PIC18F85J90-I/PT - 8-bit 40MHz 32KB Flash LCD MCU 80-TQFP | Microchip
MPN: PIC18F85J90-I/PT ✓ Hoạt độngPIC18F85J90-I/PT Tóm tắt
An 8-bit PIC microcontroller is a RISC (Reduced Instruction Set Computer) device optimized for embedded control, providing deterministic interrupt latency and a rich peripheral set in compact packages. Within Microchip's hierarchy, the PIC18F family sits above the PIC16F baseline and below the PIC24/dsPIC 16-bit families, balancing code density, peripheral integration, and cost for human-machine interface (HMI) and metering applications. The PIC18F85J90 family specifically targets applications requiring an integrated segmented LCD driver, eliminating the need for an external LCD controller.
Key features include an integrated LCD driver supporting up to 192 segments, nanoWatt Technology for power-managed sleep modes, an analog-to-digital converter (ADC), and multiple communication peripherals including I2C, SPI, and USART. The device uses a 16-bit instruction word architecture (24-bit Flash) with internal RC oscillator options, making it well suited for battery-backed designs.
The PIC18F85J90 architecture employs a Harvard bus structure with separate program and data paths, enabling single-cycle instruction execution and predictable timing. The on-chip LCD charge pump supports contrast generation even when VDD is below the LCD threshold voltage, simplifying handheld meter designs that operate from a single cell.
Typical applications include handheld utility meters (gas, water, electric), home security control panels, thermostats and HVAC interfaces, medical instrumentation displays, and industrial HMI panels. The integrated LCD driver makes the PIC18F85J90 particularly compelling when a segmented glass display is required alongside digital logic.
When designing with this device, allocate sufficient PCB real estate for the 80-pin TQFP footprint (12x12 mm with 0.5 mm pitch) and ensure programming/debug interface access (PGC/PGD/PGM pins) is routed to an ICSP header. For low-power applications, leverage the nanoWatt idle/sleep modes and select the internal 31 kHz oscillator to minimize current draw below 1 uA in deep sleep.
This page synthesizes distributor pricing, drop-in pin-compatible alternatives from the same Microchip PIC18 family, and practical design notes not found in the standalone manufacturer datasheet to accelerate component selection for embedded LCD designs.
Bộ thay thế dễ dàng lắp đặt cho PIC18F85J90-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 PIC18F85J90-I/PT (cùng hình factor và footprint) — khác nhau ở Operating Temperature, Package, Program Memory (Flash), I/O Pins, ADC.
PIC18F86J90-I/PT
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →PIC18F85J50-I/PT
✅ Drop-In ⚠️ Thông số chưa được xác minhLiên hệ để biết giá
Xem tài liệu →PIC18F85J11-I/PT
✅ Drop-In ⚠️ Thông số chưa được xác minhLiên hệ để biết giá
Xem tài liệu →PIC18F8585-I/PT
✅ Drop-In ⚠️ Thông số chưa được xác minhLiên hệ để biết giá
Xem tài liệu →PIC18F8490-I/PT
✅ Drop-In ⚠️ Thông số chưa được xác minhLiên hệ để biết giá
Xem tài liệu →PIC18F84J90T-I/PT
✅ Drop-In ⚠️ Thông số chưa được xác minhLiên hệ để biết giá
Xem tài liệu →PIC18F85J90-I/PT Tỷ lệ tối đa & tính chất điện
| Core Architecture | PIC18 8-bit RISC |
| Program Memory (Flash) | 32 KB (16K x 16 words) |
| RAM | 2 KB (2048 bytes) |
| Maximum CPU Speed | 40 MHz (10 MIPS) |
| Supply Voltage (VDD) | 2.0 V to 5.5 V |
| I/O Pins | 67 (max) |
