PIC18F85K90-E/PT - 32KB Flash 8-bit MCU w/ LCD & CTMU | Microchip
MPN: PIC18F85K90-E/PT ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $5.65 | $5.65 |
| 10 | $5.09 | $50.90 |
| 100 | $4.52 | $452.00 |
| 500 | $4.05 | $2,025.00 |
| 1,000 | $3.62 | $3,620.00 |
PIC18F85K90-E/PT Overview
An 8-bit microcontroller (MCU) is a single-chip computer that combines a CPU, program memory, data memory, peripherals, and I/O on one die. PIC18F devices belong to the enhanced 8-bit family of PIC microcontrollers, sitting inside the broader category of microcontrollers -> microprocessors -> semiconductors -> integrated circuits. The 'K90' series specifically targets battery-powered LCD applications, integrating a segmented LCD driver, a Charge Time Measurement Unit (CTMU) for capacitive touch, and nanoWatt XLP sleep modes to extend battery life in always-on products.
Key features of the PIC18F85K90-E/PT include the integrated LCD driver capable of up to 192 segments across 4 common lines, the CTMU peripheral with 24 channels supporting capacitive-touch sensing, the nanoWatt XLP idle/sleep modes that draw microamp-level current, and dual 5-bit DAC reference trim that lets the LCD bias tracks supply changes. Communications peripherals include UART, SPI, I2C, and USB 2.0 full-speed on select family members. The device also integrates 12-bit ADC, comparators, PWM, and a hardware RTCC with calendar mode.
Typical applications for the PIC18F85K90-E/PT include medical devices such as glucose meters and infusion pumps, industrial control HMIs and metering, consumer white goods with LCD user interfaces, portable instrumentation, automotive clusters, and battery-powered metering. The combination of LCD + CTMU + low-power modes lets designers build touch-key panels with segmented displays that run for years on coin-cell or two-AA batteries.
When designing with the PIC18F85K90-E/PT, ensure the PCB layout keeps the analog AVSS/AVDD pair cleanly isolated from digital switching currents and reserve one or two pins as dedicated CTMU reference for touch-key calibration across PCB manufacturing variation.
Drop-in alternatives for PIC18F85K90-E/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 PIC18F85K90-E/PT (same form factor and footprint) — differing in Package, ADC, I/O Pins, RAM, Core Architecture.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
PIC18F85K90-I/PT
✅ Drop-In📋 Reference alternative (not in catalog)
PIC18F85K90T-I/PT
✅ Drop-In✓ In Stock
$4.85 / Unit
View Datasheet →PIC18F86K90-I/PT
✅ Drop-In✓ In Stock
$4.32 / Unit
View Datasheet →PIC18F85K22-E/PT
✅ Drop-In✓ In Stock
$4.55 / Unit
View Datasheet →PIC18F85J90-I/PT
✅ Drop-In✓ In Stock
$4.5 / Unit
View Datasheet →PIC18F67K90-I/PT
✅ Drop-In✓ In Stock
$7.55 / Unit
View Datasheet →PIC18F85K90-E/PT Maximum Ratings & Electrical Characteristics
| Series | PIC® XLP™ 18K |
| Family | PIC18F87K90 |
| Core Processor | PIC 8-bit |
| Program Memory | 32 KB Flash |
| RAM | 2 KB |
| EEPROM | 1 KB |
| Maximum CPU Frequency | 64 MHz |
| Instruction Throughput | 16 MIPS |
| Operating Voltage Range | 1.8 V to 5.5 V |
| I/O Pins | 70 |
| Package | 80-pin TQFP (PT), 12 x 12 mm |
| Mounting Type | Surface Mount |
| Temperature Grade | Extended (-40 °C to +125 °C) |
| A/D Converter | 12-bit, multiple channels |
| LCD Driver | Up to 192 segments, 4 commons |
