PIC18LF4620-I/P - 8-bit 40MHz MCU 64KB Flash 40-PDIP | Microchip
MPN： PIC18LF4620-I/P ✓ 啟用中PIC18LF4620-I/P 概覽
A microcontroller (MCU) is a single-chip computer that integrates a CPU, non-volatile program memory, working RAM, peripheral I/O, and clock generation on one die. The PIC18 family sits in the broader taxonomy: microcontroller -> embedded processor -> semiconductor -> integrated circuit. Within 8-bit MCUs, PIC18 devices are typically classified by their high-endurance Enhanced Flash memory, hardware multiplier, and C-friendly architecture. The LF suffix denotes the low-voltage variant that supports operation down to 2.0V, enabling battery-powered and 3.3V designs.
Key features include 64KB (32K x 16) of self-programmable Flash, 3968 bytes of SRAM, 1024 bytes of EEPROM data memory, 36 I/O pins with individual direction control, 13 channels of 10-bit ADC, two 8-bit and three 16-bit timers, two capture/compare/PWM modules, Enhanced USART, MSSP supporting SPI and I²C (Master/Slave), two analog comparators, and a hardware 8x8 multiplier. The nanoWatt technology provides power-managed modes including Idle, Sleep, and a low-power Timer1 oscillator for RTC operation.
The architecture uses a 16-bit instruction word with an 8-bit data path and a hardware multiply engine that executes an 8x8 unsigned multiply in a single instruction cycle. The Enhanced Flash supports ICSP (In-Circuit Serial Programming) and self-programming under firmware control, allowing field updates and bootloader designs. The 2.0V minimum supply opens the LF4620 to single-cell Li-ion or 2x AA alkaline applications while remaining drop-in compatible with the 5V PIC18F4620 (which requires 4.2V-5.5V).
Typical applications include industrial control panels, sensor signal conditioning, USB-to-UART bridges, HVAC thermostats, automotive body electronics, home appliances, and general-purpose embedded control boards. The 40-pin PDIP package supports hand-prototyping, breadboard use, and educational platforms, and is favored in through-hole designs where socketed or replaceable parts are required.
When designing with this part, note that the LF and F variants differ only in VDD range (2.0V-5.5V vs 4.2V-5.5V); firmware written for one generally runs on the other. The 40-MHz oscillator can be driven from an external source or ceramic resonator; for RTC accuracy, a 32.768-kHz crystal on Timer1 is recommended. Ensure MCLR is tied to VDD through a 10 kΩ pull-up for normal operation.
This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet alone.
直接替換替代品，適用於 PIC18LF4620-I/P — 相同封裝，腳位對腳位相容。需重新設計 PCB 的不同封裝零件不列入。
此系列的變體
與下列產品可直接替換的同系列型號： PIC18LF4620-I/P （相同外形與佔位） — 差異在於 Package, Program Memory (Flash), Timers, ADC, Data EEPROM.
PIC18F4620-I/PT
✅ 直接替換聯絡詢價
查看資料表 →PIC18LF4520-I/PT
✅ 直接替換聯絡詢價
查看資料表 →PIC18F4620-I/PREL
✅ 直接替換📋 參考替代品（不在目錄中）
PIC18LF4620-I/P 最大額定值與電氣特性
| Device Family | PIC18F (PIC18LF4620) |
| Core Architecture | 8-bit RISC |
| Program Memory (Flash) | 64 KB (32K x 16) |
| Data Memory (SRAM) | 3968 bytes |
| Data EEPROM | 1024 bytes |
| Maximum CPU Speed | 40 MHz (10 MIPS) |
| Supply Voltage (VDD) | 2.0 V to 5.5 V |
| I/O Pins | 36 |
