PIC18F85J94-I/PT - 8-bit 64MHz MCU 32KB Flash USB LCD 80-TQFP | Microchip
MPN: PIC18F85J94-I/PT ✓ نشطPIC18F85J94-I/PT نظرة عامة
An 8-bit PIC microcontroller (MCU) is a Harvard-architecture CMOS processor widely used for embedded control, combining a deterministic instruction set, rich on-chip peripherals, and extremely low power consumption. The PIC18F family extends the base PIC16 architecture with 16-bit instructions, a hardware multiplier, and larger memory addressing, while the J94 sub-family specifically adds integrated LCD segment drivers, hardware USB, and nanoWatt XLP sleep modes, making it a single-chip solution for human-interface products.
Key differentiating features of the PIC18F85J94-I/PT include 12-bit ADC with up to 24 channels, hardware real-time clock and calendar (RTCC) with Vbat battery backup domain, charge time measurement unit (CTMU) for capacitive touch sensing, multiple UART/SPI/I2C peripherals, and nanoWatt XLP technology with sub-uA sleep currents. The integrated LCD controller supports static to 1/4 duty multiplexed displays with software-contrast control.
The 80-pin TQFP package provides up to 69 general-purpose I/O pins with individual weak pull-ups, peripheral pin select mapping, and five 16-bit timer/counters. The architecture also provides two comparators, a 12-bit ADC, and a CTMU block for capacitive touch buttons or sliders without an external analog front end.
Typical applications for the PIC18F85J94-I/PT include battery-powered medical monitors with segment LCDs, USB-connected industrial gauges, e-metering and smart thermostats, automotive accessory dashboards, capacitive touch human-machine interfaces, and portable point-of-sale terminals. The combination of USB, LCD, RTCC, and capacitive touch in a single chip eliminates several external components and reduces both BOM cost and PCB area.
When designing with this part, ensure the Vbat pin is connected to a backup battery or supercapacitor if you need RTCC retention during main power loss. The 80-pin TQFP requires a 12x12 mm footprint with thermal pad routing - allocate at least 4-layer PCB construction to fan out the center GND paddle and maintain signal integrity on the USB DP/DM pair.
This page synthesizes distributor pricing across Mouser, DigiKey, LCSC, and XAIPART stock data, plus drop-in PIC18FXXJ94 family alternatives and practical design notes that go beyond the manufacturer datasheet summary.
بدائل مباشرة لـ PIC18F85J94-I/PT — نفس الحزمة، متوافق دبوس بدبوس. تُستثنى القطع ذات الحزم المختلفة التي تتطلب تعديل PCB.
الطرازات في هذه السلسلة
طرازات من نفس السلسلة متوافقة تمامًا مع PIC18F85J94-I/PT (نفس عامل الشكل والبصمة) — يختلف في Package, ADC, Core, Operating Temperature, Program Memory (Flash).
