16-bit timer. Closed-loop speed control via the 10-bit ADC reading back-EMF or current sense is straightforward in 1.75 KB of Flash. The USART communicates with a host controller or accepts sensorless position feedback. Industrial temperature rating lets the same firmware run in automotive accessories and white-goods motor boards. For more memory or higher PWM resolution, the pin-compatible PIC16F819-I/SS is the documented upgrade path without changing the PCB.
Được đề xuất
Instrument and Metering Peripherals
Peripherals for bench instruments, weighing scales, and metering devices use the PIC16F818-I/SS to read sensors, manage a small character LCD, and exchange data with a host through SPI or I2C. The 128-byte EEPROM saves calibration constants or user-defined ranges, eliminating the need for an external serial EEPROM. A 10-bit ADC with selectable VREF accommodates load-cell and shunt-resistor current measurements down to mV levels. The part operates over 2.0-5.5 V, fitting both battery-powered and line-powered instrument tops. The internal 8 MHz oscillator provides timing accuracy sufficient for most sensor-sampling work.
Được đề xuất
In-Circuit Programmable IoT Bridges
The PIC16F818-I/SS acts as a low-cost bridge between legacy industrial equipment and modern IoT gateways by serving as a serial protocol converter (RS-232/RS-485 USART to SPI or I2C to an attached radio module). Its Flash memory is in-circuit programmable via ICSP, allowing field firmware updates over a programming header without removing the device. Industrial -40C to +85C operation covers factory floors and outdoor cabinets. The watchdog timer on its own internal RC oscillator offers fail-safe operation independent of the main clock. Combined with the 128-byte EEPROM for bridge configuration storage, it is a cost-effective way to retrofit old equipment.
Được đề xuất
Tóm tắt các sản phẩm được đề xuất
Dữ liệu tham khảo kỹ thuật cho PIC16F818-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 | PIC16F819-I/SS | PIC16F818T-I/SS | PIC16F818-E/SS | PIC16F88-I/SS | PIC16F87-I/SS |
|---|---|---|---|---|---|---|
| Package | 20-pin SSOP | 20-pin SSOP - same | 20-pin SSOP - same | 20-pin SSOP - same | 20-pin SSOP - same | 20-pin SSOP family - same |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Program Memory (Flash) | 1.75 KB (1K x 14) | 3.5 KB (2K x 14) | 1.75 KB (1K x 14) | 1.75 KB (1K x 14) | 7 KB (4K x 14) | 7 KB (4K x 14) |
| Data RAM | 128 B | 128 B | 128 B | 128 B | 256 B | 256 B |
| Data 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 |
| I/O Pins | 16 | 16 | 16 | 16 | 16 | 16 |
| ADC Channels | 5 | 5 | 5 | 5 | 7 | 5 |
| Temperature Grade | Industrial -40C to +85C | Industrial -40C to +85C | Industrial -40C to +85C | Extended -40C to +125C | Industrial -40C to +85C | Industrial -40C to +85C |
Bảo phân biệt quan trọng
- On-chip 128-byte EEPROM for data retention (vsPIC16F84A-I/P)
- On-chip 10-bit ADC eliminates external converter (vsPIC16F84A-I/P)
- Internal 8 MHz INTOSC removes external crystal (vsPIC16F84A-I/P)
- Enhanced CCP (ECCP) PWM for half-bridge/full-bridge drives (vsPIC16F84A-I/P)
Ghi chú thiết kế
ICSP pins RB7 (PGD) and RB6 (PGC) must remain accessible to the in-circuit programmer. Per the PIC16F818 datasheet (39598E), tying these pins hard to GND or VDD, or using them as heavy-current outputs without isolation resistors, can block production programming and field firmware updates. Keep the traces short and avoid large fanouts; if the pins must drive external circuitry, buffer them through a resistor network that does not exceed the programming port's drive.
Place a 100 nF (0.1 uF) decoupling capacitor within 5 mm of the VDD pin to filter high-frequency switching noise from the internal core, and add a bulk 10 uF on the board if multiple loads share the same 3.3 V or 5 V rail. Brown-out reset (BOR) is enabled by configuration word and holds the part in reset until VDD rises above the BOR threshold, which protects Flash during unstable power-up. Verify that the chosen BOR level matches the regulator's startup ramp time for the application.
When the internal 8 MHz oscillator is used, do NOT leave the OSC1/OSC2 (RA6/RA7) traces dangling. Per the datasheet (39598E), unconfigured oscillator pins must be left as standard digital I/O, but if crystal mode is selected in the configuration word, leave the traces symmetric and short to avoid stray capacitance mis-tuning the oscillator. Estimated: with a 20 MHz crystal and 15 pF loading caps, traces longer than 5 mm should be guarded with a grounded shield.
The 10-bit ADC reference (VREF+/VREF-) can be tied to VDD/VSS for cost-sensitive designs, but for accurate readings below 50 mV (current-sense, thermocouple junctions, weigh scales), use an external low-noise reference voltage tied to RA3/RA2. Estimated: with VDD=5 V and VREF+=4.096 V, each LSB of the 10-bit ADC measures 4 mV, which is adequate for most sensor bridge signals; an internal reference or external rail-to-rail buffer improves linearity at low ADC counts.
Thông tin tuân thủ
Microchip's product page lists the SSOP-20 package as RoHS compliant and lead-free. The PIC16F818-I/SS is industrial-grade (-40C to +85C) and not AEC-Q100 qualified; for automotive applications the user should select a Q-graded Microchip part instead.