| ADC | 13 channels x 10-bit |
| Timers | 2 x 8-bit, 3 x 16-bit |
| Capture/Compare/PWM | 2 ECCP modules |
| Communication | Enhanced USART, MSSP (SPI / I²C) |
| Analog Comparators | 2 |
| 封裝 | 40-pin PDIP (0.600 in, 15.24 mm) |
| 安裝類型 | Through-Hole (THT) |
| 工作溫度 | -40 °C to +85 °C (Industrial -I) |
| RoHS 狀態 | Compliant |
PIC18LF4620-I/P 腳位配置
| 腳位 1 | MCLR — Master Clear (reset, active low, internal pull-up disabled) |
| 腳位 2 | RA0/AN0 — PORTA bit 0 / Analog input 0 |
| 腳位 3 | RA1/AN1 — PORTA bit 1 / Analog input 1 |
| 腳位 4 | RA2/AN2/VREF- — PORTA bit 2 / Analog input 2 / ADC VREF- |
| 腳位 5 | RA3/AN3/VREF+ — PORTA bit 3 / Analog input 3 / ADC VREF+ |
| 腳位 6 | RA4/T0CKI/C1OUT — PORTA bit 4 / Timer0 clock / Comparator 1 output |
| 腳位 7 | RA5/AN4/SS/C2OUT — PORTA bit 5 / Analog input 4 / SPI slave select / Comparator 2 output |
| 腳位 8 | RE0/RD/AN5 — PORTE bit 0 / Parallel port read / Analog input 5 |
| 腳位 9 | RE1/WR/AN6 — PORTE bit 1 / Parallel port write / Analog input 6 |
| 腳位 10 | RE2/CS/AN7 — PORTE bit 2 / Parallel port chip select / Analog input 7 |
| 腳位 11 | VDD — Positive supply voltage (2.0V-5.5V) |
| 腳位 12 | VSS — Ground reference |
| 腳位 13 | OSC1/CLKI/RA7 — Oscillator input / External clock input / PORTA bit 7 |
| 腳位 14 | OSC2/CLKO/RA6 — Oscillator output / Clock output / PORTA bit 6 |
| 腳位 15 | RC0/T1OSO/T13CKI — PORTC bit 0 / Timer1 oscillator output / Timer1/Timer3 clock input |
| 腳位 16 | RC1/T1OSI/CCP2 — PORTC bit 1 / Timer1 oscillator input / CCP2 I/O |
| 腳位 17 | RC2/CCP1 — PORTC bit 2 / CCP1 I/O |
| 腳位 18 | RC3/SCK/SCL — PORTC bit 3 / SPI clock / I²C clock |
| 腳位 19 | RD0/PSP0 — PORTD bit 0 / Parallel Slave Port bit 0 |
| 腳位 20 | RD1/PSP1 — PORTD bit 1 / Parallel Slave Port bit 1 |
| 腳位 21 | RD2/PSP2 — PORTD bit 2 / Parallel Slave Port bit 2 |
| 腳位 22 | RD3/PSP3 — PORTD bit 3 / Parallel Slave Port bit 3 |
| 腳位 23 | RC4/SDI/SDA — PORTC bit 4 / SPI data in / I²C data |
| 腳位 24 | RC5/SDO — PORTC bit 5 / SPI data out |
| 腳位 25 | RC6/TX/CK — PORTC bit 6 / USART transmit / USART clock |
| 腳位 26 | RC7/RX/DT — PORTC bit 7 / USART receive / USART data |
| 腳位 27 | RD4/PSP4 — PORTD bit 4 / Parallel Slave Port bit 4 |
| 腳位 28 | RD5/PSP5 — PORTD bit 5 / Parallel Slave Port bit 5 |
| 腳位 29 | RD6/PSP6/TX2 — PORTD bit 6 / Parallel Slave Port bit 6 / AUSART TX (4550 family) |
| 腳位 30 | RD7/PSP7/RX2 — PORTD bit 7 / Parallel Slave Port bit 7 / AUSART RX (4550 family) |
| 腳位 31 | VSS — Ground reference |
| 腳位 32 | VDD — Positive supply voltage (2.0V-5.5V) |
| 腳位 33 | RB0/INT0 — PORTB bit 0 / External interrupt 0 |
| 腳位 34 | RB1/INT1 — PORTB bit 1 / External interrupt 1 |
| 腳位 35 | RB2/INT2 — PORTB bit 2 / External interrupt 2 |
| 腳位 36 | RB3/CCP2 — PORTB bit 3 / CCP2 I/O (alternate) |
| 腳位 37 | RB4 — PORTB bit 4 (interrupt-on-change) |
| 腳位 38 | RB5 — PORTB bit 5 (interrupt-on-change) |
| 腳位 39 | RB6/PGC — PORTB bit 6 / ICSP clock (programming) |
| 腳位 40 | RB7/PGD — PORTB bit 7 / ICSP data (programming) |
典型應用
PIC18LF4620-I/P 適用於 6 應用s: Industrial Control Panels, HVAC Thermostats, Sensor Signal Conditioning Hubs, USB-to-UART/RS-485 Bridges, Educational / Maker Platforms, Home Appliance Control Boards.
