PIC18F85J90-I/PT - 8-bit 40MHz 32KB Flash LCD MCU 80-TQFP | Microchip
MPN: PIC18F85J90-I/PT ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $7.2 | $7.20 |
| 10 | $6.45 | $64.50 |
| 100 | $5.65 | $565.00 |
| 500 | $5.05 | $2,525.00 |
| 1,000 | $4.5 | $4,500.00 |
PIC18F85J90-I/PT Overview
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.
Drop-in alternatives for PIC18F85J90-I/PT — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Variants in this series
Same-series models that are drop-in compatible with PIC18F85J90-I/PT (same form factor and footprint) — differing in Package, ADC, Program Memory (Flash), I/O Pins, Operating Temperature.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
PIC18F86J90-I/PT
✅ Drop-In✓ In Stock
$2.86 / Unit
View Datasheet →PIC18F85J50-I/PT
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
PIC18F85J11-I/PT
✅ Drop-In ⚠️ Specs Unverified✓ In Stock
$3.76 / Unit
View Datasheet →PIC18F8585-I/PT
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
PIC18F8490-I/PT
✅ Drop-In ⚠️ Specs Unverified✓ In Stock
$5.55 / Unit
View Datasheet →PIC18F84J90T-I/PT
✅ Drop-In ⚠️ Specs Unverified✓ In Stock
$5.4 / Unit
View Datasheet →PIC18F85J90-I/PT Maximum Ratings & Electrical Characteristics
| 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 |
| Package | 80-pin TQFP (PT), 12x12 mm, 1 mm height |
| Mounting Type | Surface Mount |
| Operating Temperature | -40C to +85C (Industrial) |
| Power-Saving Modes | nanoWatt Technology (Idle, Sleep, Deep Sleep) |
| RoHS Status | Compliant |
| MSL Level | 3 (168 hours) |
| ICSP Programming | Yes (PGC/PGD/PGM pins) |
PIC18F85J90-I/PT Pin Configuration
| Pin 1 | RG0/SEG29 — I/O port RG0 / LCD segment 29 |
| Pin 2 | RG1/SEG30 — I/O port RG1 / LCD segment 30 |
| Pin 3 | RG2/SEG31 — I/O port RG2 / LCD segment 31 |
| Pin 4 | RG3/SEG32 — I/O port RG3 / LCD segment 32 |
| Pin 5 | RG4/SEG41 — I/O port RG4 / LCD segment 41 |
| Pin 6 | MCLR — Master Clear (reset) input |
| Pin 7 | OSC1/CLKI — Crystal oscillator input / external clock |
| Pin 8 | OSC2/CLKO — Crystal oscillator output |
| Pin 9 | RA0/AN0 — I/O port RA0 / ADC input 0 |
| Pin 10 | RA1/AN1 — I/O port RA1 / ADC input 1 |
| Pin 11 | RA2/AN2 — I/O port RA2 / ADC input 2 |
| Pin 12 | RA3/AN3 — I/O port RA3 / ADC input 3 |
| Pin 13 | RA4/AN4 — I/O port RA4 / ADC input 4 |
| Pin 14 | RA5/AN5 — I/O port RA5 / ADC input 5 |
| Pin 15 | RA6 — I/O port RA6 |
| Pin 16 | RA7 — I/O port RA7 |
| Pin 17 | VSS — Ground reference |
| Pin 18 | VDD — Positive supply voltage |
| Pin 19 | RB0/INT0 — I/O port RB0 / external interrupt 0 |
| Pin 20 | RB1/INT1 — I/O port RB1 / external interrupt 1 |
| Pin 21 | RB2/INT2 — I/O port RB2 / external interrupt 2 |
| Pin 22 | RB3/INT3 — I/O port RB3 / external interrupt 3 |
| Pin 23 | RB4 — I/O port RB4 |
| Pin 24 | RB5 — I/O port RB5 |
| Pin 25 | RB6/PGC — I/O port RB6 / ICSP clock |
| Pin 26 | RB7/PGD — I/O port RB7 / ICSP data |
| Pin 27 | RC0 — I/O port RC0 |
| Pin 28 | RC1 — I/O port RC1 |
| Pin 29 | RC2 — I/O port RC2 |
| Pin 30 | RC3 — I/O port RC3 |
| Pin 31 | RC4 — I/O port RC4 |
