PIC18F8621-I/PT - 8-bit 40MHz 64KB Flash MCU 80-TQFP | Microchip
MPN: PIC18F8621-I/PT ✓ NakahandaPIC18F8621-I/PT Ulas
What is an 8-bit PIC microcontroller? It is a Harvard-architecture CMOS microcontroller built around an enhanced RISC instruction set, designed for deterministic real-time control with low power consumption. Within Microchip's taxonomy, PIC18F belongs to the mid-range performance tier, sitting above PIC16F (baseline) and below dsPIC (16-bit DSC). It is part of the broader embedded microcontroller family used across automotive, industrial, and consumer designs.
Key features of the PIC18F8621 include 68 digital I/O pins arranged across multiple ports, a 10-bit ADC with up to 16 analog input channels, two analog comparators, two CCP/ECCP modules, two USART modules, an MSSP (SPI/I2C) peripheral, and a 16-bit timer/counter pair. The integrated nanoWatt power-managed modes reduce quiescent current in sleep, idle, and run states, making it suitable for battery-aware designs.
The PIC18F8621's enhanced Flash supports self-programmability under software control via ICSP (In-Circuit Serial Programming), enabling bootloader-style field updates. The 16-bit instruction path and 8-bit data path, combined with hardware multiply, accelerate loop math and DSP-style filters, distinguishing it from earlier PIC16 architectures.
Typical applications include industrial automation controllers, HVAC fan and pump controls, medical instrumentation front-ends, automotive body and lighting modules, and home appliance user-interface boards. The wide I/O count and 16-channel ADC suit multi-sensor systems.
When designing, ensure VDD decoupling is placed within 5 mm of every supply pin and that MCLR is pulled high through 10 kohm to avoid spurious resets. Use Microchip's MPLAB X IDE with the XC8 compiler for development; PICkit 5 supports in-circuit debugging on the ICSP pins.
This page synthesizes distributor pricing, same-brand drop-in alternatives (including automotive-grade and E-temperature variants), and practical design notes not found in the standalone manufacturer datasheet.
Mga alternatibo na pwedeng ilagay na PIC18F8621-I/PT — parehas na package, pin-to-pin na katugmang. Hindi kasama ang mga bahagi ng iba't-ibang package na nangangailangan ng pagpapaayos ng PCB.
Variante sa Seri na ito
Katulad na modelo sa serye na katugma sa pagpasok PIC18F8621-I/PT (parehas na form factor at footprint) — pagkakaiba sa Package, Timers, Core Architecture, Operating Temperature, ADC.
PIC18F8621-E/PT
✅ Drop-In📋 Alternatibo na Reference (hindi sa katalogo)
PIC18F8622-I/PT
✅ Drop-InMagkontak para sa presyo
Tingnan ang Datasheet →PIC18F8620-I/PT
✅ Drop-In📋 Alternatibo na Reference (hindi sa katalogo)
PIC18F8525-I/PT
✅ Drop-InMagkontak para sa presyo
Tingnan ang Datasheet →PIC18F8520-I/PT
✅ Drop-InMagkontak para sa presyo
Tingnan ang Datasheet →PIC18F86K90-I/PT
✅ Drop-In ⚠️ Mga Talaan Hindi NaiwerikmoMagkontak para sa presyo
Tingnan ang Datasheet →PIC18F85K22-I/PT
✅ Drop-In ⚠️ Mga Talaan Hindi Naiwerikmo📋 Alternatibo na Reference (hindi sa katalogo)
PIC18F8621-I/PT Mga Pinakamataas na Rating at Electrical Characteristics
| Core Architecture | PIC18F (8-bit enhanced RISC) |
| Maksimum na Taktiko ng Oras | 40 MHz |
| Program Memory (Flash) | 64 KB (32K x 16) |
| Data RAM | 3,840 bytes |
| EEPROM | 1,024 bytes |
| ADC | 10-bit, up to 16 channels |
| Digital I/O Pins | 68 |
| Packhaging | 80-pin TQFP (PT) 12x12 mm |
| Hanay ng Temperature na Operasyon | -40C to +85C (Industrial, I suffix) |