Industrial Control Panels
The PIC18LF4620-I/P is well suited to industrial control panels requiring 36 digital I/O lines to drive relays, LEDs, keypads, and discrete inputs. Its 40 MHz core and 10 MIPS throughput handle encoder counting, PWM fan control, and protocol bridging on the same chip. The 13-channel 10-bit ADC reads thermistor, pressure, and 4-20 mA loop inputs directly. Wide 2.0V-5.5V supply tolerates noisy 24V industrial rails stepped down to 5V or 3.3V. The 64KB Flash and 3968-byte SRAM comfortably host a real-time operating system or Modbus RTU slave stack. Industrial temperature grade (-40 to +85 °C) ensures operation in unheated enclosures.
推薦
HVAC Thermostats
The PIC18LF4620's nanoWatt technology and wide 2.0V-5.5V supply make it ideal for 24VAC-rectified thermostat designs. Idle/Sleep current drops below 1 µA with Timer1 running on a 32.768-kHz crystal for RTC, while the 13-channel ADC reads indoor/outdoor temperature, humidity, and setpoint potentiometer. The 36 I/O pins drive a multiplexed LCD, pushbuttons, triac outputs for compressor/reversing-valve control, and a UART to indoor air-quality sensors. 64KB Flash and 3.9KB RAM support complex scheduling firmware with adaptive learning curves.
推薦
Sensor Signal Conditioning Hubs
In multi-sensor data acquisition nodes, the PIC18LF4620-I/P aggregates SPI, I²C, and analog signals and forwards them over Enhanced USART (RS-485). The MSSP peripheral simultaneously runs an I²C master reading external sensors while SPI drives a local display. The 13-channel 10-bit ADC at 100 ksps provides oversampled readings on thermistor and ratiometric bridges. With 64KB Flash, the firmware can host digital filtering, calibration tables, and a Modbus stack in one chip. The 40-pin PDIP package is breadboard-friendly for prototype development of sensor hubs.
推薦
USB-to-UART/RS-485 Bridges
While the PIC18LF4620 has no native USB, it pairs naturally with an external FT232 or MCP2200 USB-UART bridge to provide industrial RS-485 converter gateways. The Enhanced USART supports 9-bit addressing for multi-drop RS-485, and the MSSP adds an I²C gateway leg. 40 MHz throughput sustains 115.2 kbps UART and 1 Mbps SPI simultaneously. The 2.0V-5.5V supply allows 3.3V-powered bridges for low-power instrumentation. 64KB Flash accommodates Modbus/RTU, custom protocol parsers, and OTA-style firmware updates via the bootloader area.
推薦
Educational / Maker Platforms
The 40-pin PDIP package of PIC18LF4620-I/P is breadboard-friendly and supports repeated insertion/removal, making it a preferred MCU for university embedded courses, hobbyist trainers, and PICkit-programmer starter kits. Students gain access to USART, MSSP, ECCP, ADC, timers, and interrupts on a single device with 64KB Flash. The MPLAB X IDE supports this chip with C18/XC8 compilers. The 2.0V-5.5V supply is forgiving to student-wired power supplies, reducing accidental damage from 3.3V/5V mix-ups. Through-hole assembly requires no reflow oven or fine-pitch soldering skills.
推薦
Home Appliance Control Boards
In washing machines, dishwashers, and microwave ovens, the PIC18LF4620-I/P drives seven-segment or character LCD displays, keypad inputs, and triac-switched AC loads through optoisolators. The ECCP modules generate zero-crossing-synchronized PWM for proportional heater control. The 13-channel ADC reads water level, temperature, and motor current feedback. nanoWatt Sleep mode lets the appliance enter standby below 1 mA while still polling the keypad. 64KB Flash accommodates complex wash-cycle algorithms, fault logging, and diagnostic menus.
