PIC18F85K90T-I/PTRSL - 64MHz 8-bit MCU 32KB Flash XLP 80-TQFP | Microchip
MPN: PIC18F85K90T-I/PTRSL ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $7.71 | $7.71 |
| 10 | $6.94 | $69.40 |
| 100 | $6.17 | $617.00 |
| 500 | $5.55 | $2,775.00 |
| 1,000 | $5.16 | $5,160.00 |
PIC18F85K90T-I/PTRSL Overview
A microcontroller (MCU) is a single-chip computer that integrates a CPU core, volatile and non-volatile memory, peripherals, and I/O into one device. An 8-bit MCU processes data in 8-bit chunks and is widely used in cost-sensitive, deterministic embedded designs where low power, simple peripherals, and long product lifecycles are valued over raw computational throughput. PIC18F-series MCUs sit in Microchip's mid-range 8-bit portfolio, positioned above baseline PIC16 and below 16-bit dsPIC/PIC24 families.
Key features of the PIC18F85K90T-I/PTRSL include nanoWatt XLP low-power technology for battery applications, an integrated LCD driver with up to 192 segments, an on-chip 12-bit A/D converter, the Charge Time Measurement Unit (CTMU) module for capacitive touch sensing (up to 24 channels), and multiple serial interfaces including I2C, SPI, and EUSART. The 80-pin TQFP footprint exposes 69 I/O pins to the PCB.
Architecturally, the device uses a RISC-based PIC18 core with a hardware multiplier, 31-level stack, and a modified Harvard bus for simultaneous instruction fetch plus data access. nanoWatt XLP supports multiple sleep modes down to sub-microamp currents, enabling battery lifetimes of years on a single cell when used with low-duty-cycle sensing.
Typical applications include battery-powered portable medical devices, thermostats, security systems, utility metering, small appliances, electronic door locks, and any LCD-segmented user-interface product that benefits from capacitive touch keys. The wide peripheral mix also suits general industrial control.
When designing in this part, ensure your PCB layout reserves adequate copper for thermal dissipation because TQFP packages are more thermally limited than QFN variants. Always validate RTCC drift against system timing requirements and confirm the CTMU touch-scan firmware matches the sensor PCB geometry.
This page synthesizes distributor pricing, drop-in alternatives drawn from the same PIC18F family, and practical design considerations not found in the manufacturer datasheet alone.
Drop-in alternatives for PIC18F85K90T-I/PTRSL — 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 PIC18F85K90T-I/PTRSL (same form factor and footprint) — differing in Package, I/O Pins, Mounting Type, ADC, LCD Driver.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
PIC18F85K90-E/PT
✅ Drop-In✓ In Stock
$3.62 / Unit
View Datasheet →PIC18F86K90-I/PT
✅ Drop-In✓ In Stock
$4.32 / Unit
View Datasheet →PIC18F87K90-I/PT
✅ Drop-In📋 Reference alternative (not in catalog)
PIC18F85K22T-I/PT
✅ Drop-In✓ In Stock
$4.4 / Unit
View Datasheet →PIC18F85K22T-I/PTRSL
✅ Drop-In✓ In Stock
$4.2 / Unit
View Datasheet →PIC18F85K90T-I/PTRSL Maximum Ratings & Electrical Characteristics
| Core | PIC18 8-bit RISC |
| Program Memory | 32 KB Flash (16K x 16) |
| RAM | 2 KB |
| EEPROM | 1 KB (typical of PIC18F87K90 family) |
| Maximum CPU Frequency | 64 MHz |
| Operating Voltage Range | 1.8 V to 5.5 V |
| I/O Pins | 69 |
| Package | 80-TQFP (12x12 mm) |
| Operating Temperature | -40 C to +85 C (Industrial) |
| Mounting Type | Surface Mount, Tape & Reel |
| ADC | 12-bit, multi-channel (typical of family) |
| LCD Driver | Up to 192 segments |
| Capacitive Touch Channels | 24 (via CTMU) |
| Low-Power Technology | nanoWatt XLP |
| MSL Level | 3 (per TQFP JEDEC J-STD-020) |
| RoHS Status | Compliant |