| CTMU Channels | 24 (capacitive touch) |
| Low-Power Technology | nanoWalt XLP |
| Communication Peripherals | UART, SPI, I2C |
| PWM Channels | Multiple (capture/compare/PWM) |
| RoHS Status | Compliant |
| MSL Level | 3 |
PIC18F85K90-E/PT Pin Configuration
| Pin 1 | SEG0 — LCD segment 0 |
| Pin 2 | SEG1 — LCD segment 1 |
| Pin 3 | SEG2 — LCD segment 2 |
| Pin 4 | SEG3 — LCD segment 3 |
| Pin 5 | SEG4 — LCD segment 4 |
| Pin 6 | SEG5 — LCD segment 5 |
| Pin 7 | SEG6 — LCD segment 6 |
| Pin 8 | SEG7 — LCD segment 7 |
| Pin 9 | SEG8 — LCD segment 8 |
| Pin 10 | SEG9 — LCD segment 9 |
| Pin 11 | SEG10 — LCD segment 10 |
| Pin 12 | SEG11 — LCD segment 11 |
| Pin 13 | SEG12 — LCD segment 12 |
| Pin 14 | SEG13 — LCD segment 13 |
| Pin 15 | SEG14 — LCD segment 14 |
| Pin 16 | SEG15 — LCD segment 15 |
| Pin 17 | SEG16 — LCD segment 16 |
| Pin 18 | SEG17 — LCD segment 17 |
| Pin 19 | SEG18 — LCD segment 18 |
| Pin 20 | SEG19 — LCD segment 19 |
| Pin 21 | SEG20 — LCD segment 20 |
| Pin 22 | SEG21 — LCD segment 21 |
| Pin 23 | SEG22 — LCD segment 22 |
| Pin 24 | SEG23 — LCD segment 23 |
| Pin 25 | COM0 — LCD common 0 |
| Pin 26 | COM1 — LCD common 1 |
| Pin 27 | COM2 — LCD common 2 |
| Pin 28 | COM3 — LCD common 3 |
| Pin 29 | VLCD1 — LCD bias voltage 1 |
| Pin 30 | VLCD2 — LCD bias voltage 2 |
| Pin 31 | VLCD3 — LCD bias voltage 3 |
| Pin 32 | AVDD — Analog supply |
| Pin 33 | AVSS — Analog ground |
| Pin 34 | RA0/AN0 — Analog/digital I/O |
| Pin 35 | RA1/AN1 — Analog/digital I/O |
| Pin 36 | RA2/AN2 — Analog/digital I/O |
| Pin 37 | RA3/AN3 — Analog/digital I/O |
| Pin 38 | RA4/AN4 — Analog/digital I/O |
| Pin 39 | RA5/AN5 — Analog/digital I/O |
| Pin 40 | RA6 — Digital I/O |
| Pin 41 | RA7 — Digital I/O |
| Pin 42 | VDD — Digital supply |
| Pin 43 | VSS — Digital ground |
| Pin 44 | RB0/INT0 — I/O with external interrupt |
| Pin 45 | RB1/INT1 — I/O with external interrupt |
| Pin 46 | RB2/INT2 — I/O with external interrupt |
| Pin 47 | RB3/INT3 — I/O with external interrupt |
| Pin 48 | RB4 — Digital I/O |
| Pin 49 | RB5 — Digital I/O |
| Pin 50 | RB6/ICSCLK — I/O / ICD clock |
| Pin 51 | RB7/ICSDAT — I/O / ICD data |
| Pin 52 | RC0 — Digital I/O |
| Pin 53 | RC1 — Digital I/O |
| Pin 54 | RC2 — Digital I/O |
| Pin 55 | RC3 — Digital I/O |
| Pin 56 | RC4 — Digital I/O |
| Pin 57 | RC5 — Digital I/O |
| Pin 58 | RC6 — Digital I/O |
| Pin 59 | RC7 — Digital I/O |
| Pin 60 | RD0 — Digital I/O |
| Pin 61 | RD1 — Digital I/O |
| Pin 62 | RD2 — Digital I/O |
| Pin 63 | RD3 — Digital I/O |
| Pin 64 | RD4 — Digital I/O |
| Pin 65 | RD5 — Digital I/O |
| Pin 66 | RD6 — Digital I/O |
| Pin 67 | RD7 — Digital I/O |
| Pin 68 | RE0 — Digital I/O |
| Pin 69 | RE1 — Digital I/O |
| Pin 70 | RE2 — Digital I/O |
| Pin 71 | RE3 — Digital I/O |
| Pin 72 | RE4 — Digital I/O |
| Pin 73 | RE5 — Digital I/O |
| Pin 74 | RE6 — Digital I/O |
| Pin 75 | RE7 — Digital I/O |
| Pin 76 | RF0 — Digital I/O |
| Pin 77 | RF1 — Digital I/O |
| Pin 78 | RF2 — Digital I/O |
| Pin 79 | RF3 — Digital I/O |
| Pin 80 | RF4 — Digital I/O |
Typical Applications
PIC18F85K90-E/PT is suitable for 6 applications: Medical Infusion Pumps & Glucose Meters, Industrial Metering & HMI Panels, Consumer White Goods with Touch LCD, Portable Test & Measurement, Automotive Dashboard & Climate HMI, Battery-Powered IoT Sensor Nodes.
