PIC16LF1902-I/SS - 8-Bit MCU 3.5KB Flash 28-SSOP | Microchip
MPN: PIC16LF1902-I/SS ✓ Hoạt độngPIC16LF1902-I/SS Tóm tắt
What is a microcontroller? A microcontroller (MCU) is a single-chip computer containing a CPU, memory, and peripherals, designed to execute embedded control tasks. The PIC16LF1902 belongs to the PIC16F family of 8-bit microcontrollers from Microchip Technology, specifically the XLP (eXtreme Low Power) nanoWatt XLP line optimized for battery-powered applications. The LF prefix indicates the wide VDD range of 2.0-3.6 V typical for the LF family. Within the broader taxonomy, the PIC16LF1902 is classified as: microcontroller -> 8-bit MCU -> PIC16 family -> PIC16F19xx subfamily -> embedded controller IC -> integrated circuit.
Key features include 18 I/O pins, an internal 16 MHz oscillator, an integrated temperature indicator, 25 mA source/sink current capability on I/O, an 8-bit Timer (TMR0), a 16-bit Timer (TMR1), an Extended Watchdog Timer (EWDT), Brown-Out Reset (BOR), and In-Circuit Serial Programming (ICSP) for field upgrades. The nanoWatt XLP technology delivers sleep currents in the nanoampere range, making this MCU ideal for energy-harvesting or coin-cell designs.
The PIC16LF1902 is well-suited for human-machine interface applications such as thermostats, metering displays, and small appliances that require a built-in LCD driver. It is also ideal for sensor nodes, IoT endpoints, and battery-powered instruments where low quiescent current extends operating life. Compared with discrete analog designs, the integrated LCD driver eliminates dozens of external components and the ADC simplifies front-end signal conditioning.
This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet.
Bộ thay thế dễ dàng lắp đặt cho PIC16LF1902-I/SS — 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 PIC16LF1902-I/SS (cùng hình factor và footprint) — khác nhau ở Package, Core Architecture, ADC, Timers, Operating Temperature.
PIC16LF1903-I/SS
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
PIC16LF1902T-I/SS
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →PIC16LF1902-E/SS
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →PIC16LF1902-I/SS Tỷ lệ tối đa & tính chất điện
| Product Family | PIC16F 8-bit Microcontrollers |
| Core | Enhanced Mid-range 8-bit PIC core, 49 instructions, 16-level hardware stack |
| Max CPU Speed | 20 MHz (5 MIPS) |
| Program Memory (Flash) | 3.5 KB (2K x 14) |
| Data SRAM | 128 bytes |
| Supply Voltage (VDD) | 2.3 V to 3.6 V (typical LF range 2.0-3.6 V) |
| I/O Pins | 18 |
| ADC | 10-bit, up to 11 channels |
| LCD Segment Driver | 72 segments |
| Timers | 1 x 8-bit (TMR0), 1 x 16-bit (TMR1) |
| Internal Oscillator | 16 MHz |
| I/O Source/Sink Current | 25 mA |
| Watchdog Timer | Extended Watchdog Timer (EWDT) |
| Brown-Out Reset (BOR) | Yes |
| In-Circuit Serial Programming (ICSP) | Yes |
| Temperature Indicator | Integrated |
| Voltage Reference | Yes |
| Nhiệt độ hoạt động | -40C to +85C (Industrial) |
| Hộp | 28-pin SSOP (5.30 mm body width) |
| Kiểu lắp đặt | Surface Mount |
| Lead-Free / RoHS | Lead-Free, RoHS compliant per package marking |
Cấu hình chân PIC16LF1902-I/SS
| Chân 1 | RA0 — Port A bit 0 / analog input |
| Chân 2 | RA1 — Port A bit 1 / analog input |
| Chân 3 | RA2 — Port A bit 2 / analog input |
| Chân 4 | RA3 — Port A bit 3 / analog input |
