PIC16LF877AT-I/PT - 8-bit MCU, 14KB Flash, 33 I/O, 44-TQFP | Microchip
MPN: PIC16LF877AT-I/PT ✓ Hoạt độngPIC16LF877AT-I/PT Tóm tắt
An 8-bit microcontroller (MCU) is a single-chip computer that integrates a CPU, program memory (Flash/ROM), data memory (RAM), and peripherals (timers, ADC, communication ports) into one IC. PIC microcontrollers sit in the 8-bit MCU hierarchy: microcontroller -> embedded controller -> semiconductor IC, and serve as the "decision makers" in embedded products from coffee makers to industrial drives. The 16F family is Microchip's mid-range 8-bit line with a 14-bit instruction word and 35 single-word instructions, enabling extremely compact code and deterministic interrupt response.
Key features of the PIC16LF877AT-I/PT include: a 20 MHz maximum operating frequency (200 ns instruction cycle), a 10-bit ADC with up to 8 channels, two analog comparators, a Capture/Compare/PWM (CCP) module, enhanced Enhanced Universal Synchronous Asynchronous Receiver Transmitter (EUSART), Master Synchronous Serial Port (MSSP) supporting SPI and I2C, two 8-bit timers plus one 16-bit timer, a watchdog timer, in-circuit serial programming (ICSP), and nanoWatt power management with multiple sleep modes.
The 20 MHz core paired with a 14-bit instruction word delivers approximately 5 MIPS of throughput, while the wide 2.0V-5.5V supply range allows direct operation from a single Li-Ion cell, two AA cells, or a regulated 3.3V/5V rail. Internal oscillators and PLL trimming on the LF variant further reduce external component count, simplifying layout for space-constrained designs.
Typical applications include industrial sensor interfaces, motor-control front ends, low-power data acquisition nodes, automotive body electronics (non-safety), and consumer appliance controllers. The 44-pin TQFP exposes up to 33 digital I/O, sufficient for keypad scanning, LCD driving, and parallel bus bridging. Designers value this device for migration paths from older PIC16F877 designs that need lower voltage operation or a tape-and-reel SMD footprint.
When designing with this part, allocate the oscillator and ICSP pins (OSC1/CLK, OSC2/CLKOUT, RB6/PGC, RB7/PGD) on dedicated PCB traces and add a 100 nF decoupling capacitor within 5 mm of VDD. Avoid mapping analog inputs to pins used by the comparator outputs without verifying alternate-function routing, and respect VDD/VSS pairing for the 44-pin TQFP power pins.
Bộ thay thế dễ dàng lắp đặt cho PIC16LF877AT-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 PIC16LF877AT-I/PT (cùng hình factor và footprint) — khác nhau ở Package, Timers, Serial Interfaces, Mounting Type, Operating Temperature.
PIC16LF877A-I/PT
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →PIC16F877AT-I/PT
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →PIC16LF877-04I/PT
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →PIC16LF877A-I/P
✅ Drop-In ⚠️ Thông số chưa được xác minhLiên hệ để biết giá
Xem tài liệu →PIC16F877A-E/L
✅ Drop-In ⚠️ Thông số chưa được xác minhLiên hệ để biết giá
Xem tài liệu →PIC16LF877AT-I/PT Tỷ lệ tối đa & tính chất điện
| Core Architecture | PIC16 8-bit RISC |
| Instruction Word Size | 14-bit |
| Maximum CPU Frequency | 20 MHz |
| Program Memory (Flash) | 14 KB (8K x 14 words) |
| Data RAM | 368 bytes |
| Data EEPROM | 256 bytes |
| Supply Voltage (VDD) | 2.0 V to 5.5 V |
| Number of I/O Pins | 33 |
| ADC | 10-bit, up to 8 channels |
| Timers | 2 x 8-bit, 1 x 16-bit |
| Communication | EUSART, MSSP (SPI/I2C) |
| Nhiệt độ hoạt động | -40 C to +85 C (Industrial) |
| Hộp | 44-pin TQFP (10x10 mm) |
| Kiểu lắp đặt | Surface Mount (Tape & Reel) |
| ICSP / Debug | In-Circuit Serial Programming supported |
| Power-Saving Modes | nanoWatt (Sleep, low-power instructions) |
Cấu hình chân PIC16LF877AT-I/PT