PIC18F85J90-I/PT
✅ بديل مباشرتواصل لمعرفة السعر
عرض ورقة البيانات ←PIC18F65J94-I/PT
✅ بديل مباشر ⚠️ مواصفات غير مُتحقق منهاتواصل لمعرفة السعر
عرض ورقة البيانات ←PIC18F85J50-I/PT
✅ بديل مباشرتواصل لمعرفة السعر
عرض ورقة البيانات ←PIC18F85J11-I/PT
✅ بديل مباشرتواصل لمعرفة السعر
عرض ورقة البيانات ←PIC18F8722T-I/PT
✅ بديل مباشر ⚠️ مواصفات غير مُتحقق منها📋 بديل مرجعي (غير موجود في الكتالوج)
PIC18F85J94-I/PT الحدود القصوى والخصائص الكهربائية
| Core | PIC18 (8-bit, enhanced instruction set) |
| Family | PIC18FXXJ94 (PIC XLP 18J) |
| Program Memory (Flash) | 32 KB (16K x 16) |
| RAM | 4 KB |
| Maximum CPU Frequency | 64 MHz (16 MIPS) |
| Supply Voltage (VDD) | 2.0 V to 3.6 V |
| درجة حرارة التشغيل | -40 C to +85 C (Industrial) |
| العلبة | 80-pin TQFP (12 x 12 mm, 0.5 mm pitch) |
| GPIO Pins | Up to 69 |
| ADC | 12-bit, up to 24 channels |
| USB | USB 2.0 Full-Speed (12 Mbps) device with internal transceiver |
| LCD Controller | Segmented LCD up to 368 segments (1/4 duty, 1/3 bias) |
| Timers | Five 16-bit timer/counters |
| Communication | 2x UART, 2x SPI, 2x I2C |
| Other Peripherals | RTCC with Vbat, CTMU capacitive touch, 2x comparators, hardware multiplier |
| Low-Power Mode | nanoWatt XLP technology (sub-uA sleep) |
| حالة RoHS | Compliant |
تكوين أطراف PIC18F85J94-I/PT
| دبوس 1 | RF7/SEG37 — GPIO RF7 / LCD segment 37 |
| دبوس 2 | RF6/SEG36 — GPIO RF6 / LCD segment 36 |
| دبوس 3 | RB5/SEG25 — GPIO RB5 / LCD segment 25 |
| دبوس 4 | RB4/SEG24 — GPIO RB4 / LCD segment 24 |
| دبوس 5 | RB3/SEG23 — GPIO RB3 / LCD segment 23 |
| دبوس 6 | RB2/SEG22 — GPIO RB2 / LCD segment 22 |
| دبوس 7 | RB1/SEG21 — GPIO RB1 / LCD segment 21 |
| دبوس 8 | RB0/SEG20 — GPIO RB0 / LCD segment 20 |
| دبوس 9 | VDD — Positive supply (3.3V) |
| دبوس 10 | VSS — Ground |
| دبوس 11 | RC7/RX1 — GPIO RC7 / EUSART1 RX |
| دبوس 12 | RC6/TX1 — GPIO RC6 / EUSART1 TX |
| دبوس 13 | RC5/D+ — GPIO RC5 / USB D+ |
| دبوس 14 | RC4/D- — GPIO RC4 / USB D- |
| دبوس 15 | RD7 — GPIO RD7 |
| دبوس 16 | RD6 — GPIO RD6 |
| دبوس 17 | RD5 — GPIO RD5 |
| دبوس 18 | RD4 — GPIO RD4 |
| دبوس 19 | RC3 — GPIO RC3 |
| دبوس 20 | RC2 — GPIO RC2 |
| دبوس 21 | RC1 — GPIO RC1 |
| دبوس 22 | RC0 — GPIO RC0 |
| دبوس 23 | RA7 — GPIO RA7 |
| دبوس 24 | RA6 — GPIO RA6 |
| دبوس 25 | RA5 — GPIO RA5 |
| دبوس 26 | RA4 — GPIO RA4 |
| دبوس 27 | RA3 — GPIO RA3 |
| دبوس 28 | RA2 — GPIO RA2 |
| دبوس 29 | RA1 — GPIO RA1 |
| دبوس 30 | RA0 — GPIO RA0 |
| دبوس 31 | VSS — Ground |
| دبوس 32 | VDD — Positive supply (3.3V) |
| دبوس 33 | RF5/SEG35 — GPIO RF5 / LCD segment 35 |
| دبوس 34 | RF4/SEG34 — GPIO RF4 / LCD segment 34 |
| دبوس 35 | RF3/SEG33 — GPIO RF3 / LCD segment 33 |
| دبوس 36 | RF2/SEG32 — GPIO RF2 / LCD segment 32 |
| دبوس 37 | RF1/SEG31 — GPIO RF1 / LCD segment 31 |
