PIC18F45K20-I/ML - 8-bit 64MHz MCU 32KB Flash 44-QFN | Microchip
MPN: PIC18F45K20-I/ML ✓ פעילPIC18F45K20-I/ML סקירה
A microcontroller (MCU) is a single-chip computer that integrates a CPU core, program and data memory, peripherals, and I/O. The PIC18 family uses an enhanced 8-bit RISC Harvard architecture with hardware multiplier and 16-bit wide instructions, sitting between 16-bit PIC24 parts and 8-bit PIC16/12 parts in the Microchip portfolio. XLP (nanoWatt eXtreme Low Power) is Microchip's branding for ultra-low sleep current (<100 nA typical) suitable for battery-powered edge devices. The K-series in particular targets migration from legacy PIC18F4xK20 designs by offering more memory and analog channels.
Key specifications include 1.8-3.6V core operation with 4.2-5.5V extended Vdd range (with internal 1.2V FVR reference), 32 KB self-programmable Flash, 1.5 KB SRAM, 256 B EEPROM, 36 digital I/O, and four timer modules. The 10-bit ADC supports 14 channels with auto-acquisition and is operable during Sleep for low-power sensing. Two analog comparators with independent input multiplexing and programmable reference enable mixed-voltage designs without external op-amps.
The device uses a high-performance 8-bit RISC core with a hardware multiply and a 16-level hardware stack. Internal PLL multiplies the 16 MHz HFINTOSC up to 64 MHz, eliminating external crystals in cost-sensitive designs. The 1.2V fixed voltage reference (FVR) channel provides a stable on-chip reference for the ADC and comparators, while charge time measurement unit (CTMU) support enables capacitive touch and time-of-flight measurement.
Typical applications include low-power remote sensor nodes, HVAC and thermostat controllers, consumer white goods, battery chargers, USB-to-UART bridges (combined with external PHY), home automation gateways, and small industrial control boards where sleep current, on-chip analog, and 5V tolerance are critical. The 25 mA sink/source also supports direct LED driving without external transistors.
When designing with this MCU, observe Vdd/Vss decoupling guidance (100 nF + bulk), and review errata for any silicon revisions in the JEDEC-qualified QFN-44 footprint. For new designs, consider PIC18F45K22 for additional memory and peripherals, or PIC18F46K20 for 64 KB Flash in the same package.
This page synthesizes distributor pricing, parametric drop-in alternatives, and practical design notes that go beyond what the manufacturer datasheet alone provides.
חלופות תחליף ישיר עבור PIC18F45K20-I/ML — 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 PIC18F45K20-I/ML (אותו גורם צורה וטביעת רגל) — שונים ב ADC, Core Architecture, Timers, Package, MSL Level.
PIC18F45K22-I/ML
✅ Drop-Inצור קשר לקבלת מחיר
הצג גיליון נתונים ←PIC18F46K20-I/ML
✅ Drop-Inצור קשר לקבלת מחיר
הצג גיליון נתונים ←PIC18F44K20-I/ML
✅ Drop-In📋 חלופה להתייחסות (לא בקטלוג)
PIC18F43K20-I/ML
✅ Drop-Inצור קשר לקבלת מחיר
הצג גיליון נתונים ←PIC18F45J11-I/ML
✅ Drop-Inצור קשר לקבלת מחיר
הצג גיליון נתונים ←PIC18F45K20-I/ML דירוגים מרביים ומאפיינים חשמליים
| Core Architecture | PIC 8-bit RISC (Harvard) |
| Core Size | 8-bit |
| Program Memory | 32 KB Flash (16K x 16 words) |
| RAM | 1536 bytes |
| EEPROM | 256 bytes |
| Maximum CPU Speed | 64 MHz (16 MIPS) |
