PIC16LF1902T-I/ML - 3.5KB Flash 8-Bit MCU w/ LCD | Microchip
MPN： PIC16LF1902T-I/ML ✓ 啟用中PIC16LF1902T-I/ML 概覽
A PIC microcontroller (Programmable Integrated Circuit) is a compact 8-bit RISC processor family originally developed by General Instrument's Microelectronics Division and popularized by Microchip. PIC MCUs combine a Harvard-architecture CPU core with on-chip Flash, RAM, and peripherals (ADC, timers, PWM, communication interfaces) into a single IC, positioning them above simple digital logic but below 32-bit microprocessors in the embedded computing hierarchy. PIC16F1xxx-family devices specifically belong to the enhanced mid-range core family with 49 instructions, 16-level hardware stack, and self read/write Flash capability.
Key features include a 20 MHz maximum operating frequency (16 MIPS performance at 4 clock cycles per instruction), wide 1.8V to 3.6V operating voltage window for battery-powered designs, integrated temperature indicator, brown-out reset (BOR), extended watchdog timer (EWDT), in-circuit serial programming (ICSP), and an enhanced 8-bit timer (TMR0) plus 16-bit timer (TMR1). The on-chip LCD driver supports up to 72 segments, eliminating the need for an external LCD controller in many HMI applications.
Architecturally, the PIC16LF1902T-I/ML uses an 8-bit data path with separate program and data buses, an interrupt controller with hardware context saving, and nanoWatt XLP power management that drops quiescent current into the microamp range during sleep. The peripheral pin select (PPS) feature enables flexible pin assignment for digital functions, while the 10-bit ADC with internal voltage reference supports ratiometric measurements on battery or sensor channels.
Typical applications include battery-powered LCD-based consumer products (thermostats, remote controls, weighing scales, kitchen timers), portable medical devices requiring low-power LCD HMI, industrial sensor transmitters with LCD readout, smart home keypads, and any cost-sensitive embedded design needing integrated LCD without an external driver IC. The wide 1.8V-3.6V range supports direct connection to two AA alkaline cells or single-cell Li-Ion chemistries.
When designing with this device, note that the VQFN-28 (ML) package requires a ground plane via the exposed thermal pad for both thermal dissipation and electrical grounding; neglecting this pad is a common cause of MCU malfunction. Also confirm oscillator selection and PPS locking during bring-up, since the internal 16 MHz HFINTOSC and PLL configurations differ from older PIC16F parts.
直接替換替代品，適用於 PIC16LF1902T-I/ML — 相同封裝，腳位對腳位相容。需重新設計 PCB 的不同封裝零件不列入。
此系列的變體
與下列產品可直接替換的同系列型號： PIC16LF1902T-I/ML （相同外形與佔位） — 差異在於 ADC, Package, Timers, Core Architecture, Operating Temperature.
PIC16LF1903T-I/ML
✅ 直接替換聯絡詢價
查看資料表 →PIC16LF1902-I/ML
✅ 直接替換聯絡詢價
查看資料表 →PIC16LF1902T-I/MV
✅ 直接替換聯絡詢價
查看資料表 →PIC16LF1902T-I/SO
✅ 直接替換聯絡詢價
查看資料表 →PIC16LF1902T-I/SP
✅ 直接替換📋 參考替代品（不在目錄中）
PIC16LF1902T-I/ML 最大額定值與電氣特性
| Product Family | PIC16F1xxx enhanced mid-range |
| Series | PIC16LF1902 |
| Core | 8-bit PIC RISC (enhanced mid-range, 49 instructions) |
| Program Memory (Flash) | 3.5 KB (2K x 14) |
| RAM | 128 bytes |
| 資料匯流排寬度 | 8 bit |
| 最大時脈頻率 | 20 MHz |
| 工作電源電壓 | 1.8 V to 3.6 V |
| I/O Pins | 25 |
| ADC | 11 channels x 10 bit, with internal voltage reference |
| LCD Driver | Up to 72 segments, integrated charge pump option |
| Timers | TMR0 (8-bit), TMR1 (16-bit), plus EWDT |
| Internal Oscillator | 16 MHz HFINTOSC + 31 kHz LFINTOSC |
