PIC18F66J94-I/PT - 64KB Flash, USB/LCD, 8-bit MCU | Microchip
N.º da peça: PIC18F66J94-I/PT ✓ Ativo| Qtd. | Preço unitário | Total |
|---|---|---|
| 1 | $7.9 | $7,90 |
| 10 | $7.1 | $71,00 |
| 100 | $6.4 | $640,00 |
| 500 | $5.75 | $2.875,00 |
| 1.000 | $5.1 | $5.100,00 |
PIC18F66J94-I/PT Visão geral
An 8-bit microcontroller (MCU) is a single-chip computer built around a CPU with an 8-bit data path, on-chip program and data memory, and integrated peripherals. Within the broader hierarchy, the PIC18F66J94 sits in the MCU > microcontroller > embedded controller > semiconductor tree, and it is a member of the PIC18 family of Microchip's 8-bit PIC architecture, the family that introduced enhanced mid-range instructions, hardware multiply, and C-friendly addressing. The part is positioned as a 'system-on-chip' for cost-sensitive applications that still need USB, an LCD glass, and ultra-low standby power.
Key features include 64 KB Flash (32K x 16), 4 KB RAM, hardware 12-bit A/D, two I2C, two SPI, four USART, 10 PWM channels, 8 timers, 3 comparators, a Charge Time Measurement Unit (CTMU) for capacitive touch, a hardware Real-Time Clock/Calendar (RTCC) with Vbat domain, and an integrated charge pump that generates the LCD bias voltage. This level of analog and communication integration eliminates many external ICs that competing 8-bit designs still require.
Typical applications include USB-connected industrial control panels, battery-backed metering (electricity/gas/water) with on-glass LCD, portable medical point-of-care devices, e-meter/energy-monitoring front-ends, USB medical/scientific instrument data loggers, and capacitive-touch user interfaces. The wide 2.0-3.6V Vdd range and 250 nA typical RTCC current from Vbat allow multi-year coin-cell operation in metering applications.
Designers should plan PCB layout with separate analog/digital ground returns, keep the 12-bit A/D reference decoupling within 5 mm of the AVdd/AVss pins, and reserve a 4.7 uF bulk + 0.1 uF bypass pair on Vbat to preserve RTCC accuracy across battery swaps. Pin 1 orientation, I/O remapping, and PPS configuration must be set in the configuration words before the first C statement to avoid locked I/O states.
This page synthesizes verified distributor pricing, pin-compatible drop-in alternatives from the same Microchip PIC18F66Jxx family, and practical design notes that go beyond the manufacturer datasheet to accelerate schematic capture and BOM selection.
Alternativas drop-in para PIC18F66J94-I/PT — mesmo encapsulamento, compatível pino a pino. Peças de encapsulamento diferente que exigem retrabalho na PCB são excluídas.
Variantes desta série
Modelos da mesma série compatíveis como drop-in com PIC18F66J94-I/PT (mesmo formato e footprint) — diferindo em ADC, Package, Program Memory (Flash), LCD Driver, Operating Temperature.
Ferramenta de comparação rápida — selecione peças alternativas para comparação lado a lado:
PIC18F66J94T-I/PT
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
PIC18F65J94-I/PT
✅ Drop-In ⚠️ Especificações não verificadas✓ Em estoque
$3.89 / unidade
Ver ficha técnica →PIC18F66J90-I/PT
✅ Drop-In ⚠️ Especificações não verificadas📋 Alternativa de referência (fora do catálogo)
PIC18F66J55-I/PT
✅ Drop-In ⚠️ Especificações não verificadas✓ Em estoque
$4.31 / unidade
Ver ficha técnica →PIC18F66J94-I/PT Classificações máximas e características elétricas
| Family | PIC18FxxJ94 (PIC18 J-series) |
| Core | PIC18 8-bit RISC CPU |
| Program Memory (Flash) | 64 KB (32K x 16) |
| Data Memory (RAM) | 4 KB |
| Maximum CPU Speed | 64 MHz (16 MIPS) |
| Operating Voltage (Vdd) | 2.0 V to 3.6 V |
| Temperatura de operação | -40 C to +85 C (Industrial, -I) |
| Encapsulamento | 64-pin TQFP (PT), 10 x 10 x 1 mm |
| ADC | 12-bit A/D converter |
| USB | USB 2.0 Full-Speed Device/Embedded Host |
| LCD Driver | Integrated, up to 256 segments, with charge pump |
| Communication Interfaces | 2x I2C, 2x SPI, 4x USART, USB |
| PWM Channels | 10 |
| Timers | 8 |
| Comparators | 3 |
| Special Peripherals | CTMU (touch), RTCC, hardware multiply |
| Low-Power Technology | nanoWatt XLP |
| Tipo de montagem | Surface Mount |
| Status RoHS | Compliant |
Guia de Configuração de Pinos do PIC18F66J94-I/PT 64-pin tqfp (pt), 10 x 10 x 1 mm
Configuração de pinos para PIC18F66J94-I/PT (pacote 64-pin tqfp (pt), 10 x 10 x 1 mm). Este CI digital inclui GPIO, interfaces de comunicação (UART, SPI, I2C) e pinos de alimentação. Consulte o datasheet do fabricante para funções alternativas dos pinos e opções de configuração. Essencial para projeto de sistemas embarcados e layout de PCB.