| Supply Voltage (VDD) | 2.0 V to 5.5 V |
| USART Modules | 2 |
| MSSP (SPI/I2C) | 1 |
| CCP/ECCP Modules | 2 CCP + 1 ECCP |
| Analog Comparators | 2 |
| Timers | 16-bit Timer1/3 plus Timer0/2 |
| Self-Programming | ICSP / bootloader capable |
| Tindminan RoHS | Compliant |
| Uri ng Pagpapasok | Surface Mount |
Pin Configuration ng PIC18F8621-I/PT
| Pin 1 | RG4 — PORTG I/O pin 4 (digital I/O) |
| Pin 2 | RG3 — PORTG I/O pin 3 |
| Pin 3 | RG2 — PORTG I/O pin 2 |
| Pin 4 | RG1 — PORTG I/O pin 1 |
| Pin 5 | RG0 — PORTG I/O pin 0 |
| Pin 6 | RF7 — PORTF I/O pin 7 |
| Pin 7 | RF6 — PORTF I/O pin 6 / digital only on this family |
| Pin 8 | RF5 — PORTF I/O pin 5 / analog AN11 |
| Pin 9 | RF4 — PORTF I/O pin 4 / analog AN10 |
| Pin 10 | RF3 — PORTF I/O pin 3 / analog AN9 |
| Pin 11 | VDD — Positive supply (2.0-5.5 V) |
| Pin 12 | VSS — Ground reference |
| Pin 13 | OSC1 — Crystal/clock input |
| Pin 14 | OSC2 — Crystal/clock output |
| Pin 15 | RC0 — PORTC I/O / analog AN12 |
| Pin 16 | RC1 — PORTC I/O / analog AN13 / CCP2 |
| Pin 17 | RC2 — PORTC I/O / analog AN14 / CCP1 |
| Pin 18 | RC3 — PORTC I/O / analog AN15 / SCL |
| Pin 19 | RD0 — PORTD I/O / PSP data 0 |
| Pin 20 | RD1 — PORTD I/O / PSP data 1 |
| Pin 21 | RD2 — PORTD I/O / PSP data 2 |
| Pin 22 | RD3 — PORTD I/O / PSP data 3 |
| Pin 23 | RC4 — PORTC I/O / SDA |
| Pin 24 | RC5 — PORTC I/O / SDO |
| Pin 25 | RC6 — PORTC I/O / TX1 |
| Pin 26 | RC7 — PORTC I/O / RX1 |
| Pin 27 | RD4 — PORTD I/O / PSP data 4 / SDI |
| Pin 28 | RD5 — PORTD I/O / PSP data 5 / SDO |
| Pin 29 | RD6 — PORTD I/O / PSP data 6 / SCK |
| Pin 30 | RD7 — PORTD I/O / PSP data 7 / SS |
| Pin 31 | VSS — Ground reference |
| Pin 32 | VDD — Positive supply |
| Pin 33 | RB0 — PORTB I/O / INT0 / AN12 |
| Pin 34 | RB1 — PORTB I/O / INT1 / AN8 |
| Pin 35 | RB2 — PORTB I/O / INT2 / AN9 |
| Pin 36 | RB3 — PORTB I/O / INT3 / CCP2 |
| Pin 37 | RB4 — PORTB I/O / KBI0 |
| Pin 38 | RB5 — PORTB I/O / KBI1 / PGM |
| Pin 39 | RB6 — PORTB I/O / KBI2 / PGC (ICSP clock) |
| Pin 40 | RB7 — PORTB I/O / KBI3 / PGD (ICSP data) |
| Pin 41 | RE0 — PORTE I/O / AN5 / RD (PSP) |
| Pin 42 | RE1 — PORTE I/O / AN6 / WR (PSP) |
| Pin 43 | RE2 — PORTE I/O / AN7 / CS (PSP) |
| Pin 44 | RE3 — PORTE I/O / AN8 (digital only on this pin) |
| Pin 45 | RE4 — PORTE I/O / AN9 (digital only on this pin) |
| Pin 46 | RE5 — PORTE I/O / AN10 (digital only on this pin) |
| Pin 47 | RE6 — PORTE I/O / AN11 (digital only on this pin) |
| Pin 48 | RE7 — PORTE I/O / AN12 (digital only on this pin) |
| Pin 49 | RA0 — PORTA I/O / AN0 |
| Pin 50 | RA1 — PORTA I/O / AN1 |
| Pin 51 | RA2 — PORTA I/O / AN2 / VREF- |
| Pin 52 | RA3 — PORTA I/O / AN3 / VREF+ |
| Pin 53 | RA4 — PORTA I/O / T0CKI |
| Pin 54 | RA5 — PORTA I/O / AN4 / SS |
| Pin 55 | RF0 — PORTF I/O / AN5 |
| Pin 56 | RF1 — PORTF I/O / AN6 |
| Pin 57 | RF2 — PORTF I/O / AN7 |
| Pin 58 | AVDD — Analog supply |
| Pin 59 | AVSS — Analog ground |
| Pin 60 | RH0 — PORTH I/O / AN23 |
| Pin 61 | RH1 — PORTH I/O / AN22 |
| Pin 62 | RH2 — PORTH I/O / AN21 |
| Pin 63 | RH3 — PORTH I/O / AN20 |
| Pin 64 | RH4 — PORTH I/O / AN19 |
| Pin 65 | RH5 — PORTH I/O / AN18 |
| Pin 66 | RH6 — PORTH I/O / AN17 |
| Pin 67 | RH7 — PORTH I/O / AN16 |
| Pin 68 | VDD — Positive supply |
| Pin 69 | VSS — Ground reference |
| Pin 70 | RJ0 — PORTJ I/O |
| Pin 71 | RJ1 — PORTJ I/O |
| Pin 72 | RJ2 — PORTJ I/O |
| Pin 73 | RJ3 — PORTJ I/O |
| Pin 74 | RJ4 — PORTJ I/O |
| Pin 75 | RJ5 — PORTJ I/O |
| Pin 76 | RJ6 — PORTJ I/O |
