PIC16F818-E/SO - 8-bit 20MHz MCU, 1.75KB Flash | Microchip
MPN: PIC16F818-E/SO ✓ Hoạt độngPIC16F818-E/SO Tóm tắt
An 8-bit microcontroller is a single-chip computer built around an 8-bit data path and a Harvard memory architecture that separates program and data buses; the PIC16F818 family occupies the enhanced mid-range tier of Microchip's PIC16 portfolio, sitting below the PIC18 in raw performance and above the baseline PIC10/12/16 in peripheral integration. The -E suffix indicates an extended operating temperature range of -40 °C to +125 °C, qualifying the part for industrial and harsh-environment designs that exceed the 85 °C ceiling of the standard -I parts.
Key features include one 8-bit and one 16-bit timer/counter with a configurable Capture/Compare/PWM module, a synchronous serial port configurable as either 3-wire SPI or 2-wire I²C, an internal 8 MHz oscillator with PLL-free operation, and 10 source/sink current capability on selected I/O. The nanoWatt technology reduces quiescent current below typical MCU averages during sleep, enabling battery-friendly duty-cycled sensor applications. Brown-out Reset, Power-on Reset, and Watchdog Timer with on-chip RC oscillator are integrated to improve system robustness without external supervision parts.
Architecturally the device uses a 14-bit instruction word with single-cycle execution for most opcodes, an 8-level hardware stack for subroutines, and direct/indirect/relative addressing modes. The 10-bit ADC achieves approximately 1 LSB DNL/INL with successive-approximation conversion, while the synchronous SSP block supports both Master/Slave SPI and Master/Slave I²C with 7-bit or 10-bit addressing.
Typical applications include industrial sensor interfaces, low-cost motor control nodes, battery-powered instrumentation, and consumer appliance user-interface controllers where the 18-pin footprint, integrated ADC, and extended temperature grade simplify compliance. Designers also deploy it in HVAC controls, security peripherals, and small-form-factor IoT edge nodes where PCB real estate and unit cost dominate component selection. The device is supported by MPLAB X IDE, the XC8 compiler, and a mature ecosystem of application libraries.
When designing with this part, choose decoupling per the Microchip PIC16F818/819 datasheet: place a 100 nF ceramic capacitor within 5 mm of VDD, keep the MCLR pull-up close to the pin, and avoid routing high-current switching traces adjacent to the analog AVSS/AVDD pair to preserve ADC accuracy. The wide SOIC body (0.295 in / 7.5 mm) eases hand-prototyping but consumes more board area than the SSOP or QFN variants.
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-E/SO — 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-E/SO (cùng hình factor và footprint) — khác nhau ở Package, Core Architecture, Operating Temperature, Timers, Internal Oscillator.
PIC16F818-I/SO
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
PIC16F819-I/SO
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →PIC16F818-E/P
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →PIC16F818-E/SS
✅ Drop-In ⚠️ Thông số chưa được xác minh📋 Tham chiếu thay thế (không có trong danh mục)
PIC16F818-E/ML
✅ Drop-In ⚠️ Thông số chưa được xác minhLiên hệ để biết giá
Xem tài liệu →PIC16F818-E/SO Tỷ lệ tối đa & tính chất điện
| Core Architecture | PIC16 enhanced mid-range 8-bit Harvard |
| Program Memory (Flash) | 1.75 KB (1K x 14 words) |
| RAM | 128 bytes |
| EEPROM Data Memory | 128 bytes |
| CPU Speed | 20 MHz (200 ns instruction cycle) |
| Internal Oscillator | 8 MHz (factory calibrated) |
| I/O Pins | 16 |
| ADC | 5 channels, 10-bit |
| Timers | 1 x 8-bit, 1 x 16-bit with CCP/PWM |
| Serial Interface | SSP (SPI or I²C, Master/Slave) |
| Hộp | 18-SOIC (0.295 in / 7.5 mm width) |
| Nhiệt độ hoạt động | -40 °C to +125 °C (extended, -E suffix) |
| Kiểu lắp đặt | Surface Mount |
| Trạng thái RoHS | Compliant |
| Lead-Free | Yes |
Cấu hình chân PIC16F818-E/SO
| Chân 1 | MCLR/Vpp — Master Clear (Reset) input / Programming voltage |
| Chân 2 | RA0/AN0 — Digital I/O / Analog input channel 0 |
| Chân 3 | RA1/AN1 — Digital I/O / Analog input channel 1 |
| Chân 4 | RA2/AN2/Vref- — Digital I/O / Analog input channel 2 / ADC Vref- |
| Chân 5 | RA3/AN3/Vref+ — Digital I/O / Analog input channel 3 / ADC Vref+ |
| Chân 6 | RA4/AN4 — Digital I/O / Analog input channel 4 |
| Chân 7 | RA5 — Digital I/O |
| Chân 8 | VSS — Ground reference |
| Chân 9 | OSC1/RA7 — External oscillator input / Digital I/O |
| Chân 10 | OSC2/RA6 — External oscillator output / Digital I/O |
| Chân 11 | RC0 — Digital I/O |
| Chân 12 | RC1 — Digital I/O |
| Chân 13 | RC2 — Digital I/O |
| Chân 14 | RC3 — Digital I/O |
| Chân 15 | RC4 — Digital I/O |
| Chân 16 | RC5 — Digital I/O |
| Chân 17 | RC6 — Digital I/O |
| Chân 18 | RC7 — Digital I/O |
Ứng dụng tiêu biểu
PIC16F818-E/SO phù hợp cho 7 Áp dụngs: Industrial Sensor Interface Node, Battery-Powered Instrumentation, Low-Cost Motor Control, Consumer Appliance User Interface, HVAC Control Peripheral, Security System Peripheral, Small IoT Edge Node.
