PIC18F84J90T-I/PT - 8-Bit 40MHz 16KB Flash MCU | Microchip
MPN： PIC18F84J90T-I/PT ✓ 啟用中PIC18F84J90T-I/PT 概覽
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.
直接替換替代品，適用於 PIC18F84J90T-I/PT — 相同封裝，腳位對腳位相容。需重新設計 PCB 的不同封裝零件不列入。
此系列的變體
與下列產品可直接替換的同系列型號： PIC18F84J90T-I/PT （相同外形與佔位） — 差異在於 Package, I/O Pins, Operating Temperature, ADC, Core Architecture.
PIC18F84J90-I/PT
✅ 直接替換聯絡詢價
查看資料表 →PIC18F8490-I/PT
✅ 直接替換聯絡詢價
查看資料表 →PIC18F8410-I/PT
✅ 直接替換聯絡詢價
查看資料表 →PIC18F67J90-I/PT
✅ 直接替換 ⚠️ 規格未經驗證聯絡詢價
查看資料表 →PIC18F84J11-I/PT
✅ 直接替換聯絡詢價
查看資料表 →PIC18F6722-I/PT
✅ 直接替換聯絡詢價
查看資料表 →PIC18F84J90T-I/PT 最大額定值與電氣特性
| Core | PIC18 8-bit RISC |
| Instruction Width | 16-bit (8K x 16 program memory) |
| 資料匯流排寬度 | 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 |
| 工作溫度 | -40C to +85C (Industrial, -I suffix) |
| 封裝 | 80-pin TQFP (PT) 12x12 mm |
| 安裝類型 | Surface Mount |
| Series | PIC18J |
| ROM Type | Flash (self-programmable) |
| Lifecycle Stage | Active |
| RoHS 狀態 | Compliant |
PIC18F84J90T-I/PT 腳位配置
| 腳位 1 | RE0 — PORT E bit 0 / LCD segment |
| 腳位 2 | RE1 — PORT E bit 1 / LCD segment |
| 腳位 3 | RE2 — PORT E bit 2 / LCD segment |
| 腳位 4 | RE3 — PORT E bit 3 / LCD segment |
| 腳位 5 | RE4 — PORT E bit 4 / LCD segment |
| 腳位 6 | RE5 — PORT E bit 5 / LCD segment |
| 腳位 7 | RE6 — PORT E bit 6 / LCD segment |
| 腳位 8 | RE7 — PORT E bit 7 / LCD segment |
| 腳位 9 | VDD — Positive supply (4.2-5.5 V) |
| 腳位 10 | VSS — Ground reference |
| 腳位 11 | OSC1 — Crystal/oscillator input |
| 腳位 12 | OSC2 — Crystal/oscillator output |
| 腳位 13 | MCLR — Master clear / programming voltage |
| 腳位 14 | RA0 — PORT A bit 0 / analog AN0 |
| 腳位 15 | RA1 — PORT A bit 1 / analog AN1 |
| 腳位 16 | RA2 — PORT A bit 2 / analog AN2 |
| 腳位 17 | RA3 — PORT A bit 3 / analog AN3 / VREF+ |
| 腳位 18 | RA4 — PORT A bit 4 / analog AN4 |
| 腳位 19 | RA5 — PORT A bit 5 / analog AN5 / VREF- |
| 腳位 20 | AVDD — Analog supply |
| 腳位 21 | AVSS — Analog ground |
| 腳位 22 | RB0 — PORT B bit 0 / INT0 |
| 腳位 23 | RB1 — PORT B bit 1 / INT1 |
| 腳位 24 | RB2 — PORT B bit 2 / INT2 |
| 腳位 25 | RB3 — PORT B bit 3 / INT3 |
| 腳位 26 | RB4 — PORT B bit 4 |
| 腳位 27 | RB5 — PORT B bit 5 |
| 腳位 28 | RB6 — PORT B bit 6 / PGC (programming) |
| 腳位 29 | RB7 — PORT B bit 7 / PGD (programming) |
| 腳位 30 | VDD — Positive supply |
| 腳位 31 | VSS — Ground |
| 腳位 32 | RC0 — PORT C bit 0 |
| 腳位 33 | RC1 — PORT C bit 1 |
| 腳位 34 | RC2 — PORT C bit 2 |
| 腳位 35 | RC3 — PORT C bit 3 / SCL |
| 腳位 36 | RC4 — PORT C bit 4 / SDA |
| 腳位 37 | RC5 — PORT C bit 5 |
