PIC16LF1903T-I/SO - 8-bit 20MHz MCU 7KB Flash LCD XLP | Microchip
MPN: PIC16LF1903T-I/SO ✓ Hoạt độngPIC16LF1903T-I/SO Tóm tắt
A microcontroller (MCU) is a single-chip computer that integrates a CPU, memory, and peripherals. The PIC16LF1903 belongs to Microchip's enhanced mid-range 8-bit core family with 49 instructions and 16 stack levels, sitting within the broader hierarchy of embedded controllers from 8-bit PIC microcontrollers to 32-bit ARM Cortex-M devices. Its on-chip LCD driver, 11-channel 10-bit ADC, internal 16 MHz oscillator, brown-out reset, and integrated temperature indicator reduce external component count for human-interface and battery-powered designs.
Key features include 7 KB (4K x 14) Flash with self read/write, 128 B of non-volatile data storage, 72 LCD segment drive support, 25 mA source/sink I/O capability, an 8-bit timer (TMR0), a 16-bit timer (TMR1), and an extended watchdog timer (EWDT). The nanoWatt XLP technology reduces sleep current to support multi-year coin-cell battery operation in metering, remote sensors, and portable medical devices.
Typical applications span industrial LCD keypads, battery-backed thermostats, electronic shelf labels, low-cost consumer appliances, and automotive body controllers requiring automotive-grade temperature resilience. The wide 28-SOIC footprint and standard peripherals ease PCB layout reuse across PIC16F/LF product migrations.
When designing with this device, choose decoupling capacitors within 5 mm of VDD, leave the MCLR pin pulled high through a 10 kohm resistor for normal operation, and verify the in-circuit serial programming (ICSP) pins remain accessible for production-line firmware updates. Operating temperature is industrial -40 C to +85 C.
This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet, providing information gain beyond standard supplier listings.
Bộ thay thế dễ dàng lắp đặt cho PIC16LF1903T-I/SO — 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 PIC16LF1903T-I/SO (cùng hình factor và footprint) — khác nhau ở ADC, Package, I/O Pins, Maximum CPU Speed, Mounting Type.
PIC16LF1903-I/SO
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
PIC16LF1903T-I/SO Tỷ lệ tối đa & tính chất điện
| Core Architecture | PIC 8-bit enhanced mid-range |
| Program Memory (Flash) | 7 KB (4K x 14) |
| Data RAM | 256 B |
| Non-volatile Data EEPROM | 128 B (emulated) |
| Maximum CPU Speed | 20 MHz |
| Supply Voltage (VDD) | 2.5 V to 3.6 V |
| I/O Pins | 18 |
| LCD Segment Driver | Up to 72 segments |
| ADC | 11 channels, 10-bit |
| Timers | 1x 8-bit (TMR0), 1x 16-bit (TMR1), 1x EWDT |
| Internal Oscillator | 16 MHz |
| I/O Sink/Source Current | 25 mA |
| Nhiệt độ hoạt động | -40 C to +85 C (Industrial) |
| Hộp | 28-pin SOIC (SO), 7.50 mm wide body, gull-wing |
| Kiểu lắp đặt | Surface Mount, Tape & Reel |
| Low-Power Technology | nanoWatt XLP |
| Trạng thái RoHS | Compliant |
Cấu hình chân PIC16LF1903T-I/SO
| Chân 1 | RA2/AN2 — Port A bit 2 / Analog input 2 |
| Chân 2 | RA3/AN3/Vref+ — Port A bit 3 / Analog input 3 / Positive voltage reference |
| Chân 3 | RA4/AN4 — Port A bit 4 / Analog input 4 |
| Chân 4 | RA5/AN5 — Port A bit 5 / Analog input 5 |
| Chân 5 | VSS — Ground reference |
| Chân 6 | RA7/SEG17 — Port A bit 7 / LCD segment 17 |
| Chân 7 | RA6/SEG16 — Port A bit 6 / LCD segment 16 |
| Chân 8 | RC0 — Port C bit 0 |
| Chân 9 | RC1 — Port C bit 1 |
| Chân 10 | RC2 — Port C bit 2 |
| Chân 11 | RC3 — Port C bit 3 |
| Chân 12 | RC4 — Port C bit 4 |
| Chân 13 | RC5 — Port C bit 5 |
| Chân 14 | RC6 — Port C bit 6 |
| Chân 15 | RC7 — Port C bit 7 |
| Chân 16 | VSS — Ground reference |
| Chân 17 | VDD — Positive supply voltage |
| Chân 18 | RA1/AN1 — Port A bit 1 / Analog input 1 |
| Chân 19 | RA0/AN0 — Port A bit 0 / Analog input 0 |
| Chân 20 | MCLR/Vpp — Master clear reset / Programming voltage |
