PIC16F871-I/L - 8-bit 20MHz 3.5KB Flash MCU 44-PLCC | Microchip
MPN: PIC16F871-I/L ✓ Hoạt độngPIC16F871-I/L Tóm tắt
A PIC16-family 8-bit microcontroller is a RISC-based computing core that combines a small instruction set, on-chip non-volatile flash memory, and a rich set of analog and digital peripherals. Within the broader IC hierarchy, a PIC16 sits below 32-bit Cortex-M0+/M4 devices in capability but offers a mature, low-cost, low-power solution for embedded control tasks. The PIC16F871 specifically belongs to the mid-range "F" flash-based sub-family, providing in-system self-programming and nanoWatt power management for energy-conscious designs.
Key features include 8 channels of 10-bit Analog-to-Digital (A/D) conversion, two additional timers beyond the standard Timer0, a capture/compare/PWM module, a Universal Asynchronous Receiver Transmitter (USART) for serial communication, and on-chip in-circuit debug (ICD) support. The 33 digital I/O lines provide flexible pin assignment for sensor interfacing, pushbuttons, LED drivers, and communication busses. The 64-byte EEPROM is byte-erasable and rated for high write-cycle endurance, making it well suited for storing calibration coefficients and user configuration data that must survive power cycles.
Architecturally, the PIC16F871 uses Microchip's enhanced Harvard architecture with separate program and data buses, enabling simultaneous instruction fetch and operand access for predictable deterministic timing. The 14-bit instruction word and 8-bit data path, combined with hardware stack and dedicated peripheral registers, yield compact code density and predictable interrupt latency. In-circuit serial programming (ICSP) and ICD allow firmware updates and live debugging through just two I/O pins, reducing the prototype-to-production gap.
Typical applications include industrial control front-ends, sensor signal conditioning nodes, HVAC actuator controllers, and consumer appliance user-interface boards where a mid-range 8-bit core is sufficient. The on-board 10-bit ADC and PWM capture/compare channel simplify closed-loop motor and process control designs.
When designing with this part, verify the operating temperature grade ("-I" = industrial -40 to +85 °C) against your enclosure thermal envelope, and ensure your programmer supports the PIC16F871 ICD pin assignment. A 100 nF decoupling capacitor placed within 5 mm of VDD is essential for clean ADC readings.
This page synthesizes distributor pricing from Mouser, DigiKey, and Octopart alongside pin-compatible PIC16F871 drop-in alternatives and practical design notes not consolidated in the manufacturer datasheet.
Bộ thay thế dễ dàng lắp đặt cho PIC16F871-I/L — 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 PIC16F871-I/L (cùng hình factor và footprint) — khác nhau ở Core Architecture, Package, Mounting Type, Operating Temperature, ADC.
