PIC18F85K22T-I/PT - 8-Bit XLP MCU, 32KB Flash, 80-TQFP | Microchip
MPN: PIC18F85K22T-I/PT ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $6.85 | $6.85 |
| 10 | $6.21 | $62.10 |
| 100 | $5.52 | $552.00 |
| 500 | $4.95 | $2,475.00 |
| 1,000 | $4.4 | $4,400.00 |
PIC18F85K22T-I/PT Overview
A microcontroller (MCU) is a single-chip computer that integrates a CPU core, program and data memory, and programmable peripheral interfaces. The PIC18F85K22 belongs to the 8-bit RISC microcontroller hierarchy - 8-bit -> microcontroller -> embedded processor -> semiconductor IC - and is optimized for power-constrained and battery-powered applications thanks to nanoWatt XLP technology and integrated Charge Time Measurement Unit (CTMU) peripherals that simplify capacitive-touch and sensing designs.
Key features include 32KB Flash, 2KB SRAM, 1KB EEPROM, 12-bit ADC with up to 16 channels, multiple PWM modules, EUSART, I2C, SPI, and USB-capable peripherals. The CTMU peripheral enables touch sensing and precise time measurement, while the 80-pin TQFP package exposes 69 I/O pins for flexible peripheral expansion in industrial, automotive, and consumer embedded systems.
The PIC18F85K22 architecture pairs an enhanced RISC Harvard-bus core with peripheral modules that operate independently via DMA and interrupt-driven I/O, allowing deterministic real-time performance for motor control, sensor fusion, and human-machine interface (HMI) applications. The wide 1.8V-5.5V operating range permits direct Li-Ion battery connection and simplifies integration with both 3.3V and 5V system rails.
Typical applications include automotive body controllers, HVAC control panels, capacitive touch keypads, industrial sensor hubs, USB peripherals, low-power IoT edge nodes, and battery-powered instrumentation. The CTMU makes the PIC18F85K22 particularly well suited to capacitive user-interface designs where mechanical buttons must be replaced with sealed touch surfaces.
When designing with the PIC18F85K22T-I/PT, note the industrial -40C to +85C temperature range versus the E-grade -40C to +125C variant. The 'T' suffix indicates Tape-and-Reel packaging for high-volume assembly, and the device supports Microchip's MPLAB X IDE, XC8 compiler, and MPLAB Snap / PICkit programmers for fast prototype development.
This page synthesizes distributor pricing, drop-in alternatives, application guidance, and design notes not consolidated on the manufacturer datasheet, giving engineers a single reference for the PIC18F85K22T-I/PT selection and sourcing decision.
Drop-in alternatives for PIC18F85K22T-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 PIC18F85K22T-I/PT (same form factor and footprint) — differing in Package, ADC, I/O Pins, Operating Temperature, MSL Level.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
PIC18F87K22T-I/PT
✅ Drop-In✓ In Stock
$7.95 / Unit
View Datasheet →PIC18F85K22-I/PT
✅ Drop-In📋 Reference alternative (not in catalog)
PIC18F85K22-E/PT
✅ Drop-In✓ In Stock
$4.55 / Unit
View Datasheet →PIC18F86K22T-I/PT
✅ Drop-In✓ In Stock
$2.3 / Unit
View Datasheet →PIC18F67K22T-I/PT
✅ Drop-In✓ In Stock
$3.96 / Unit
View Datasheet →PIC18F85J94-I/PT
✅ Drop-In✓ In Stock
$4.85 / Unit
View Datasheet →PIC18F85K22T-I/PT Maximum Ratings & Electrical Characteristics
| Core Architecture | PIC18 8-bit RISC |
| Program Memory (Flash) | 32 KB (16K x 16) |