| Chân 21 | RB7/SEG15 — Port B bit 7 / LCD segment 15 |
| Chân 22 | RB6/SEG14 — Port B bit 6 / LCD segment 14 |
| Chân 23 | RB5/SEG13 — Port B bit 5 / LCD segment 13 |
| Chân 24 | RB4/SEG12 — Port B bit 4 / LCD segment 12 |
| Chân 25 | RB3/SEG11 — Port B bit 3 / LCD segment 11 |
| Chân 26 | RB2/SEG10 — Port B bit 2 / LCD segment 10 |
| Chân 27 | RB1/SEG9 — Port B bit 1 / LCD segment 9 |
| Chân 28 | RB0/SEG8/INT — Port B bit 0 / LCD segment 8 / External interrupt |
Ứng dụng tiêu biểu
PIC16LF1903T-I/SO phù hợp cho 6 Áp dụngs: Battery-Powered Thermostat, Electronic Shelf Label (ESL), Industrial LCD Keypad Module, Portable Medical Monitor, Automotive Body Control Module (BCM), Smart Home Sensor Node.
Battery-Powered Thermostat
The PIC16LF1903T-I/SO fits battery-powered thermostats because of its 2.5 V to 3.6 V supply that aligns directly with 2x AA alkaline cells, and its nanoWatt XLP sleep current in the sub-microampere range that delivers multi-year battery life. The integrated 72-segment LCD driver eliminates the need for an external LCD controller, lowering BOM cost on the user-interface display. The 11-channel 10-bit ADC reads temperature sensor and user-set dial inputs with sufficient resolution. Placed on the main PCB with the SOIC-28 footprint, the device offers 18 I/O lines for keypad scanning, relay control, and serial communication to a remote HVAC receiver. Unlike higher-pin-count PIC16F variants, the 28-SOIC footprint simplifies hand-soldering during prototype builds.
Được đề xuất
Electronic Shelf Label (ESL)
The PIC16LF1903T-I/SO suits electronic shelf labels because its nanoWatt XLP technology enables years of operation from coin-cell batteries, and its LCD segment driver directly addresses the segmented display without external ICs. The 18 I/O pins drive LCD segments, RF module handshaking, and battery monitoring. Operating at 20 MHz, the MCU handles display refresh, button input, and wireless link management. The 2.5 V to 3.6 V supply matches single-cell CR2032 or CR2450 lithium coin cells directly. The wide industrial temperature range -40 C to +85 C supports refrigerated and freezer retail aisles without condensation-induced drift. Compared with discrete logic alternatives, this single-chip solution reduces PCB area by 60-70 percent.
Được đề xuất
Industrial LCD Keypad Module
The PIC16LF1903T-I/SO is well matched to industrial LCD keypad modules because its hardware LCD controller supports 72 segments - enough to drive a 4x20 character LCD or graphical segmented display. The 256 B SRAM is adequate for menu state machines, while the 7 KB Flash stores keypad mapping, I/O handling, and Modbus or RS-485 protocol stacks. The 25 mA I/O sink/source capability drives relay coils or optocouplers directly without external drivers. According to the Microchip datasheet, the 8-bit TMR0 and 16-bit TMR1 provide sufficient timing resources for keypad debounce and serial bit-banging. Compared with a discrete 8051 solution, this single-chip PIC integrates analog, timers, and LCD into one 28-SOIC package.
Được đề xuất
Portable Medical Monitor
The PIC16LF1903T-I/SO fits portable medical monitoring devices because of its medical-relevant low-voltage operation and nanoWatt XLP sleep mode that supports extended battery life during patient transport. The 11-channel 10-bit ADC captures pulse oximeter, thermometer, and accelerometer sensor inputs. The integrated temperature indicator serves as a basic on-chip health check. The 256 B SRAM and 7 KB Flash are sufficient for sensor fusion and BLE link management. The wide industrial temperature range supports patient-use environments from chilled storage to body-temperature operating points. Unlike higher-end 32-bit MCUs, the PIC16LF1903 keeps system cost low for disposable or single-use medical accessories.
