PIC18F87J72-I/PT - 8-bit 48MHz 128KB Flash MCU | Microchip
MPN: PIC18F87J72-I/PT ✓ Hoạt độngPIC18F87J72-I/PT Tóm tắt
A microcontroller (MCU) is a single-chip computer containing a CPU core, program and data memory, and integrated peripherals designed to execute embedded firmware in a standalone system. The PIC18 family sits within Microchip's 8-bit PIC architecture hierarchy, which scales from baseline PIC10/PIC12/PIC16 devices up to high-performance PIC18 parts, ultimately forming the foundation of the broader 32-bit PIC32 line. Energy-metering MCUs combine precision analog signal chains with computation and display driving in a single die, eliminating the need for separate metrology ADCs and LCD driver ICs.
Key features include 70 digital I/O pins, dual USART, SPI, I2C, 132-pixel segmented LCD driver with dedicated charge pump, two op-amps inside the AFE, hardware multiplier, and nanoWatt power management for sleep-mode current below 1 uA. The 24-bit sigma-delta AFE delivers better than 0.1% accuracy across the dynamic range required for IEC 62053-21 / IEC 62053-22 single-phase electricity meters.
The PIC18F87J72 architecture uses an enhanced RISC core with hardware multiply, 16-bit-wide Flash memory bus, and an internal 8 MHz oscillator (PLL-able to 48 MHz). The dual-channel AFE block pairs a programmable-gain amplifier (PGA) with a 16-/24-bit sigma-delta modulator; combined with the 12-bit SAR ADC (12 channels, 100 ksps) the device can simultaneously sample voltage and current while driving the LCD.
Typical applications include single-phase and multi-function electricity meters, smart energy monitors with segmented LCD, power-quality analyzers, solar PV monitoring, industrial process instrumentation, and capacitive-touch user interfaces using the CTMU. The wide operating range (2.0 V to 3.6 V core, 4.2 V to 5.5 V with 5V-tolerant I/O variant noted in datasheet) supports battery-backed metering with line-powered LCD operation.
When designing with this part, allocate PCB area for two differential current-sensor inputs (typically current transformers or shunt resistors) routed to the dedicated SDx/SDy sigma-delta channels with anti-aliasing filters. Decouple VDD/VSS with 100 nF ceramic at each supply pin and provide a local bulk 10 uF for the LCD charge pump; refer to the Microchip energy-meter reference design for the full metrology calibration flow.
Bộ thay thế dễ dàng lắp đặt cho PIC18F87J72-I/PT — cùng gói, chân-to-chân tương thích. Các bộ phận yêu cầu hàn PCB bị loại trừ.
Các biến thể trong loạt này
Các mẫu cùng loạt có thể lắp đặt dễ dàng tương thích với PIC18F87J72-I/PT (cùng hình factor và footprint) — khác nhau ở Package, LCD Driver, ADC, I/O Pins, Core Architecture.
PIC18F87J72T-I/PT
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →PIC18F87J72-E/PT
✅ Drop-In ⚠️ Thông số chưa được xác minh📋 Tham chiếu thay thế (không có trong danh mục)
PIC18F86J72T-I/PT
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →PIC18F87J10-I/PT
✅ Drop-In ⚠️ Thông số chưa được xác minhLiên hệ để biết giá
Xem tài liệu →PIC18F8723-I/PT
✅ Drop-In ⚠️ Thông số chưa được xác minhLiên hệ để biết giá
Xem tài liệu →PIC18F87J72-I/PT Tỷ lệ tối đa & tính chất điện
| Core Architecture | PIC18 (8-bit enhanced RISC) |
| Program Memory | 128 KB Flash (64K x 16) |
| RAM | 4 KB |
| Maximum CPU Speed | 48 MHz (12 MIPS) |
| Supply Voltage (VDD) | 2.0 V to 3.6 V |
| I/O Pins | 70 |