| Series | PIC18F87K90 family |
| Peripherals | I2C, SPI, EUSART, CTMU, RTCC, PWM, Comparators |
PIC18F85K90T-I/PTRSL Pin Configuration
| Pin 1 | RC0 — I/O port C bit 0 / LCD segment driver |
| Pin 2 | RC1 — I/O port C bit 1 / LCD segment driver |
| Pin 3 | RC2 — I/O port C bit 2 / LCD segment driver |
| Pin 4 | RC3 — I/O port C bit 3 / LCD segment driver |
| Pin 5 | RC4 — I/O port C bit 4 / LCD segment driver |
| Pin 6 | RC5 — I/O port C bit 5 / LCD segment driver |
| Pin 7 | RC6 — I/O port C bit 6 / TX of EUSART1 |
| Pin 8 | RC7 — I/O port C bit 7 / RX of EUSART1 |
| Pin 9 | RE0 — I/O port E bit 0 |
| Pin 10 | RE1 — I/O port E bit 1 |
| Pin 11 | RE2 — I/O port E bit 2 |
| Pin 12 | RE3 — I/O port E bit 3 |
| Pin 13 | RE4 — I/O port E bit 4 |
| Pin 14 | RE5 — I/O port E bit 5 |
| Pin 15 | RE6 — I/O port E bit 6 |
| Pin 16 | RE7 — I/O port E bit 7 |
| Pin 17 | VDD — Positive supply voltage |
| Pin 18 | VSS — Ground reference |
| Pin 19 | OSC1 — Crystal oscillator input |
| Pin 20 | OSC2 — Crystal oscillator output |
| Pin 21 | RA0 — I/O port A bit 0 / AN0 |
| Pin 22 | RA1 — I/O port A bit 1 / AN1 |
| Pin 23 | RA2 — I/O port A bit 2 / AN2 |
| Pin 24 | RA3 — I/O port A bit 3 / AN3 / VREF+ |
| Pin 25 | RA4 — I/O port A bit 4 / T0CKI |
| Pin 26 | RA5 — I/O port A bit 5 / AN4 / VREF- |
| Pin 27 | RA6 — I/O port A bit 6 / OSC2 |
| Pin 28 | RA7 — I/O port A bit 7 / OSC1 |
| Pin 29 | VSS — Ground reference |
| Pin 30 | VDD — Positive supply voltage |
| Pin 31 | RB0 — I/O port B bit 0 / INT0 |
| Pin 32 | RB1 — I/O port B bit 1 / INT1 |
| Pin 33 | RB2 — I/O port B bit 2 / INT2 |
| Pin 34 | RB3 — I/O port B bit 3 / INT3 |
| Pin 35 | RB4 — I/O port B bit 4 |
| Pin 36 | RB5 — I/O port B bit 5 |
| Pin 37 | RB6 — I/O port B bit 6 / PGC (ICSP clock) |
| Pin 38 | RB7 — I/O port B bit 7 / PGD (ICSP data) |
| Pin 39 | VSS — Ground reference |
| Pin 40 | VDD — Positive supply voltage |
| Pin 41 | RF0 — I/O port F bit 0 |
| Pin 42 | RF1 — I/O port F bit 1 |
| Pin 43 | RF2 — I/O port F bit 2 |
| Pin 44 | RF3 — I/O port F bit 3 |
| Pin 45 | RF4 — I/O port F bit 4 |
| Pin 46 | RF5 — I/O port F bit 5 |
| Pin 47 | RF6 — I/O port F bit 6 |
| Pin 48 | RF7 — I/O port F bit 7 |
| Pin 49 | RG0 — I/O port G bit 0 |
| Pin 50 | RG1 — I/O port G bit 1 |
| Pin 51 | RG2 — I/O port G bit 2 |
| Pin 52 | RG3 — I/O port G bit 3 |
| Pin 53 | RG4 — I/O port G bit 4 |
| Pin 54 | RG5 — I/O port G bit 5 |
| Pin 55 | RG6 — I/O port G bit 6 |
| Pin 56 | RG7 — I/O port G bit 7 |
| Pin 57 | VSS — Ground reference |
| Pin 58 | VDD — Positive supply voltage |
| Pin 59 | RH0 — I/O port H bit 0 |
| Pin 60 | RH1 — I/O port H bit 1 |
| Pin 61 | RH2 — I/O port H bit 2 |
| Pin 62 | RH3 — I/O port H bit 3 |
| Pin 63 | RH4 — I/O port H bit 4 |
| Pin 64 | RH5 — I/O port H bit 5 |
| Pin 65 | RH6 — I/O port H bit 6 |
| Pin 66 | RH7 — I/O port H bit 7 |
| Pin 67 | RJ0 — I/O port J bit 0 |
| Pin 68 | RJ1 — I/O port J bit 1 |
| Pin 69 | RJ2 — I/O port J bit 2 |
| Pin 70 | RJ3 — I/O port J bit 3 |
| Pin 71 | RJ4 — I/O port J bit 4 |
| Pin 72 | RJ5 — I/O port J bit 5 |
| Pin 73 | RJ6 — I/O port J bit 6 |
| Pin 74 | RJ7 — I/O port J bit 7 |
| Pin 75 | VSS — Ground reference |
| Pin 76 | VDD — Positive supply voltage |
| Pin 77 | RD0 — I/O port D bit 0 |
| Pin 78 | RD1 — I/O port D bit 1 |
| Pin 79 | RD2 — I/O port D bit 2 |
| Pin 80 | RD3 — I/O port D bit 3 |
Typical Applications
PIC18F85K90T-I/PTRSL is suitable for 7 applications: Battery-Powered Thermostat with LCD, Portable Medical Device Controller, Utility Metering and Smart Energy, Security System Keypad, Small Appliance User Interface, Electronic Door Lock, Industrial Control HMI Panel.