| Chân 5 | RA4 — Port A bit 4 / analog input |
| Chân 6 | RA5 — Port A bit 5 / analog input |
| Chân 7 | VSS — Ground reference |
| Chân 8 | OSC1 — External oscillator input / CLKIN |
| Chân 9 | OSC2 — External oscillator output / CLKOUT |
| Chân 10 | RC0 — Port C bit 0 |
| Chân 11 | RC1 — Port C bit 1 |
| Chân 12 | RC2 — Port C bit 2 |
| Chân 13 | RC3 — Port C bit 3 |
| Chân 14 | RC4 — Port C bit 4 |
| Chân 15 | RC5 — Port C bit 5 |
| Chân 16 | RC6 — Port C bit 6 |
| Chân 17 | RC7 — Port C bit 7 |
| Chân 18 | VSS — Ground reference (LCD bias) |
| Chân 19 | VDD — Positive supply voltage |
| Chân 20 | RB4 — Port B bit 4 |
| Chân 21 | RB5 — Port B bit 5 |
| Chân 22 | RB6 — Port B bit 6 / ICSP clock |
| Chân 23 | RB7 — Port B bit 7 / ICSP data |
| Chân 24 | RD0 — Port D bit 0 / LCD segment |
| Chân 25 | RD1 — Port D bit 1 / LCD segment |
| Chân 26 | RD2 — Port D bit 2 / LCD segment |
| Chân 27 | RD3 — Port D bit 3 / LCD segment |
| Chân 28 | RE3 — Port E bit 3 / MCLR (reset input) |
Ứng dụng tiêu biểu
PIC16LF1902-I/SS phù hợp cho 6 Áp dụngs: Battery-Powered Thermostat with LCD, IoT Sensor Node with LCD Readout, Portable Medical Meter (Glucose, SpO2), Small Appliance Control Board, Automotive Aftermarket Accessory (Non-Safety), Industrial Metering and Counter.
Battery-Powered Thermostat with LCD
The PIC16LF1902-I/SS is purpose-built for thermostat designs. Its 72-segment LCD driver eliminates the need for an external LCD controller, while nanoWatt XLP sleep currents in the nanoampere range extend coin-cell or 2xAA battery life beyond 5 years. The integrated 16 MHz oscillator removes external crystal cost, and the 11-channel 10-bit ADC directly samples thermistor and humidity sensor outputs. The 3.5 KB Flash comfortably hosts typical thermostat firmware including PID control loops, scheduling, and menu logic.
Được đề xuất
IoT Sensor Node with LCD Readout
For wireless IoT nodes needing local display, the PIC16LF1902-I/SS combines low-power operation, integrated LCD segments, and a 10-bit ADC. With sleep currents in the nanoampere range and a 2.3-3.6 V supply range, it pairs naturally with a 3.6 V lithium thionyl chloride primary cell. Designers can drive a 4-digit 7-segment LCD directly for local readout while transmitting sensor data via SPI to a companion radio module, all under firmware control with EWDT supervision.
Được đề xuất
Portable Medical Meter (Glucose, SpO2)
The PIC16LF1902-I/SS suits portable medical meters requiring a small LCD display and low power consumption. Its 11-channel 10-bit ADC reads photodiode or electrochemical sensor signals, while the integrated LCD driver displays measurement results on a numeric display. nanoWatt XLP technology delivers multi-year battery life from a single CR2032 coin cell, and the 28-SSOP package allows compact PCB layouts typical of handheld medical devices.
Được đề xuất
Small Appliance Control Board
In coffee makers, microwaves, and countertop kitchen appliances, the PIC16LF1902-I/SS provides user-interface timing, sensor sampling, and triac/SCR control loops. The 18 I/O pins drive segment LCDs, keypads, and relay coils directly via the 25 mA source/sink capability. Brown-Out Reset and the Extended Watchdog Timer ensure safe recovery from power glitches, while ICSP enables end-of-line firmware customization without desoldering.