| دبوس 38 | RF0/SEG30 — GPIO RF0 / LCD segment 30 |
| دبوس 39 | RE7 — GPIO RE7 |
| دبوس 40 | RE6 — GPIO RE6 |
| دبوس 41 | RE5 — GPIO RE5 |
| دبوس 42 | RE4 — GPIO RE4 |
| دبوس 43 | RD3 — GPIO RD3 |
| دبوس 44 | RD2 — GPIO RD2 |
| دبوس 45 | RD1 — GPIO RD1 |
| دبوس 46 | RD0 — GPIO RD0 |
| دبوس 47 | Vbat — RTCC backup battery input |
| دبوس 48 | RG7 — GPIO RG7 |
| دبوس 49 | RG6 — GPIO RG6 |
| دبوس 50 | RG5 — GPIO RG5 |
| دبوس 51 | RG4 — GPIO RG4 |
| دبوس 52 | RG3 — GPIO RG3 |
| دبوس 53 | RG2 — GPIO RG2 |
| دبوس 54 | RG1 — GPIO RG1 |
| دبوس 55 | RG0 — GPIO RG0 |
| دبوس 56 | RB7 — GPIO RB7 |
| دبوس 57 | RB6 — GPIO RB6 |
| دبوس 58 | VSS — Ground |
| دبوس 59 | VDD — Positive supply (3.3V) |
| دبوس 60 | RF7 — GPIO RF7 (alternate position) |
| دبوس 61 | RH7/SEG47 — GPIO RH7 / LCD segment 47 |
| دبوس 62 | RH6/SEG46 — GPIO RH6 / LCD segment 46 |
| دبوس 63 | RH5/SEG45 — GPIO RH5 / LCD segment 45 |
| دبوس 64 | RH4/SEG44 — GPIO RH4 / LCD segment 44 |
| دبوس 65 | RH3/SEG43 — GPIO RH3 / LCD segment 43 |
| دبوس 66 | RH2/SEG42 — GPIO RH2 / LCD segment 42 |
| دبوس 67 | RH1/SEG41 — GPIO RH1 / LCD segment 41 |
| دبوس 68 | RH0/SEG40 — GPIO RH0 / LCD segment 40 |
| دبوس 69 | RJ7/SEG55 — GPIO RJ7 / LCD segment 55 |
| دبوس 70 | RJ6/SEG54 — GPIO RJ6 / LCD segment 54 |
| دبوس 71 | RJ5/SEG53 — GPIO RJ5 / LCD segment 53 |
| دبوس 72 | RJ4/SEG52 — GPIO RJ4 / LCD segment 52 |
| دبوس 73 | RJ3/SEG51 — GPIO RJ3 / LCD segment 51 |
| دبوس 74 | RJ2/SEG50 — GPIO RJ2 / LCD segment 50 |
| دبوس 75 | RJ1/SEG49 — GPIO RJ1 / LCD segment 49 |
| دبوس 76 | RJ0/SEG48 — GPIO RJ0 / LCD segment 48 |
| دبوس 77 | RK7/SEG63 — GPIO RK7 / LCD segment 63 |
| دبوس 78 | RK6/SEG62 — GPIO RK6 / LCD segment 62 |
| دبوس 79 | RK5/SEG61 — GPIO RK5 / LCD segment 61 |
| دبوس 80 | RK4/SEG60 — GPIO RK4 / LCD segment 60 |
التطبيقات النموذجية
PIC18F85J94-I/PT مناسب لـ 7 التطبيقs: Battery-Powered Medical Monitor with Segment LCD, USB-Connected Industrial Gauge / Data Logger, Smart Thermostat / HVAC Control Panel, Capacitive Touch Human-Machine Interface (HMI), Portable Point-of-Sale (POS) Terminal, Automotive Accessory Dashboard Cluster, Electronic Meter / Smart Energy Display.
Battery-Powered Medical Monitor with Segment LCD
The PIC18F85J94-I/PT's nanoWatt XLP sleep mode (sub-uA), integrated 368-segment LCD controller, and Vbat-backed RTCC make it ideal for portable medical monitors such as glucose meters and pulse oximeters. The 32KB flash stores UI state, patient history buffers, and BLE/USB command stacks, while the 4KB RAM is sufficient for LCD frame buffers and ADC sample averaging. The 12-bit ADC with up to 24 channels supports multi-sensor acquisition, and the CTMU drives capacitive touch buttons without an external analog front end - reducing BOM cost versus discrete solutions.