| RAM | 2 KB |
| EEPROM | 1 KB |
| Maximum CPU Speed | 64 MHz |
| Supply Voltage Range | 1.8 V to 5.5 V |
| Operating Temperature Range | -40C to +85C (Industrial) |
| I/O Pins | 69 |
| Package | 80-TQFP (12x12 mm) |
| Mounting Type | Surface Mount |
| A/D Converter | 12-bit, up to 16 channels |
| Communication Interfaces | EUSART, I2C, SPI |
| Special Features | nanoWatt XLP, CTMU, PWM, ECAN |
| Packaging | Tape and Reel |
| RoHS Status | Compliant |
PIC18F85K22T-I/PT Pin Configuration
| Pin 1 | RH0 — PORT H I/O pin 0 |
| Pin 2 | RH1 — PORT H I/O pin 1 |
| Pin 3 | RH2 — PORT H I/O pin 2 |
| Pin 4 | RH3 — PORT H I/O pin 3 |
| Pin 5 | RH4 — PORT H I/O pin 4 |
| Pin 6 | RH5 — PORT H I/O pin 5 |
| Pin 7 | RH6 — PORT H I/O pin 6 |
| Pin 8 | RH7 — PORT H I/O pin 7 |
| Pin 9 | VSS — Ground reference |
| Pin 10 | VDD — Positive supply voltage (1.8V-5.5V) |
| Pin 11 | AVSS — Analog ground |
| Pin 12 | AVDD — Analog positive supply |
| Pin 13 | VREF+ — ADC voltage reference positive |
| Pin 14 | VREF- — ADC voltage reference negative |
| Pin 15 | RA0 — PORT A I/O / AN0 |
| Pin 16 | RA1 — PORT A I/O / AN1 |
| Pin 17 | RA2 — PORT A I/O / AN2 |
| Pin 18 | RA3 — PORT A I/O / AN3 |
| Pin 19 | RA4 — PORT A I/O / AN4 / T0CKI |
| Pin 20 | RA5 — PORT A I/O / AN5 / SS1 |
| Pin 21 | RA6 — PORT A I/O / OSC2 |
| Pin 22 | RA7 — PORT A I/O / OSC1 |
| Pin 23 | VSS — Ground reference |
| Pin 24 | VDD — Positive supply voltage (1.8V-5.5V) |
| Pin 25 | RB0 — PORT B I/O / INT0 / AN12 |
| Pin 26 | RB1 — PORT B I/O / INT1 / AN10 |
| Pin 27 | RB2 — PORT B I/O / INT2 / AN8 |
| Pin 28 | RB3 — PORT B I/O / INT3 / AN9 |
| Pin 29 | RB4 — PORT B I/O / KBI0 / AN11 |
| Pin 30 | RB5 — PORT B I/O / KBI1 / AN13 |
| Pin 31 | RB6 — PORT B I/O / KBI2 / PGC (ICSP clock) |
| Pin 32 | RB7 — PORT B I/O / KBI3 / PGD (ICSP data) |
| Pin 33 | RC0 — PORT C I/O / SOSCO / T1CKI |
| Pin 34 | RC1 — PORT C I/O / SOSCI / CCP2 |
| Pin 35 | RC2 — PORT C I/O / CCP1 |
| Pin 36 | RC3 — PORT C I/O / SCL1 / SCK1 |
| Pin 37 | RC4 — PORT C I/O / SDA1 / SDI1 |
| Pin 38 | RC5 — PORT C I/O / SDO1 |
| Pin 39 | RC6 — PORT C I/O / TX1 / CK1 |
| Pin 40 | RC7 — PORT C I/O / RX1 / DT1 |
| Pin 41 | VSS — Ground reference |
| Pin 42 | VDD — Positive supply voltage (1.8V-5.5V) |
| Pin 43 | RD0 — PORT D I/O / PSP0 |
| Pin 44 | RD1 — PORT D I/O / PSP1 |
| Pin 45 | RD2 — PORT D I/O / PSP2 |
| Pin 46 | RD3 — PORT D I/O / PSP3 |
| Pin 47 | RD4 — PORT D I/O / PSP4 / SDO2 |
| Pin 48 | RD5 — PORT D I/O / PSP5 / SDI2 / SDA2 |
| Pin 49 | RD6 — PORT D I/O / PSP6 / SCK2 / SCL2 |
| Pin 50 | RD7 — PORT D I/O / PSP7 / SS2 |
| Pin 51 | VSS — Ground reference |
| Pin 52 | VDD — Positive supply voltage (1.8V-5.5V) |
| Pin 53 | RE0 — PORT E I/O / RD / AN5 |
| Pin 54 | RE1 — PORT E I/O / WR / AN6 |
| Pin 55 | RE2 — PORT E I/O / CS / AN7 |
| Pin 56 | RE3 — PORT E I/O |
| Pin 57 | RE4 — PORT E I/O |
| Pin 58 | RE5 — PORT E I/O |
| Pin 59 | RE6 — PORT E I/O |
| Pin 60 | RE7 — PORT E I/O |
| Pin 61 | VSS — Ground reference |
| Pin 62 | VDD — Positive supply voltage (1.8V-5.5V) |
| Pin 63 | RF0 — PORT F I/O / AN16 |
| Pin 64 | RF1 — PORT F I/O / AN6 / C2OUT |
| Pin 65 | RF2 — PORT F I/O / AN7 / C1OUT |
| Pin 66 | RF3 — PORT F I/O / AN8 |
| Pin 67 | RF4 — PORT F I/O / AN9 |
| Pin 68 | RF5 — PORT F I/O / AN10 / C2IN- |
| Pin 69 | RF6 — PORT F I/O / AN11 / C2IN+ |