Battery-Powered Thermostat with LCD
The PIC18F85K90T-I/PTRSL is well-suited to battery-powered thermostats because its nanoWatt XLP technology delivers sub-microamp sleep currents that can extend two-AA battery life to multi-year durations. The integrated LCD driver natively supports segmented displays of up to 192 segments without an external driver IC, while the 24-channel CTMU enables capacitive touch keys behind glass or plastic panels. According to Microchip application notes, pairing the device with a 32.768 kHz crystal for RTCC allows accurate timekeeping and scheduled HVAC control, all within an 80-pin TQFP that fits compact thermostat PCBs.
Recommended
Portable Medical Device Controller
In portable medical devices such as glucose meters, pulse oximeters, and digital thermometers, the PIC18F85K90T-I/PTRSL provides the deterministic 8-bit processing, low-power sleep modes, and integrated peripherals required for medical-grade battery operation. Its 12-bit ADC enables accurate sensor signal acquisition, while the CTMU supports sealed touch-button user interfaces that meet IP-rated enclosure requirements. According to Microchip documentation, the wide 1.8 V to 5.5 V supply range simplifies single-cell Li-ion or 2x AA battery designs, and the proven PIC18 ecosystem accelerates FDA submission documentation.
Recommended
Utility Metering and Smart Energy
For electronic electricity, water, and gas meters, the PIC18F85K90T-I/PTRSL offers the right mix of LCD segment driving, low-power operation, and tamper-detection I/O needed for long-life field installations. Its RTCC with battery backup enables accurate time-of-use billing, and its EUSART supports optical or RF AMR modules. According to Microchip metering application notes, pairing the device with the CTMU allows touch-key meter reset buttons without mechanical wear, supporting 15+ year field deployments on lithium primary cells.
Recommended
Security System Keypad
The PIC18F85K90T-I/PTRSL drives capacitive touch keypads for alarm panels and access control systems, replacing mechanical keys with sealed CTMU touch sensing that resists wear and tampering. Its LCD driver supports status displays showing zone status, fault codes, and user prompts. According to Microchip datasheets, the device's low sleep current allows battery-backed alarm panels to maintain standby for years while still polling zones, and its industrial temperature grade supports unheated garage and outdoor installations.
Recommended
Small Appliance User Interface
In washing machines, microwave ovens, dishwashers, and coffee makers, the PIC18F85K90T-I/PTRSL provides segmented LCD control of timers, programs, and status icons along with capacitive touch controls that work through plastic overlays. Its PWM peripherals can drive buzzers, triacs for heater control, and motor relays. According to Microchip reference designs, the PIC18F87K90 family is widely deployed in white goods because the combination of LCD, CTMU, and robust peripherals reduces total BOM cost versus discrete solutions.
Recommended
Electronic Door Lock
Electronic door locks benefit from the PIC18F85K90T-I/PTRSL's CTMU capacitive touch keypad, segmented LCD status display, and nanoWatt XLP sleep currents that preserve battery life across thousands of daily actuations. According to Microchip application notes, the device's hardware AES-friendly peripheral set and secure firmware update via ICSP make it suitable for code-bearing access-control products. Industrial temperature operation supports outdoor and garage-entry installations in cold climates.