| 腳位 38 | RC6 — PORT C bit 6 / TX |
| 腳位 39 | RC7 — PORT C bit 7 / RX |
| 腳位 40 | RD0 — PORT D bit 0 |
| 腳位 41 | RD1 — PORT D bit 1 |
| 腳位 42 | RD2 — PORT D bit 2 |
| 腳位 43 | RD3 — PORT D bit 3 |
| 腳位 44 | RD4 — PORT D bit 4 |
| 腳位 45 | RD5 — PORT D bit 5 |
| 腳位 46 | RD6 — PORT D bit 6 |
| 腳位 47 | RD7 — PORT D bit 7 |
| 腳位 48 | SEG0 — LCD segment 0 |
| 腳位 49 | SEG1 — LCD segment 1 |
| 腳位 50 | SEG2 — LCD segment 2 |
| 腳位 51 | SEG3 — LCD segment 3 |
| 腳位 52 | SEG4 — LCD segment 4 |
| 腳位 53 | SEG5 — LCD segment 5 |
| 腳位 54 | SEG6 — LCD segment 6 |
| 腳位 55 | SEG7 — LCD segment 7 |
| 腳位 56 | SEG8 — LCD segment 8 |
| 腳位 57 | SEG9 — LCD segment 9 |
| 腳位 58 | SEG10 — LCD segment 10 |
| 腳位 59 | SEG11 — LCD segment 11 |
| 腳位 60 | SEG12 — LCD segment 12 |
| 腳位 61 | SEG13 — LCD segment 13 |
| 腳位 62 | SEG14 — LCD segment 14 |
| 腳位 63 | SEG15 — LCD segment 15 |
| 腳位 64 | SEG16 — LCD segment 16 |
| 腳位 65 | SEG17 — LCD segment 17 |
| 腳位 66 | SEG18 — LCD segment 18 |
| 腳位 67 | SEG19 — LCD segment 19 |
| 腳位 68 | COM0 — LCD common 0 |
| 腳位 69 | COM1 — LCD common 1 |
| 腳位 70 | COM2 — LCD common 2 |
| 腳位 71 | COM3 — LCD common 3 |
| 腳位 72 | VLCD1 — LCD charge pump node |
| 腳位 73 | VLCD2 — LCD charge pump node |
| 腳位 74 | VLCD3 — LCD charge pump node |
| 腳位 75 | RF0 — PORT F bit 0 / LCD segment |
| 腳位 76 | RF1 — PORT F bit 1 / LCD segment |
| 腳位 77 | RF2 — PORT F bit 2 / LCD segment |
| 腳位 78 | RF3 — PORT F bit 3 / LCD segment |
| 腳位 79 | RF4 — PORT F bit 4 / LCD segment |
| 腳位 80 | RF5 — PORT F bit 5 / LCD segment |
典型應用
PIC18F84J90T-I/PT 適用於 7 應用s: 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.
推薦
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.
推薦
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.
推薦
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.
推薦
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.
推薦
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.
推薦
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.
推薦
推薦產品摘要
工程參考資料，適用於 PIC18F84J90T-I/PT — 比較、設計指引及合規資訊。
選型指南
與替代品比較
| 參數 | 本產品 | 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) |
主要差異化特點
- Tape-and-reel packaging for high-volume SMT assembly (對比PIC18F84J90-I/PT)
- Optimised 16 KB Flash / 1 KB RAM for cost-sensitive metering (對比PIC18F8490-I/PT (32 KB Flash / 2 KB RAM))
- Hardware charge-pump LCD driver eliminates external VLCD boost (對比PIC18F6722-I/PT (older non-J LCD PIC18))
設計說明
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.
合規資訊
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).