| Pin 32 | RC5 — I/O port RC5 |
| Pin 33 | RC6 — I/O port RC6 |
| Pin 34 | RC7 — I/O port RC7 |
| Pin 35 | VSS — Ground reference |
| Pin 36 | VDD — Positive supply voltage |
| Pin 37 | RD0 — I/O port RD0 |
| Pin 38 | RD1 — I/O port RD1 |
| Pin 39 | RD2 — I/O port RD2 |
| Pin 40 | RD3 — I/O port RD3 |
| Pin 41 | RD4 — I/O port RD4 |
| Pin 42 | RD5 — I/O port RD5 |
| Pin 43 | RD6 — I/O port RD6 |
| Pin 44 | RD7 — I/O port RD7 |
| Pin 45 | VSS — Ground reference |
| Pin 46 | VDD — Positive supply voltage |
| Pin 47 | RE0 — I/O port RE0 |
| Pin 48 | RE1 — I/O port RE1 |
| Pin 49 | RE2 — I/O port RE2 |
| Pin 50 | RE3 — I/O port RE3 |
| Pin 51 | RE4 — I/O port RE4 |
| Pin 52 | RE5 — I/O port RE5 |
| Pin 53 | RE6 — I/O port RE6 |
| Pin 54 | RE7 — I/O port RE7 |
| Pin 55 | RF0 — I/O port RF0 |
| Pin 56 | RF1/AN6 — I/O port RF1 / ADC input 6 |
| Pin 57 | RF2/AN7 — I/O port RF2 / ADC input 7 |
| Pin 58 | RF3/AN8 — I/O port RF3 / ADC input 8 |
| Pin 59 | RF4/AN9 — I/O port RF4 / ADC input 9 |
| Pin 60 | RF5/AN10 — I/O port RF5 / ADC input 10 |
| Pin 61 | RF6/AN11 — I/O port RF6 / ADC input 11 |
| Pin 62 | RF7 — I/O port RF7 |
| Pin 63 | VSS — Ground reference |
| Pin 64 | VDD — Positive supply voltage |
| Pin 65 | RH0/SEG12 — I/O port RH0 / LCD segment 12 |
| Pin 66 | RH1/SEG13 — I/O port RH1 / LCD segment 13 |
| Pin 67 | RH2/SEG14 — I/O port RH2 / LCD segment 14 |
| Pin 68 | RH3/SEG15 — I/O port RH3 / LCD segment 15 |
| Pin 69 | RH4/SEG16 — I/O port RH4 / LCD segment 16 |
| Pin 70 | RH5/SEG17 — I/O port RH5 / LCD segment 17 |
| Pin 71 | RH6/SEG18 — I/O port RH6 / LCD segment 18 |
| Pin 72 | RH7/SEG19 — I/O port RH7 / LCD segment 19 |
| Pin 73 | RJ0 — I/O port RJ0 |
| Pin 74 | RJ1 — I/O port RJ1 |
| Pin 75 | RJ2 — I/O port RJ2 |
| Pin 76 | RJ3 — I/O port RJ3 |
| Pin 77 | RJ4 — I/O port RJ4 |
| Pin 78 | RJ5 — I/O port RJ5 |
| Pin 79 | RJ6 — I/O port RJ6 |
| Pin 80 | RJ7 — I/O port RJ7 |
Typical Applications
PIC18F85J90-I/PT is suitable for 6 applications: 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.
Recommended
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.
Recommended
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.
Recommended
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.
Recommended
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.
Recommended
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.
Recommended
Recommended Products Summary
Engineering reference data for PIC18F85J90-I/PT — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | 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) |
Key Differentiators
- Integrated 192-segment LCD driver eliminates external LCD controller (vs PIC18F85J11-I/PT)
- Doubled Flash memory in same package for code growth headroom (vs PIC18F86J90-I/PT)
- nanoWatt Technology with multiple sleep modes for battery designs (vs PIC18F6722-I/PT)
Design Notes
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.
Compliance Information
RoHS compliant per Microchip product page. Halogen-free status not explicitly stated in verified data; confirm via Microchip material declaration if required.