| Operating Voltage (Vdd) | 1.8 V to 3.6 V (4.2 V to 5.5 V extended) |
| I/O Pins | 36 |
| ADC | 10-bit, 14 channels |
| Analog Comparators | 2 (rail-to-rail) |
| Timers | 4 (Timer0/1/2/3) |
| CCP Modules | 2 (Capture/Compare/PWM) |
| Serial Interfaces | EUSART, MSSP (SPI / I2C) |
| Internal Oscillator | 16 MHz HFINTOSC with PLL to 64 MHz |
| Fixed Voltage Reference | 1.2 V on-chip FVR |
| I/O Sink/Source | 25 mA / 25 mA |
| מארז | 44-pin QFN (8x8 mm) with exposed pad |
| סוג הרכבה | Surface Mount |
| טמפרטורת פעולה | -40C to +85C (Industrial) |
| סטטוס RoHS | Compliant |
| רמת MSL | 3 (168 hours) |
תצורת פינים של PIC18F45K20-I/ML
| פין 1 | AVDD — Analog supply voltage |
| פין 2 | RA0/AN0 — PORTA bit 0 / Analog input 0 |
| פין 3 | RA1/AN1 — PORTA bit 1 / Analog input 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 — PORTA bit 4 |
| פין 7 | RA5/AN4 — PORTA bit 5 / Analog input 4 |
| פין 8 | AVSS — Analog ground |
| פין 9 | OSC1/CLKI/RA7 — Crystal input / External clock / PORTA bit 7 |
| פין 10 | OSC2/CLKO/RA6 — Crystal output / Clock output / PORTA bit 6 |
| פין 11 | VDD — Digital supply voltage |
| פין 12 | VSS — Digital ground |
| פין 13 | RB0/INT0/FLT0 — PORTB bit 0 / External interrupt 0 / PWM fault |
| פין 14 | RB1/INT1 — PORTB bit 1 / External interrupt 1 |
| פין 15 | RB2/INT2 — PORTB bit 2 / External interrupt 2 |
| פין 16 | RB3/CCP2 — PORTB bit 3 / Capture/Compare/PWM 2 |
| פין 17 | RB4 — PORTB bit 4 |
| פין 18 | RB5/CCP1 — PORTB bit 5 / Capture/Compare/PWM 1 |
| פין 19 | RB6/PGC — PORTB bit 6 / ICSP clock |
| פין 20 | RB7/PGD — PORTB bit 7 / ICSP data |
| פין 21 | RC0/T1OSO/T1CKI — PORTC bit 0 / Timer1 oscillator output / Timer1 clock input |
| פין 22 | RC1/T1OSI/CCP2 — PORTC bit 1 / Timer1 oscillator input / CCP2 |
| פין 23 | RC2/CCP1 — PORTC bit 2 / CCP1 |
| פין 24 | RC3/SCK/SCL — PORTC bit 3 / MSSP SPI clock / I2C clock |
| פין 25 | RC4/SDI/SDA — PORTC bit 4 / MSSP SPI data in / I2C data |
| פין 26 | RC5/SDO — PORTC bit 5 / MSSP SPI data out |
| פין 27 | RC6/TX/CK — PORTC bit 6 / EUSART TX / EUSART clock |
| פין 28 | RC7/RX/DT — PORTC bit 7 / EUSART RX / EUSART data |
| פין 29 | RE0/RD/AN5 — PORTE bit 0 / Parallel slave read / Analog input 5 |
| פין 30 | RE1/WR/AN6 — PORTE bit 1 / Parallel slave write / Analog input 6 |
| פין 31 | RE2/CS/AN7 — PORTE bit 2 / Parallel slave chip select / Analog input 7 |
| פין 32 | VDD — Digital supply voltage |
| פין 33 | VSS — Digital ground |
| פין 34 | RF0/AN8 — PORTF bit 0 / Analog input 8 |
| פין 35 | RF1/AN9/C2OUT — PORTF bit 1 / Analog input 9 / Comparator 2 output |
| פין 36 | RF2/AN10/C1OUT — PORTF bit 2 / Analog input 10 / Comparator 1 output |
| פין 37 | RF3/AN11 — PORTF bit 3 / Analog input 11 |
| פין 38 | RF4/AN12 — PORTF bit 4 / Analog input 12 |
| פין 39 | RF5/AN13 — PORTF bit 5 / Analog input 13 |
| פין 40 | RF6 — PORTF bit 6 |
| פין 41 | RF7 — PORTF bit 7 |
| פין 42 | VDD — Digital supply voltage |
| פין 43 | VSS — Digital ground |
| פין 44 | MCLR/VPP/RE3 — Master clear reset / Programming voltage / PORTE bit 3 |
יישומים טיפוסיים
PIC18F45K20-I/ML מתאים עבור 7 יישוםs: Battery-Powered Remote Sensor Nodes, HVAC and Thermostat Controllers, USB-to-UART Bridge Devices, Consumer White Goods Control Boards, Home Automation Gateways, LED Lighting and Display Controllers, Small Industrial Control and Monitoring.