Industrial Sensor Interface Node
The PIC16F818-E/SO is a strong fit for industrial sensor interface nodes because its 5 channels of 10-bit ADC cover the typical multi-sensor multiplexing required for temperature, pressure, and flow inputs, while the integrated 8 MHz internal oscillator eliminates external crystal cost and the -40 °C to +125 °C extended temperature grade passes harsh-environment compliance. Placed on a sensor PCB with a 100 nF decoupling cap near VDD, it converts analog inputs and forwards them via SSP-configured I²C to a host controller; compared to a discrete op-amp + ADC chain, the integrated converter shrinks the BOM and lowers per-node cost by roughly 30 to 40 percent.
Được đề xuất
Battery-Powered Instrumentation
The PIC16F818-E/SO's nanoWatt technology and software-controlled sleep modes make it suitable for battery-powered instrumentation where quiescent current dominates runtime. With internal 8 MHz oscillator, on-board EEPROM for parameter storage, and low-power sleep currents in the microamp range per the PIC16F818/819 datasheet, the MCU supports duty-cycled wake-measure-murit cycles that stretch coin-cell life into multi-year territory. Compared to running the same workload on a 32-bit Cortex-M0, the PIC16F818-E/SO typically achieves 2-5x lower active-mode power on bit-banged I/O tasks.
Được đề xuất
Low-Cost Motor Control
The PIC16F818-E/SO is well-suited to small brushed DC and unipolar stepper motor control thanks to its integrated Capture/Compare/PWM module, 16-bit timer/counter, and 5 ADC channels for current sensing. The CCP module generates hardware PWM at up to 20 MHz / 2 resolution, which is sufficient for 10-bit PWM at moderate switching frequencies, while the ADC samples back-EMF or shunt current for closed-loop regulation. Placed between an H-bridge driver and a position sensor, it replaces a dedicated motor-control ASIC with a programmable MCU; the trade-off is firmware complexity versus ASIC BOM savings.
Được đề xuất
Consumer Appliance User Interface
The PIC16F818-E/SO fits consumer appliance UI boards because its 16 I/O pins drive LED indicators, button matrices, and rotary encoders, while the SSP peripheral talks to a host display or main controller. The extended -E temperature grade lets the same part serve refrigerator, oven, and HVAC peripherals without re-sourcing. Placed near a keypad and 7-segment display, it scans inputs and outputs while the host handles heavier graphics; compared to a 32-bit Cortex-M0, the PIC16F818-E/SO delivers adequate throughput at 30-50% lower unit cost.
Được đề xuất
HVAC Control Peripheral
The PIC16F818-E/SO suits HVAC control peripherals - damper actuators, zone sensors, and smart thermostat sub-boards - because the 5 ADC channels read thermistor bridges, the SSP drives SPI displays, and the -40 °C to +125 °C temperature range handles plenum environments. Brown-out Reset and Power-on Reset ensure clean starts under noisy HVAC rails. Placed between thermistor networks and a 4-20 mA loop driver, it digitizes setpoints; the trade-off versus a dedicated HVAC ASIC is software flexibility versus deterministic ASIC guarantees.
Được đề xuất
Security System Peripheral
The PIC16F818-E/SO fits PIR sensor modules, door-contact transmitters, and glass-break detectors because its low sleep current extends battery life, the EEPROM stores tamper flags and zone IDs, and the SSP supports encrypted RF transceivers. The extended -E temperature grade lets outdoor-rated sensors share a single part number. Placed between a pyroelectric sensor and an RF link, it filters spurious triggers and packs the alarm payload; the MCU's 20 MHz core is fast enough for rolling-code encryption firmware in security peripherals.
