PIC16LF877A-I/PT - 8-Bit 10MHz MCU, 14KB Flash, 44-TQFP | Microchip
MPN: PIC16LF877A-I/PT ✓ Hoạt độngPIC16LF877A-I/PT Tóm tắt
An 8-bit microcontroller (MCU) is a single-chip computer that combines a CPU, program memory, data memory, and a curated set of peripherals on one die; in the broader taxonomy it sits under microcontroller -> embedded processor -> semiconductor. The PIC16F family pioneered Harvard-architecture 8-bit MCUs with RISC-like single-word instructions and was the workhorse platform for thousands of hobbyist, industrial, and educational designs.
Key features of the PIC16LF877A-I/PT include 33 digital I/O pins, three timers (Timer0 8-bit, Timer1 16-bit, Timer2 8-bit), two Capture/Compare/PWM modules, an 8-channel 10-bit Analog-to-Digital Converter, two analog comparators, a synchronous serial port configurable as SPI or I2C, a USART with addressable RS-485 mode, a parallel slave port, and brown-out reset plus power-on reset.
Architecturally the device pairs a 14-bit instruction word Flash with a 35-instruction core, an 8-bit data path, and a high-current sink/source capability on port pins (25mA per pin typical) that lets it drive LEDs and small relays directly. The LF process node trades absolute speed for lower VDD operation, retaining full peripheral compatibility with the F-version.
Typical applications include industrial sensor interfaces, low-power data loggers, hobbyist robotics, automotive body controllers and aftermarket gauges, educational development platforms, and legacy embedded systems that need to retain a PIC16 footprint while modernising firmware. The 44-TQFP footprint also remains pin-compatible with several successors in the PIC18 family.
When designing with the LF variant, remember that the 10MHz rating is at 5V; at 3.3V the maximum is typically 4MHz and the oscillator modes must be reconfigured. Always place decoupling capacitors (100nF ceramic) close to VDD/VSS pairs and route MCLR through a 10k pull-up unless in-circuit debugging is enabled.
Bộ thay thế dễ dàng lắp đặt cho PIC16LF877A-I/PT — 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 PIC16LF877A-I/PT (cùng hình factor và footprint) — khác nhau ở Package, Serial Interfaces, Mounting Type, Operating Temperature, Timers.
PIC16F877A-I/PT
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →PIC16LF874A-I/PT
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
PIC16F887-I/PT
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →PIC16LF877A-I/P
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →PIC16LF877A-I/PT Tỷ lệ tối đa & tính chất điện
| Core | PIC16 enhanced mid-range 8-bit |
| Instruction Set | 35 single-word instructions, 14-bit word |
| Program Memory (Flash) | 14 KB (8K x 14 words) |
| Data SRAM | 368 bytes |
| Data EEPROM | 256 bytes |
| Maximum CPU Speed | 10 MHz / 200 ns instruction cycle |
| Operating Voltage (VDD) | 2.0 V to 5.5 V |
| Digital I/O Pins | 33 |
| Analog Inputs (ADC) | 8 channels, 10-bit |
| Timers | 3 (Timer0 8-bit, Timer1 16-bit, Timer2 8-bit) |
| Capture/Compare/PWM | 2 CCP modules |
| Serial Interfaces | MSSP (SPI / I2C), USART with RS-485 addressing |
| Analog Comparators | 2 |
| Parallel Slave Port | Yes (PORTD) |
| Hộp | 44-pin TQFP (PT), 10 x 10 mm |
| Kiểu lắp đặt | Surface Mount |
| Nhiệt độ hoạt động | -40 C to +85 C (industrial) |
| I/O Sink/Source | 25 mA per pin (typical) |
| Cấp MSL | 3 (168 hours) |
| Trạng thái RoHS | Compliant |
Cấu hình chân PIC16LF877A-I/PT
| Chân 1 | MCLR/VPP — Master Clear (reset, active low) / programming voltage input |
| Chân 2 | RA0/AN0 — Digital I/O / analog input 0 |
| Chân 3 | RA1/AN1 — Digital I/O / analog input 1 |
| Chân 4 | RA2/AN2/VREF- — Digital I/O / analog input 2 / ADC VREF- |
| Chân 5 | RA3/AN3/VREF+ — Digital I/O / analog input 3 / ADC VREF+ |
| Chân 6 | RA4/T0CKI — Digital I/O / Timer0 clock input |
| Chân 7 | RA5/AN4/SS — Digital I/O / analog input 4 / SPI slave select |
| Chân 8 | RE0/RD/AN5 — Digital I/O / parallel slave port read / analog input 5 |
| Chân 9 | RE1/WR/AN6 — Digital I/O / parallel slave port write / analog input 6 |
