PIC18F84J90T-I/PT - 8-Bit 40MHz 16KB Flash MCU | Microchip
MPN: PIC18F84J90T-I/PT ✓ نشطPIC18F84J90T-I/PT نظرة عامة
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.
بدائل مباشرة لـ PIC18F84J90T-I/PT — نفس الحزمة، متوافق دبوس بدبوس. تُستثنى القطع ذات الحزم المختلفة التي تتطلب تعديل PCB.
الطرازات في هذه السلسلة
طرازات من نفس السلسلة متوافقة تمامًا مع PIC18F84J90T-I/PT (نفس عامل الشكل والبصمة) — يختلف في Package, I/O Pins, Operating Temperature, ADC, Core Architecture.
PIC18F84J90-I/PT
✅ بديل مباشرتواصل لمعرفة السعر
عرض ورقة البيانات ←PIC18F8490-I/PT
✅ بديل مباشرتواصل لمعرفة السعر
عرض ورقة البيانات ←PIC18F8410-I/PT
✅ بديل مباشرتواصل لمعرفة السعر
عرض ورقة البيانات ←PIC18F67J90-I/PT
✅ بديل مباشر ⚠️ مواصفات غير مُتحقق منهاتواصل لمعرفة السعر
عرض ورقة البيانات ←PIC18F84J11-I/PT
✅ بديل مباشرتواصل لمعرفة السعر
عرض ورقة البيانات ←PIC18F6722-I/PT
✅ بديل مباشرتواصل لمعرفة السعر
عرض ورقة البيانات ←PIC18F84J90T-I/PT الحدود القصوى والخصائص الكهربائية
| Core | PIC18 8-bit RISC |
| Instruction Width | 16-bit (8K x 16 program memory) |
| عرض ناقل البيانات | 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 |
| درجة حرارة التشغيل | -40C to +85C (Industrial, -I suffix) |
| العلبة | 80-pin TQFP (PT) 12x12 mm |
| نوع التركيب | Surface Mount |
| Series | PIC18J |
| ROM Type | Flash (self-programmable) |
| Lifecycle Stage | Active |
| حالة RoHS | Compliant |
تكوين أطراف PIC18F84J90T-I/PT
| دبوس 1 | RE0 — PORT E bit 0 / LCD segment |
| دبوس 2 | RE1 — PORT E bit 1 / LCD segment |
| دبوس 3 | RE2 — PORT E bit 2 / LCD segment |
| دبوس 4 | RE3 — PORT E bit 3 / LCD segment |
| دبوس 5 | RE4 — PORT E bit 4 / LCD segment |
| دبوس 6 | RE5 — PORT E bit 5 / LCD segment |
| دبوس 7 | RE6 — PORT E bit 6 / LCD segment |
| دبوس 8 | RE7 — PORT E bit 7 / LCD segment |
| دبوس 9 | VDD — Positive supply (4.2-5.5 V) |
| دبوس 10 | VSS — Ground reference |
| دبوس 11 | OSC1 — Crystal/oscillator input |
| دبوس 12 | OSC2 — Crystal/oscillator output |
| دبوس 13 | MCLR — Master clear / programming voltage |
| دبوس 14 | RA0 — PORT A bit 0 / analog AN0 |
| دبوس 15 | RA1 — PORT A bit 1 / analog AN1 |
| دبوس 16 | RA2 — PORT A bit 2 / analog AN2 |
| دبوس 17 | RA3 — PORT A bit 3 / analog AN3 / VREF+ |
| دبوس 18 | RA4 — PORT A bit 4 / analog AN4 |
| دبوس 19 | RA5 — PORT A bit 5 / analog AN5 / VREF- |
| دبوس 20 | AVDD — Analog supply |
| دبوس 21 | AVSS — Analog ground |
| دبوس 22 | RB0 — PORT B bit 0 / INT0 |
| دبوس 23 | RB1 — PORT B bit 1 / INT1 |
| دبوس 24 | RB2 — PORT B bit 2 / INT2 |
| دبوس 25 | RB3 — PORT B bit 3 / INT3 |
| دبوس 26 | RB4 — PORT B bit 4 |
| دبوس 27 | RB5 — PORT B bit 5 |
| دبوس 28 | RB6 — PORT B bit 6 / PGC (programming) |
| دبوس 29 | RB7 — PORT B bit 7 / PGD (programming) |
| دبوس 30 | VDD — Positive supply |
| دبوس 31 | VSS — Ground |
| دبوس 32 | RC0 — PORT C bit 0 |
| دبوس 33 | RC1 — PORT C bit 1 |
| دبوس 34 | RC2 — PORT C bit 2 |
| دبوس 35 | RC3 — PORT C bit 3 / SCL |