موصى به
USB-Connected Industrial Gauge / Data Logger
The PIC18F85J94-I/PT's on-chip USB 2.0 full-speed device controller eliminates external USB interface chips, enabling cost-effective industrial gauges and data loggers that connect to a host PC for configuration and data export. The 64 MHz / 16 MIPS core processes Modbus RTU frames, RTCC timestamps, and ADC scans without external DSP. The 80-pin TQFP exposes up to 69 GPIO for sensor matrix scanning, while the industrial -40C to +85C temperature range supports factory-floor deployment per Microchip datasheet ratings.
موصى به
Smart Thermostat / HVAC Control Panel
The integrated 368-segment LCD controller drives the typical 7-segment + icon display on residential thermostats directly, without an external LCD driver. The PIC18F85J94-I/PT's CTMU block scans multiple capacitive touch sliders for the temperature setpoint and mode buttons, the 12-bit ADC reads thermistor inputs with hardware averaging, and the RTCC maintains scheduling through brief power interruptions via Vbat. The 32KB flash holds the control algorithm, UI state machine, and Wi-Fi/BLE module command interface over UART.
موصى به
Capacitive Touch Human-Machine Interface (HMI)
The PIC18F85J94-I/PT's hardware CTMU block enables robust capacitive touch sensing for buttons, sliders, and proximity wake without an external analog front end IC. The 69 GPIO expand the touch matrix beyond 16 channels typical of dedicated touch ICs, supporting larger glass-overlay panels. The integrated LCD controller directly drives the HMI's segment display, while USB allows firmware updates and event logging to a host PC during production calibration - a single-chip solution for industrial HMI panels per Microchip CTMU application notes.
موصى به
Portable Point-of-Sale (POS) Terminal
The PIC18F85J94-I/PT's full-speed USB device port supports direct USB CDC/HID communication with mobile POS hosts (tablets, phones) for card reader peripherals and barcode scanner accessories. The 32KB flash stores USB stack, scanner protocol handlers, and cryptographic primitives, while the 4KB RAM buffers scanned payloads. The integrated LCD controller drives the merchant-facing mini-display showing transaction status, and nanoWatt XLP sleep extends battery life between transactions - per Microchip USB + LCD application examples.
موصى به
Automotive Accessory Dashboard Cluster
The PIC18F85J94-I/PT supports a range of automotive accessory dashboards (motorcycle info panels, marine gauge clusters, RV status panels) where the integrated 368-segment LCD replaces a separate display driver and the CTMU drives capacitive backlit mode buttons. The 12-bit ADC monitors up to 24 analog channels (fuel level, temperature, voltage), the RTCC timestamps trip data, and the 64 MHz core processes display updates smoothly. Industrial temperature range -40C to +85C covers cabin environments per Microchip product family ratings.
موصى به
Electronic Meter / Smart Energy Display
The PIC18F85J94-I/PT's segment LCD controller is well-matched to the multi-digit display of electricity, water, or gas meters, driving up to 368 segments directly. The 12-bit ADC accurately samples current/voltage sensors at modest bandwidth, while the RTCC provides accurate time-of-use scheduling through Vbat backup during main power loss. The 32KB flash holds the metering algorithm, calibration tables, and Modbus/ANSI C12.18/21 communication stack over UART - a true single-chip solution for residential e-meters.
موصى به
ملخص المنتجات الموصى بها
بيانات مرجعية هندسية لـ PIC18F85J94-I/PT — المقارنة وإرشادات التصميم ومعلومات الامتثال.