Nenhum dado detalhado de pinagem disponível para PIC18F66J94-I/PT.
Consulte a ficha técnica para a configuração completa dos pinos.
Aplicações típicas
PIC18F66J94-I/PT é adequado para 7 aplicaçãos: USB-Connected Industrial Control Panel, Battery-Backed Electricity Meter with LCD, Portable Medical Data Acquisition Device, Capacitive-Touch HMI Front Panel, USB Scientific Instrument Data Logger, USB Smart Home Sensor Hub, Automotive Aftermarket Diagnostic Dongle.
USB-Connected Industrial Control Panel
The PIC18F66J94-I/PT is well suited to USB-connected industrial control panels because it integrates a full-speed USB 2.0 device controller (no external PHY needed), 64 KB of Flash for USB stack plus application code, and 12-bit A/D for analog sensor readout. The 64 MHz/16 MIPS PIC18 core runs Microchip's free USB stack, HID class, or CDC class with sufficient headroom for a small GUI on the segmented LCD. Designers route the USB D+/D- lines with 90-ohm differential impedance and provide a 4.7 uF bulk + 0.1 uF bypass near Vdd; the part eliminates an external USB transceiver and reduces BOM cost. Compared to a discrete USB-to-UART bridge plus separate MCU, the integrated approach saves 2-3 ICs and ~30% board area.
Recomendado
Battery-Backed Electricity Meter with LCD
The PIC18F66J94-I/PT is an ideal fit for battery-backed electricity meters because it integrates a hardware Real-Time Clock/Calendar (RTCC) with Vbat domain (typical 250 nA standby), a segmented LCD driver with charge pump (up to 256 segments), and nanoWatt XLP technology for multi-year coin-cell life. The 12-bit A/D samples voltage and current CTs at 4 ksps with 0.1% accuracy, while the LCD directly drives a 7-segment glass display without a separate driver IC. The wide 2.0-3.6 V Vdd range accepts a single lithium cell or two alkaline cells. Typical standby current is below 1 uA, allowing 10+ years of operation from a CR2032 in low-traffic metering applications.
Recomendado
Portable Medical Data Acquisition Device
The PIC18F66J94-I/PT suits portable medical data-acquisition devices because its 12-bit A/D at up to 16 channels provides enough resolution for vital-sign analog front ends (temperature, SpO2 current source, ECG) and its full-speed USB enables direct tethering to a host PC for data download. The -I grade's -40C to +85C operating range covers clinical environments, while nanoWatt XLP keeps sleep current below 1 uA between measurements to extend battery life. The CTMU peripheral implements capacitive-touch buttons without an external touch IC, and the segmented LCD shows instantaneous readings without waking the main CPU. This single-chip integration replaces 3-4 discrete ICs versus competing solutions.
Recomendado
Capacitive-Touch HMI Front Panel
The PIC18F66J94-I/PT excels in capacitive-touch HMI front panels thanks to its on-chip Charge Time Measurement Unit (CTMU), which supports up to 32 touch buttons without an external touch controller IC. Combined with the segmented LCD driver for visual feedback and the 10 PWM channels for LED dimming/backlight control, this part replaces a separate touch IC, LCD driver, and LED driver. The CTMU measures capacitance changes of ~0.1 pF, enabling reliable touch through 3 mm acrylic overlays. The 16 MIPS CPU handles touch scanning, LED animations, and LCD refresh concurrently, and nanoWatt XLP keeps idle panels below 50 uA total system current.
Recomendado
USB Scientific Instrument Data Logger
The PIC18F66J94-I/PT is a strong fit for USB scientific instrument data loggers because its 64 KB Flash stores Microchip's USB CDC stack plus user logging firmware, while its 4 KB RAM buffers samples between USB transfers. The 12-bit A/D (with optional 10-bit mode for faster sampling) handles sensor inputs at up to 100 ksps, and the four USARTs interface to GPS, Bluetooth, or RS-485 sensors. The RTCC timestamps each sample to within 1 second across battery swaps via the Vbat domain. Industrial -I temperature grade ensures accurate measurements in field-deployed environments, and the integrated USB avoids an external bridge chip.
Recomendado
USB Smart Home Sensor Hub
The PIC18F66J94-I/PT is a good choice for USB smart-home sensor hubs because its full-speed USB connects to a host gateway or directly to a PC, while 2x I2C, 2x SPI, and 4x USART interface simultaneously with multiple sensors (temperature, humidity, motion, gas). The 64 KB Flash stores a small RTOS or cooperative scheduler plus sensor drivers, and the 12-bit A/D reads analog sensors directly. nanoWatt XLP allows the hub to sleep between sensor readings at <2 uA while maintaining USB suspend current compliance. The segmented LCD shows local readings without waking the host, useful for wall-mounted sensor displays.