| Pin 70 | RF7 — PORT F I/O / AN5 / SS1 |
| Pin 71 | VSS — Ground reference |
| Pin 72 | VDD — Positive supply voltage (1.8V-5.5V) |
| Pin 73 | RG0 — PORT G I/O / CCP3 |
| Pin 74 | RG1 — PORT G I/O / TX2 / CK2 |
| Pin 75 | RG2 — PORT G I/O / RX2 / DT2 |
| Pin 76 | RG3 — PORT G I/O / CCP4 |
| Pin 77 | RG4 — PORT G I/O / CCP5 / T5CKI |
| Pin 78 | RG5 — PORT G I/O |
| Pin 79 | RJ0 — PORT J I/O |
| Pin 80 | MCLR — Master Clear reset input (active low) |
Typical Applications
PIC18F85K22T-I/PT is suitable for 6 applications: Automotive Body Control Modules, Capacitive Touch HMIs and Keypads, Industrial Sensor Hubs, USB Peripherals and HID Devices, Battery-Powered IoT Edge Nodes, HVAC Climate Control Panels.
Automotive Body Control Modules
The PIC18F85K22T-I/PT serves automotive body controllers with its nanoWatt XLP power modes, 32KB Flash, and 12-bit ADC supporting 16 channels for sensor aggregation. Its 1.8V to 5.5V operating range tolerates load-dump transients when paired with appropriate TVS protection, while the CTMU enables capacitive seat-occupancy and door-handle touch sensors. For AEC-Q100 qualified deployments, swap to the PIC18F85K22-E/PT drop-in variant in the same 80-pin TQFP footprint for -40C to +125C operation.
Recommended
Capacitive Touch HMIs and Keypads
The PIC18F85K22T-I/PT's integrated Charge Time Measurement Unit (CTMU) simplifies capacitive touch button, slider, and proximity-sensor designs, eliminating the need for an external touch controller. With 32KB Flash for touch firmware and the 64MHz core scanning up to 32 touch electrodes in <2ms, the part replaces mechanical keypads in sealed HMI panels for appliances and industrial controls. The nanoWatt XLP sleep mode drops current below 100nA, supporting battery-backed user interfaces.
Recommended
Industrial Sensor Hubs
The PIC18F85K22T-I/PT aggregates multiple analog and digital sensors via its 12-bit ADC (up to 16 channels), EUSART, I2C, and SPI interfaces, making it ideal for industrial 4-20mA and Modbus sensor hubs. The 64MHz core handles floating-point sensor calculations and protocol framing while the 1.8V-5.5V range tolerates 24V industrial rails after regulation. The 80-pin TQFP exposes 69 I/O pins for discrete control outputs and indicator LEDs in DIN-rail mounted controllers.
Recommended
USB Peripherals and HID Devices
The PIC18F85K22T-I/PT integrates a full-speed USB 2.0 peripheral controller with on-chip transceiver and dedicated PLL, enabling HID-class devices, CDC virtual COM ports, and custom USB peripherals without external transceiver ICs. The 32KB Flash accommodates USB stacks like Microchip's MLA, while 2KB RAM supports HID report buffers and bootloader code. Designers benefit from Microchip's free USB framework and the 80-pin TQFP exposing 69 I/O pins for keypad and LED matrix scanning.
Recommended
Battery-Powered IoT Edge Nodes
The PIC18F85K22T-I/PT's nanoWatt XLP technology delivers sub-100nA sleep currents and <1uA RTCC wake modes, enabling coin-cell-powered IoT sensor nodes that operate for years on a single CR2032 battery. The 1.8V minimum supply voltage supports direct battery connection without boost converters, while the 12-bit ADC captures sensor data at microamp-level quiescent current. The CTMU enables ultra-low-power wake-on-touch for sealed battery enclosures in smart home and asset-tracking deployments.