| دبوس 36 | RC4 — PORT C bit 4 / SDA |
| دبوس 37 | RC5 — PORT C bit 5 |
| دبوس 38 | RC6 — PORT C bit 6 / TX |
| دبوس 39 | RC7 — PORT C bit 7 / RX |
| دبوس 40 | RD0 — PORT D bit 0 |
| دبوس 41 | RD1 — PORT D bit 1 |
| دبوس 42 | RD2 — PORT D bit 2 |
| دبوس 43 | RD3 — PORT D bit 3 |
| دبوس 44 | RD4 — PORT D bit 4 |
| دبوس 45 | RD5 — PORT D bit 5 |
| دبوس 46 | RD6 — PORT D bit 6 |
| دبوس 47 | RD7 — PORT D bit 7 |
| دبوس 48 | SEG0 — LCD segment 0 |
| دبوس 49 | SEG1 — LCD segment 1 |
| دبوس 50 | SEG2 — LCD segment 2 |
| دبوس 51 | SEG3 — LCD segment 3 |
| دبوس 52 | SEG4 — LCD segment 4 |
| دبوس 53 | SEG5 — LCD segment 5 |
| دبوس 54 | SEG6 — LCD segment 6 |
| دبوس 55 | SEG7 — LCD segment 7 |
| دبوس 56 | SEG8 — LCD segment 8 |
| دبوس 57 | SEG9 — LCD segment 9 |
| دبوس 58 | SEG10 — LCD segment 10 |
| دبوس 59 | SEG11 — LCD segment 11 |
| دبوس 60 | SEG12 — LCD segment 12 |
| دبوس 61 | SEG13 — LCD segment 13 |
| دبوس 62 | SEG14 — LCD segment 14 |
| دبوس 63 | SEG15 — LCD segment 15 |
| دبوس 64 | SEG16 — LCD segment 16 |
| دبوس 65 | SEG17 — LCD segment 17 |
| دبوس 66 | SEG18 — LCD segment 18 |
| دبوس 67 | SEG19 — LCD segment 19 |
| دبوس 68 | COM0 — LCD common 0 |
| دبوس 69 | COM1 — LCD common 1 |
| دبوس 70 | COM2 — LCD common 2 |
| دبوس 71 | COM3 — LCD common 3 |
| دبوس 72 | VLCD1 — LCD charge pump node |
| دبوس 73 | VLCD2 — LCD charge pump node |
| دبوس 74 | VLCD3 — LCD charge pump node |
| دبوس 75 | RF0 — PORT F bit 0 / LCD segment |
| دبوس 76 | RF1 — PORT F bit 1 / LCD segment |
| دبوس 77 | RF2 — PORT F bit 2 / LCD segment |
| دبوس 78 | RF3 — PORT F bit 3 / LCD segment |
| دبوس 79 | RF4 — PORT F bit 4 / LCD segment |
| دبوس 80 | RF5 — PORT F bit 5 / LCD segment |
التطبيقات النموذجية
PIC18F84J90T-I/PT مناسب لـ 7 التطبيقs: 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.
موصى به
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.
موصى به
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.
موصى به
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.
موصى به
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.
موصى به
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.
موصى به
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.
موصى به
ملخص المنتجات الموصى بها
بيانات مرجعية هندسية لـ PIC18F84J90T-I/PT — المقارنة وإرشادات التصميم ومعلومات الامتثال.
دليل الاختيار
المقارنة مع البدائل
| المعامل | هذا المنتج | 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) |
أبرز الفروقات
- Tape-and-reel packaging for high-volume SMT assembly (مقابلPIC18F84J90-I/PT)
- Optimised 16 KB Flash / 1 KB RAM for cost-sensitive metering (مقابلPIC18F8490-I/PT (32 KB Flash / 2 KB RAM))
- Hardware charge-pump LCD driver eliminates external VLCD boost (مقابلPIC18F6722-I/PT (older non-J LCD PIC18))
ملاحظات التصميم
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.
معلومات الامتثال
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).