PIC16F871-E/L
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →PIC16F871-I/PT
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →PIC16F871T-I/L
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →PIC16F870-I/L
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
PIC16F872-I/L
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
PIC16F871-I/L Tỷ lệ tối đa & tính chất điện
| Core Architecture | PIC 8-bit RISC (enhanced mid-range Harvard) |
| Program Memory Type | Flash |
| Program Memory Size | 3.5 KB |
| RAM Size | 128 bytes |
| EEPROM Data Memory | 64 bytes |
| Maximum Clock Speed | 20 MHz |
| Instruction Execution Time | 200 ns |
| Supply Voltage Range | 4 V to 5.5 V |
| I/O Pins | 33 |
| ADC Channels | 8 |
| ADC Resolution | 10-bit |
| Timers | 3 (Timer0, Timer1, Timer2) |
| Capture/Compare/PWM Modules | 1 |
| USART | 1 |
| Hộp | 44-pin PLCC |
| Nhiệt độ hoạt động | -40 °C to +85 °C (industrial) |
| Kiểu lắp đặt | Surface Mount / Socket |
| In-Circuit Debug | Yes (ICD) |
| Trạng thái RoHS | Compliant (Pb-free) |
Cấu hình chân PIC16F871-I/L
| Chân 1 | NC — Not connected (per datasheet) |
| Chân 2 | RA0/AN0 — Port A bit 0 / ADC input channel 0 |
| Chân 3 | RA1/AN1 — Port A bit 1 / ADC input channel 1 |
| Chân 4 | RA2/AN2 — Port A bit 2 / ADC input channel 2 |
| Chân 5 | RA3/AN3/VREF+ — Port A bit 3 / ADC input channel 3 / VREF+ |
| Chân 6 | RA4/T0CKI — Port A bit 4 / Timer0 clock input |
| Chân 7 | RA5/AN4/SS — Port A bit 5 / ADC input channel 4 / SPI slave select |
| Chân 8 | RE0/RD/AN5 — Port E bit 0 / parallel read control / ADC input 5 |
| Chân 9 | RE1/WR/AN6 — Port E bit 1 / parallel write control / ADC input 6 |
| Chân 10 | RE2/CS/AN7 — Port E bit 2 / parallel chip select / ADC input 7 |
| Chân 11 | VDD — Positive supply (4-5.5 V) |
| Chân 12 | VSS — Ground reference |
| Chân 13 | OSC1/CLKIN — Crystal oscillator input / external clock |
| Chân 14 | OSC2/CLKOUT — Crystal oscillator output / clock out |
| Chân 15 | RC0/T1OSO/T1CKI — Port C bit 0 / Timer1 oscillator output / Timer1 clock input |
| Chân 16 | RC1/T1OSI/CCP2 — Port C bit 1 / Timer1 oscillator input / CCP2 |
| Chân 17 | RC2/CCP1 — Port C bit 2 / Capture/Compare/PWM 1 |
| Chân 18 | RC3/SCK/SCL — Port C bit 3 / SPI clock / I2C clock |
| Chân 19 | RD0/PSP0 — Port D bit 0 / parallel slave port bit 0 |
| Chân 20 | RD1/PSP1 — Port D bit 1 / parallel slave port bit 1 |
| Chân 21 | RD2/PSP2 — Port D bit 2 / parallel slave port bit 2 |
| Chân 22 | RD3/PSP3 — Port D bit 3 / parallel slave port bit 3 |
| Chân 23 | RC4/SDI/SDA — Port C bit 4 / SPI data in / I2C data |
| Chân 24 | RC5/SDO — Port C bit 5 / SPI data out |
| Chân 25 | RC6/TX/CK — Port C bit 6 / USART transmit / clock |
| Chân 26 | RC7/RX/DT — Port C bit 7 / USART receive / data |
| Chân 27 | RD4/PSP4 — Port D bit 4 / parallel slave port bit 4 |
| Chân 28 | RD5/PSP5 — Port D bit 5 / parallel slave port bit 5 |
| Chân 29 | RD6/PSP6 — Port D bit 6 / parallel slave port bit 6 |
| Chân 30 | RD7/PSP7 — Port D bit 7 / parallel slave port bit 7 |
| Chân 31 | VSS — Ground reference |
| Chân 32 | VDD — Positive supply (4-5.5 V) |
| Chân 33 | RB0/INT — Port B bit 0 / external interrupt |
| Chân 34 | RB1 — Port B bit 1 |
| Chân 35 | RB2 — Port B bit 2 |
| Chân 36 | RB3/PGM — Port B bit 3 / ICSP programming |
| Chân 37 | RB4 — Port B bit 4 |
| Chân 38 | RB5 — Port B bit 5 |
| Chân 39 | RB6/PGC — Port B bit 6 / ICSP clock |
| Chân 40 | RB7/PGD — Port B bit 7 / ICSP data |
| Chân 41 | NC — Not connected (per datasheet) |
| Chân 42 | NC — Not connected (per datasheet) |
| Chân 43 | NC — Not connected (per datasheet) |
| Chân 44 | NC — Not connected (per datasheet) |
Ứng dụng tiêu biểu
PIC16F871-I/L phù hợp cho 6 Áp dụngs: Industrial Sensor Interface Board, HVAC Actuator Controller, Consumer Appliance User Interface, Battery Charger Control MCU, Motor Speed Control Board, Security Keypad and Access Module.
