PIC16F877AT-I/PTG - 8-bit 20MHz MCU 14KB Flash TQFP-44 | Microchip
MPN: PIC16F877AT-I/PTG ✓ Hoạt độngPIC16F877AT-I/PTG Tóm tắt
A microcontroller (MCU) is a single-chip computer containing a CPU, program memory (Flash/ROM), working memory (RAM), non-volatile data storage (EEPROM), and peripherals such as timers, ADC, communication ports, and I/O. The PIC16F87x family is part of Microchip's mid-range 8-bit MCU lineup, sitting in the hierarchy: PIC16F87x -> PIC16 mid-range -> 8-bit MCU -> microcontroller -> semiconductor IC. PIC MCUs use a Harvard architecture with separate program and data buses, RISC instruction set, and a 14-bit instruction word, which simplifies instruction decoding and enables deterministic throughput.
Key features of the PIC16F877AT-I/PTG include a 20 MHz maximum operating frequency, an integrated 10-bit multi-channel Analog-to-Digital Converter, two 8-bit timers and one 16-bit timer, a USART, MSSP (SPI/I2C), PSP parallel slave port, and brown-out reset (BOR). The wide operating voltage range of 2.0V to 5.5V (industrial -40C to +85C) supports both 3.3V and 5V designs. The device also supports in-circuit serial programming (ICSP) and in-circuit debugger (ICD) interfaces, enabling field firmware updates without removing the chip from the board.
Architecturally, the PIC16F877A employs a 14-bit instruction word, 8-level hardware stack, and 35 single-word instructions, which together produce compact assembly code and efficient high-level language compilation. The 25-year silicon heritage of this part has made it a reference design platform for educational institutions and legacy industrial systems worldwide.
Typical applications include industrial automation controllers, sensor interface front-ends, motor control driver boards, instrumentation and data acquisition, automotive body electronics, and educational prototyping boards. The combination of rich peripherals and breadboard-friendly TQFP package has made this device a workhorse for both hobbyist and professional designs.
When designing with this part, ensure decoupling capacitors (0.1 uF and 10 uF) are placed within 5 mm of the VDD pins. Use the ICSP connector footprint on every PCB layout even if in-system programming is not initially required - this preserves future firmware flexibility.
This page consolidates distributor pricing, drop-in alternatives, and practical engineering guidance that supplements - but does not replace - the manufacturer datasheet.
Bộ thay thế dễ dàng lắp đặt cho PIC16F877AT-I/PTG — 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 PIC16F877AT-I/PTG (cùng hình factor và footprint) — khác nhau ở Package, Timers, Operating Temperature, ADC, Program Memory (Flash).
PIC16F877A-I/PT
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →PIC16F877-20I/PT
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →PIC16F877A-E/PT
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →PIC16F874AT-I/PT
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →PIC18F4520-I/PT
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →PIC16F877AT-I/PTG Tỷ lệ tối đa & tính chất điện
| Core Architecture | PIC16, 8-bit RISC, 14-bit instruction word |
| Program Memory Type | Flash |
| Program Memory Size | 14 KB (8K x 14 words) |
| RAM | 368 bytes |
| EEPROM | 256 bytes |
| Maximum CPU Frequency | 20 MHz |
| Supply Voltage Range | 4.0 V to 5.5 V (4.5 V to 5.5 V for industrial per source) |
| Nhiệt độ hoạt động | -40 C to +85 C (Industrial, "I" grade) |
| Digital I/O Pins | 33 |
| ADC | 10-bit, 8 channels |
| Timers | Two 8-bit + One 16-bit (3 total) |
| Capture/Compare/PWM | 2 CCP modules |
| Communication | USART (SCI), MSSP (SPI / I2C), PSP |
| Hộp | 44-pin TQFP (MQFP-44), 10 x 10 mm, 2 mm height, MS-022 |
| Kiểu lắp đặt | Surface Mount |
| Packaging Type | Tape & Reel (suffix "G") |
| Cấp MSL | 3 (per typical Microchip TQFP-44 profile) |
| Lead-Free / RoHS | Lead Free / RoHS Compliant |
Cấu hình chân PIC16F877AT-I/PTG
| Chân 1 | MCLR#/VPP — Master Clear (active-low reset) / programming voltage input |
| 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/T0CKI — Digital I/O / Timer0 clock input |
| Chân 7 | RA5/AN4/SS# — Digital I/O / Analog input channel 4 / SPI slave select |
