PIC18F84J90T-I/PT - 8-Bit 40MHz 16KB Flash MCU | Microchip
MPN: PIC18F84J90T-I/PT ✓ Hoạt độngPIC18F84J90T-I/PT Tóm tắt
A microcontroller (MCU) is a single-chip computer that integrates a CPU core, program memory (Flash/ROM), working memory (RAM), and a rich set of peripherals such as timers, ADC, communication interfaces, and I/O pins. The PIC18 family is built on an enhanced Harvard RISC architecture, where the 8-bit data bus is paired with a separate, wider program-memory bus for instructions. Within the PIC18 hierarchy, the J-series parts add large I/O counts and LCD drive capability, positioning the PIC18F84J90 in the LCD PIC18F subfamily intended for human-interface designs.
Key features include 16 KB self-programmable Flash, 1 KB RAM, 70 I/O pins, hardware LCD driver, 10-bit ADC channels, multiple USART/SPI/I2C peripherals, and nanoWatt power management. The 16-bit instruction word (8K x 16) enables compact C code and larger constant tables. The wide I/O count (70 pins) and large pin-count package make the part suitable for color TFT or segment LCD panels.
Architecturally the part combines an 8-bit RISC core with a 16-bit program path and hardware multiplier, supporting C-optimized instruction set including multiply and hardware divide assist. The LCD module, ADC, and PWM peripherals share DMA-capable I/O allowing deterministic refresh of large graphical displays without CPU intervention.
Typical applications include handheld meters, thermostats, home security panels, and power/gas/water metering. The integrated LCD controller with dedicated charge-pump makes the PIC18F84J90 ideal for battery-powered utility metering with graphical or segment displays.
When designing, verify that the 4.2 V minimum supply (J-series constraint) is compatible with your power rail; K-series parts accept 1.8-5.5 V. Decouple VDD/VSS with 100 nF ceramic placed within 3 mm of each supply pin group.
This page synthesizes distributor pricing, parametric drop-in alternatives, and practical design notes curated for the PIC18F84J90 family - a synthesis not found in the manufacturer datasheet alone.
Bộ thay thế dễ dàng lắp đặt cho PIC18F84J90T-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 PIC18F84J90T-I/PT (cùng hình factor và footprint) — khác nhau ở Package, I/O Pins, Operating Temperature, ADC, Core Architecture.
PIC18F84J90-I/PT
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →PIC18F8490-I/PT
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →PIC18F8410-I/PT
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →PIC18F67J90-I/PT
✅ Drop-In ⚠️ Thông số chưa được xác minhLiên hệ để biết giá
Xem tài liệu →PIC18F84J11-I/PT
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →PIC18F6722-I/PT
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →PIC18F84J90T-I/PT Tỷ lệ tối đa & tính chất điện
| Core | PIC18 8-bit RISC |
| Instruction Width | 16-bit (8K x 16 program memory) |
| Bề rộng đường dữ liệu | 8-bit |
| Maximum Clock Speed | 40 MHz |
| Program Memory (Flash) | 16 KB (8K x 16) |
| RAM | 1 KB (1024 bytes) |
| I/O Pins | 70 |
| Supply Voltage (VDD) | 4.2 V to 5.5 V |
| Nhiệt độ hoạt động | -40C to +85C (Industrial, -I suffix) |
| Hộp | 80-pin TQFP (PT) 12x12 mm |
| Kiểu lắp đặt | Surface Mount |
| Series | PIC18J |
| ROM Type | Flash (self-programmable) |
| Lifecycle Stage | Active |
| Trạng thái RoHS | Compliant |
Cấu hình chân PIC18F84J90T-I/PT
| Chân 1 | RE0 — PORT E bit 0 / LCD segment |