| LCD Segments Supported | Up to 192 segments |
| ADC | 10-bit, multi-channel |
| Communication Peripherals | I2C, SPI, USART (A/E/I enhanced) |
| Timers | Multiple 8-bit and 16-bit timers |
| Hộp | 80-pin TQFP (PT), 12x12 mm, 1 mm height |
| Kiểu lắp đặt | Surface Mount |
| Nhiệt độ hoạt động | -40C to +85C (Industrial) |
| Power-Saving Modes | nanoWatt Technology (Idle, Sleep, Deep Sleep) |
| Trạng thái RoHS | Compliant |
| Cấp MSL | 3 (168 hours) |
| ICSP Programming | Yes (PGC/PGD/PGM pins) |
Cấu hình chân PIC18F85J90-I/PT
| Chân 1 | RG0/SEG29 — I/O port RG0 / LCD segment 29 |
| Chân 2 | RG1/SEG30 — I/O port RG1 / LCD segment 30 |
| Chân 3 | RG2/SEG31 — I/O port RG2 / LCD segment 31 |
| Chân 4 | RG3/SEG32 — I/O port RG3 / LCD segment 32 |
| Chân 5 | RG4/SEG41 — I/O port RG4 / LCD segment 41 |
| Chân 6 | MCLR — Master Clear (reset) input |
| Chân 7 | OSC1/CLKI — Crystal oscillator input / external clock |
| Chân 8 | OSC2/CLKO — Crystal oscillator output |
| Chân 9 | RA0/AN0 — I/O port RA0 / ADC input 0 |
| Chân 10 | RA1/AN1 — I/O port RA1 / ADC input 1 |
| Chân 11 | RA2/AN2 — I/O port RA2 / ADC input 2 |
| Chân 12 | RA3/AN3 — I/O port RA3 / ADC input 3 |
| Chân 13 | RA4/AN4 — I/O port RA4 / ADC input 4 |
| Chân 14 | RA5/AN5 — I/O port RA5 / ADC input 5 |
| Chân 15 | RA6 — I/O port RA6 |
| Chân 16 | RA7 — I/O port RA7 |
| Chân 17 | VSS — Ground reference |
| Chân 18 | VDD — Positive supply voltage |
| Chân 19 | RB0/INT0 — I/O port RB0 / external interrupt 0 |
| Chân 20 | RB1/INT1 — I/O port RB1 / external interrupt 1 |
| Chân 21 | RB2/INT2 — I/O port RB2 / external interrupt 2 |
| Chân 22 | RB3/INT3 — I/O port RB3 / external interrupt 3 |
| Chân 23 | RB4 — I/O port RB4 |
| Chân 24 | RB5 — I/O port RB5 |
| Chân 25 | RB6/PGC — I/O port RB6 / ICSP clock |
| Chân 26 | RB7/PGD — I/O port RB7 / ICSP data |
| Chân 27 | RC0 — I/O port RC0 |
| Chân 28 | RC1 — I/O port RC1 |
| Chân 29 | RC2 — I/O port RC2 |
| Chân 30 | RC3 — I/O port RC3 |
| Chân 31 | RC4 — I/O port RC4 |
| Chân 32 | RC5 — I/O port RC5 |
| Chân 33 | RC6 — I/O port RC6 |
| Chân 34 | RC7 — I/O port RC7 |
| Chân 35 | VSS — Ground reference |
| Chân 36 | VDD — Positive supply voltage |
| Chân 37 | RD0 — I/O port RD0 |
| Chân 38 | RD1 — I/O port RD1 |
| Chân 39 | RD2 — I/O port RD2 |
| Chân 40 | RD3 — I/O port RD3 |
| Chân 41 | RD4 — I/O port RD4 |
| Chân 42 | RD5 — I/O port RD5 |
| Chân 43 | RD6 — I/O port RD6 |
| Chân 44 | RD7 — I/O port RD7 |
| Chân 45 | VSS — Ground reference |
| Chân 46 | VDD — Positive supply voltage |
| Chân 47 | RE0 — I/O port RE0 |
| Chân 48 | RE1 — I/O port RE1 |
| Chân 49 | RE2 — I/O port RE2 |
| Chân 50 | RE3 — I/O port RE3 |
| Chân 51 | RE4 — I/O port RE4 |
| Chân 52 | RE5 — I/O port RE5 |
| Chân 53 | RE6 — I/O port RE6 |
| Chân 54 | RE7 — I/O port RE7 |
| Chân 55 | RF0 — I/O port RF0 |
| Chân 56 | RF1/AN6 — I/O port RF1 / ADC input 6 |
| Chân 57 | RF2/AN7 — I/O port RF2 / ADC input 7 |
| Chân 58 | RF3/AN8 — I/O port RF3 / ADC input 8 |
| Chân 59 | RF4/AN9 — I/O port RF4 / ADC input 9 |
| Chân 60 | RF5/AN10 — I/O port RF5 / ADC input 10 |
| Chân 61 | RF6/AN11 — I/O port RF6 / ADC input 11 |
| Chân 62 | RF7 — I/O port RF7 |
| Chân 63 | VSS — Ground reference |
| Chân 64 | VDD — Positive supply voltage |
| Chân 65 | RH0/SEG12 — I/O port RH0 / LCD segment 12 |
| Chân 66 | RH1/SEG13 — I/O port RH1 / LCD segment 13 |
| Chân 67 | RH2/SEG14 — I/O port RH2 / LCD segment 14 |
| Chân 68 | RH3/SEG15 — I/O port RH3 / LCD segment 15 |