| Chân 10 | RE2/CS/AN7 — Digital I/O / parallel slave port CS / analog input 7 |
| Chân 11 | VDD — Positive supply (2.0V to 5.5V) |
| Chân 12 | VSS — Ground |
| Chân 13 | OSC1/CLKI — Crystal/oscillator input |
| Chân 14 | OSC2/CLKO — Crystal/oscillator output |
| Chân 15 | RC0/T1OSO/T1CKI — Digital I/O / Timer1 oscillator output / clock input |
| Chân 16 | RC1/T1OSI/CCP2 — Digital I/O / Timer1 oscillator input / CCP2 |
| Chân 17 | RC2/CCP1 — Digital I/O / CCP1 |
| Chân 18 | RC3/SCK/SCL — Digital I/O / SPI SCK / I2C SCL |
| Chân 19 | RD0/PSP0 — Digital I/O / parallel slave port data 0 |
| Chân 20 | RD1/PSP1 — Digital I/O / parallel slave port data 1 |
| Chân 21 | RD2/PSP2 — Digital I/O / parallel slave port data 2 |
| Chân 22 | RD3/PSP3 — Digital I/O / parallel slave port data 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 TX / clock |
| Chân 26 | RC7/RX/DT — Digital I/O / USART RX / data |
| Chân 27 | RD4/PSP4 — Digital I/O / parallel slave port data 4 |
| Chân 28 | RD5/PSP5 — Digital I/O / parallel slave port data 5 |
| Chân 29 | RD6/PSP6 — Digital I/O / parallel slave port data 6 |
| Chân 30 | RD7/PSP7 — Digital I/O / parallel slave port data 7 |
| Chân 31 | VSS — Ground |
| Chân 32 | VDD — Positive supply (2.0V to 5.5V) |
| Chân 33 | RB0/INT — Digital I/O / external interrupt |
| Chân 34 | RB1 — Digital I/O |
| Chân 35 | RB2 — Digital I/O |
| Chân 36 | RB3/PGM — Digital I/O / LVP programming entry |
| Chân 37 | RB4 — Digital I/O |
| Chân 38 | RB5 — Digital I/O |
| Chân 39 | RB6/PGC — Digital I/O / ICSP clock |
| Chân 40 | RB7/PGD — Digital I/O / 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
PIC16LF877A-I/PT phù hợp cho 7 Áp dụngs: Industrial Sensor Interface, Low-Power Data Logger, Hobbyist Robotics Controller, Automotive Aftermarket Gauges, Educational Development Platform, White Goods and Appliance Control, Legacy Industrial PLC I/O Modules.
Industrial Sensor Interface
The PIC16LF877A-I/PT is well matched to industrial sensor interface boards thanks to its 8-channel 10-bit ADC, 2.0-5.5V supply tolerance, and 25mA sink/source on PORTB and PORTD that can directly drive optocouplers or small relays. With 14KB Flash and 368B SRAM the MCU has comfortable headroom for Modbus RTU framing, calibration tables and linearisation. The LF variant also runs from 24V industrial rails stepped down to 3.3V, while the USART supports RS-485 addressing natively. Reference design: Microchip AN1078 sensor conditioning board.
Được đề xuất
Low-Power Data Logger
Battery-powered data loggers benefit from the LF variant's 2.0V minimum VDD, allowing direct 2xAA operation with no boost regulator. Sleep current drops to roughly 1uA with the watchdog timer running, while 256 bytes of EEPROM provides parameter storage without external FRAM. With 14KB Flash the firmware can implement block-erase wear-levelling and a FAT-like filesystem for SD card logging. The 33 I/O pins also expose an I2C bus for a DS3231 RTC and SPI for a microSD breakout. Reference design: Microchip AN1154 battery management code.
Được đề xuất
Hobbyist Robotics Controller
Hobbyist robotics remains the PIC16LF877A-I/PT's signature use case thanks to its dual CCP modules for servo/quadrature decoding, MSSP for SPI gyros and USART for Bluetooth serial. The 10MHz core is sufficient for 50Hz servo loops with PID math, and 33 I/O pins drive 16 servos, an H-bridge and an OLED. PICkit 3 and MPLAB X provide free toolchain support and ICSP programming, while a 20MHz crystal variant of the F877A can be dropped in when extra headroom is needed.
Được đề xuất
Automotive Aftermarket Gauges
Automotive aftermarket boost, oil pressure and wideband gauges use the PIC16LF877A-I/PT to read 0-5V analog sensors, drive 7-segment LED clusters via PORTD directly, and communicate on CAN through an external MCP2515. The 2.0-5.5V supply range survives cold-crank down to 6V alternators, while brown-out reset protects EEPROM parameters. Industrial -40 to +85C screening covers the cabin environment and most engine-bay installs where the gauge is mounted remotely.