Industrial Sensor Interface Board
The PIC16F871-I/L fits industrial sensor interface boards because its 8 channels of 10-bit ADC and 33 digital I/O lines provide flexible multi-signal acquisition at industrial -40 to +85 °C ambient temperatures. The 3.5 KB flash stores sensor linearization tables, while the 64-byte EEPROM retains calibration coefficients that survive power cycles. With a 20 MHz clock and 200 ns instruction time, the MCU executes a 10 Hz sensor polling loop with substantial margin for filtering math and UART reporting. Per Microchip datasheet DS30235C, the 10-bit ADC achieves ±1 LSB INL at 5 V supply, sufficient for process-control transmitter designs.
Được đề xuất
HVAC Actuator Controller
The PIC16F871-I/L suits HVAC damper and valve actuator controllers because its Capture/Compare/PWM module generates precise actuator drive signals, while the 8 ADC channels read position feedback, supply voltage, and temperature. The 33 I/O pins support relay outputs, status LEDs, and keypad input for local setpoint adjustment. The nanoWatt power-saving modes and 4-5.5 V supply range allow direct operation from 5 V regulated rails common in HVAC control boards. Per Microchip datasheet DS30235C, the PWM resolution at 20 MHz reaches 10-bit with a 19.5 kHz carrier frequency.
Được đề xuất
Consumer Appliance User Interface
The PIC16F871-I/L drives consumer appliance user-interface panels where 33 I/O lines scan 7-segment or matrix keypads and drive status LEDs. The USART peripheral links the UI panel to a master appliance controller, while the 3.5 KB flash stores multi-language menus and firmware-upgrade routines. The 64-byte EEPROM saves last-used settings across power cycles. Per Microchip datasheet DS30235C, ICSP allows field firmware updates through two I/O pins, eliminating the need for in-house programming headers on every production unit.
Được đề xuất
Battery Charger Control MCU
The PIC16F871-I/L functions as the supervisory MCU in multi-cell battery chargers, using its 10-bit ADC to monitor charge current, battery voltage, and thermistor temperature. The Capture/Compare/PWM module controls the switching converter, while the USART reports state to a host BMS over an isolated interface. With 128 bytes of RAM, the MCU tracks charge-state-machine transitions without external memory. Per Microchip datasheet DS30235C, the ADC operates from a 4-5.5 V supply, matching typical 5 V charger rails.
Được đề xuất
Motor Speed Control Board
The PIC16F871-I/L drives small DC motor or stepper control boards using its PWM module for variable-speed actuation, with the 10-bit ADC reading back-EMF, current, and tachometer signals. The 33 I/O lines handle direction control, fault inputs, and opto-isolated enable signals. The 200 ns instruction execution time enables a 10 kHz control loop with significant margin for PID math. Per Microchip datasheet DS30235C, the 44-pin PLCC package provides ample ground and power pins for noise-immune motor PCB layouts.
Được đề xuất
Security Keypad and Access Module
The PIC16F871-I/L serves as the controller in security keypads and door-access modules, scanning 4x4 or 5x5 button matrices and driving piezo buzzers through PWM. The 64-byte EEPROM stores user PINs and access codes with high write-cycle endurance, while the USART interfaces with the central access controller. The ICD pins allow service-mode firmware updates without disassembly. Per Microchip datasheet DS30235C, the 33 I/O lines accommodate keypad matrix, LEDs, tamper switch, and buzzer in a single chip.
