PIC18F84J90T-I/PT - 8-Bit 40MHz 16KB Flash MCU | Microchip
Référence : PIC18F84J90T-I/PT ✓ Actif| Qté | Prix unitaire | Total |
|---|---|---|
| 1 | $7.65 | $7,65 |
| 10 | $7.1 | $71,00 |
| 100 | $6.45 | $645,00 |
| 500 | $5.92 | $2 960,00 |
| 1 000 | $5.4 | $5 400,00 |
PIC18F84J90T-I/PT Présentation
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.
Alternatives de remplacement direct pour PIC18F84J90T-I/PT — même boîtier, compatible broche à broche. Les références à boîtier différent nécessitant une retouche du PCB sont exclues.
Variantes de cette série
Modèles de la même série directement compatibles avec PIC18F84J90T-I/PT (même facteur de forme et même empreinte) — différant par Package, I/O Pins, Operating Temperature, ADC, Core Architecture.
Outil de comparaison rapide — sélectionnez des références alternatives pour une comparaison côte à côte :
PIC18F84J90-I/PT
✅ Remplacement direct✓ En stock
$3.1 / unité
Voir la fiche technique →PIC18F8490-I/PT
✅ Remplacement direct✓ En stock
$5.55 / unité
Voir la fiche technique →PIC18F8410-I/PT
✅ Remplacement direct✓ En stock
$6.85 / unité
Voir la fiche technique →PIC18F67J90-I/PT
✅ Remplacement direct ⚠️ Spécifications non vérifiées✓ En stock
$5.64 / unité
Voir la fiche technique →PIC18F84J11-I/PT
✅ Remplacement direct✓ En stock
$4.2 / unité
Voir la fiche technique →PIC18F6722-I/PT
✅ Remplacement direct✓ En stock
$5.32 / unité
Voir la fiche technique →PIC18F84J90T-I/PT Valeurs maximales et caractéristiques électriques
| Core | PIC18 8-bit RISC |
| Instruction Width | 16-bit (8K x 16 program memory) |
| Largeur du bus de données | 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 |
| Température de fonctionnement | -40C to +85C (Industrial, -I suffix) |
| Boîtier | 80-pin TQFP (PT) 12x12 mm |
| Type de montage | Surface Mount |
| Series | PIC18J |
| ROM Type | Flash (self-programmable) |
| Lifecycle Stage | Active |
| Statut RoHS | Compliant |
Configuration des broches de PIC18F84J90T-I/PT
| Broche 1 | RE0 — PORT E bit 0 / LCD segment |
| Broche 2 | RE1 — PORT E bit 1 / LCD segment |
| Broche 3 | RE2 — PORT E bit 2 / LCD segment |
| Broche 4 | RE3 — PORT E bit 3 / LCD segment |
| Broche 5 | RE4 — PORT E bit 4 / LCD segment |
| Broche 6 | RE5 — PORT E bit 5 / LCD segment |
| Broche 7 | RE6 — PORT E bit 6 / LCD segment |
| Broche 8 | RE7 — PORT E bit 7 / LCD segment |
| Broche 9 | VDD — Positive supply (4.2-5.5 V) |
| Broche 10 | VSS — Ground reference |
| Broche 11 | OSC1 — Crystal/oscillator input |
| Broche 12 | OSC2 — Crystal/oscillator output |
| Broche 13 | MCLR — Master clear / programming voltage |
| Broche 14 | RA0 — PORT A bit 0 / analog AN0 |
| Broche 15 | RA1 — PORT A bit 1 / analog AN1 |
| Broche 16 | RA2 — PORT A bit 2 / analog AN2 |
| Broche 17 | RA3 — PORT A bit 3 / analog AN3 / VREF+ |
| Broche 18 | RA4 — PORT A bit 4 / analog AN4 |
| Broche 19 | RA5 — PORT A bit 5 / analog AN5 / VREF- |
| Broche 20 | AVDD — Analog supply |
| Broche 21 | AVSS — Analog ground |
| Broche 22 | RB0 — PORT B bit 0 / INT0 |
| Broche 23 | RB1 — PORT B bit 1 / INT1 |
| Broche 24 | RB2 — PORT B bit 2 / INT2 |
| Broche 25 | RB3 — PORT B bit 3 / INT3 |
| Broche 26 | RB4 — PORT B bit 4 |
| Broche 27 | RB5 — PORT B bit 5 |
| Broche 28 | RB6 — PORT B bit 6 / PGC (programming) |
| Broche 29 | RB7 — PORT B bit 7 / PGD (programming) |