| Program Memory Type | Flash, self read/write capable |
| Brown-out Reset (BOR) | Yes |
| In-Circuit Serial Programming (ICSP) | Yes |
| 工作溫度 | -40 C to +85 C (Industrial) |
| 封裝 | VQFN-28 (4x4 mm) with exposed thermal pad |
| 安裝類型 | Surface Mount |
| RoHS 狀態 | Compliant |
PIC16LF1902T-I/ML 腳位配置
| 腳位 1 | RA5 — GPIO / segment drive / analog input |
| 腳位 2 | RA4 — GPIO / segment drive / analog input |
| 腳位 3 | RA3 — GPIO / segment drive / analog input |
| 腳位 4 | RC5 — GPIO / segment drive |
| 腳位 5 | RC4 — GPIO / segment drive |
| 腳位 6 | RC3 — GPIO / segment drive / SCL |
| 腳位 7 | RC2 — GPIO / segment drive / SDA |
| 腳位 8 | RC1 — GPIO / segment drive |
| 腳位 9 | RC0 — GPIO / segment drive |
| 腳位 10 | VSS — Ground |
| 腳位 11 | VDD — Positive supply (1.8 V to 3.6 V) |
| 腳位 12 | RA2 — GPIO / segment drive / analog input |
| 腳位 13 | RA1 — GPIO / segment drive / ICSPCLK |
| 腳位 14 | RA0 — GPIO / segment drive / ICSPDAT |
| 腳位 15 | RB7 — GPIO / segment drive |
| 腳位 16 | RB6 — GPIO / segment drive / ICD PGC |
| 腳位 17 | RB5 — GPIO / segment drive |
| 腳位 18 | RB4 — GPIO / segment drive / ICD PGD |
| 腳位 19 | RB3 — GPIO / segment drive |
| 腳位 20 | RB2 — GPIO / segment drive |
| 腳位 21 | RB1 — GPIO / segment drive |
| 腳位 22 | RB0 — GPIO / segment drive / interrupt-on-change |
| 腳位 23 | RC7 — GPIO / segment drive / RX |
| 腳位 24 | RC6 — GPIO / segment drive / TX |
| 腳位 25 | RA7 — GPIO / segment drive / oscillator |
| 腳位 26 | RA6 — GPIO / segment drive / oscillator |
| 腳位 27 | RE3 — GPIO / MCLR (reset, active-low) |
| 腳位 28 | VDD — Positive supply (tied to pin 11 for bypass) |
典型應用
PIC16LF1902T-I/ML 適用於 6 應用s: Battery-Powered LCD Thermostat, Kitchen Timer / Weighing Scale with LCD, Portable Medical Monitoring Device, Industrial Sensor Transmitter with LCD, Smart Home Keypad / HMI Controller, Remote Control with LCD Status Display.
Battery-Powered LCD Thermostat
The PIC16LF1902T-I/ML's integrated 72-segment LCD driver eliminates the need for an external LCD controller IC, reducing BOM cost and PCB footprint in wall-mount thermostats. The on-chip 11-channel 10-bit ADC with internal voltage reference reads NTC thermistors directly, while nanoWatt XLP technology keeps quiescent current in the microamp range during sleep for multi-year battery life on two AA cells. The 1.8-3.6 V supply range supports direct alkaline battery operation, and the VQFN-28 (4x4 mm) package fits behind standard LCD glass.
推薦
Kitchen Timer / Weighing Scale with LCD
Consumer kitchen appliances such as digital timers and weighing scales require an integrated LCD readout and battery-friendly operation. The PIC16LF1902T-I/ML combines a 10-bit ADC for load-cell signal conditioning, the 72-segment LCD driver for direct segment display, and nanoWatt XLP for under-1uA sleep current. The 3.5 KB Flash accommodates user-interface state machines and unit conversion tables, while the 20 MHz / 5 MIPS performance handles button-debounce and tare-weight math in real time without external logic.
推薦
Portable Medical Monitoring Device
Portable medical devices like glucose meters and pulse oximeters demand low-power LCD HMI and accurate sensor readout. The PIC16LF1902T-I/ML's nanoWatt XLP technology extends battery life in handheld monitors, while the 10-bit ADC reads sensor signals directly. The 1.8-3.6 V supply range supports single-cell Li-Po operation, and the industrial -40 to +85 C temperature rating covers home and clinical environments. The 72-segment LCD driver displays readings without external controller ICs.