| Chân 8 | RE0/RD#/AN5 — Digital I/O / Parallel slave read strobe / Analog ch5 |
| Chân 9 | RE1/WR#/AN6 — Digital I/O / Parallel slave write strobe / Analog ch6 |
| Chân 10 | RE2/CS#/AN7 — Digital I/O / Parallel slave chip select / Analog ch7 |
| Chân 11 | VDD — Positive supply voltage |
| Chân 12 | VSS — Ground reference |
| Chân 13 | OSC1/CLKIN — Crystal oscillator input / external clock input |
| Chân 14 | OSC2/CLKOUT — Crystal oscillator output / clock output |
| Chân 15 | RC0/T1OSO/T1CKI — Digital I/O / Timer1 oscillator output / Timer1 clock |
| Chân 16 | RC1/T1OSI/CCP2 — Digital I/O / Timer1 oscillator input / CCP2 PWM |
| Chân 17 | RC2/CCP1 — Digital I/O / CCP1 PWM output |
| Chân 18 | RC3/SCK/SCL — Digital I/O / SPI clock / I2C clock |
| Chân 19 | RD0/PSP0 — Digital I/O / Parallel slave port data bit 0 |
| Chân 20 | RD1/PSP1 — Digital I/O / Parallel slave port data bit 1 |
| Chân 21 | RD2/PSP2 — Digital I/O / Parallel slave port data bit 2 |
| Chân 22 | RD3/PSP3 — Digital I/O / Parallel slave port data bit 3 |
| Chân 23 | RC4/SDI/SDA — Digital I/O / SPI data in / I2C data |
| Chân 24 | RC5/SDO — Digital I/O / SPI data out |
| Chân 25 | RC6/TX/CK — Digital I/O / USART transmit / USART clock |
| Chân 26 | RC7/RX/DT — Digital I/O / USART receive / USART data |
| Chân 27 | RD4/PSP4 — Digital I/O / Parallel slave port data bit 4 |
| Chân 28 | RD5/PSP5 — Digital I/O / Parallel slave port data bit 5 |
| Chân 29 | RD6/PSP6 — Digital I/O / Parallel slave port data bit 6 |
| Chân 30 | RD7/PSP7 — Digital I/O / Parallel slave port data bit 7 |
| Chân 31 | VSS — Ground reference |
| Chân 32 | VDD — Positive supply voltage |
| Chân 33 | RB0/INT — Digital I/O / External interrupt input |
| Chân 34 | RB1 — Digital I/O |
| Chân 35 | RB2 — Digital I/O |
| Chân 36 | RB3/PGM — Digital I/O / Low-voltage ICSP programming |
| Chân 37 | RB4 — Digital I/O / interrupt-on-change |
| Chân 38 | RB5 — Digital I/O / interrupt-on-change |
| Chân 39 | RB6/PGC — Digital I/O / ICSP clock / interrupt-on-change |
| Chân 40 | RB7/PGD — Digital I/O / ICSP data / interrupt-on-change |
| Chân 41 | NC — Not connected (no internal bond) |
| Chân 42 | NC — Not connected (no internal bond) |
| Chân 43 | NC — Not connected (no internal bond) |
| Chân 44 | NC — Not connected (no internal bond) |
Ứng dụng tiêu biểu
PIC16F877AT-I/PTG phù hợp cho 6 Áp dụngs: Industrial Automation Controller, Educational Development Board, Sensor Interface Front-End, Hobbyist Robotics Control, Automotive Body Electronics, Data Acquisition Module.
Industrial Automation Controller
The PIC16F877AT-I/PTG fits industrial automation controllers through its 33 digital I/O and 20 MHz 5 MIPS core, which drive relay banks, optocoupler inputs, and 4-20 mA loops. Its 10-bit ADC samples analog sensor feedback (pressure, flow, temperature) at 19.5 us per channel. The industrial -40 C to +85 C temperature range tolerates factory-floor thermal stress without active cooling.
Được đề xuất
Educational Development Board
The PIC16F877AT-I/PTG is a staple of university microcontroller courses due to its comprehensive peripheral set in a breadboard-compatible TQFP-44 carrier. Students gain hands-on experience with the 10-bit ADC, two CCP PWM outputs, USART, and I2C/SPI bus. The 14 KB Flash fits full midterm projects including keypad scanning, LCD control, and serial communication stacks.
Được đề xuất
Sensor Interface Front-End
The PIC16F877AT-I/PTG is widely deployed as a sensor hub that aggregates analog and digital signals into a serial datastream. Its 8-channel ADC multiplexes thermocouples, RTDs, and strain gauges; the USART pushes processed readings to a host controller. Hardware I2C/SPI peripherals connect directly to MEMS accelerometers, pressure sensors, and digital temperature ICs without bit-banging.
Được đề xuất
Hobbyist Robotics Control
The PIC16F877AT-I/PTG suits small robotics platforms where its two CCP modules generate complementary PWM for driving half-bridge motor drivers. The 20 MHz core handles line-following, obstacle avoidance, and PID control loops in real time. Hobbyists value the extensive legacy code base, free MPLAB X IDE, and large community of PIC16F877A example projects available online.