| Chân 2 | RE1 — PORT E bit 1 / LCD segment |
| Chân 3 | RE2 — PORT E bit 2 / LCD segment |
| Chân 4 | RE3 — PORT E bit 3 / LCD segment |
| Chân 5 | RE4 — PORT E bit 4 / LCD segment |
| Chân 6 | RE5 — PORT E bit 5 / LCD segment |
| Chân 7 | RE6 — PORT E bit 6 / LCD segment |
| Chân 8 | RE7 — PORT E bit 7 / LCD segment |
| Chân 9 | VDD — Positive supply (4.2-5.5 V) |
| Chân 10 | VSS — Ground reference |
| Chân 11 | OSC1 — Crystal/oscillator input |
| Chân 12 | OSC2 — Crystal/oscillator output |
| Chân 13 | MCLR — Master clear / programming voltage |
| Chân 14 | RA0 — PORT A bit 0 / analog AN0 |
| Chân 15 | RA1 — PORT A bit 1 / analog AN1 |
| Chân 16 | RA2 — PORT A bit 2 / analog AN2 |
| Chân 17 | RA3 — PORT A bit 3 / analog AN3 / VREF+ |
| Chân 18 | RA4 — PORT A bit 4 / analog AN4 |
| Chân 19 | RA5 — PORT A bit 5 / analog AN5 / VREF- |
| Chân 20 | AVDD — Analog supply |
| Chân 21 | AVSS — Analog ground |
| Chân 22 | RB0 — PORT B bit 0 / INT0 |
| Chân 23 | RB1 — PORT B bit 1 / INT1 |
| Chân 24 | RB2 — PORT B bit 2 / INT2 |
| Chân 25 | RB3 — PORT B bit 3 / INT3 |
| Chân 26 | RB4 — PORT B bit 4 |
| Chân 27 | RB5 — PORT B bit 5 |
| Chân 28 | RB6 — PORT B bit 6 / PGC (programming) |
| Chân 29 | RB7 — PORT B bit 7 / PGD (programming) |
| Chân 30 | VDD — Positive supply |
| Chân 31 | VSS — Ground |
| Chân 32 | RC0 — PORT C bit 0 |
| Chân 33 | RC1 — PORT C bit 1 |
| Chân 34 | RC2 — PORT C bit 2 |
| Chân 35 | RC3 — PORT C bit 3 / SCL |
| Chân 36 | RC4 — PORT C bit 4 / SDA |
| Chân 37 | RC5 — PORT C bit 5 |
| Chân 38 | RC6 — PORT C bit 6 / TX |
| Chân 39 | RC7 — PORT C bit 7 / RX |
| Chân 40 | RD0 — PORT D bit 0 |
| Chân 41 | RD1 — PORT D bit 1 |
| Chân 42 | RD2 — PORT D bit 2 |
| Chân 43 | RD3 — PORT D bit 3 |
| Chân 44 | RD4 — PORT D bit 4 |
| Chân 45 | RD5 — PORT D bit 5 |
| Chân 46 | RD6 — PORT D bit 6 |
| Chân 47 | RD7 — PORT D bit 7 |
| Chân 48 | SEG0 — LCD segment 0 |
| Chân 49 | SEG1 — LCD segment 1 |
| Chân 50 | SEG2 — LCD segment 2 |
| Chân 51 | SEG3 — LCD segment 3 |
| Chân 52 | SEG4 — LCD segment 4 |
| Chân 53 | SEG5 — LCD segment 5 |
| Chân 54 | SEG6 — LCD segment 6 |
| Chân 55 | SEG7 — LCD segment 7 |
| Chân 56 | SEG8 — LCD segment 8 |
| Chân 57 | SEG9 — LCD segment 9 |
| Chân 58 | SEG10 — LCD segment 10 |
| Chân 59 | SEG11 — LCD segment 11 |
| Chân 60 | SEG12 — LCD segment 12 |
| Chân 61 | SEG13 — LCD segment 13 |
| Chân 62 | SEG14 — LCD segment 14 |
| Chân 63 | SEG15 — LCD segment 15 |
| Chân 64 | SEG16 — LCD segment 16 |
| Chân 65 | SEG17 — LCD segment 17 |
| Chân 66 | SEG18 — LCD segment 18 |
| Chân 67 | SEG19 — LCD segment 19 |
| Chân 68 | COM0 — LCD common 0 |
| Chân 69 | COM1 — LCD common 1 |
| Chân 70 | COM2 — LCD common 2 |
| Chân 71 | COM3 — LCD common 3 |
| Chân 72 | VLCD1 — LCD charge pump node |
| Chân 73 | VLCD2 — LCD charge pump node |
| Chân 74 | VLCD3 — LCD charge pump node |
| Chân 75 | RF0 — PORT F bit 0 / LCD segment |
| Chân 76 | RF1 — PORT F bit 1 / LCD segment |
| Chân 77 | RF2 — PORT F bit 2 / LCD segment |
| Chân 78 | RF3 — PORT F bit 3 / LCD segment |
| Chân 79 | RF4 — PORT F bit 4 / LCD segment |
| Chân 80 | RF5 — PORT F bit 5 / LCD segment |
Ứng dụng tiêu biểu
PIC18F84J90T-I/PT phù hợp cho 7 Áp dụngs: Handheld Utility Meters (Electric/Gas/Water), Programmable Thermostats, Home Security Control Panels, Industrial Process Indicator / Data Logger, Medical Infusion / Diagnostic Devices (LCD UI), Automotive Aftermarket Gauges & Accessories, Consumer Appliance HMIs (Washers/Ovens/Coffee Machines).