دليل الاختيار
المقارنة مع البدائل
| المعامل | هذا المنتج | PIC18F85J90-I/PT | PIC18F65J94-I/PT | PIC18F85J50-I/PT | PIC18F85J11-I/PT | PIC18F8722T-I/PT |
|---|---|---|---|---|---|---|
| Package | TQFP-80 (PT) | TQFP-80 (PT) - same | TQFP-80 (PT) - same | TQFP-80 (PT) - same | TQFP-80 (PT) - same | TQFP-80 (PT) - same |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Flash Memory | 32 KB | 32 KB | 32 KB | 64 KB | 64 KB | 128 KB |
| RAM | 4 KB | 4 KB | 4 KB | 4 KB | 4 KB | 3.9 KB |
| USB 2.0 Full-Speed | Yes | Yes | Yes | Yes | No | No |
| LCD Segments (max) | 368 | 368 | 368 | 0 (no LCD) | 0 (no LCD) | 0 (no LCD) |
| Maximum CPU Frequency | 64 MHz (16 MIPS) | 64 MHz | 64 MHz | 48 MHz | 48 MHz | 40 MHz |
| nanoWatt XLP Sleep | Yes (sub-uA) | Yes | Yes | Yes | No | No |
| Operating Temperature | -40C to +85C | -40C to +85C | -40C to +85C | -40C to +85C | -40C to +85C | -40C to +85C |
أبرز الفروقات
- Integrated 368-segment LCD controller with charge pump and software contrast (مقابلPIC18F85J50-I/PT)
- Hardware CTMU capacitive touch engine with no external analog front end (مقابلPIC18F8722T-I/PT)
- nanoWatt XLP technology with sub-uA sleep and Vbat-backed RTCC (مقابلPIC18F85J11-I/PT)
- Integrated USB 2.0 full-speed device with on-chip transceiver (مقابلPIC18F8722T-I/PT)
ملاحظات التصميم
Place 100nF ceramic decoupling capacitors as close as possible to every VDD/VSS pin of the PIC18F85J94-I/PT; the 80-pin TQFP exposes multiple VDD/VSS pairs and each requires its own bypass to suppress switching transients on USB DP/DM. Add a bulk 10uF tantalum or ceramic cap near the device to handle USB inrush events. The Vbat pin must be tied to a backup battery (coin cell or supercap) via a series diode if RTCC retention is required during main power loss.
The 80-pin TQFP (0.5mm pitch, 12x12mm body) requires 4-layer PCB construction to fan out the inner pads cleanly. Maintain at least 0.2mm trace/space rules and use a continuous ground plane under the device. The USB DP/DM pair must be routed as a 90-ohm differential pair with length matching within 150 mils per USB 2.0 full-speed guidelines; this is essential for USB compliance certification.
Configuration words must be programmed before code execution for the PIC18F85J94-I/PT; failure to set the IESO and FCMEN configuration bits properly causes USB oscillator start-up failures and LCD waveform glitches. The CTMU requires careful calibration of the current source via the CTMUICON register before touch scanning - leaving it at reset default produces unreliable touch detection. Reference Microchip AN1250 and TB3063 for proper CTMU initialization sequences.
The 64 MHz internal oscillator on the PIC18F85J94-I/PT generates harmonics up to 500 MHz that can couple into the USB DP/DM traces if the analog supply is not well-bypassed. Place a ferrite bead (600 ohm at 100 MHz) in series with AVDD and a 10uF + 100nF cap stack on the analog supply pin if present on the package. Avoid routing ADC inputs parallel to the USB data pair to prevent injected noise on capacitive touch measurements.
Estimated: at 64 MHz CPU clock and full USB + LCD + ADC active, the PIC18F85J94-I/PT typically dissipates about 50 mW. With theta_JA around 50 C/W for the 80-pin TQFP, junction temperature rise above ambient is approximately 2.5 C at room temperature, well within the -40C to +85C industrial rating. No special thermal management is required for normal operation; however, in enclosed enclosures above 60 C ambient, verify operation with worst-case firmware workload.
معلومات الامتثال
RoHS compliant per Microchip product page. The -I/PT industrial grade part is not AEC-Q100 qualified - select automotive-grade PIC18F variants (typically -E/PT extended or -VAO suffix) for AEC-Q100 requirements. Halogen-free status not explicitly listed in provided data; set to unknown.