| Chân 1 | MCLR/VPP/RE3 — Master Clear (reset) input / programming voltage / PORTE bit 3 |
| Chân 2 | RA0/AN0 — PORTA bit 0 / analog input channel 0 |
| Chân 3 | RA1/AN1 — PORTA bit 1 / analog input channel 1 |
| Chân 4 | RA2/AN2/VREF- — PORTA bit 2 / analog input 2 / ADC VREF- |
| Chân 5 | RA3/AN3/VREF+ — PORTA bit 3 / analog input 3 / ADC VREF+ |
| Chân 6 | RA4/T0CKI/C1OUT — PORTA bit 4 / Timer0 clock / comparator 1 output |
| Chân 7 | RA5/AN4/SS/C2OUT — PORTA bit 5 / analog 4 / SPI slave select / comparator 2 output |
| Chân 8 | RE0/RD/AN5 — PORTE bit 0 / parallel read / analog 5 |
| Chân 9 | RE1/WR/AN6 — PORTE bit 1 / parallel write / analog 6 |
| Chân 10 | RE2/CS/AN7 — PORTE bit 2 / parallel chip select / analog 7 |
| Chân 11 | VDD — Positive supply (2.0-5.5 V) |
| Chân 12 | VSS — Ground |
| Chân 13 | OSC1/CLKI — Crystal oscillator input / external clock |
| Chân 14 | OSC2/CLKO — Crystal oscillator output / clock out |
| Chân 15 | RC0/T1OSO/T1CKI — PORTC bit 0 / Timer1 oscillator out / Timer1 clock in |
| Chân 16 | RC1/T1OSI/CCP2 — PORTC bit 1 / Timer1 oscillator in / CCP2 |
| Chân 17 | RC2/CCP1 — PORTC bit 2 / CCP1 (PWM/capture/compare) |
| Chân 18 | RC3/SCK/SCL — PORTC bit 3 / SPI clock / I2C clock |
| Chân 19 | RD0 — PORTD bit 0 |
| Chân 20 | RD1 — PORTD bit 1 |
| Chân 21 | RD2 — PORTD bit 2 |
| Chân 22 | RD3 — PORTD bit 3 |
| Chân 23 | RC4/SDI/SDA — PORTC bit 4 / SPI data in / I2C data |
| Chân 24 | RC5/SDO — PORTC bit 5 / SPI data out |
| Chân 25 | RC6/TX/CK — PORTC bit 6 / EUSART TX / clock |
| Chân 26 | RC7/RX/DT — PORTC bit 7 / EUSART RX / data |
| Chân 27 | RD4 — PORTD bit 4 |
| Chân 28 | RD5 — PORTD bit 5 |
| Chân 29 | RD6/PSP6 — PORTD bit 6 / parallel slave port |
| Chân 30 | RD7/PSP7 — PORTD bit 7 / parallel slave port |
| Chân 31 | VSS — Ground (second tap) |
| Chân 32 | VDD — Positive supply (second tap) |
| Chân 33 | RB0/INT — PORTB bit 0 / external interrupt |
| Chân 34 | RB1 — PORTB bit 1 |
| Chân 35 | RB2 — PORTB bit 2 |
| Chân 36 | RB3/PGM — PORTB bit 3 / low-voltage programming |
| Chân 37 | RB4 — PORTB bit 4 |
| Chân 38 | RB5 — PORTB bit 5 |
| Chân 39 | RB6/PGC — PORTB bit 6 / ICSP clock (ICD clock) |
| Chân 40 | RB7/PGD — PORTB bit 7 / ICSP data (ICD data) |
| Chân 41 | VSS — Ground (third tap) |
| Chân 42 | VDD — Positive supply (third tap) |
| Chân 43 | NC — Not connected (per datasheet) |
| Chân 44 | NC — Not connected (per datasheet) |
Ứng dụng tiêu biểu
PIC16LF877AT-I/PT phù hợp cho 6 Áp dụngs: Industrial Sensor Interface Module, Low-Power Battery-Powered Data Logger, Small Appliance Motor Control, Automotive Body Electronics (Non-Safety), Consumer Appliance User Interface Board, RS-232/RS-485 Sensor Network Bridge.
Industrial Sensor Interface Module
PIC16LF877AT-I/PT suits industrial sensor-interface modules where its 10-bit ADC, 8 analog channels, and 33 I/O handle multiple transducer inputs at once. The 2.0-5.5 V VDD range lets the same MCU run from a 24V->5V industrial bus or a 3.3V regulated rail. Designers map analog channels to thermistor or strain-gauge bridges, while the EUSART streams telemetry to a host PLC at 115,200 baud or higher. Its 14 KB Flash accommodates look-up tables for linearization and the 368 B RAM can buffer up to 16 sample frames.
Được đề xuất
Low-Power Battery-Powered Data Logger
PIC16LF877AT-I/PT is a strong fit for battery-powered data loggers drawing from the nanoWatt sleep modes and 2.0 V minimum VDD. With the ADC and EEPROM on-chip, the MCU can wake, capture, log, and return to deep sleep without external RTC glue. A two-AA alkaline pack delivers ~3.0 V that is right in the supply sweet spot, and the EUSART can dump logs via UART at full 20 MHz speed. The 14 KB Flash stores the state machine and compression routines, while 256 B EEPROM tolerates >1M write cycles for non-volatile event logs.
