PIC18F66K90T-I/PT - 8-bit 64MHz 64KB Flash LCD MCU | Microchip
MPN: PIC18F66K90T-I/PT ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $5.6 | $5.60 |
| 10 | $5.04 | $50.40 |
| 100 | $4.48 | $448.00 |
| 500 | $4.2 | $2,100.00 |
| 1,000 | $3.92 | $3,920.00 |
PIC18F66K90T-I/PT Overview
A PIC microcontroller (Programmable Interface Controller) is a compact RISC-based MCU family from Microchip that combines a CPU core, Flash program memory, RAM, EEPROM, and a rich peripheral set (ADC, UART, SPI, I2C, timers, comparators) on a single silicon die. PIC microcontrollers sit within the broader taxonomy of microcontrollers -> embedded processors -> semiconductors, and the 8-bit PIC18 family specifically occupies the performance-leading tier of Microchip's 8-bit line, adding hardware multipliers, larger linear addressing and C-friendly extensions to the original PIC16 instruction set.
Key features of the PIC18F66K90T-I/PT include nanoWatt XLP extreme-low-power technology with sleep currents measured in nanoamperes, an integrated Charge Time Measurement Unit (CTMU) supporting up to 24 channels of capacitive touch sensing without external touch ICs, a 12-bit A/D converter with up to 16 channels, multiple Enhanced USART, SPI and I2C peripherals, and self-programming Flash for in-field firmware updates. A real-time clock calendar with separate oscillator pins and a wide range of timer/capture/compare/PWM modules further expand its capability.
The device's architecture pairs an 8-bit Harvard CPU with 1024 bytes of data EEPROM, hardware multiply and a single-cycle 8x8 multiplier, providing enough headroom for real-time control loops while preserving the deterministic interrupt response engineers expect from PIC cores. The LCD driver is configurable from 8 to 192 segments, allowing direct multiplexing of character or dot-matrix glass without external charge-pump circuitry, and can remain active in sleep for ultra-low-power meter and appliance designs.
Typical applications include battery-powered LCD meters, white goods user interfaces with capacitive touch keys, medical glucose and infusion monitors, industrial process controllers with segment displays, and remote sensor/HMI nodes where nanoWatt XLP extends operating life from small cells. When designing, select the appropriate TQFP package land pattern (10x10mm) and follow Microchip AN1229 for low-power LCD bias generation, and ensure the I/O voltage domain matches the chosen LCD glass (typically 3V or 5V) to prevent contrast drift.
Drop-in alternatives for PIC18F66K90T-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 PIC18F66K90T-I/PT (same form factor and footprint) — differing in Package, Operating Temperature, Core Architecture, Timers, ADC.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
PIC18F65K90T-I/PT
✅ Drop-In📋 Reference alternative (not in catalog)
PIC18F66K90-I/PT
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View Datasheet →PIC18F66K90-I/PTRSL
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$4.85 / Unit
View Datasheet →PIC18F66K22-I/PT
✅ Drop-In✓ In Stock
$3.96 / Unit
View Datasheet →PIC18F66K80-I/PT
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$2.95 / Unit
View Datasheet →PIC18F66J55-I/PT
✅ Drop-In✓ In Stock
$4.31 / Unit
View Datasheet →PIC18F6680-I/PT
✅ Drop-In📋 Reference alternative (not in catalog)
PIC18F66K90T-I/PT Maximum Ratings & Electrical Characteristics
| Core Architecture | PIC18 8-bit RISC |
| Maximum CPU Frequency | 64 MHz |
| Program Memory (Flash) | 64 KB (32K x 16) |
| Data SRAM | 4 KB |
| Data EEPROM | 1024 bytes |
| Supply Voltage Range | 1.8 V to 5.5 V (datasheet VDD range); typical operating range 2.0-5.5V for Flash and 2.5V for LCD drive; marketing '2.5V/3.3V/5V' |
| Digital I/O Pins | 54 |
| Package | 64-pin TQFP (10x10 mm), 1.0 mm height |
| Mounting Type | Surface Mount |
| ADC | 12-bit, up to 16 channels |
| LCD Driver | Up to 192 segments, integrated charge pump |
| Capacitive Touch Channels (CTMU) | Up to 24 channels |
| Timers | Multiple 8-bit and 16-bit timers (TMR0-TMR6) |
| Communication Peripherals | 2x EUSART, 2x MSSP (SPI/I2C) |
| Operating Temperature | -40 C to +85 C (industrial, 'I' suffix) |
| Low-Power Technology | nanoWatt XLP |
| Self-Programming | Yes (Flash program memory) |
| Packaging Suffix | 'T' = Tape and Reel |
| RoHS Status | Compliant |
PIC18F66K90T-I/PT 64-pin tqfp (10x10 mm), 1.0 mm height Pin Configuration Guide
Pin configuration for PIC18F66K90T-I/PT (64-pin tqfp (10x10 mm), 1.0 mm height 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 PIC18F66K90T-I/PT.
Refer to the datasheet for full pin configuration.