| ADC | 12-bit SAR, 12 channels |
| Analog Front End | Dual-channel 16/24-bit sigma-delta AFE with PGA |
| LCD Driver | 132-pixel segmented LCD with charge pump |
| Communication | 2x USART, SPI, I2C |
| RTCC | Hardware Real-Time Clock and Calendar |
| CTMU | Charge Time Measurement Unit (capacitive touch/temperature) |
| Nhiệt độ hoạt động | -40 C to +85 C (Industrial, -I) |
| Hộp | 80-pin TQFP (PT), 12x12 mm, 1.0 mm height |
| Kiểu lắp đặt | Surface Mount |
| Cấp MSL | 3 (168 hours) |
| Trạng thái RoHS | Compliant |
Cấu hình chân PIC18F87J72-I/PT
| Chân 1 | RG0 — I/O port G bit 0 / LCD segment |
| Chân 2 | RG1 — I/O port G bit 1 / LCD segment |
| Chân 3 | RG2 — I/O port G bit 2 / LCD segment |
| Chân 4 | RG3 — I/O port G bit 3 / LCD segment |
| Chân 5 | RG4 — I/O port G bit 4 / LCD segment |
| Chân 6 | RG5 — I/O port G bit 5 / LCD segment |
| Chân 7 | RG6 — I/O port G bit 6 / LCD segment |
| Chân 8 | RG7 — I/O port G bit 7 / LCD segment |
| Chân 9 | MCLR — Master Clear (reset) input, internal pull-up |
| Chân 10 | VDD — Positive supply for I/O and logic |
| Chân 11 | VSS — Ground reference |
| Chân 12 | OSC1 — Crystal oscillator input / external clock |
| Chân 13 | OSC2 — Crystal oscillator output |
| Chân 14 | RC0 — I/O port C bit 0 / SDI/SDA |
| Chân 15 | RC1 — I/O port C bit 1 / SDO/SCL |
| Chân 16 | RC2 — I/O port C bit 2 |
| Chân 17 | RC3 — I/O port C bit 3 / SCL |
| Chân 18 | RC4 — I/O port C bit 4 / SDA |
| Chân 19 | RC5 — I/O port C bit 5 / SDO |
| Chân 20 | RC6 — I/O port C bit 6 / TX |
| Chân 21 | RC7 — I/O port C bit 7 / RX |
| Chân 22 | RD0 — I/O port D bit 0 |
| Chân 23 | RD1 — I/O port D bit 1 |
| Chân 24 | RD2 — I/O port D bit 2 |
| Chân 25 | RD3 — I/O port D bit 3 |
| Chân 26 | RD4 — I/O port D bit 4 |
| Chân 27 | RD5 — I/O port D bit 5 |
| Chân 28 | RD6 — I/O port D bit 6 / TX |
| Chân 29 | RD7 — I/O port D bit 7 / RX |
| Chân 30 | VSS — Ground reference |
| Chân 31 | VDD — Positive supply |
| Chân 32 | RE0 — I/O port E bit 0 |
| Chân 33 | RE1 — I/O port E bit 1 |
| Chân 34 | RE2 — I/O port E bit 2 |
| Chân 35 | RE3 — I/O port E bit 3 |
| Chân 36 | RE4 — I/O port E bit 4 |
| Chân 37 | RE5 — I/O port E bit 5 |
| Chân 38 | RE6 — I/O port E bit 6 |
| Chân 39 | RE7 — I/O port E bit 7 |
| Chân 40 | RF0 — I/O port F bit 0 |
| Chân 41 | RF1 — I/O port F bit 1 / AN6 |
| Chân 42 | RF2 — I/O port F bit 2 / AN7 |
| Chân 43 | RF3 — I/O port F bit 3 / AN8 |
| Chân 44 | RF4 — I/O port F bit 4 / AN9 |
| Chân 45 | RF5 — I/O port F bit 5 / AN10 / CVREF |
| Chân 46 | RF6 — I/O port F bit 6 / AN11 |
| Chân 47 | RF7 — I/O port F bit 7 / AN5 |
| Chân 48 | RH0 — I/O port H bit 0 / AFE channel |
| Chân 49 | RH1 — I/O port H bit 1 / AFE channel |
| Chân 50 | RH2 — I/O port H bit 2 / AFE channel |
| Chân 51 | RH3 — I/O port H bit 3 / AFE channel |
| Chân 52 | RH4 — I/O port H bit 4 / AFE reference |
| Chân 53 | RH5 — I/O port H bit 5 / AFE reference |
| Chân 54 | RH6 — I/O port H bit 6 / AFE reference |
| Chân 55 | RH7 — I/O port H bit 7 / AFE reference |
| Chân 56 | RJ0 — I/O port J bit 0 / LCD segment |
| Chân 57 | RJ1 — I/O port J bit 1 / LCD segment |
| Chân 58 | RJ2 — I/O port J bit 2 / LCD segment |
| Chân 59 | RJ3 — I/O port J bit 3 / LCD segment |
| Chân 60 | RJ4 — I/O port J bit 4 / LCD segment |
| Chân 61 | RJ5 — I/O port J bit 5 / LCD segment |
| Chân 62 | RJ6 — I/O port J bit 6 / LCD segment |
| Chân 63 | RJ7 — I/O port J bit 7 / LCD segment |