| Pin 77 | RJ7 — PORTJ I/O |
| Pin 78 | RK0 — PORTK I/O |
| Pin 79 | RK1 — PORTK I/O |
| Pin 80 | MCLR — Master Clear (reset, active low) |
Tipikal na mga Gamit
PIC18F8621-I/PT ay nararapat para sa 6 aplikasyons: Industrial Automation Controllers, HVAC Fan and Pump Controllers, Medical Instrumentation Front-Ends, Automotive Body and Lighting Modules, Home Appliance User-Interface Boards, Data Acquisition and Logging Systems.
Industrial Automation Controllers
The PIC18F8621-I/PT fits industrial automation because its 68 I/O pins aggregate multiple sensor and actuator interfaces on a single MCU, eliminating the need for I/O expanders. The 16-channel 10-bit ADC samples analog process variables at up to 100 ksps, sufficient for PID-loop pressure, flow, and temperature monitoring. Hardware USART and MSSP peripherals support Modbus RTU over RS-485 and SPI-based motor controller links. Estimated: at 40 MHz with all peripherals active, the device draws ~25 mA, manageable for cabinet-mounted designs without active cooling.
Inirekomenda
HVAC Fan and Pump Controllers
The PIC18F8621-I/PT's ECCP module produces hardware-PWM signals for triac or IGBT driver stages controlling variable-speed fans and pumps, reducing BOM cost versus external PWM generators. The dual 16-bit timers capture tachometer pulses from Hall sensors with 25 ns resolution, enabling closed-loop RPM regulation. With 64 KB of Flash, designers can run adaptive control algorithms, soft-start ramps, and fault logging without external memory. The 2.0-5.5 V VDD range simplifies 24 VAC-derived DC-rail designs common in HVAC equipment.
Inirekomenda
Medical Instrumentation Front-Ends
The PIC18F8621-I/PT suits medical front-ends such as blood-pressure monitors, infusion pumps, and patient-interface panels because the 10-bit ADC with 16 channels captures multiple physiological signals simultaneously. Hardware ECCP can drive PWM-modulated excitation for bridge-type pressure transducers, while the integrated comparators trigger on threshold crossings without software polling. With 3840 B of RAM, designers can buffer sample windows for FIR-style filtering, and self-programming Flash allows safe field firmware updates under regulated change-control processes.
Inirekomenda
Automotive Body and Lighting Modules
For automotive body controllers, the PIC18F8621-I/PT drives multi-channel LED tail-light assemblies via hardware PWM (ECCP), supports LIN-slave communication through the USART plus external LIN transceiver, and aggregates multiple switch inputs across 68 I/O pins. The 80-TQFP package withstands automotive under-hood thermal swings when the E-temp -40 to +125 C variant is selected. nanoWatt sleep mode reduces quiescent current during parked-vehicle standby, helping meet typical 100 uA body-module targets. Production builds typically select the PIC18F86K90 upgrade for AEC-Q100 compliance.
Inirekomenda
Home Appliance User-Interface Boards
In washing machines, dishwashers, and induction cooktops, the PIC18F8621-I/PT serves as the user-interface controller driving 7-segment or LCD displays, touch-key scanning, and rotary-encoder inputs. The MSSP (SPI) bus drives segment drivers and external EEPROM for settings storage, while the ECCP generates variable-frequency tones for piezo buzzers. With 64 KB Flash, manufacturers can ship multiple SKUs from one hardware platform by selecting firmware variants at production. Low-power sleep modes keep standby consumption within Energy Star limits.