| Chân 69 | RH4/SEG16 — I/O port RH4 / LCD segment 16 |
| Chân 70 | RH5/SEG17 — I/O port RH5 / LCD segment 17 |
| Chân 71 | RH6/SEG18 — I/O port RH6 / LCD segment 18 |
| Chân 72 | RH7/SEG19 — I/O port RH7 / LCD segment 19 |
| Chân 73 | RJ0 — I/O port RJ0 |
| Chân 74 | RJ1 — I/O port RJ1 |
| Chân 75 | RJ2 — I/O port RJ2 |
| Chân 76 | RJ3 — I/O port RJ3 |
| Chân 77 | RJ4 — I/O port RJ4 |
| Chân 78 | RJ5 — I/O port RJ5 |
| Chân 79 | RJ6 — I/O port RJ6 |
| Chân 80 | RJ7 — I/O port RJ7 |
Ứng dụng tiêu biểu
PIC18F85J90-I/PT phù hợp cho 6 Áp dụngs: Handheld Utility Meters (Gas / Water / Electric), Home Security Control Panels with LCD Keypad, Thermostats and HVAC User Interfaces, Medical Instrumentation Displays, Industrial HMI Panels and Operator Interfaces, Point-of-Sale Terminals and Kitchen Display Controllers.
Handheld Utility Meters (Gas / Water / Electric)
The PIC18F85J90-I/PT's integrated LCD driver supporting up to 192 segments and nanoWatt power-saving modes make it ideal for battery-powered handheld utility meters. The on-chip charge pump generates LCD bias voltages from a single 3V cell, while deep-sleep current below 100 nA extends battery life beyond 10 years in metering duty cycles. The 32 KB Flash accommodates metering firmware with tamper detection, calibration constants, and segmented LCD rendering, all within a compact 80-pin TQFP.
Được đề xuất
Home Security Control Panels with LCD Keypad
Security panels benefit from the PIC18F85J90-I/PT's combination of 67 I/O pins for keypad scanning, zone inputs, and siren drivers, plus the LCD segment driver for status displays showing armed state, zone faults, and event logs. The 40 MHz / 10 MIPS throughput handles keypad debouncing, communication with wireless sensors, and real-time LCD refresh without latency. Wide 2.0V-5.5V supply tolerance enables direct operation from backup battery stacks during AC loss.
Được đề xuất
Thermostats and HVAC User Interfaces
Thermostat designs leverage the PIC18F85J90-I/PT's LCD segment driver for backlit temperature displays and the ADC for thermistor sensing, while nanoWatt sleep modes preserve battery life during idle periods. The 8-bit PIC18 core executes scheduling logic, PID control loops, and weekly programming menus within the 32 KB Flash budget. Industrial -40C to +85C temperature range supports both indoor wall-mounted units and outdoor equipment installations without derating.
Được đề xuất
Medical Instrumentation Displays
Medical devices such as portable glucose meters, blood pressure monitors, and infusion pumps use the PIC18F85J90-I/PT for its LCD driver plus low-power modes critical for battery operation. The 10-bit ADC digitizes sensor inputs with adequate resolution for clinical readings, and the 8-bit RISC core executes measurement algorithms within deterministic timing. The wide 2.0V-5.5V supply range supports both lithium primary cells and rechargeable battery chemistries used in medical handhelds.
Được đề xuất
Industrial HMI Panels and Operator Interfaces
Industrial HMI panels benefit from the PIC18F85J90-I/PT's 67 I/O pins for button matrices, encoder inputs, relay outputs, and the integrated LCD driver for status display. Communication peripherals (USART, SPI, I2C) interface to sensor networks and host controllers, while the 40 MHz CPU ensures responsive panel behavior. The industrial temperature range -40C to +85C and robust 80-pin TQFP package support factory-floor deployment with stable operation.