| Chân 64 | VDDCORE — Regulated core supply output (cap to VSS) |
| Chân 65 | VSS — Ground reference |
| Chân 66 | VDD — Positive supply |
| Chân 67 | RA0 — I/O port A bit 0 / AN0 |
| Chân 68 | RA1 — I/O port A bit 1 / AN1 |
| Chân 69 | RA2 — I/O port A bit 2 / AN2 |
| Chân 70 | RA3 — I/O port A bit 3 / AN3 / VREF+ |
| Chân 71 | RA4 — I/O port A bit 4 / T0CKI |
| Chân 72 | RA5 — I/O port A bit 5 / AN4 / VREF- |
| Chân 73 | RB0 — I/O port B bit 0 / INT0 |
| Chân 74 | RB1 — I/O port B bit 1 / INT1 |
| Chân 75 | RB2 — I/O port B bit 2 / INT2 |
| Chân 76 | RB3 — I/O port B bit 3 / INT3 |
| Chân 77 | RB4 — I/O port B bit 4 |
| Chân 78 | RB5 — I/O port B bit 5 |
| Chân 79 | RB6 — I/O port B bit 6 / PGC (ICSP clock) |
| Chân 80 | RB7 — I/O port B bit 7 / PGD (ICSP data) |
Ứng dụng tiêu biểu
PIC18F87J72-I/PT phù hợp cho 7 Áp dụngs: Single-Phase Electricity Meter, Multi-Function Power Quality Analyzer, Solar PV Inverter Monitoring Module, Smart Energy Monitor with Sub-Metering, Industrial Process Instrumentation, Capacitive-Touch User Interface with LCD, Smart Home Energy Gateway Edge Node.
Single-Phase Electricity Meter
The PIC18F87J72-I/PT is purpose-built for class-1 single-phase residential and industrial electricity meters requiring IEC 62053-21/22 compliance. The on-chip dual-channel 16/24-bit sigma-delta AFE with PGA samples voltage and current simultaneously to better than 0.1% accuracy across a 1000:1 dynamic range, while the 12-channel SAR ADC handles auxiliary measurements such as temperature and tamper detection. The integrated 132-pixel LCD driver with charge pump drives the kWh display and load-bar graph directly from a 2.0-3.6 V rail, removing the external metrology ADC and bias-generator ICs that legacy meter designs require. Combined with 128 KB Flash and 12 MIPS throughput, the part runs metrology DSP, RMS calculation, and CTMU tamper scans in a single MCU loop.
Được đề xuất
Multi-Function Power Quality Analyzer
The PIC18F87J72-I/PT supports power-quality analyzers measuring Vrms, Irms, frequency, power factor, harmonic distortion (THD) and per-harmonic energy. The 12 MIPS core executes 1024-point FFT and THD calculations between ADC conversions while the dual AFE channels capture voltage and current at 4 ksps with 24-bit resolution. The 70 I/O drive a graphic-segment LCD (up to 132 pixels) showing waveform summary and harmonic bar chart; the CTMU handles the front-panel capacitive touch keypad without an external touch controller. The hardware RTCC timestamps power-quality events with second-level accuracy over months of logged data stored in the 4 KB RAM or external EEPROM.
Được đề xuất
Solar PV Inverter Monitoring Module
String-level PV monitors using the PIC18F87J72-I/PT measure DC string voltage, current, and inverter output power for residential solar arrays. The 12-bit SAR ADC (12 channels) handles multiple string voltage inputs through resistor dividers, while the 16/24-bit AFE measures string current via Hall-effect or shunt sensors with the on-chip PGA. The CTMU scans the inverter temperature probe for over-temperature shutdown coordination, and the hardware RTCC provides day/night-tariff timestamp logs. The integrated 132-pixel LCD on the inverter front panel reports kWh produced, peak power, CO2 offset and fault codes; nanoWatt sleep drops the idle current below 1 uA during nighttime to preserve battery backup.