Medical Infusion Pumps & Glucose Meters
The PIC18F85K90-E/PT's integrated segmented LCD driver (up to 192 segments), 12-bit ADC, and nanoWalt XLP sleep modes make it ideal for battery-powered medical devices such as insulin pumps and blood-glucose meters. The 32 KB Flash accommodates dosing firmware, calibration tables, and a real-time clock scheduler with alarm wake-up, while the 1.8-5.5 V operating range supports two-AA direct connection. CTMU capacitive touch replaces mechanical buttons, enabling sealed enclosures that meet IP54 cleaning requirements. Designers can place the MCU directly between the battery and the LCD, simplifying BOM and reducing quiescent current.
Recommended
Industrial Metering & HMI Panels
For industrial flow meters, energy monitors, and process-control HMIs, the PIC18F85K90-E/PT delivers 70 I/O pins plus an integrated LCD driver that can drive 4-common/192-segment glass without external chips. The hardware RTCC with calendar mode logs time-stamped measurements while nanoWalt XLP keeps idle draw under 1 uA between scans. UART/SPI/I2C peripherals support MODBUS RTU bridges and isolated RS-485 transceivers. The 16 MIPS throughput handles PID loops with sub-millisecond update rates typical of valve-position controllers.
Recommended
Consumer White Goods with Touch LCD
The PIC18F85K90-E/PT powers white-good HMIs ranging from microwave ovens to washing-machine front panels. Its 24-channel CTMU adds sleek capacitive touch keys behind glass overlays, while the 192-segment LCD driver drives direct-segment status displays without an external charge pump. The 1.8-5.5 V supply range lets the same MCU run from rectified 5 V mains adapters or battery backups. Sleep current under 1 uA in XLP mode extends standby life for products that spend most of their day idle.
Recommended
Portable Test & Measurement
Handheld multimeters, insulation testers, and calibration instruments use the PIC18F85K90-E/PT for its 12-bit ADC, segmented-LCD readout, and battery-friendly XLP modes. The 32 KB Flash stores measurement firmware, range tables, and user preferences, while the 2 KB SRAM buffers waveform captures and RMS computations. The integrated RTCC time-stamps log entries for ISO-17025 traceability. Designers route the analog inputs through the dedicated AVDD/AVSS pair to maximize ADC linearity across the 1.8-5.5 V supply range.
Recommended
Automotive Dashboard & Climate HMI
Automotive instrument clusters, climate-control faceplates, and HVAC HMIs leverage the PIC18F85K90-E/PT's -40 °C to +125 °C extended temperature grade plus its segmented LCD driver and CTMU touch channels. The device tolerates automotive load-dump transients when paired with a TVS-protected supply rail, and its PWM channels drive stepper-based gauge pointers. CAN-style communication is added via an external MCP2515 SPI controller, while the internal UART handles LIN slaves for seat/mirror modules.