Typical Applications
PIC18F66K90T-I/PT is suitable for 7 applications: Battery-Powered LCD Meters, White Goods and Appliance User Interfaces, Medical Glucose and Infusion Monitors, Industrial Process Controllers with Segment Displays, Automotive Aftermarket HMI and Cluster Displays, Remote Sensor Nodes with Touch UI, Consumer Electronics with Touch and Display.
Battery-Powered LCD Meters
The PIC18F66K90T-I/PT is purpose-built for battery-powered LCD meters such as gas, water, electricity, and parking meters, where its integrated LCD driver eliminates the need for an external charge-pump IC. The on-chip CTMU and 24-channel capacitive touch support both segmented LCD readout and touch-button interfaces on a single die. Combined with nanoWatt XLP sleep current measured in single-digit nanoamperes with LCD and RTCC retained, the K90 enables 5-10 year coin-cell lifetimes. The 64-pin TQFP gives designers flexible port mapping for SPI sensors, UART to a wireless M-Bus/LoRa module, and up to 192 LCD segments for numeric and iconographic display. Companion parts include the PIC18F65K90 for cost-reduced variants and the MCP3421 18-bit ADC for precision metering.
Recommended
White Goods and Appliance User Interfaces
Washing machines, refrigerators, dishwashers and ovens benefit from the PIC18F66K90T-I/PT's combination of integrated 192-segment LCD driver and 24-channel CTMU capacitive touch, allowing engineers to design a single-MCU front panel without dedicated touch and LCD ICs. The 64 MHz / 16 MIPS core handles real-time motor control loops, button debouncing, and capacitive touch scanning concurrently. The industrial -40C to +85C temperature grade supports under-cabinet and garage installations, while the wide 1.8V to 5.5V supply range simplifies design across regions with different mains-derived rails. Engineers can pair it with the PIC18F47K42 for low-cost display-less sub-modules, the MCP2515 CAN module for appliance networking, and the ATECC608B for secure boot authentication.
Recommended
Medical Glucose and Infusion Monitors
Portable medical monitors such as blood glucose meters and ambulatory infusion pumps demand a low-power MCU capable of driving a segment LCD, reading a strip sensor, and waking on a button press without depleting the coin cell. The PIC18F66K90T-I/PT's nanoWatt XLP sleep current with LCD active is single-digit nanoamperes, enabling weeks-to-months of standby life on a single CR2032. The integrated 12-bit ADC with up to 16 channels supports electrochemical strip readout, and the CTMU enables capacitive test-strip insertion detection. The 64 KB Flash accommodates IEC 62304 medical device firmware with revision history, and the 4 KB RAM allows ring-buffer storage of recent measurements. Companion parts include the PIC18F27K42 for sensor front-ends, the MCP6002 op-amp for strip current-to-voltage conversion, and the MCP1640 boost converter for LCD bias.
Recommended
Industrial Process Controllers with Segment Displays
Industrial process controllers and panel meters use the PIC18F66K90T-I/PT to combine a 192-segment LCD readout with 4-20 mA analog loop, Modbus RTU, and digital I/O all on a single chip. The wide 1.8-5.5V supply tolerates 24V industrial rails when paired with an external LDO, and the industrial -40C to +85C grade supports factory floor and outdoor cabinet installations. The 12-bit ADC with 16 channels handles multiple thermocouple/RTD inputs via external front-end amplifiers, and the multiple EUSART/SPI/I2C peripherals allow concurrent Modbus master, sensor I/O and operator-panel communication. Companion parts include the PIC18F47K42 for sub-modules, the MAX31856 thermocouple-to-digital converter, and the ADM3251E isolated RS-232/RS-485 transceiver for galvanic isolation.
Recommended
Automotive Aftermarket HMI and Cluster Displays
The PIC18F66K90T-I/PT drives aftermarket automotive accessories and HMI clusters with integrated 192-segment LCD and 24-channel capacitive touch for steering-wheel buttons and dashboard controls. While the standard I-grade part (-40C to +85C) suits cabin applications, automotive designs requiring AEC-Q100 qualification should step to the Q1-graded variant. The 54 I/O pins drive multiple LED segments, PWM backlights, and LIN bus transceivers concurrently, and the 64 KB Flash is adequate for CAN-LIN gateway and dashboard firmware. Companion parts include the PIC18F26K83 for CAN nodes, the MCP25625 CAN transceiver, and the TLD1125EL LED driver for backlight control.
Recommended
Remote Sensor Nodes with Touch UI
IoT edge nodes and remote sensor hubs with local LCD readouts use the PIC18F66K90T-I/PT for its combination of nanoWatt XLP sleep, integrated LCD, and CTMU touch, allowing local interaction without waking the radio. The device can sleep at single-digit nanoamperes with the LCD and RTCC active, waking on a capacitive touch event or scheduled RTCC alarm. The multiple EUSART and SPI channels interface with LoRa, Sigfox, or Wi-Fi modules, while the 12-bit ADC supports analog environmental sensors. Companion parts include the PIC18F27K42 for power-management sub-MCU, the RN2483 LoRaWAN module, and the MCP9808 I2C temperature sensor.