Được đề xuất
Automotive Body Control Module (BCM)
The PIC16LF1903T-I/SO supports automotive body control modules requiring -40 C to +85 C industrial temperature range, where the integrated ADC reads switch positions and the LCD driver displays fault codes on a small diagnostic display. The 25 mA I/O sink/source drives LED indicators and small relays without buffer transistors. The 18 I/O pins handle door lock switches, lighting controls, and CAN-bus message buffering. Source: Microchip specifies this device for industrial-grade applications where automotive temperature range is sufficient. Compared with AEC-Q100-qualified PIC16F variants, the LF1903 trades AEC-Q100 qualification for lower cost in non-safety automotive applications.
Được đề xuất
Smart Home Sensor Node
The PIC16LF1903T-I/SO is ideal for smart home sensor nodes where the nanoWatt XLP technology enables coin-cell operation for 3-5 years, and the integrated ADC reads environmental sensors like temperature, humidity, and motion PIR outputs. The 18 I/O pins drive status LEDs, pushbutton inputs, and a low-power RF module for Zigbee or LoRa communication. The 7 KB Flash fits application firmware plus over-the-air update bootloaders. According to the Microchip datasheet, the integrated 16 MHz oscillator eliminates external crystal cost on cost-sensitive IoT nodes. Unlike 32-bit Cortex-M alternatives, the 8-bit PIC keeps the BOM cost under $1 for high-volume IoT deployments.
Được đề xuất
Tóm tắt các sản phẩm được đề xuất
Dữ liệu tham khảo kỹ thuật cho PIC16LF1903T-I/SO — 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/SO |
|---|---|---|
| Package | 28-SOIC | 28-SOIC (tube packaging) |
| Brand | Microchip Technology | Microchip Technology |
| Program Memory | 7 KB Flash | 7 KB Flash (identical) |
| RAM | 256 B | 256 B (identical) |
| Supply Voltage | 2.5 V to 3.6 V | 2.5 V to 3.6 V (identical) |
| CPU Speed | 20 MHz | 20 MHz (identical) |
| I/O Pins | 18 | 18 (identical) |
| LCD Segments | Up to 72 | Up to 72 (identical) |
| ADC | 11 x 10-bit | 11 x 10-bit (identical) |
| Operating Temperature | -40 C to +85 C | -40 C to +85 C (identical) |
Bảo phân biệt quan trọng
- Identical silicon in tube packaging format (vsPIC16LF1903-I/SO)
- Integrated 72-segment LCD driver (vsPIC16F18855-I/SO)
- Low-voltage 2.5 V to 3.6 V operation (vsPIC16F1903-I/SO)
Ghi chú thiết kế
Place a 100 nF ceramic decoupling capacitor within 5 mm of the VDD pin (pin 17) and a 10 uF bulk capacitor on the main supply rail. The PIC16LF1903's nanoWatt XLP sleep current is sub-microampere, but transient load steps during ADC conversion can draw several milliamps. According to the Microchip datasheet, a poorly decoupled supply can cause ADC noise and brown-out reset events. Use a low-ESR ceramic for the bulk capacitor for best transient response.
Route the ICSPDAT and ICSPCLK signals (typically shared with RB7 and RB6) away from high-frequency noise sources and keep them short for reliable in-circuit serial programming. The MCLR pin (pin 20) requires a 10 kohm pull-up resistor to VDD for normal operation; do not leave it floating. Estimated: the 10 kohm pull-up value is a Microchip datasheet recommendation and not derived from the present calculation.
Do not exceed the absolute maximum VDD of 3.6 V - applying 5 V from a USB or unregulated supply will permanently damage the LF variant. The 'LF' prefix denotes low-voltage operation; the PIC16F1903 is required for 5 V tolerance. According to the Microchip datasheet, the brown-out reset (BOR) is enabled by default but should be verified in the configuration words. Forgetting to set the configuration bits is a common firmware pitfall that locks the device into an unprogrammed state.
The PIC16LF1903T-I/SO in industrial temperature range supports -40 C to +85 C ambient operation. At maximum 20 MHz CPU speed with all peripherals active, the device draws approximately 5-7 mA from VDD. Estimated: with VDD = 3.3 V, power dissipation is roughly 20 mW, well within the SOIC-28 package's thermal capability. For continuous high-temperature operation above 70 C ambient, ensure adequate PCB copper pour for heat spreading.
Thông tin tuân thủ
RoHS compliant per Microchip product page; lead-free SOIC-28 package. Not AEC-Q100 qualified - select automotive-grade PIC16F variants for AEC-Q100 applications. Halogen-free status not explicitly stated in verified data.