Được đề xuất
Point-of-Sale Terminals and Kitchen Display Controllers
Point-of-sale and food-service display terminals use the PIC18F85J90-I/PT for the LCD segment driver showing order status, prices, and totals. The I2C/SPI interfaces connect to receipt printers and card readers, while USART links to back-office inventory systems. With 32 KB Flash and 2 KB RAM, the device supports menu navigation logic and small transaction queues in compact 80-pin TQFP designs, suitable for tight PCB constraints in countertop equipment.
Được đề xuất
Tóm tắt các sản phẩm được đề xuất
Dữ liệu tham khảo kỹ thuật cho PIC18F85J90-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 | PIC18F86J90-I/PT | PIC18F85J50-I/PT | PIC18F85J11-I/PT | PIC18F8490-I/PT |
|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 80-pin TQFP (PT) 12x12 mm | 80-pin TQFP (PT) - same | 80-pin TQFP (PT) - same | 80-pin TQFP (PT) - same | 80-pin TQFP (PT) - same |
| Flash Memory | 32 KB | 64 KB (+100%) | 32 KB (same) | 32 KB (same) | 16 KB (-50%) |
| RAM | 2 KB | 2 KB (same) | 2 KB (same) | 2 KB (same) | 1 KB (-50%) |
| Integrated LCD Driver | Yes (192 segments) | Yes (192 segments) | No (USB instead) | No | Yes (192 segments) |
| USB Support | No | No | Yes (USB 2.0 FS) | No | No |
| Supply Voltage Range | 2.0V to 5.5V | 2.0V to 5.5V (same) | 2.0V to 5.5V (same) | 2.0V to 5.5V (same) | 2.0V to 5.5V (same) |
| Operating Temperature | -40C to +85C (Industrial) | -40C to +85C (same) | -40C to +85C (same) | -40C to +85C (same) | -40C to +85C (same) |
| Approx. Unit Price (qty 100) | $5.65 | $6.50 (est., higher Flash) | $6.20 (est., USB variant) | $5.40 (est., no LCD) | $5.10 (est., lower Flash) |
Bảo phân biệt quan trọng
- Integrated 192-segment LCD driver eliminates external LCD controller (vsPIC18F85J11-I/PT)
- Doubled Flash memory in same package for code growth headroom (vsPIC18F86J90-I/PT)
- nanoWatt Technology with multiple sleep modes for battery designs (vsPIC18F6722-I/PT)
Ghi chú thiết kế
Leverage the nanoWatt Technology sleep modes (Sleep, Idle, Deep Sleep) to minimize current consumption in battery-backed meter applications. Selecting the internal 31 kHz LFINTOSC as the system clock during sleep can reduce total current below 100 nA in Deep Sleep with RTCC and LCD enabled. Always configure the LCD charge pump voltage (VLCD) before entering sleep so the display retains contrast during low-power states, and use the on-chip Real-Time Clock Calendar (RTCC) with a 32.768 kHz crystal to maintain timekeeping while the core sleeps.
For the 80-pin TQFP (12x12 mm body, 0.5 mm pitch), allocate generous copper pours under the device for thermal dissipation and place all VDD/VSS pairs (pins 17/18, 35/36, 45/46, 63/64) with 100 nF decoupling capacitors placed within 3 mm of each pair. Route ICSP signals (PGC/PGD/MCLR) to a 6-pin header with no series resistors, since ICSP requires direct drive; keep the trace length under 50 mm to avoid programming failures.
Do not confuse the J90 family pinout with the K90 or earlier F-series PIC18 80-pin variants - while many pins share functions, the LCD segment assignments differ between families. Always confirm the exact pinout from the Microchip datasheet DS39770C before laying out a PCB. Another common mistake is failing to enable the LCD module's bias and waveform configuration registers before expecting display output; the LCD will remain blank if the LCDCON, LCDPS, and LCDSE registers are not initialized correctly during firmware startup.
Thông tin tuân thủ
RoHS compliant per Microchip product page. Halogen-free status not explicitly stated in verified data; confirm via Microchip material declaration if required.