Recommended
Consumer Electronics with Touch and Display
Consumer products such as home audio amplifiers, smart thermostats, and kitchen scales benefit from the PIC18F66K90T-I/PT's integrated 192-segment LCD and CTMU capacitive touch, replacing two dedicated ICs with one general-purpose MCU. The 64 MHz / 16 MIPS core handles real-time UI animations and rotary encoder sensing, while 4 KB of RAM supports page-based menu rendering. The wide 1.8-5.5V supply simplifies designs running from two AA cells or USB 5V. Companion parts include the PIC18F47K42 for sub-controllers, the MCP73831 Li-Ion charger IC, and the AT24CM02 2-Mbit EEPROM for user preference storage.
Recommended
Recommended Products Summary
Engineering reference data for PIC18F66K90T-I/PT — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC18F65K90T-I/PT | PIC18F66K90-I/PT | PIC18F66K90-I/PTRSL | PIC18F66K22-I/PT | PIC18F66K80-I/PT |
|---|---|---|---|---|---|---|
| Package | TQFP-64 (PT) 10x10 mm | TQFP-64 (PT) 10x10 mm - same | TQFP-64 (PT) 10x10 mm - same | TQFP-64 (PT) 10x10 mm - same | TQFP-64 (PT) 10x10 mm - same | TQFP-64 (PT) 10x10 mm - same |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Flash Memory | 64 KB | 32 KB (-50%) | 64 KB (same) | 64 KB (same) | 64 KB (same) | 64 KB (same) |
| SRAM | 4 KB | 2 KB (-50%) | 4 KB (same) | 4 KB (same) | 4 KB (same) | 3 KB (-25%) |
| EEPROM | 1 KB | 1 KB (same) | 1 KB (same) | 1 KB (same) | 1 KB (same) | 1 KB (same) |
| Integrated LCD Driver | Yes (up to 192 segments) | Yes (up to 192 segments) | Yes (up to 192 segments) | Yes (up to 192 segments) | No | No |
| Capacitive Touch (CTMU) | Yes (24 channels) | Yes (24 channels) | Yes (24 channels) | Yes (24 channels) | No | No |
| Supply Voltage Range | 1.8 V to 5.5 V | 1.8 V to 5.5 V | 1.8 V to 5.5 V | 1.8 V to 5.5 V | 1.8 V to 5.5 V | 1.8 V to 5.5 V |
| Operating Temperature | -40 C to +85 C (industrial) | -40 C to +85 C (industrial) | -40 C to +85 C (industrial) | -40 C to +85 C (industrial) | -40 C to +85 C (industrial) | -40 C to +85 C (industrial) |
Key Differentiators
- Highest Flash density in PIC18F66K90 64-pin TQFP family (vs PIC18F65K90T-I/PT)
- Integrated LCD driver eliminates external charge-pump IC (vs PIC18F66K22-I/PT)
- 24-channel CTMU capacitive touch on-chip (vs PIC18F66K80-I/PT)
- nanoWatt XLP for sub-100 nA sleep with LCD active (vs PIC18F66J55-I/PT)
Design Notes
Estimated: For coin-cell-powered LCD meter designs with the PIC18F66K90T-I/PT, configure nanoWatt XLP sleep modes to retain LCD and RTCC while gating the CPU core. With VLCD charge pump enabled in sleep and RTCC running from SOSC at 32.768 kHz, datasheet typical sleep current is in the single-digit nanoampere range. Enable the write-protected configuration bits via ICSP to prevent unintended modification of the RTCC, watchdog and brown-out reset settings, which can cause 50-200 uA leakage if left in default states.
Route the TQFP-64 land pattern on at least four-layer PCB with continuous ground plane beneath the exposed die pad for thermal dissipation and EMI reduction. Place the VLCD bypass capacitors (typically 0.1 uF X7R) within 2 mm of the VLCD pin to minimize charge-pump ripple, and keep switching converter traces away from the LCD segment outputs to prevent display artifacts. Follow Microchip AN1229 'Low-Power LCD Bias Generation' for the recommended 4.7 uF bulk capacitor on VLCD3 to suppress segment crosstalk at high multiplex duty.
Avoid three common PIC18F66K90T-I/PT design pitfalls: (1) forgetting to disable the CTMU current source when not in use - a 55 uA active CTMU idle current can drain a CR2032 in weeks; (2) using the internal HFINTOSC without enabling the PLL when targeting 64 MHz performance, leading to only 16 MIPS at 16 MHz; (3) leaving the JTAGEN fuse enabled, which can prevent ICSP programming on shared I/O pins and require high-voltage programming to recover. Reference Microchip PIC18F66K90 datasheet DS-39984D section 28 for configuration bit details and errata DS-80000484 for known silicon revisions.
Compliance Information
RoHS and REACH compliant per Microchip product page. Standard industrial -40C to +85C grade; AEC-Q100 Q1 variants exist for automotive applications but are separate part numbers. Halogen-free and lead-free per Microchip green-compliance letter.
