PIC16LF877AT-I/PT - 8-bit MCU, 14KB Flash, 33 I/O, 44-TQFP | Microchip
MPN: PIC16LF877AT-I/PT ✓ פעילPIC16LF877AT-I/PT סקירה
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.
חלופות תחליף ישיר עבור PIC16LF877AT-I/PT — אותו מארז, תואם פין-לפין. חלקים במארז שונה הדורשים עיבוד מחדש של ה-PCB אינם נכללים.
וריאנטים בסדרה זו
דגמים מאותה סדרה התואמים Drop-in עם PIC16LF877AT-I/PT (אותו גורם צורה וטביעת רגל) — שונים ב Package, Timers, Serial Interfaces, Mounting Type, Operating Temperature.
PIC16LF877A-I/PT
✅ Drop-Inצור קשר לקבלת מחיר
הצג גיליון נתונים ←PIC16F877AT-I/PT
✅ Drop-Inצור קשר לקבלת מחיר
הצג גיליון נתונים ←PIC16LF877-04I/PT
✅ Drop-Inצור קשר לקבלת מחיר
הצג גיליון נתונים ←PIC16LF877A-I/P
✅ Drop-In ⚠️ מפרטים לא מאומתיםצור קשר לקבלת מחיר
הצג גיליון נתונים ←PIC16F877A-E/L
✅ Drop-In ⚠️ מפרטים לא מאומתיםצור קשר לקבלת מחיר
הצג גיליון נתונים ←PIC16LF877AT-I/PT דירוגים מרביים ומאפיינים חשמליים
| 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) |
| טמפרטורת פעולה | -40 C to +85 C (Industrial) |
| מארז | 44-pin TQFP (10x10 mm) |
| סוג הרכבה | Surface Mount (Tape & Reel) |
| ICSP / Debug | In-Circuit Serial Programming supported |
| Power-Saving Modes | nanoWatt (Sleep, low-power instructions) |
תצורת פינים של PIC16LF877AT-I/PT
| פין 1 | MCLR/VPP/RE3 — Master Clear (reset) input / programming voltage / PORTE bit 3 |
| פין 2 | RA0/AN0 — PORTA bit 0 / analog input channel 0 |
| פין 3 | RA1/AN1 — PORTA bit 1 / analog input channel 1 |
| פין 4 | RA2/AN2/VREF- — PORTA bit 2 / analog input 2 / ADC VREF- |
| פין 5 | RA3/AN3/VREF+ — PORTA bit 3 / analog input 3 / ADC VREF+ |
| פין 6 | RA4/T0CKI/C1OUT — PORTA bit 4 / Timer0 clock / comparator 1 output |
| פין 7 | RA5/AN4/SS/C2OUT — PORTA bit 5 / analog 4 / SPI slave select / comparator 2 output |
| פין 8 | RE0/RD/AN5 — PORTE bit 0 / parallel read / analog 5 |
| פין 9 | RE1/WR/AN6 — PORTE bit 1 / parallel write / analog 6 |
| פין 10 | RE2/CS/AN7 — PORTE bit 2 / parallel chip select / analog 7 |
| פין 11 | VDD — Positive supply (2.0-5.5 V) |
| פין 12 | VSS — Ground |
| פין 13 | OSC1/CLKI — Crystal oscillator input / external clock |
| פין 14 | OSC2/CLKO — Crystal oscillator output / clock out |
| פין 15 | RC0/T1OSO/T1CKI — PORTC bit 0 / Timer1 oscillator out / Timer1 clock in |
| פין 16 | RC1/T1OSI/CCP2 — PORTC bit 1 / Timer1 oscillator in / CCP2 |
| פין 17 | RC2/CCP1 — PORTC bit 2 / CCP1 (PWM/capture/compare) |
| פין 18 | RC3/SCK/SCL — PORTC bit 3 / SPI clock / I2C clock |
| פין 19 | RD0 — PORTD bit 0 |
| פין 20 | RD1 — PORTD bit 1 |
| פין 21 | RD2 — PORTD bit 2 |
| פין 22 | RD3 — PORTD bit 3 |
| פין 23 | RC4/SDI/SDA — PORTC bit 4 / SPI data in / I2C data |
| פין 24 | RC5/SDO — PORTC bit 5 / SPI data out |
| פין 25 | RC6/TX/CK — PORTC bit 6 / EUSART TX / clock |
| פין 26 | RC7/RX/DT — PORTC bit 7 / EUSART RX / data |
| פין 27 | RD4 — PORTD bit 4 |
| פין 28 | RD5 — PORTD bit 5 |
| פין 29 | RD6/PSP6 — PORTD bit 6 / parallel slave port |
| פין 30 | RD7/PSP7 — PORTD bit 7 / parallel slave port |
| פין 31 | VSS — Ground (second tap) |
| פין 32 | VDD — Positive supply (second tap) |
| פין 33 | RB0/INT — PORTB bit 0 / external interrupt |
| פין 34 | RB1 — PORTB bit 1 |
| פין 35 | RB2 — PORTB bit 2 |
| פין 36 | RB3/PGM — PORTB bit 3 / low-voltage programming |
| פין 37 | RB4 — PORTB bit 4 |
| פין 38 | RB5 — PORTB bit 5 |
| פין 39 | RB6/PGC — PORTB bit 6 / ICSP clock (ICD clock) |
| פין 40 | RB7/PGD — PORTB bit 7 / ICSP data (ICD data) |
| פין 41 | VSS — Ground (third tap) |
| פין 42 | VDD — Positive supply (third tap) |
| פין 43 | NC — Not connected (per datasheet) |
| פין 44 | NC — Not connected (per datasheet) |
יישומים טיפוסיים
PIC16LF877AT-I/PT מתאים עבור 6 יישוםs: 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.
מומלץ
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.
מומלץ
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.
מומלץ
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.
מומלץ
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.
מומלץ
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.
מומלץ
סיכום מוצרים מומלצים
נתוני עזר הנדסיים עבור PIC16LF877AT-I/PT — השוואה, הנחיות תכנון ומידע על תאימות.
מדריך בחירה
השוואה עם חלופות
| פרמטר | מוצר זה | 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 |
מבדילים עיקריים
- Wide-voltage LF silicon (2.0-5.5 V) for battery operation (לעומתPIC16F877AT-I/PT)
- Full 20 MHz performance at all supply voltages (לעומתPIC16LF877-04I/PT)
- 44-TQFP package with exposed thermal footprint (לעומתPIC16LF877A-I/P (PDIP-40))
הערות תכנון
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.
מידע על תאימות
RoHS-compliant per Microchip product page 39582C datasheet. Industrial grade (-40C to +85C), not AEC-Q100 qualified; not recommended for automotive safety functions.