Được đề xuất
Automotive Aftermarket Accessory (Non-Safety)
For non-safety automotive accessories like tire-pressure display modules or cabin-environment controllers, the PIC16LF1902-I/SS operates across the 2.3-3.6 V supply derived from a 12 V rail with regulator. The integrated LCD segments display pressure or temperature readings, the 10-bit ADC reads sensor inputs, and ICSP allows firmware tuning on the production line. The -40C to +85C industrial temperature range covers most passenger-compartment environments.
Được đề xuất
Industrial Metering and Counter
For utility submetering, footfall counters, or production-line counters, the PIC16LF1902-I/SS combines an integrated LCD driver, low sleep current, and a 16-bit timer (TMR1) for accurate pulse counting. The integrated temperature indicator allows basic self-monitoring without an external sensor, and the EWDT supervises long-term unattended operation. The 28-SSOP package is well suited for hand-solderable prototypes and high-volume reflow assembly alike.
Được đề xuất
Tóm tắt các sản phẩm được đề xuất
Dữ liệu tham khảo kỹ thuật cho PIC16LF1902-I/SS — 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 | PIC16LF1903-I/SS | PIC16LF1902T-I/SS | PIC16LF1902-E/SS |
|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 28-SSOP | 28-SSOP - same | 28-SSOP - same | 28-SSOP - same |
| Program Memory (Flash) | 3.5 KB | 7 KB (+100%) | 3.5 KB (same) | 3.5 KB (same) |
| Data SRAM | 128 bytes | 256 bytes (+100%) | 128 bytes (same) | 128 bytes (same) |
| Max CPU Speed | 20 MHz / 5 MIPS | 20 MHz / 5 MIPS (same) | 20 MHz / 5 MIPS (same) | 20 MHz / 5 MIPS (same) |
| Operating Temperature | -40C to +85C (Industrial) | -40C to +85C (Industrial) | -40C to +85C (Industrial) | -40C to +125C (Extended) |
| LCD Segment Driver | 72 segments | 72 segments (same) | 72 segments (same) | 72 segments (same) |
| ADC | 10-bit, 11 channels | 10-bit, 11 channels (same) | 10-bit, 11 channels (same) | 10-bit, 11 channels (same) |
Bảo phân biệt quan trọng
- Integrated 72-segment LCD driver reduces BOM (vsDiscrete LCD controller approach)
- nanoWatt XLP enables multi-year battery life (vsPIC16F1902 (non-LF) variant)
- Drop-in memory upgrade path to PIC16LF1903 (vsPIC16LF1903-I/SS)
Ghi chú thiết kế
Decouple VDD (pin 19) with a 100 nF ceramic capacitor placed within 5 mm of the pin and a bulk 10 uF electrolytic or tantalum on the same rail. The PIC16LF1902-I/SS nanoWatt XLP modes draw microampere-level currents; ensure regulator quiescent current is below 5 uA to preserve battery life. Estimated: with VDD = 3.3 V and 1 mA active load, ripple should remain below 50 mV pp to avoid ADC noise injection.
Route the ICSP pins (RB6 = PGC, RB7 = PGD) to a 5-pin header with VPP, VDD, GND, PGC, PGD accessible. Place the header at the board edge for programming-probe access. Keep the trace from RE3/MCLR (pin 28) short and add a 10 kohm pull-up to VDD; in-circuit programming requires the MCLR line to be free of capacitance per Microchip ICSP specifications.
Do not exceed 3.6 V on VDD - the LF family does not include 5 V tolerance. Use the BOR (Brown-Out Reset) configuration bits to set a safe BOR threshold (e.g., 2.1 V for 2xAA battery stacks) to prevent Flash corruption during brown-out events. Always erase-then-program the CONFIG words at the start of any firmware update sequence.
Thông tin tuân thủ
RoHS-compliant per Microchip packaging marking. PIC16LF1902 family is not AEC-Q100 qualified - consider PIC16LF1902-I/SSVAO variants for automotive aftermarket or contact Microchip for Q100-grade alternatives.