| Broche 30 | VDD — Positive supply |
| Broche 31 | VSS — Ground |
| Broche 32 | RC0 — PORT C bit 0 |
| Broche 33 | RC1 — PORT C bit 1 |
| Broche 34 | RC2 — PORT C bit 2 |
| Broche 35 | RC3 — PORT C bit 3 / SCL |
| Broche 36 | RC4 — PORT C bit 4 / SDA |
| Broche 37 | RC5 — PORT C bit 5 |
| Broche 38 | RC6 — PORT C bit 6 / TX |
| Broche 39 | RC7 — PORT C bit 7 / RX |
| Broche 40 | RD0 — PORT D bit 0 |
| Broche 41 | RD1 — PORT D bit 1 |
| Broche 42 | RD2 — PORT D bit 2 |
| Broche 43 | RD3 — PORT D bit 3 |
| Broche 44 | RD4 — PORT D bit 4 |
| Broche 45 | RD5 — PORT D bit 5 |
| Broche 46 | RD6 — PORT D bit 6 |
| Broche 47 | RD7 — PORT D bit 7 |
| Broche 48 | SEG0 — LCD segment 0 |
| Broche 49 | SEG1 — LCD segment 1 |
| Broche 50 | SEG2 — LCD segment 2 |
| Broche 51 | SEG3 — LCD segment 3 |
| Broche 52 | SEG4 — LCD segment 4 |
| Broche 53 | SEG5 — LCD segment 5 |
| Broche 54 | SEG6 — LCD segment 6 |
| Broche 55 | SEG7 — LCD segment 7 |
| Broche 56 | SEG8 — LCD segment 8 |
| Broche 57 | SEG9 — LCD segment 9 |
| Broche 58 | SEG10 — LCD segment 10 |
| Broche 59 | SEG11 — LCD segment 11 |
| Broche 60 | SEG12 — LCD segment 12 |
| Broche 61 | SEG13 — LCD segment 13 |
| Broche 62 | SEG14 — LCD segment 14 |
| Broche 63 | SEG15 — LCD segment 15 |
| Broche 64 | SEG16 — LCD segment 16 |
| Broche 65 | SEG17 — LCD segment 17 |
| Broche 66 | SEG18 — LCD segment 18 |
| Broche 67 | SEG19 — LCD segment 19 |
| Broche 68 | COM0 — LCD common 0 |
| Broche 69 | COM1 — LCD common 1 |
| Broche 70 | COM2 — LCD common 2 |
| Broche 71 | COM3 — LCD common 3 |
| Broche 72 | VLCD1 — LCD charge pump node |
| Broche 73 | VLCD2 — LCD charge pump node |
| Broche 74 | VLCD3 — LCD charge pump node |
| Broche 75 | RF0 — PORT F bit 0 / LCD segment |
| Broche 76 | RF1 — PORT F bit 1 / LCD segment |
| Broche 77 | RF2 — PORT F bit 2 / LCD segment |
| Broche 78 | RF3 — PORT F bit 3 / LCD segment |
| Broche 79 | RF4 — PORT F bit 4 / LCD segment |
| Broche 80 | RF5 — PORT F bit 5 / LCD segment |
Applications typiques
PIC18F84J90T-I/PT convient pour 7 applications: 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.
Recommandé
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.
Recommandé
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.
Recommandé
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.
Recommandé
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.
Recommandé
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.
Recommandé
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.
Recommandé
Récapitulatif des produits recommandés
Données de référence d'ingénierie pour PIC18F84J90T-I/PT — comparaison, recommandations de conception et informations de conformité.
Guide de sélection
Comparaison avec les alternatives
| Paramètre | Ce produit | 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) |
Principaux différenciateurs
- Tape-and-reel packaging for high-volume SMT assembly (vs PIC18F84J90-I/PT)
- Optimised 16 KB Flash / 1 KB RAM for cost-sensitive metering (vs PIC18F8490-I/PT (32 KB Flash / 2 KB RAM))
- Hardware charge-pump LCD driver eliminates external VLCD boost (vs PIC18F6722-I/PT (older non-J LCD PIC18))
Notes de conception
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.
Informations de conformité
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).