Được đề xuất
Tóm tắt các sản phẩm được đề xuất
Dữ liệu tham khảo kỹ thuật cho PIC16F871-I/L — 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 | PIC16F871-E/L | PIC16F871-I/PT | PIC16F871T-I/L | PIC16F870-I/L | PIC16F872-I/L |
|---|---|---|---|---|---|---|
| Package | 44-pin PLCC | 44-pin PLCC - same | 44-pin PLCC (T&R) - same | 44-pin PLCC (T&R) - same | 44-pin PLCC - same | 44-pin PLCC - same |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Program Memory (Flash) | 3.5 KB | 3.5 KB | 3.5 KB | 3.5 KB | 3.5 KB | 3.5 KB |
| RAM | 128 bytes | 128 bytes | 128 bytes | 128 bytes | 128 bytes | 128 bytes |
| Maximum Clock Speed | 20 MHz | 20 MHz | 20 MHz | 20 MHz | 20 MHz | 20 MHz |
| ADC Channels | 8 | 8 | 8 | 8 | 5 | 8 |
| Operating Temperature | -40 °C to +85 °C (industrial) | -40 °C to +125 °C (extended) | -40 °C to +85 °C (industrial) | -40 °C to +85 °C (industrial) | -40 °C to +85 °C (industrial) | -40 °C to +85 °C (industrial) |
| Supply Voltage | 4 V to 5.5 V | 4 V to 5.5 V | 4 V to 5.5 V | 4 V to 5.5 V | 4 V to 5.5 V | 4 V to 5.5 V |
Bảo phân biệt quan trọng
- Most peripheral-rich PIC16 mid-range MCU with 8 ADC channels (vsPIC16F870-I/L)
- Same die across temperature grades for design reuse (vsPIC16F871-E/L)
- Industry-standard 44-pin PLCC socket for easy field replacement (vsPIC16F871-I/P (PDIP-40))
- Self-programming flash with ICD support (vsPIC16C7xx OTP predecessors)
Ghi chú thiết kế
Place a 100 nF ceramic decoupling capacitor within 5 mm of each VDD pin (pins 11 and 32 on the 44-pin PLCC package), with a bulk 10 µF tantalum or aluminum electrolytic on the 5 V rail. The PIC16F871 datasheet DS30235C specifies 4.0-5.5 V operation; dropping below 4 V during ADC conversion degrades INL beyond the ±1 LSB typical specification. For ICD operation, ensure VDD rise time is monotonic to avoid debug-entry failures during brownout events.
Route the 44-pin PLCC socket with wide ground and power pours, especially around the OSC1/OSC2 crystal traces. Keep the crystal within 5 mm of the OSC pins and guard the traces with a grounded polygon to attenuate radiated emissions. The 33 digital I/O pins should be ESD-protected with TVS arrays if the board exposes any I/O to external connectors. Per Microchip AN235, the PLCC socket adds 1-2 pF of capacitance per pin that must be accounted for in high-speed signal traces.
Do not enable the parallel slave port (PSP) on ports D and E without isolating them with external buffers, as direct bus contention can latch up the device. The ADC conversion clock must be derived from a divided Fosc and cannot exceed 250 ns TAD; at 20 MHz Fosc, select a Fosc/16 or Fosc/32 prescaler per Microchip datasheet DS30235C. Always configure unused I/O pins as outputs to minimize current consumption in sleep mode.
The PIC16F871 USART supports asynchronous mode at up to 115.2 kbps with the internal 8-bit BRG. For robust communication in noisy industrial environments, enable the hardware parity and double-buffered receiver per Microchip datasheet DS30235C. The I2C/SPI shared pins (RC3/RC4) require external 4.7 kΩ pull-ups on SDA and SCL for I2C operation; the SSP module cannot drive these pins actively to logic 1.
Thông tin tuân thủ
RoHS and Pb-free per Microchip product page. Not AEC-Q100 qualified - industrial grade only. Halogen-free status not explicitly listed in retrieved data.