推薦
推薦產品摘要
工程參考資料，適用於 PIC18LF4620-I/P — 比較、設計指引及合規資訊。
選型指南
與替代品比較
| 參數 | 本產品 | PIC18F4620-I/P | PIC18LF4520-I/P | PIC18F4620-I/PREL |
|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 40-pin PDIP | 40-pin PDIP - same | 40-pin PDIP - same | 40-pin PDIP - same |
| Program Memory | 64 KB Flash | 64 KB Flash | 32 KB Flash (-50%) | 64 KB Flash |
| RAM | 3968 bytes | 3968 bytes | 1536 bytes (-61%) | 3968 bytes |
| Supply Voltage | 2.0 V to 5.5 V | 4.2 V to 5.5 V | 2.0 V to 5.5 V | 4.2 V to 5.5 V |
| Max Clock Speed | 40 MHz (10 MIPS) | 40 MHz (10 MIPS) | 40 MHz (10 MIPS) | 40 MHz (10 MIPS) |
| I/O Pins | 36 | 36 | 36 | 36 |
| ADC | 13 x 10-bit | 13 x 10-bit | 13 x 10-bit | 13 x 10-bit |
| Operating Temperature | -40 °C to +85 °C | -40 °C to +85 °C | -40 °C to +85 °C | -40 °C to +85 °C |
主要差異化特點
- Wide 2.0V-5.5V supply supports battery-powered and 3.3V designs (對比PIC18F4620-I/P)
- 64 KB Flash and 3968 bytes RAM - largest in the PIC18F4620 generation (對比PIC18LF4520-I/P)
- Through-hole PDIP-40 package for breadboard and hand-prototype use (對比PIC18LF4620-I/PT (TQFP-44))
設計說明
PIC18LF4620-I/P VDD pins are 11 and 32; both must be decoupled with 100 nF ceramic caps placed within 5 mm of each pin. Add a bulk 10 µF tantalum or aluminum-polymer cap at the board entry point. The wide 2.0V-5.5V supply allows direct 3.3 V regulator output (e.g. MCP1700) without level shifters; for 5 V systems use an LDO like MCP1825S. Average active current at 40 MHz and 5 V is approximately 16 mA; nanoWatt Sleep drops this below 1 µA with Timer1 running on a 32.768 kHz crystal.
Do not confuse PIC18LF4620 (2.0V-5.5V) with PIC18F4620 (4.2V-5.5V): firmware designed for the LF version running on the F version at 3.3V will brown out the supply. PIC18LF4620-I/PT and PIC18LF4620-I/ML are TQFP-44 and QFN-44 surface-mount variants — they are NOT drop-in replacements for the PDIP-40 -I/P. Confirm package code suffix (-I/P, -I/PT, -I/ML) on the order. MCLR requires a 10 kΩ pull-up to VDD; leaving MCLR floating causes erratic resets.
Keep the 40-MHz crystal or resonator traces under 5 mm and symmetric. Place a 1 MΩ resistor across the crystal or use a 4-component Pierce oscillator layout per Microchip AN826. For ADC accuracy, route analog traces (AN0-AN7) away from digital switching signals; the 13-channel ADC can sample at up to 100 ksps. Add a ground pour under the analog section and stitch VSS pins 12 and 31 with multiple vias to the ground plane to reduce ADC reference drift.
The MSSP peripheral shares RC3 (SCL/SCK) and RC4 (SDA/SDI) between I²C and SPI modes - firmware must reconfigure TRIS bits when switching. For I²C buses above 400 kHz, add 4.7 kΩ pull-ups on SCL/SDA and place a 100 pF cap to suppress ringing. The Enhanced USART on RC6/RC7 supports 9-bit protocol, useful for RS-485 multi-drop addressing.
合規資訊
RoHS-compliant per Microchip product page. Industrial (-I) temperature grade -40 °C to +85 °C. Not AEC-Q100 qualified - for AEC-Q100 automotive, look at PIC18F4620-I/P automotive extensions or PIC18F66 family.
