PIC18F66K90-I/PT - 8-bit 64MHz 64KB Flash LCD MCU | Microchip
MPN: PIC18F66K90-I/PT ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $6.5 | $6.50 |
| 10 | $5.85 | $58.50 |
| 100 | $5.2 | $520.00 |
| 500 | $4.68 | $2,340.00 |
| 1,000 | $4.15 | $4,150.00 |
PIC18F66K90-I/PT Overview
Key features include an integrated LCD driver supporting up to 192 segments, the CTMU peripheral for capacitive touch sensing, nanoWatt XLP sleep modes for low-power operation, and 54 configurable I/O pins. The device includes multiple communication peripherals such as EUSART, I2C, and SPI, along with 12-bit ADC and multiple timers. The 64-pin TQFP package provides ample I/O for complex embedded designs while maintaining a compact 10x10mm footprint.
The PIC18F66K90-I/PT belongs to Microchip's PIC18F87K90 family, which features nanoWatt XLP technology for ultra-low-power sleep modes. The architecture includes a 16-bit instruction set with 8-bit data path, hardware multiplier, and 31-level hardware stack. The CTMU module enables accurate time measurement for capacitive touch sensing applications, making it ideal for user interfaces on battery-powered devices.
Typical applications include battery-powered LCD displays, medical glucose meters and patient monitors, home automation control panels with touch interfaces, industrial HMI panels, and consumer electronics with segmented LCD displays. The combination of LCD driver, capacitive touch, and low-power operation makes it particularly suitable for handheld instruments requiring extended battery life.
When designing with this MCU, ensure proper decoupling capacitors are placed near the VDD pins. The LCD driver requires bias voltage generation - use Microchip's recommended charge pump or resistor ladder network. For capacitive touch applications, the CTMU module requires careful PCB layout to minimize noise and ensure accurate touch detection.
Drop-in alternatives for PIC18F66K90-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 PIC18F66K90-I/PT (same form factor and footprint) — differing in Package, ADC, Operating Temperature, Core Architecture, Timers.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
PIC18F65K90-I/MR
✅ Drop-In✓ In Stock
$3.02 / Unit
View Datasheet →PIC18F66K80-I/PT
✅ Drop-In✓ In Stock
$2.95 / Unit
View Datasheet →PIC18F66K40-I/PT
✅ Drop-In📋 Reference alternative (not in catalog)
PIC18F66J55-I/PT
✅ Drop-In✓ In Stock
$4.31 / Unit
View Datasheet →PIC18F66K22-I/PT
✅ Drop-In✓ In Stock
$3.96 / Unit
View Datasheet →PIC18F66K90-I/PT Maximum Ratings & Electrical Characteristics
| Core Architecture | PIC18 (8-bit) |
| Program Memory (Flash) | 64 KB (32K x 16) |
| RAM | 4 KB (3828 bytes) |
| EEPROM | 1 KB (1024 bytes) |
| Maximum Clock Speed | 64 MHz |
| Supply Voltage | 4.2 V to 5.5 V (industrial -I variant) |
| I/O Pins | 54 |
| Package | 64-TQFP (10x10 mm) |
| LCD Driver | Integrated, up to 192 segments |
| CTMU Module | Charge Time Measurement Unit for capacitive touch |
| ADC | 12-bit, multiple channels |
| Operating Temperature | -40C to +85C (industrial) |
| Mounting Type | Surface Mount |
| MSL Level | 3 (168 hours) |
| RoHS Status | Compliant |
| Low-Power Technology | nanoWatt XLP |
PIC18F66K90-I/PT 64-tqfp (10x10 mm) Pin Configuration Guide
Pin configuration for PIC18F66K90-I/PT (64-tqfp (10x10 mm) package). This digital IC includes GPIO, communication interfaces (UART, SPI, I2C), and power pins. Refer to the manufacturer datasheet for alternate pin functions and configuration options. Essential for embedded system design and PCB layout.
No detailed pinout data available for PIC18F66K90-I/PT.
Refer to the datasheet for full pin configuration.
Typical Applications
PIC18F66K90-I/PT is suitable for 6 applications: Battery-Powered LCD Medical Devices, Home Automation Touch Control Panels, Industrial HMI Panels, Consumer Electronics with LCD Displays, Automotive Instrument Clusters, Portable Measurement Instruments.
Battery-Powered LCD Medical Devices
The PIC18F66K90-I/PT's nanoWatt XLP technology and integrated LCD driver make it ideal for battery-powered medical devices like glucose meters and portable patient monitors. Its 192-segment LCD driver eliminates the need for external display controller chips, reducing BOM cost and PCB area. The CTMU module enables accurate capacitive touch buttons for user input. Sleep current below 100nA extends battery life to months or years on a single coin cell. The 64-pin TQFP package provides 54 I/O pins for sensor interfaces, communication ports, and display connections. The 12-bit ADC with multiple channels supports precise measurement of blood glucose, SpO2, or other biosignals. Combined with Microchip's extensive medical algorithm libraries, this MCU accelerates development of FDA-compliant portable medical devices.
Recommended
Home Automation Touch Control Panels
The PIC18F66K90-I/PT's CTMU peripheral enables robust capacitive touch sensing for home automation control panels, smart thermostats, and security keypads. The integrated LCD driver supports segmented displays showing temperature, status icons, and menu navigation without external display ICs. With 64KB Flash and 4KB RAM, the MCU can run communication stacks for Zigbee, LoRa, or WiFi modules via UART/SPI. The 64MHz core provides sufficient processing power for user interface logic and protocol handling. nanoWatt XLP sleep modes allow battery-powered wireless sensors to operate for years. The wide 4.2-5.5V supply range supports both battery and mains-powered installations with simple regulator circuits.