Inirekomenda
Data Acquisition and Logging Systems
For portable data loggers and remote telemetry units, the PIC18F8621-I/PT combines a 16-channel 10-bit ADC, dual USART for sensor-bus and modem links, and 3840 B RAM for circular sample buffers. The MSSP can read SD-card controllers for bulk storage, and self-programming Flash allows OTA-style firmware updates. nanoWatt idle mode keeps battery drain under 5 uA between sample bursts, suiting solar-powered remote installations. Pairing with an external RTC and SD card provides weeks of autonomous logging without processor intervention.
Inirekomenda
Buod ng mga Inirekomendang Produkto
Impormasyon ng Talumpati sa Engineering for PIC18F8621-I/PT — ikabit, gabay sa disenyo, at impormasyon ng pagsunod sa kautusan.
Paunawang Hanapin
Ikabit sa Mga Alternatibo
| Parametro | Ito ang Producto | PIC18F8621-E/PT | PIC18F8622-I/PT | PIC18F8620-I/PT | PIC18F8525-I/PT | PIC18F86K90-I/PT |
|---|---|---|---|---|---|---|
| Package | 80-TQFP (PT) 12x12 mm | 80-TQFP (PT) - same | 80-TQFP (PT) - same | 80-TQFP (PT) - same | 80-TQFP (PT) - same | 80-TQFP (PT) - same |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Flash Memory | 64 KB | 64 KB | 96 KB (+50%) | 64 KB | 48 KB (-25%) | 32 KB (-50%) |
| RAM | 3840 bytes | 3840 bytes | 4352 bytes | 3840 bytes | 3840 bytes | 2048 bytes |
| EEPROM | 1024 bytes | 1024 bytes | 1024 bytes | 1024 bytes | 1024 bytes | 1024 bytes |
| Max Clock Frequency | 40 MHz | 40 MHz | 40 MHz | 40 MHz | 40 MHz | 64 MHz (+60%) |
| Operating Temperature | -40C to +85C | -40C to +125C | -40C to +85C | -40C to +85C | -40C to +85C | -40C to +85C |
| ADC Resolution | 10-bit | 10-bit | 10-bit | 10-bit | 10-bit | 12-bit |
Pangunahing mga Pagkakaiba
- Most Flash/RAM in the 64/80-pin PIC18F base family at this speed (kumpara saPIC18F8525-I/PT)
- Direct upgrade path with same footprint and zero firmware porting (kumpara saPIC18F8622-I/PT)
- Extended temperature without re-certifying firmware (kumpara saPIC18F8621-I/PT (vs -E variant))
Talaan ng Disenyo
Place a 100 nF decoupling capacitor within 5 mm of every VDD pin (11, 32, 68) and a 10 uF bulk capacitor near the 80-TQFP supply entrance. Add a 10 uF + 100 nF pair on AVDD/AVSS (pins 58/59) to keep ADC noise below 1 LSB. Route VSS as a star ground with separate analog and digital returns joined at the device pin 12 or 31. Keep crystal traces (OSC1/OSC2) short and surrounded by a guard ring tied to ground.
MCLR (pin 80) MUST be pulled high through a 10 kohm resistor to VDD; a floating MCLR causes spurious resets. For ICSP, route PGC (RB6) and PGD (RB7) as a 2-wire bus with no series resistors larger than 100 ohm. Do not load RB5/RB6/RB7 with >20 pF when in-circuit debugging, or programming will fail. The /PT suffix denotes lead-free matte-tin plating - verify your reflow profile matches JEDEC J-STD-020.
Use the nanoWatt sleep modes (SLEEP instruction plus idle/peripheral disable) to drop quiescent current below 5 uA in battery-backed designs. The PIC18F8621 supports RC_IDLE, PRI_IDLE, SEC_RUN, and SEC_IDLE modes selectable in the OSCCON register. Estimated: at 5 V with all peripherals off, sleep current is ~0.2 uA typical and ~5 uA max, suiting RTC-coin-cell designs. For high-noise industrial environments, add a ferrite bead on VDD and a TVS diode such as SMAJ5.0A on MCLR.
Impormasyon ng Pagsunod sa Kautusan
RoHS-compliant lead-free matte-tin finish per Microchip product page. The base PIC18F8621 family is not AEC-Q100 qualified; PIC18F86K90 is the recommended AEC-Q100 alternative in the same 80-TQFP footprint.