Handheld Utility Meters (Electric/Gas/Water)
The PIC18F84J90T-I/PT is purpose-built for battery-powered metering. Its integrated LCD controller with internal charge pump drives up to 192 segments directly without an external driver IC, while the 4.2-5.5 V supply supports single-cell Li or two-cell alkaline packs through a boost converter. The 1 KB RAM holds billing-cycle tables, and the 10 MIPS throughput handles segmented display refresh, ADC sampling of current sensors, and tamper detection simultaneously. The 70 I/O pins expose multiple UART channels for AMR (automatic meter reading) modules and pulse inputs for mechanical meter interfaces.
Được đề xuất
Programmable Thermostats
Residential and commercial thermostats rely on segment or dot-matrix LCDs for temperature readouts, schedule icons, and humidity graphs. The PIC18F84J90T-I/PT's hardware LCD driver with variable bias eliminates the cost of an external HT1621 or similar, while 70 I/O accommodate multiple NTC thermistor inputs, relay triac controls for HVAC stages, and rotary encoder or capacitive touch keys. The 16 KB Flash fits 7-day programmable schedules with hysteresis logic, and the nanoWatt power modes extend battery life during brownout events.
Được đề xuất
Home Security Control Panels
Security panels integrate keypad entry, PIR sensors, door/window contacts, sirens, and LCD status displays. The PIC18F84J90T-I/PT delivers 70 I/O to wire multiple zones directly without I/O expanders, while the LCD segment driver shows zone status, arm/disarm state, and event logs. Hardware AES not present, but software AES fits in 16 KB Flash for encrypted wireless sensor links. The -40C to +85C industrial range ensures reliable operation in unheated garages and outdoor enclosures across seasons.
Được đề xuất
Industrial Process Indicator / Data Logger
Process indicators display tank level, pressure, or temperature from 4-20 mA loops and log data to non-volatile memory. The PIC18F84J90T-I/PT's 10-bit ADC and 70 I/O accept multiple analog inputs plus digital switch contacts, while the segment LCD reports real-time readings. For data logging, external EEPROM or FRAM connects over I2C, and the 16 KB Flash holds Modbus RTU or HART-like stack firmware. Wide -40C to +85C operation tolerates panel-mount enclosures with poor ventilation.
Được đề xuất
Medical Infusion / Diagnostic Devices (LCD UI)
Battery-powered medical infusion pumps, glucose meters, and point-of-care diagnostics all benefit from the PIC18F84J90T-I/PT's integrated segment LCD driver and 70 I/O for keypad, motor drive, and sensor interfaces. The 4.2-5.5 V supply accommodates two AA cells with boost regulation. The 40 MHz core executes PID loop control for fluid delivery at deterministic intervals, while the hardware LCD refresh runs without CPU intervention, freeing MIPS for safety monitoring.
Được đề xuất
Automotive Aftermarket Gauges & Accessories
Aftermarket digital gauges (boost, oil pressure, EGT) and accessory controllers use segment LCDs to display real-time engine data. The PIC18F84J90T-I/PT handles CAN or LIN messages via software bit-banging (no hardware CAN), drives the LCD directly, and reads multiple analog channels for sensor inputs. Industrial -40C to +85C operation covers most cabin and engine-bay environments, though under-hood installations should specify AEC-Q100 parts such as PIC18F66K90T-I/PT for full automotive qualification.