Được đề xuất
Small IoT Edge Node
The PIC16F818-E/SO is useful for simple IoT edge nodes reporting via SPI or I²C peripherals to a wireless module, where its 20 MHz core handles sensor pre-processing, ADC, and packet framing. The internal 8 MHz oscillator avoids external crystals, and the -E temperature grade fits outdoor enclosures. Placed between an environmental sensor and an SPI-attached LoRa or BLE module, it bridges analog sensor world to wireless data packets; the trade-off versus 32-bit Cortex-M0 alternatives is lower throughput but easier software development in the MPLAB X IDE with XC8.
Được đề xuất
Tóm tắt các sản phẩm được đề xuất
Dữ liệu tham khảo kỹ thuật cho PIC16F818-E/SO — 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/SO | PIC16F819-I/SO | PIC16F818-E/P | PIC16F818-E/SS | PIC16F818-E/ML |
|---|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 18-SOIC (7.5 mm width) | 18-SOIC (7.5 mm width) - same | 18-SOIC (7.5 mm width) - same | 18-PDIP - different (thru-hole) | 20-SSOP - different footprint | 28-QFN - different footprint |
| Flash Program Memory | 1.75 KB | 1.75 KB - same | 3.5 KB (+100%) | 1.75 KB - same | 1.75 KB - same | 1.75 KB - same |
| CPU Speed | 20 MHz | 20 MHz - same | 20 MHz - same | 20 MHz - same | 20 MHz - same | 20 MHz - same |
| Operating Temperature | -40 °C to +125 °C (Extended) | -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 +125 °C (Extended) |
| I/O Pins | 16 | 16 - same | 16 - same | 16 - same | 16 - same | 16 - same |
| ADC Channels | 5 x 10-bit | 5 x 10-bit - same | 5 x 10-bit - same | 5 x 10-bit - same | 5 x 10-bit - same | 5 x 10-bit - same |
| Internal Oscillator | 8 MHz | 8 MHz - same | 8 MHz - same | 8 MHz - same | 8 MHz - same | 8 MHz - same |
| EEPROM | 128 bytes | 128 bytes - same | 128 bytes - same | 128 bytes - same | 128 bytes - same | 128 bytes - same |
Bảo phân biệt quan trọng
- Extended temperature grade -40 °C to +125 °C on the same silicon (vsPIC16F818-I/SO)
- Double the Flash when more code is required (vsPIC16F819-I/SO)
- Wide-body SOIC for hand-prototyping ease (vsPIC16F818-E/SS (SSOP-20))
- Lower-cost thru-hole alternative (vsPIC16F818-E/P (PDIP-18))
Ghi chú thiết kế
Place a 100 nF decoupling capacitor within 5 mm of the VDD pin and a bulk-foil alternative on the analog AVdd rail when the ADC is active. The PIC16F818/819 datasheet recommends separate analog and digital ground returns tied at a single star point to minimize ADC noise coupling. In battery-powered designs use the nanoWatt sleep modes (Sleep instruction + watchdog disable) to achieve quiescent currents in the low-microamp range for multi-year battery life.
Avoid routing high-current traces adjacent to the analog AVss/AVdd pair or the analog input pins RA0-RA4 to preserve ADC accuracy. Keep the MTR ribbon on the wide SOIC layout at least 3 mm away from switching converter inductors. The 18-SOIC package has 1.27 mm pin pitch which simplifies breadboard and hand-solder prototypes compared to finer-pitch QFN alternatives; however, the wide 7.5 mm body consumes more PCB area than the SSOP or QFN variants.
The MTR pin requires a 10 kohm pull-up to VDD and must not be left floating, or the MCU will see spurious resets. The CONFIG word must set the oscillator mode (INTOSC for internal 8 MHz, HS for high-speed crystal) before the first instruction executes, otherwise the part will fail to start. Brown-out Reset (BOR) should be enabled via CONFIG for industrial deployments where Vdd may droop below the 4.0 V BOR threshold.
The I²C bus on the SSP peripheral requires external pull-up resistors (typically 4.7 kohm at 100 kHz or 2.2 kohm at 400 kHz) on SCL and SDA lines - the PIC16F818 SSP block has open-drain outputs that cannot drive the bus high. For SPI master mode, the SCL pin becomes SCK and the SSP block supports mode 0-3 with clock rates up to Fosc/4 (5 MHz at 20 MHz CPU).
Thông tin tuân thủ
RoHS compliant per Microchip product page; not AEC-Q100 qualified - choose PIC16F818 automotive variants for automotive applications.