Được đề xuất
Smart Energy Monitor with Sub-Metering
Multi-circuit energy monitors (CT-clamp sub-meters for circuit-level measurement) benefit from the PIC18F87J72-I/PT's dual AFE plus SAR ADC combination. The sigma-delta channels measure two CT-clamp current inputs simultaneously, while the 12-bit SAR ADC scans additional voltage and temperature channels for thermal derating. The integrated 132-segment driver drives a multi-screen UI showing per-circuit consumption, peak demand, and time-of-use tariffs; the CTMU module implements the capacitive button panel for selecting circuits. RS485 / Modbus or 2x USART channels connect the monitor to a home-energy gateway without an external transceiver MCU.
Được đề xuất
Industrial Process Instrumentation
The PIC18F87J72-I/PT is well suited to industrial panel meters, weighing-scale controllers, and process-loop indicators that require a built-in LCD, dual precision ADCs and a real-time clock for shift/timestamp logging. The 24-bit sigma-delta AFE handles load-cell or pressure-transducer inputs via the on-chip PGA, eliminating a dedicated ADC chip; the 12-bit SAR scans up to 12 process channels (temperature, level, flow). The RTCC timestamps batches and alarms; the CTMU scans the front-panel capacitive keys; and the 132-pixel LCD shows weight, setpoint and alarm icons. nanoWatt modes reduce standby drain in loop-powered 4-20 mA instrumentation below 1 uA.
Được đề xuất
Capacitive-Touch User Interface with LCD
The PIC18F87J72-I/PT implements a full capacitive-touch HMI controller using only the on-chip CTMU module and a few scan resistors, with no external touch IC. The CTMU provides timing-controlled charge measurement on up to 32 electrodes, supporting multi-touch sliders and proximity wake-up; the 132-pixel LCD driver displays the menu and live status; the 2x USART interfaces to a host controller for telemetry. The integrated design reduces BOM and PCB area versus an MCU + external touch controller architecture, while the PIC18 core runs the touch-scan loop, debounce, and LCD refresh in 12 MIPS headroom.
Được đề xuất
Smart Home Energy Gateway Edge Node
In a Zigbee / Thread / Wi-Fi smart-home energy gateway, the PIC18F87J72-I/PT acts as the metrology edge node that samples circuit-level CT clamps, calculates per-channel energy, and reports to a host SoC over SPI or UART. The dual 24-bit AFE channels give better than 0.5% accuracy across 1 A to 50 A CT clamp ranges, while the 12-channel SAR ADC reads auxiliary sensors. nanoWatt sleep reduces idle current to <1 uA, allowing the gateway to remain on a coin cell during AC loss events. The hardware RTCC timestamps the last-successful-measurement for power-loss recovery, and the 132-pixel segment LCD on the breaker-panel shows per-circuit consumption and Wi-Fi status.
Được đề xuất
Tóm tắt các sản phẩm được đề xuất
Dữ liệu tham khảo kỹ thuật cho PIC18F87J72-I/PT — so sánh, hướng dẫn thiết kế và thông tin tuân thủ.