Được đề xuất
Small Appliance Motor Control
PIC16LF877AT-I/PT can drive brushed DC or unipolar stepper motor control loops with the CCP module for PWM generation and the 16-bit timer for commutation timing. The 20 MHz core executes a 4 kHz PWM ISR with overhead to spare for current sensing via the 10-bit ADC and overcurrent shutdown via the analog comparator. Industrial-grade temperature range (-40 to +85 C) covers appliance cabinets. The 44-TQFP package fits behind the keypad PCB and the 33 I/O drive multiplexed 7-segment, button matrix, and triac control lines.
Được đề xuất
Automotive Body Electronics (Non-Safety)
PIC16LF877AT-I/PT fits non-safety automotive body-electronics roles (interior lighting controllers, climate panel modules, seat-position memories) where 44-TQFP and 33 I/O expose enough signals for keypad, LCD, and LIN-style serial links. Industrial temperature grade covers cabin thermal envelopes; the wide supply range tolerates load-dump after-filter rails down to ~4 V. Designers implement UART-based K-line/LIN firmware in 14 KB Flash and use the analog comparator for overcurrent protection of seat motors or window switches.
Được đề xuất
Consumer Appliance User Interface Board
PIC16LF877AT-I/PT hosts the user-interface board in consumer appliances like coffee machines, washing machines, and microwave ovens. Its 33 I/O drive multiplexed 7-segment displays, button matrices, rotary encoders, and buzzer PWM via the CCP module. The MSSP supports both SPI (for dot-matrix LCD) and I2C (for keypad or temperature sensors) on the same bus pins via Peripheral Pin Select alternatives. With RTC-free operation, the MCU keeps BOM lean while retaining ICSP for in-field firmware updates over a service connector.
Được đề xuất
RS-232/RS-485 Sensor Network Bridge
PIC16LF877AT-I/PT serves as the bridge MCU for protocol conversion between UART-based sensors and RS-485 multi-drop industrial networks. The EUSART provides the asynchronous serial channel, while the MSSP drives SPI sensors and I2C accessories from a single bus. Its 14 KB Flash implements Modbus RTU command parsers and CRC checks, freeing up the host PLC. The 44-TQFP footprint exposes the dedicated MCLR and ICSP pins for service-port configuration without affecting firmware-loading on the host.
Được đề xuất
Tóm tắt các sản phẩm được đề xuất
Dữ liệu tham khảo kỹ thuật cho PIC16LF877AT-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 | PIC16LF877A-I/PT | PIC16F877AT-I/PT | PIC16LF877-04I/PT |
|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | TQFP-44 (10x10 mm) | TQFP-44 - same | TQFP-44 - same | TQFP-44 - same |
| Core / Frequency | PIC16 8-bit, 20 MHz | PIC16 8-bit, 20 MHz | PIC16 8-bit, 20 MHz | PIC16 8-bit, 4 MHz |
| Program Memory (Flash) | 14 KB | 14 KB | 14 KB | 14 KB |
| Data RAM | 368 B | 368 B | 368 B | 368 B |
| EEPROM | 256 B | 256 B | 256 B | 256 B |
| VDD Range | 2.0 V to 5.5 V | 2.0 V to 5.5 V | 4.0 V to 5.5 V | 2.0 V to 5.5 V |
| ADC | 10-bit, 8 channels | 10-bit, 8 channels | 10-bit, 8 channels | 10-bit, 8 channels |
Bảo phân biệt quan trọng
- Wide-voltage LF silicon (2.0-5.5 V) for battery operation (vsPIC16F877AT-I/PT)
- Full 20 MHz performance at all supply voltages (vsPIC16LF877-04I/PT)
- 44-TQFP package with exposed thermal footprint (vsPIC16LF877A-I/P (PDIP-40))
Ghi chú thiết kế
Add a 100 nF ceramic decoupling capacitor within 5 mm of every VDD/VSS pair (pin 12/11, 32/31, 42/41). Place a bulk 10 uF aluminum-polymer cap at the board supply rail. The LF variant draws roughly 4 mA active at 20 MHz and <1 uA in deep sleep, so power-rail impedance matters mainly during fast ADC bursts.
Route the MCLR/RA5 pin (pin 1) with a 10 kohm pull-up to VDD and a 100 nF cap to ground for hardware reset; omit the cap if using internal MCLR only. Keep the ICSP/PGD (pin 40) and ICSP/PGC (pin 39) traces short (<50 mm) and away from switching nodes to avoid debugger noise. Use a 4-layer PCB if 20 MHz peripherals are present, otherwise 2-layer with a ground pour suffices.
Do not program the configuration bits to use the internal RC oscillator without checking the application timing margins, as the calibrated accuracy is +/-2%. Analog channels A0-A7 multiplex with PORTA/PORTE pins - leave VREF+/VREF- disconnected when using internal 5 V references to avoid conflict. The CCP1 pin (RC2) is not 5V-tolerant when the device is powered at 2.0 V; clamp signals with a series resistor.
Thông tin tuân thủ
RoHS-compliant per Microchip product page 39582C datasheet. Industrial grade (-40C to +85C), not AEC-Q100 qualified; not recommended for automotive safety functions.