Recommended
Industrial HMI Panels
The PIC18F66K90-I/PT serves well in industrial human-machine interface (HMI) panels requiring LCD displays with touch capability. Its 54 I/O pins support multiple communication interfaces including RS-485 for Modbus, CAN for industrial networks, and SPI/I2C for sensor hubs. The 12-bit ADC with 12+ channels reads analog sensors like temperature, pressure, and flow meters. The CTMU module implements capacitive touch keys or sliders for operator input without mechanical buttons, improving reliability in harsh industrial environments. Extended industrial temperature range (-40C to +85C) ensures reliable operation in factory floors. The integrated LCD driver reduces component count versus designs requiring external LCD controllers.
Recommended
Consumer Electronics with LCD Displays
Consumer electronics like remote controls, kitchen appliances, and audio equipment benefit from the PIC18F66K90-I/PT's integrated LCD driver and capacitive touch support. The 192-segment LCD driver can display multi-digit numbers, text labels, and custom icons on segmented LCDs commonly used in microwaves, washing machines, and audio receivers. The nanoWatt XLP technology enables battery-powered remotes to last years on standard AAA batteries. The CTMU module replaces mechanical buttons with sleek capacitive touch interfaces. Ample program memory (64KB) supports complex user interface state machines and feature-rich applications. The 64-pin TQFP package provides sufficient I/O for motor control relays, sensor inputs, and communication ports.
Recommended
Automotive Instrument Clusters
The PIC18F66K90-I/PT supports secondary instrument cluster functions in automotive applications including motorcycle dashboards, e-bike displays, and small vehicle instrumentation. The integrated LCD driver handles speed, RPM, fuel level, and warning indicators on segmented LCD panels. The CTMU enables backlit capacitive touch buttons for mode selection and reset functions. The extended industrial temperature range and robust PIC18 architecture provide reliable operation in automotive environments. Multiple PWM outputs drive LED backlights and indicator lamps. The device's low sleep current supports battery-backed clock and trip computer functions when the vehicle is parked.
Recommended
Portable Measurement Instruments
The PIC18F66K90-I/PT is well-suited for handheld multimeters, environmental sensors, and field measurement instruments. The 12-bit ADC provides accurate measurements of voltage, current, temperature, and other physical parameters. The LCD driver displays readings, units, and mode indicators on low-power segmented displays that remain readable without backlight. nanoWatt XLP technology allows multi-year battery life for periodic measurement applications like weather stations or remote sensors. The CTMU module supports capacitive buttons for user input without mechanical wear. USB connectivity via external transceiver enables data logging and PC interface. The 64KB Flash accommodates calibration tables, measurement algorithms, and USB stack code.
Recommended
Recommended Products Summary
Engineering reference data for PIC18F66K90-I/PT — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC18F65K90-I/MR | PIC18F66K80-I/PT | PIC18F66K40-I/PT | PIC18F66J55-I/PT | PIC18F66K22-I/PT |
|---|---|---|---|---|---|---|
| Package | 64-TQFP (10x10 mm) | 64-QFN (different package) | 64-TQFP (10x10 mm) - same | 64-TQFP (10x10 mm) - same | 64-TQFP (10x10 mm) - same | 64-TQFP (10x10 mm) - same |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Program Memory (Flash) | 64 KB | 32 KB | 64 KB | 64 KB | 64 KB | 64 KB |
| LCD Driver | Yes (192 segments) | Yes (192 segments) | No | No | No | No |
| CTMU Module | Yes | Yes | No | No | No | No |
| Supply Voltage | 4.2V to 5.5V | 4.2V to 5.5V | 1.8V to 5.5V | 1.8V to 5.5V | 2.0V to 3.6V | 1.8V to 5.5V |
| nanoWatt XLP | Yes | Yes | Yes | Yes | No | Yes |
| I/O Pins | 54 | 53 | 54 | 54 | 54 | 54 |
| RAM | 4 KB | 2 KB | 4 KB | 4 KB | 4 KB | 4 KB |
Key Differentiators
- Integrated LCD driver with 192-segment support (vs PIC18F66K80-I/PT)
- CTMU module for capacitive touch sensing (vs PIC18F66K40-I/PT)
- nanoWatt XLP technology with sub-100nA sleep (vs PIC18F66J55-I/PT)
Design Notes
The PIC18F66K90-I/PT requires a stable 4.2V to 5.5V supply. Place a 100nF decoupling capacitor as close as possible to each VDD pin and a 10uF bulk capacitor near the MCU. For battery-powered designs, use the nanoWatt XLP sleep modes with wake-up timers to minimize average current consumption. The LCD driver can operate in sleep mode, allowing display updates without waking the CPU.
For CTMU-based capacitive touch applications, follow Microchip application notes for PCB layout. Use guard rings around touch sensors, maintain consistent trace lengths, and avoid ground plane fills directly under touch electrodes. The LCD bias voltage generation requires careful layout of the charge pump capacitors - place them close to the LCD driver pins with short, wide traces to minimize ripple on the display bias voltage.
Do not confuse the PIC18F66K90 (LCD + CTMU) with the PIC18F66K40 (no LCD, no CTMU) - they share the same package but have different peripheral sets. The /I suffix indicates industrial temperature grade (-40C to +85C); the /E variant extends to -40C to +125C for automotive. When migrating code, verify that the CTMU registers and LCD control registers are only accessed on K90 variants to avoid undefined behavior on K40 or K80 devices.
Compliance Information
RoHS compliant per Microchip product page. Industrial temperature grade -40C to +85C. For automotive applications, consider AEC-Q100 qualified variants or the extended temperature /E version.