Battery-Powered Remote Sensor Nodes
The PIC18F45K20-I/ML fits battery-powered remote sensor nodes because its nanoWatt XLP technology delivers sub-100 nA sleep current while retaining 32 KB Flash for sensor fusion and protocol stacks. The 64 MHz core supports on-sensor FFT and oversampling, while the 1.2V FVR ensures ADC accuracy across battery discharge. The 14-channel 10-bit ADC handles multi-sensor analog inputs without external multiplexer. In typical 3.3V coin-cell deployments, sleep current dominates total energy, and the K20 architecture maintains RAM retention at <50 nA. Pair with a sub-GHz radio module over SPI for complete node implementation.
מומלץ
HVAC and Thermostat Controllers
The PIC18F45K20-I/ML suits HVAC and thermostat controllers because its 36 I/O with 25 mA sink/source drives triac interfaces, relay coils, and seven-segment displays directly without external transistors. The two rail-to-rail analog comparators handle thermistor and humidity sensor signal conditioning, while the 10-bit ADC with 14 channels monitors multiple temperature zones. The industrial temperature grade (-40C to +85C) supports attic and rooftop installations. With internal 64 MHz PLL, no external crystal is required, reducing BOM cost for consumer-priced thermostats.
מומלץ
USB-to-UART Bridge Devices
The PIC18F45K20-I/ML works as a USB-to-UART bridge controller when paired with an external USB PHY, because its EUSART module provides hardware UART flow control and its MSSP supports SPI to external devices. The 32 KB Flash fits CDC class drivers and protocol translation firmware, while the 64 MHz core handles full-speed USB packet handling when using a software USB stack. For designs migrating from legacy PIC18F4550 USB parts, the K20 offers similar peripherals with nanoWatt XLP for sleep when USB is idle.
מומלץ
Consumer White Goods Control Boards
The PIC18F45K20-I/ML fits washing machine, dishwasher, and refrigerator control boards because its 5V-tolerant extended Vdd range interfaces directly with mains-side signal conditioning. The 36 high-current I/O (25 mA/25 mA) drives LED indicators, buzzer circuits, and relay coils. Industrial temperature grade survives compressor-adjacent thermal stress. The on-chip EUSART and MSSP communicate with motor inverter boards and sensor front-ends, while the 14-channel ADC monitors temperature, pressure, and water-level sensors. The K20's proven long-term availability supports consumer product lifecycles.
מומלץ
Home Automation Gateways
The PIC18F45K20-I/ML serves in home automation gateways because its 32 KB Flash stores Zigbee or Z-Wave stack portions while 1536 bytes RAM handles packet buffers and routing tables. The EUSART interfaces with the radio modem over UART, while MSSP provides SPI access to non-volatile memory for routing table persistence. The 64 MHz CPU throughput handles mesh routing without external RTOS. Power-down sleep modes extend battery life in wireless push-button or sensor accessories connected to the gateway.
מומלץ
LED Lighting and Display Controllers
The PIC18F45K20-I/ML works as an LED controller because two CCP modules generate hardware PWM for RGB channels and brightness control, while 25 mA source capability drives LED strings directly without MOSFETs in low-power fixtures. The 10-bit ADC reads ambient sensors for daylight harvesting and color-temperature feedback. The industrial temperature grade suits outdoor luminaire environments. Internal 64 MHz clock eliminates external crystal cost in price-sensitive decorative lighting, while the QFN package enables compact driver board designs.
מומלץ
Small Industrial Control and Monitoring
The PIC18F45K20-I/ML suits small industrial PLC and sensor interface modules because its industrial temperature grade and 5V tolerance survive plant-floor electrical environments. The EUSART supports RS-485 with external transceiver, while MSSP runs SPI sensors and I/O expanders. The 14-channel ADC reads 4-20 mA loops via external shunt resistors and monitors supply voltage. Programmable comparators implement window-detect alarms for limit-switch inputs. The exposed thermal pad supports continuous operation at full peripheral load.
מומלץ
סיכום מוצרים מומלצים
נתוני עזר הנדסיים עבור PIC18F45K20-I/ML — השוואה, הנחיות תכנון ומידע על תאימות.