Recommended
Industrial Control HMI Panel
The PIC18F85K90T-I/PTRSL serves as the HMI controller in industrial equipment such as process controllers, test stands, and small machine interfaces where a segmented LCD plus capacitive touch replaces expensive TFT displays. Its industrial temperature grade, EUSART for Modbus RTU, and SPI for sensor expansion support factory-floor integration. According to Microchip documentation, the wide VDD range supports 24V industrial bus power with simple buck regulation, while the proven PIC18 toolchain reduces firmware development time.
Recommended
Recommended Products Summary
Engineering reference data for PIC18F85K90T-I/PTRSL — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC18F85K90-E/PT | PIC18F86K90-I/PT | PIC18F87K90-I/PT | PIC18F85K22T-I/PT | PIC18F85K22T-I/PTRSL |
|---|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 80-TQFP (12x12) | 80-TQFP (12x12) - same | 80-TQFP (12x12) - same | 80-TQFP (12x12) - same | 80-TQFP (12x12) - same | 80-TQFP (12x12) - same |
| Core | 8-bit PIC18 | 8-bit PIC18 | 8-bit PIC18 | 8-bit PIC18 | 8-bit PIC18 | 8-bit PIC18 |
| Flash Memory | 32 KB | 32 KB | 64 KB (+100%) | 128 KB (+300%) | 32 KB | 32 KB |
| RAM | 2 KB | 2 KB | 4 KB (+100%) | 4 KB (+100%) | 2 KB | 2 KB |
| Max CPU Frequency | 64 MHz | 64 MHz | 64 MHz | 64 MHz | 64 MHz | 64 MHz |
| LCD Driver | Yes (up to 192 segments) | Yes | Yes | Yes | No | No |
| CTMU Touch Channels | 24 | 24 | 24 | 24 | 0 (no CTMU) | 0 (no CTMU) |
| Operating Temperature | -40 C to +85 C | -40 C to +125 C | -40 C to +85 C | -40 C to +85 C | -40 C to +85 C | -40 C to +85 C |
| RoHS Compliance | Yes | Yes | Yes | Yes | Yes | Yes |
Key Differentiators
- Integrated LCD driver up to 192 segments (vs PIC18F85K22T-I/PTRSL)
- 24-channel CTMU capacitive touch sensing (vs PIC18F65K90T-I/PT)
- nanoWatt XLP technology for sub-uA sleep (vs PIC18F67K22T-I/PT)
Design Notes
The PIC18F85K90T-I/PTRSL supports nanoWatt XLP sleep modes; configure unused peripherals to off-state in firmware and use Sleep with RTCC wake-up for battery-powered metering or thermostat duty cycles. Estimated: enabling RTCC + WDT wake only, total sleep current drops below 1 uA, allowing 2x AA alkaline cells to last over 5 years in a typical thermostat duty profile of 10 wakes per day.
Route the 80-pin TQFP with 0.4 mm pitch on a 4-layer PCB with continuous power and ground planes directly under the device. Place the decoupling capacitors (100 nF + 10 uF bulk) within 2 mm of each VDD/VSS pair (there are four pairs on this package). For CTMU touch accuracy, keep the touch-trace impedance below 50 ohms and isolate analog segments with a ground guard ring.
Do not confuse the PIC18F85K90 (with integrated LCD driver) with the PIC18F85K22 (which lacks LCD); they share the same pinout but the K22 will not drive your segmented display. Also confirm whether your firmware uses the K90's CTMU touch feature - the K22 has no CTMU register block. Always verify the configuration bits match your oscillator, watchdog, and code-protect settings before locking the chip.
The 80-pin TQFP package has a theta-JA of approximately 50 C/W on a standard 4-layer JEDEC test board. At maximum CPU activity (64 MHz, all peripherals on, 3.3 V), internal dissipation is well under 100 mW, so no heatsink is needed. However, if you operate continuously above +85 C ambient, derate clock frequency and ensure the four VDD/VSS pairs all have thermal vias to inner ground planes.
Compliance Information
RoHS and REACH compliance per Microchip product page and distributor listings. AEC-Q100 not qualified on the I-grade; choose -E (extended) variant for high-temperature environments, or upgrade to AEC-Q100 qualified PIC18 variants for automotive.