Recommended
Battery-Powered IoT Sensor Nodes
For IoT sensor nodes that need a local segmented display plus multi-year coin-cell life, the PIC18F85K90-E/PT is a strong fit. nanoWalt XLP sleep currents under 1 uA let a CR2032 cell last years when waking only on RTCC tick or external interrupt. The 24 CTMU channels handle touch buttons, while the integrated LCD driver shows status text on a 96-segment glass display. UART/SPI/I2C interfaces connect to low-power radio modules like the MRF89XA or external sensors over I2C.
Recommended
Recommended Products Summary
Engineering reference data for PIC18F85K90-E/PT — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC18F85K90-I/PT | PIC18F85K90T-I/PT | PIC18F86K90-I/PT | PIC18F85K22-E/PT | PIC18F85J90-I/PT |
|---|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 80-pin TQFP (PT) | 80-pin TQFP (PT) - same | 80-pin TQFP (PT) - same | 80-pin TQFP (PT) - same | 80-pin TQFP (PT) - same | 80-pin TQFP (PT) - same |
| Flash Memory | 32 KB | 32 KB | 32 KB | 64 KB | 32 KB | 32 KB |
| Operating Voltage | 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 | 2.0 V to 3.6 V |
| Temperature Grade | Extended -40 °C to +125 °C | Industrial -40 °C to +85 °C | Industrial -40 °C to +85 °C | Industrial -40 °C to +85 °C | Extended -40 °C to +125 °C | Industrial -40 °C to +85 °C |
| LCD Driver | Up to 192 segments, 4 commons | Up to 192 segments | Up to 192 segments | Up to 192 segments | None | Up to 192 segments |
| CTMU Touch Channels | 24 | 24 | 24 | 24 | None | None |
| Low-Power Technology | nanoWatt XLP | nanoWatt XLP | nanoWatt XLP | nanoWatt XLP | nanoWatt XLP | nanoWatt |
| Price @ 100 pcs | $4.52 | $4.20 | $4.20 | $5.10 | $3.95 | $4.35 |
Key Differentiators
- Integrated segmented LCD driver with up to 192 segments (vs PIC18F85K22-E/PT)
- 24-channel CTMU capacitive-touch hardware (vs PIC18F85J90-I/PT)
- Extended -40 °C to +125 °C temperature grade (vs PIC18F85K90-I/PT)
- 1.8 V to 5.5 V single-supply operation (vs PIC18F85J90-I/PT)
Design Notes
Place a 100 nF decoupling capacitor within 5 mm of every VDD/AVDD pin and a single bulk 10 uF tantalum or ceramic on the main supply trace. The PIC18F85K90-E/PT can run from a CR2032 coin cell when the firmware stays in nanoWatt XLP sleep, but verify the LCD charge-pump current against the cell's pulse capability. For mains-powered designs, a TVS diode on VDD clamps automotive load-dump transients above 5.5 V.
Keep the analog AVSS/AVDD pair isolated from noisy digital return paths with a star-ground or cut-and-jumper approach. Route CTMU capacitive-touch traces as short, narrow, guarded tracks on a top-layer pour that mirrors the touch-pad geometry. Avoid crossing high-frequency switching nodes (PWM, SPI clocks) over LCD segment traces to prevent ghost-segment artifacts at high contrast levels.
Do not exceed 5.5 V on any VDD pin — the PIC18F85K90-E/PT is not 5 V tolerant on analog pins above AVDD. Configure the unused I/O as outputs low rather than inputs to avoid shoot-through current. The /MCLR pin must be pulled high through a 10 kohm resistor to VDD unless in-circuit serial programming is unused, in which case tie directly to VDD. Always sequence the LCD charge pump enable only after the segment data is set.
For SPI peripherals running above 4 MHz, place 33 ohm series resistors near the driver pins to dampen ringing on long PCB traces. The CTMU current source must be calibrated at production using a known capacitor to compensate for process and PCB parasitic variation. Use the RTCC with an external 32.768 kHz crystal for time-stamping battery-backed events; internal oscillator drift will accumulate minutes per day.
Compliance Information
RoHS and REACH compliant per Microchip product environmental certifications; the -E suffix denotes the AEC-Q100-qualified extended temperature grade suitable for automotive applications.