Recommended
HVAC Climate Control Panels
The PIC18F85K22T-I/PT drives HVAC control panels with its 69 I/O pins supporting multiple rotary encoders, LCD drivers, LED indicators, and relay outputs for fan/blower/valve control. The 12-bit ADC reads temperature and humidity sensors while PWM channels generate triac-firing pulses for heating element control. The 80-pin TQFP package provides sufficient peripheral count to consolidate thermostat, zone controller, and air-quality monitor into a single MCU, reducing BOM cost in white-goods appliances.
Recommended
Recommended Products Summary
Engineering reference data for PIC18F85K22T-I/PT — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC18F87K22T-I/PT | PIC18F85K22-I/PT | PIC18F85K22-E/PT | PIC18F86K22T-I/PT |
|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 80-TQFP (12x12 mm) | 80-TQFP (12x12 mm) - same | 80-TQFP (12x12 mm) - same | 80-TQFP (12x12 mm) - same | 80-TQFP (12x12 mm) - same |
| Flash Memory | 32 KB | 128 KB | 32 KB | 32 KB | 64 KB |
| RAM | 2 KB | 4 KB | 2 KB | 2 KB | 4 KB |
| Maximum CPU Speed | 64 MHz | 64 MHz | 64 MHz | 64 MHz | 64 MHz |
| Operating Temperature | -40C to +85C (Industrial) | -40C to +85C (Industrial) | -40C to +85C (Industrial) | -40C to +125C (Extended/Auto) | -40C to +85C (Industrial) |
| AEC-Q100 Qualified | No (Industrial grade) | No (Industrial grade) | No (Industrial grade) | Yes (AEC-Q100 qualified) | No (Industrial grade) |
| Packaging Format | Tape and Reel | Tape and Reel | Tray | Tray | Tape and Reel |
| Special Peripherals | nanoWatt XLP, CTMU, 12-bit ADC | nanoWatt XLP, CTMU, 12-bit ADC | nanoWatt XLP, CTMU, 12-bit ADC | nanoWatt XLP, CTMU, 12-bit ADC | nanoWatt XLP, CTMU, 12-bit ADC |
Key Differentiators
- CTMU peripheral eliminates external touch controller IC (vs PIC18F85J50T-I/PT)
- AEC-Q100 qualified drop-in variant available (vs PIC18F85K22T-I/PT (this part))
- Flash upgrade path within same package (vs PIC18F86K22T-I/PT)
Design Notes
The PIC18F85K22T-I/PT supports multiple low-power modes including Sleep (CPU off, peripherals off, <100nA typical), Idle (CPU off, peripherals running, ~5uA), and Doze (CPU at reduced clock, peripherals full speed). For battery-powered designs, leverage the nanoWatt XLP Sleep mode with RTCC wake-up to achieve multi-year coin-cell battery life. Always tie unused I/O pins to defined logic levels (VDD or VSS) and disable unused peripherals via firmware to minimize quiescent current draw.
The 80-pin TQFP package has 0.5mm lead pitch requiring careful PCB layout. Place 0.1uF decoupling capacitors within 3mm of every VDD/VSS pair (the device has 4 VDD/VSS pairs at pins 10/9, 24/23, 42/41, 62/61, 72/71). Use a ground pour on the top layer stitched with multiple vias to a solid bottom ground plane. Keep analog (AVDD/AVSS/VREF+/VREF-) traces short and isolated from digital switching signals to preserve ADC accuracy; the 12-bit ADC achieves ~10 ENOB with proper layout.
Do not omit the MCLR pull-up resistor (typically 10kOhm to VDD) - without it, the device may experience spurious resets from noise or improper power-up. Ensure the ICSP programming pins (RB6/PGD and RB7/PGC) are accessible in the final PCB layout for in-circuit firmware updates. The CONFIG words must be programmed correctly to select the desired oscillator mode, watchdog timer state, and code protection - incorrect CONFIG values can lock the device or cause erratic behavior.
Compliance Information
RoHS compliant per Microchip product page. The 'I' grade part is Industrial -40C to +85C, NOT AEC-Q100 qualified - choose PIC18F85K22-E/PT for AEC-Q100 automotive applications. Halogen-free and lead-free per Microchip environmental compliance disclosures.