Được đề xuất
Consumer Appliance HMIs (Washers/Ovens/Coffee Machines)
White-goods HMIs combine segment or dot-matrix LCDs, capacitive touch, rotary encoders, and triac-driven motor/relay controls. The PIC18F84J90T-I/PT's 70 I/O drive multiple triac optocouplers, accept keypad matrix scans, and refresh segment LCDs for cycle status. The 4.2-5.5 V supply operates directly from rectified 5 V standby rails. Hardware timers support zero-cross detection for triac dimming in ovens and coffee machines.
Được đề xuất
Tóm tắt các sản phẩm được đề xuất
Dữ liệu tham khảo kỹ thuật cho PIC18F84J90T-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 | PIC18F84J90-I/PT | PIC18F8490-I/PT | PIC18F8410-I/PT | PIC18F84J11-I/PT | PIC18F6722-I/PT |
|---|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 80-pin TQFP (PT) 12x12 mm | 80-pin TQFP (PT) 12x12 mm | 80-pin TQFP (PT) 12x12 mm | 80-pin TQFP (PT) 12x12 mm | 80-pin TQFP (PT) 12x12 mm | 80-pin TQFP (PT) 12x12 mm |
| Core | PIC18 8-bit RISC | PIC18 8-bit RISC | PIC18 8-bit RISC | PIC18 8-bit RISC | PIC18 8-bit RISC | PIC18 8-bit RISC |
| Flash Memory | 16 KB (8K x 16) | 16 KB (8K x 16) | 32 KB (16K x 16) | 32 KB (16K x 16) | 32 KB (16K x 16) | 128 KB |
| RAM | 1 KB | 1 KB | 2 KB | 2 KB | 2 KB | 3.8 KB |
| I/O Pins | 70 | 70 | 70 | 70 | 70 | 70 |
| Maximum Clock | 40 MHz | 40 MHz | 40 MHz | 40 MHz | 40 MHz | 40 MHz |
| Supply Voltage | 4.2 V to 5.5 V | 4.2 V to 5.5 V | 4.2 V to 5.5 V | 4.2 V to 5.5 V | 4.2 V to 5.5 V | 4.2 V to 5.5 V |
| Integrated LCD Driver | Yes (segment + charge pump) | Yes | Yes | Yes | Yes | Yes (PIC18 non-J) |
Bảo phân biệt quan trọng
- Tape-and-reel packaging for high-volume SMT assembly (vsPIC18F84J90-I/PT)
- Optimised 16 KB Flash / 1 KB RAM for cost-sensitive metering (vsPIC18F8490-I/PT (32 KB Flash / 2 KB RAM))
- Hardware charge-pump LCD driver eliminates external VLCD boost (vsPIC18F6722-I/PT (older non-J LCD PIC18))
Ghi chú thiết kế
The PIC18F84J90T-I/PT requires 4.2 V minimum supply. Designers migrating from K-series parts (1.8 V minimum) must add a boost regulator for 3.3 V-only rails. Decouple every VDD/VSS pair with 100 nF X7R ceramic placed within 3 mm of the pin. Bulk decoupling of 10 uF tantalum near the IC handles the LCD charge-pump load transients during display refresh cycles.
The 80-pin TQFP (12x12 mm) has a 0.5 mm pitch. Use 4 mil trace/space rules with micro-vias to fan out from inner pads; keep all traces at least 0.2 mm from package edges to avoid solder bridges. Place the IC on the top side with decoupling on the opposite side using short vias. Reserve a 4-layer stack-up with a continuous ground plane beneath the part for EMI suppression.
Do not connect AVDD/AVSS to the same net as digital VDD/VSS - the PIC18F84J90 needs separate analog/digital supplies for ADC accuracy. The MCLR pin must have a 10 kohm pull-up to VDD; floating MCLR causes spurious resets. Programming pins RB6/PGC and RB7/PGD must not be pulled low at startup or the part enters debug mode inadvertently. Always configure the watchdog timer in software to recover from firmware lockups.
Thông tin tuân thủ
RoHS compliant per Microchip product page. Not AEC-Q100 qualified; use PIC18F66K90T-I/PT for automotive under-hood applications. Industrial -40C to +85C operating range (-I suffix).