מדריך בחירה
השוואה עם חלופות
| פרמטר | מוצר זה | PIC18F45K22-I/ML | PIC18F46K20-I/ML | PIC18F44K20-I/ML | PIC18F43K20-I/ML | PIC18F45J11-I/ML |
|---|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 44-QFN (8x8 mm) | 44-QFN (8x8 mm) - same | 44-QFN (8x8 mm) - same | 44-QFN (8x8 mm) - same | 44-QFN (8x8 mm) - same | 44-QFN (8x8 mm) - same |
| Program Memory | 32 KB Flash | 32 KB Flash | 64 KB Flash | 16 KB Flash | 8 KB Flash | 32 KB Flash |
| RAM | 1536 bytes | 1536 bytes | 1536 bytes | 768 bytes | 512 bytes | 1536 bytes |
| Maximum CPU Speed | 64 MHz / 16 MIPS | 64 MHz / 16 MIPS | 64 MHz / 16 MIPS | 64 MHz / 16 MIPS | 64 MHz / 16 MIPS | 48 MHz / 12 MIPS |
| Operating Voltage | 1.8-3.6V (4.2-5.5V extended) | 1.8-3.6V (5.5V extended) | 1.8-3.6V (4.2-5.5V extended) | 1.8-3.6V (4.2-5.5V extended) | 1.8-3.6V (4.2-5.5V extended) | 2.0-3.6V (3.3V only) |
| I/O Pins | 36 | 36 | 36 | 36 | 25 | 34 |
| ADC Channels | 14 x 10-bit | 19 x 10-bit | 14 x 10-bit | 14 x 10-bit | 11 x 10-bit | 13 x 10-bit |
| 5V Tolerant | Yes (extended Vdd) | Yes | Yes | Yes | Yes | No (3.3V only) |
מבדילים עיקריים
- Highest ADC channel count in K20 family at industrial temp grade (לעומתPIC18F43K20-I/ML)
- 5V tolerance for legacy 5V system migration (לעומתPIC18F45J11-I/ML)
- Balanced Flash and RAM for moderate firmware size (לעומתPIC18F46K20-I/ML)
- Established long-term availability for consumer product lifecycles (לעומתPIC18F45K22-I/ML)
הערות תכנון
Place a 100 nF decoupling capacitor as close as possible to every Vdd/Vss pin pair (pins 11/12, 32/33, 42/43) and an additional 10 uF bulk capacitor on the main supply rail. For AVDD (pin 1) and AVSS (pin 8), use a separate 100 nF ceramic plus a ferrite bead from digital Vdd to reduce ADC noise. The exposed thermal pad must be soldered to a continuous ground plane for both thermal dissipation and electrical reference. Estimated: at full 64 MHz operation with all peripherals active, ICC is approximately 10 mA; derate accordingly for battery budgets.
Route the analog inputs (PORTA, PORTF) away from switching signals such as PWM outputs on CCP1/CCP2 and oscillator pins. Use a guarded ground plane with separate analog and digital ground regions joined only at the MCU AVSS pin. Keep ADC traces short and matched in length where possible. The MCLR pin (44) requires a 10 kohm pull-up to Vdd; do not leave it floating or the MCU may randomly enter programming mode. Add a 100 nF cap from MCLR to Vdd for brown-out noise immunity.
Do not assume default oscillator configuration; the K20 powers up with internal 16 MHz HFINTOSC but PLL must be enabled in OSCCON for 64 MHz operation. Avoid the 5V-tolerant analog input misconception: while Vdd can extend to 5.5V, analog input voltages must remain within the specified AVSS-AVDD range. When migrating PIC18F4550 firmware, note the K20 has no native USB peripheral - external PHY or migrate to PIC18F45K50 family for USB. Always check current silicon errata from Microchip before locking firmware; revisions affect ADC and PWM behavior.
Although the K20 is a CMOS microcontroller with modest power dissipation, the 44-QFN exposed pad provides critical thermal relief. Estimated: at 64 MHz full-activity with all peripherals on, the device dissipates approximately 50 mA x 3.3V = 165 mW. With proper ground plane soldering, junction-to-ambient thermal resistance is approximately 30 C/W, resulting in a 5C temperature rise at full load. For QFN-44, follow IPC-7351 land pattern with 0.5 mm pitch pads and ensure the center pad has at least 50% solder fillet coverage for reliable thermal performance.
מידע על תאימות
RoHS and REACH compliant per Microchip product page and Heisener distributor listing. Halogen-free per Microchip environmental compliance documentation. Not AEC-Q100 qualified - this is a commercial/industrial-grade MCU; automotive designs should consider PIC18F46K22-I/ML or PIC18F25K22-I/SO variants.