Được đề xuất
Educational Development Platform
Universities and technical colleges continue to specify the PIC16LF877A-I/PT for embedded systems courses because the 35-instruction RISC core fits on a single-page cheat sheet and the 44-TQFP footprint allows hand-soldered prototyping. The 14KB Flash is large enough for term projects including FAT, USB stacks and basic graphics, while ICSP debugging lets students step through code without specialised emulators. The same part family is also used in Arduino-shield PIC clone boards, providing familiarity.
Được đề xuất
White Goods and Appliance Control
White goods controllers (washing machines, dishwashers, induction hobs) historically used PIC16F877A and continue to use PIC16LF877A-I/PT for cost-sensitive product lines. The 25mA I/O drives triac optocouplers and relay coils directly, the 8-channel ADC reads NTC temperature sensors, and the USART links to a user-interface board. The 256-byte EEPROM stores calibration and last-cycle state, and 14KB Flash supports the IEC 60730 class B self-test library from Microchip.
Được đề xuất
Legacy Industrial PLC I/O Modules
Drop-in 44-TQFP footprint and 33 I/O make PIC16LF877A-I/PT a popular retrofit for older discrete-logic I/O modules that need a CPU for diagnostics and Modbus. The MSSP provides isolated I2C to 24V digital input boards, while the parallel slave port offloads burst reads from a host PLC. Industrial -40 to +85C screening and long-term Microchip supply continuity are key benefits for plant operators unwilling to redesign.
Được đề xuất
Tóm tắt các sản phẩm được đề xuất
Dữ liệu tham khảo kỹ thuật cho PIC16LF877A-I/PT — 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 | PIC16LF874A-I/PT | PIC16F887-I/PT | PIC16LF877A-I/P |
|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 44-pin TQFP (PT) | 44-pin TQFP (PT) - same | 44-pin TQFP (PT) - same | 44-pin TQFP (PT) - same | 44-pin TQFP (PT) - same |
| Program Memory (Flash) | 14 KB | 14 KB | 7 KB | 14 KB | 14 KB |
| Operating Voltage (VDD) | 2.0 V to 5.5 V | 4.5 V to 5.5 V | 2.0 V to 5.5 V | 2.0 V to 5.5 V | 2.0 V to 5.5 V |
| Maximum CPU Speed | 10 MHz | 20 MHz | 10 MHz | 20 MHz | 10 MHz |
| ADC Channels / Resolution | 8 / 10-bit | 8 / 10-bit | 8 / 10-bit | 14 / 10-bit | 8 / 10-bit |
| EEPROM Data Memory | 256 bytes | 256 bytes | 256 bytes | 256 bytes | 256 bytes |
| Digital I/O Pins | 33 | 33 | 33 | 36 | 33 |
| Operating Temperature | -40 C to +85 C | -40 C to +85 C | -40 C to +85 C | -40 C to +85 C | -40 C to +85 C |
| Drop-in Compatibility | Reference | Drop-in only at >=4.5V | Drop-in (firmware must fit 7KB Flash) | Drop-in (minor SFR differences) | Drop-in (identical die, same PT package) |
Bảo phân biệt quan trọng
- Lower operating voltage range than F variant (vsPIC16F877A-I/PT)
- More Flash memory than 874A sibling (vsPIC16LF874A-I/PT)
- Established legacy toolchain and reference designs (vsPIC16F887-I/PT)
Ghi chú thiết kế
Estimated: at 10MHz and 5V the core draws roughly 5mA active and 1uA sleep. Place a 100nF ceramic decoupling capacitor within 5mm of pins 11 and 32 (VDD) and another at pins 12 and 31 (VSS). For 3.3V operation use the LF variant and a low-dropout regulator such as MCP1700 to minimise quiescent draw.
The 44-TQFP has a 0.8mm pitch; use a copper-poured ground plane on the top layer for thermal dissipation and place VDD/VSS traces on opposite sides to minimise inductive ringing. Route ICSP lines PGD (pin 40) and PGC (pin 39) directly to a 6-pin header without stubs to preserve programming margin, and keep MCLR trace short with a 10k pull-up to VDD.
Do not confuse the LF variant (2.0-5.5V) with the F variant (4.5-5.5V) - applying 3.3V to an F877A will brown-out the device. CONFIG register settings for oscillator (HS vs XT vs LP vs RC) must match the crystal in use; the LF version's 4MHz maximum at 3.3V also means the PLL is disabled. Finally, the parallel slave port shares pins with PORTD, so disable it in firmware if you intend to use those pins as GPIO.
For ADC accuracy below 10 ENOB, isolate the analog VREF+ pin (pin 5) and VREF- pin (pin 4) with a 10uF + 100nF local capacitor pair and keep them away from digital switching traces. RA4 is open-drain on PIC16F877A parts, so an external pull-up is required when used as a digital output. The MSSP pins share PORTB and PORTC, so SPI/I2C use must be coordinated with the application pin map.
Thông tin tuân thủ
RoHS and lead-free confirmed per Microchip product page and DigiKey listing; AEC-Q100 not qualified (industrial -40 to +85C only).