Hướng dẫn chọn lựa
So sánh với các sản phẩm thay thế
| Tham số | Sản phẩm này | PIC18F87J72T-I/PT | PIC18F87J72-E/PT | PIC18F86J72T-I/PT | PIC18F87J10-I/PT | PIC18F8723-I/PT |
|---|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 80-pin TQFP (PT), 12x12 mm | 80-pin TQFP (PT), 12x12 mm - same | 80-pin TQFP (PT), 12x12 mm - same | 80-pin TQFP (PT), 12x12 mm - same | 80-pin TQFP (PT), 12x12 mm - same | 80-pin TQFP (PT), 12x12 mm - same |
| Program Memory | 128 KB Flash | 128 KB Flash - identical | 128 KB Flash - identical | 64 KB Flash (-50%) | 128 KB Flash - identical | 128 KB Flash - identical |
| Sigma-Delta AFE | Dual 16/24-bit with PGA | Dual 16/24-bit with PGA - identical | Dual 16/24-bit with PGA - identical | Dual 16/24-bit with PGA - identical | Not present | Not present |
| SAR ADC | 12-bit, 12 channels | 12-bit, 12 channels - identical | 12-bit, 12 channels - identical | 12-bit, 12 channels - identical | 10-bit, 12 channels (-17%) | 12-bit, 16 channels |
| LCD Pixels | 132 | 132 - identical | 132 - identical | 96 (-27%) | Not present | Not present |
| CTMU | Yes | Yes - identical | Yes - identical | Yes - identical | Not present | Not present |
| Operating Temperature | -40 to +85 C (Industrial) | -40 to +85 C (Industrial) - identical | -40 to +125 C (Extended) | -40 to +85 C (Industrial) - identical | -40 to +85 C (Industrial) - identical | -40 to +85 C (Industrial) - identical |
| Max CPU Speed | 48 MHz / 12 MIPS | 48 MHz / 12 MIPS - identical | 48 MHz / 12 MIPS - identical | 48 MHz / 12 MIPS - identical | 40 MHz / 10 MIPS (-17%) | 40 MHz / 10 MIPS (-17%) |
Bảo phân biệt quan trọng
- Integrated dual 16/24-bit sigma-delta AFE with on-chip PGA (vsPIC18F8723-I/PT)
- Built-in 132-pixel LCD driver with charge pump (vsPIC18F87J10-I/PT)
- On-chip CTMU capacitive-touch module (vsPIC18F86J72T-I/PT)
- 128 KB Flash for full metering firmware with display and communication stacks (vsPIC18F86J72T-I/PT)
- Hardware RTCC with 32.768 kHz crystal domain (vsPIC18F8723-I/PT)
Ghi chú thiết kế
The PIC18F87J72-I/PT operates from 2.0 V to 3.6 V on VDD; connect a 100 nF decoupling capacitor at every VDD/VSS pair within 5 mm of the pin, plus a single 10 uF bulk capacitor at the regulator output. The integrated LCD charge pump requires the VLCD pin to be bypassed with 1 uF to ground and isolated from the analog VDD by a ferrite bead to avoid LCD ripple coupling into the AFE measurement. In battery-backed metering, route a separate 3 V coin cell through a schottky diode to maintain RTCC during AC loss without back-powering the metrology front end.
Place the current-transformer or shunt-sensor burden resistors within 10 mm of the dedicated AFE pins (RH0-RH3) and route the differential traces as a matched-impedance pair over a continuous ground plane. Avoid routing digital signals (SPI, I2C, USART) across the AFE region to minimize digital-to-analog crosstalk. The CTMU scan traces should be guarded by a ground ring tied to VSS at both ends, with 2 mm spacing to any high-voltage traces to prevent false touch triggers in noisy industrial environments.
Estimated: power dissipation at 48 MHz with all peripherals active is approximately 35 mW (VDD = 3.3 V, IDD = 10.5 mA typical). The 80-pin TQFP theta_JA is approximately 50 C/W on a 4-layer JEDEC test board, giving a junction-to-ambient rise of about 17 C at full load - derate to 1.7 mA/MHz maximum in enclosed meter enclosures. Do not exceed 3.6 V on any VDD pin; the AFE inputs are sensitive to VDD ripple - add a ferrite bead in series with the digital 3.3 V supply. The RTCC requires a 32.768 kHz crystal on the SOSCO/SOSCI pins for timekeeping; do not share this crystal with the main oscillator.
For IEC 62053-21 class-1 accuracy, the AFE PGA gain should be set no higher than 16x on current-channel inputs to avoid saturating the 24-bit sigma-delta modulator on inrush current. Apply a 1 kHz RC anti-aliasing filter (R = 1 kohm, C = 100 nF) on each AFE channel input to suppress switching-converter noise from the LCD charge pump. The 12-bit SAR ADC reference (VREF+/VREF-) must be bypassed with 100 nF plus 10 uF to AVSS to achieve 12-bit ENOB; routing AVSS as a separate island tied back to VSS at a single point prevents ground-loop errors in metrology calibration.
Thông tin tuân thủ
RoHS compliant per Microchip product page. Lead-free matte-tin finish. Not AEC-Q100 qualified - this part is designed for industrial / consumer metering, not automotive under-hood applications.