Recomendado
Automotive Aftermarket Diagnostic Dongle
The PIC18F66J94-I/PT (industrial -I grade) is suitable for automotive aftermarket diagnostic dongles that operate inside the cabin, where ambient temperatures stay within -40C to +85C. Its full-speed USB connects to a laptop or tablet running OBD-II software, while the 4 USARTs interface to ELM327-style AT command processors or directly to CAN transceivers via SPI. The 12-bit A/D monitors battery voltage and accessory signals, and the RTCC timestamps diagnostic events. Designers should note that for under-hood applications exceeding +85C, the -I grade is insufficient and the PIC18F66J94-E/PT (extended) or a different AEC-Q100 part is required.
Recomendado
Resumo dos produtos recomendados
Dados de referência de engenharia para PIC18F66J94-I/PT — comparação, orientação de projeto e informações de conformidade.
Guia de seleção
Comparação com alternativas
| Parâmetro | Este produto | PIC18F66J94T-I/PT | PIC18F65J94-I/PT | PIC18F66J90-I/PT | PIC18F66J55-I/PT |
|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 64-TQFP (PT) 10x10 mm | 64-TQFP (PT) 10x10 mm - same | 64-TQFP (PT) 10x10 mm - same | 64-TQFP (PT) 10x10 mm - same | 64-TQFP (PT) 10x10 mm - same |
| Program Memory (Flash) | 64 KB | 64 KB | 32 KB | 64 KB | 64 KB |
| Data Memory (RAM) | 4 KB | 4 KB | 4 KB | 4 KB | 4 KB |
| Maximum Clock Speed | 64 MHz / 16 MIPS | 64 MHz / 16 MIPS | 64 MHz / 16 MIPS | 64 MHz / 16 MIPS | 48 MHz / 12 MIPS |
| USB Controller | USB 2.0 FS Device/Host | USB 2.0 FS Device/Host | USB 2.0 FS Device/Host | No USB | No USB |
| LCD Driver | Yes (up to 256 segments) | Yes | Yes | Yes | No |
| Operating Voltage | 2.0 V to 3.6 V | 2.0 V to 3.6 V | 2.0 V to 3.6 V | 2.0 V to 3.6 V | 2.0 V to 3.6 V |
| ADC | 12-bit | 12-bit | 12-bit | 12-bit | 10-bit |
Principais diferenciais
- Integrated USB 2.0 FS Device/Host + LCD driver + RTCC in a single 64-pin MCU (vs PIC18F66J90-I/PT)
- Larger 64 KB Flash for USB stack plus application firmware (vs PIC18F65J94-I/PT)
- 12-bit ADC with higher precision for sensor and metering applications (vs PIC18F66J55-I/PT)
Notas de projeto
Place a 4.7 uF bulk tantalum or ceramic capacitor and a 0.1 uF ceramic bypass directly on the Vdd/Vss pins of the PIC18F66J94-I/PT. The USB controller draws short bursts of up to 50 mA during frame transmission, and the Vbat pin should have a separate 4.7 uF + 0.1 uF pair to keep RTCC timekeeping accurate during coin-cell battery swaps. Estimated: assume 50 mA USB suspend current budget per USB 2.0 spec.
Route the USB D+/D- lines as a 90-ohm differential pair with controlled impedance, keep total length under 50 mm, and place a 15 kV ESD protection array (e.g., USBLC6-2SC6) near the USB connector. The segmented LCD glass connections should be guarded from digital switching traces to avoid injecting common-mode noise onto the bias voltage generated by the on-chip charge pump.
Do not leave the I/O pins floating during reset - the PIC18F66J94 enables internal weak pull-ups by default but external loads can still cause high inrush current. Configure the Peripheral Pin Select (PPS) mapping in the configuration words BEFORE the first C statement in main(), not after, or the USB stack will fail to enumerate. Always set the SOSC pins to drive a 32.768 kHz crystal for RTCC, not a CMOS clock source, to keep the timekeeping within +/- 2 seconds per day.
The PIC18F66J94-I/PT in the 64-pin TQFP (PT) package has a theta_JA of approximately 45 C/W (estimated from typical 64-TQFP datasheets), so at 64 MHz full-load (typical 20 mA Icc) and 3.3 V Vdd, the part dissipates ~66 mW and rises only ~3 C above ambient - no heatsink required. In contrast, switching the LCD charge pump and USB simultaneously can add 5-10 mA, so consider a small copper pour on Vdd to spread heat in enclosed housings.
Informações de conformidade
RoHS compliant per Microchip product page. Industrial -40C to +85C operating range (-I grade), not AEC-Q100 qualified for automotive under-hood. For AEC-Q100 automotive applications, use PIC18FxxK80 or PIC18FxxQ43 family instead.