Được đề xuất
Automotive Body Electronics
The PIC16F877AT-I/PTG is deployed in non-safety automotive body modules such as HVAC blend-door actuators and lighting controllers. Its 33 I/O lines interface directly with switch panels and LED drivers; the 10-bit ADC monitors thermistor inputs. Per Microchip automotive-grade guidance, AEC-Q100 qualified variants (PIC16F877A-I/PT automotive screening) are required for OEM production.
Được đề xuất
Data Acquisition Module
The PIC16F877AT-I/PTG functions as a compact multi-channel data logger, leveraging its 8-channel 10-bit ADC, USART, and I2C bus to record process variables. The 256-byte EEPROM stores calibration coefficients and sample timestamps, while 368 bytes of RAM buffer A/D bursts before serial transmission. Battery-powered deployments benefit from the device's deep-sleep current of less than 1 uA.
Được đề xuất
Tóm tắt các sản phẩm được đề xuất
Dữ liệu tham khảo kỹ thuật cho PIC16F877AT-I/PTG — 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 | PIC16F877A-I/PT | PIC16F877-20I/PT | PIC16F877A-E/PT | PIC16F874AT-I/PT | PIC18F4520-I/PT |
|---|---|---|---|---|---|---|
| Package | 44-pin TQFP (PT) 10x10 mm | 44-pin TQFP (PT) - same | 44-pin TQFP (PT) - same | 44-pin TQFP (PT) - same | 44-pin TQFP (PT) - same | 44-pin TQFP (PT) - same |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Core | PIC16 8-bit, 14-bit instruction, 20 MHz | PIC16 8-bit, 14-bit, 20 MHz | PIC16 8-bit, 14-bit, 20 MHz | PIC16 8-bit, 14-bit, 20 MHz | PIC16 8-bit, 14-bit, 20 MHz | PIC18 8-bit, 16-bit instruction, 40 MHz |
| Flash Memory | 14 KB | 14 KB | 14 KB | 14 KB | 7 KB (-50%) | 32 KB (+129%) |
| RAM | 368 bytes | 368 bytes | 368 bytes | 368 bytes | 192 bytes (-48%) | 1536 bytes (+317%) |
| Digital I/O | 33 | 33 | 33 | 33 | 33 | 36 |
| ADC | 10-bit, 8 channels | 10-bit, 8 channels | 10-bit, 8 channels | 10-bit, 8 channels | 10-bit, 8 channels | 10-bit, 13 channels |
| Operating Temperature | -40 C to +85 C (Industrial "I") | -40 C to +85 C | -40 C to +85 C | -40 C to +125 C (Extended) | -40 C to +85 C | -40 C to +85 C |
| Supply Voltage | 4.0 V to 5.5 V | 4.0 V to 5.5 V | 4.0 V to 5.5 V | 4.0 V to 5.5 V | 4.0 V to 5.5 V | 4.2 V to 5.5 V |
| Q1-1 Price (USD) | 9.20 | 8.85 | 8.10 | 9.40 | 8.95 | 7.60 |
Bảo phân biệt quan trọng
- Lower operating voltage range than PIC18F4520-I/PT (vsPIC18F4520-I/PT)
- Full 14 KB Flash memory at lower price point than PIC16F877A-E/PT (vsPIC16F877A-E/PT)
- More Flash than PIC16F874AT-I/PT (vsPIC16F874AT-I/PT)
Ghi chú thiết kế
Place a 0.1 uF ceramic decoupling capacitor within 5 mm of each VDD pin (pins 11 and 32) and a single 10 uF bulk tantalum or ceramic capacitor at the board power entry. The PIC16F877AT-I/PTG draws up to 35 mA at 20 MHz with all peripherals active; ensure the 5 V regulator has at least 100 mA headroom. Use a ferrite bead on AVDD if analog noise from digital switching affects ADC readings.
Route the ICSP signals PGC (RB6) and PGD (RB7) on the top copper layer straight to a 6-pin header footprint - never place series resistors on these lines. Keep crystal traces (OSC1/OSC2) short and guarded by a ground pour to minimize EMI pickup. For TQFP-44, use 0.20 mm trace/space with 0.25 mm via-in-pad if board density requires it; otherwise 0.30 mm is sufficient for 5 V signals.
Never tie MCLR# directly to VDD without a 10 kohm pull-up and a 100 nF decoupling cap; otherwise the part will reset randomly in noisy environments. Do not exceed the Flash endurance rating of 100 K erase/write cycles - implement wear-leveling in EEPROM emulation if frequent writes are needed. When using the internal ADC, set the A/D acquisition time to at least 19.5 us or sample accuracy will degrade.
Thông tin tuân thủ
RoHS compliant per Microchip product page. Standard industrial-grade; for AEC-Q100 automotive qualification use the PIC16F877AT-I/PT automotive screening variant - not the -I/PTG suffix used here.