推薦
Industrial Sensor Transmitter with LCD
Loop-powered and battery-powered industrial sensor transmitters benefit from the PIC16LF1902T-I/ML's integrated 10-bit ADC, integrated LCD readout, and nanoWatt XLP sleep currents. The 1.8-3.6 V range accepts 3.6 V lithium primary cells directly, while the 72-segment driver displays process variables in 4-20 mA loops or wireless sensor nodes. The extended -40 to +85 C industrial temperature rating supports factory-floor deployment, and the 3.5 KB Flash stores calibration coefficients and Modbus/RTU protocol stacks.
推薦
Smart Home Keypad / HMI Controller
Smart-home keypads, alarm panels, and HVAC controllers use the PIC16LF1902T-I/ML as a low-power HMI brain. The 25 I/O pins drive key matrices, LED indicators, and LCD segments simultaneously. The 11-channel ADC reads potentiometers, light sensors, and temperature inputs, while nanoWatt XLP keeps idle power minimal. The integrated LCD driver supports 72 segments, sufficient for menu navigation, setpoint display, and status icons without an external COG controller.
推薦
Remote Control with LCD Status Display
Universal remote controls and HVAC remote handsets benefit from the PIC16LF1902T-I/ML's integrated LCD for displaying setpoint, mode, and battery status without external controller ICs. The 1.8-3.6 V supply range supports direct 2xAA or single-cell Li-Po operation, and nanoWatt XLP technology keeps average current in the low microamp range during standby. The 3.5 KB Flash stores IR protocol libraries (NEC, RC5, SIRC), and 20 MHz / 5 MIPS performance drives carrier generation and button-debounce in real time.
推薦
推薦產品摘要
工程參考資料，適用於 PIC16LF1902T-I/ML — 比較、設計指引及合規資訊。
選型指南
與替代品比較
| 參數 | 本產品 | PIC16LF1903T-I/ML | PIC16LF1902-I/ML | PIC16LF1902T-I/MV | PIC16LF1902T-I/SO | PIC16LF1902T-I/SP |
|---|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | VQFN-28 (4x4 mm) | VQFN-28 (4x4 mm) | VQFN-28 (4x4 mm) | UQFN-28 (4x4 mm) | SOIC-28 (300 mil) | SPDIP-28 (300 mil) |
| Flash Program Memory | 3.5 KB (2K x 14) | 7 KB (4K x 14) | 3.5 KB (2K x 14) | 3.5 KB (2K x 14) | 3.5 KB (2K x 14) | 3.5 KB (2K x 14) |
| RAM | 128 bytes | 256 bytes | 128 bytes | 128 bytes | 128 bytes | 128 bytes |
| Operating Voltage | 1.8 V to 3.6 V | 1.8 V to 3.6 V | 1.8 V to 3.6 V | 1.8 V to 3.6 V | 1.8 V to 3.6 V | 1.8 V to 3.6 V |
| Maximum Clock Frequency | 20 MHz | 20 MHz | 20 MHz | 20 MHz | 20 MHz | 20 MHz |
| ADC | 11 ch x 10-bit | 11 ch x 10-bit | 11 ch x 10-bit | 11 ch x 10-bit | 11 ch x 10-bit | 11 ch x 10-bit |
| LCD Segments | Up to 72 | Up to 72 | Up to 72 | Up to 72 | Up to 72 | Up to 72 |
| Packaging Carrier | Tape & Reel (T suffix) | Tape & Reel | Tray (non-T) | Tape & Reel | Tape & Reel | Tape & Reel |
主要差異化特點
- Drop-in VQFN-28 upgrade path with 2x memory (對比PIC16LF1903T-I/ML)
- Tray-packaged identical-die alternative (對比PIC16LF1902-I/ML)
- Thinner UQFN variant for space-constrained designs (對比PIC16LF1902T-I/MV)
設計說明
The VQFN-28 (ML) package has an exposed thermal pad on the underside that MUST be soldered to a PCB ground plane. This pad serves as both the primary thermal dissipation path (carrying the chip's heat into the inner copper layers) and as the main VSS return. A typical recommended landing pattern uses an array of 3x3 thermal vias (0.3 mm drill / 0.6 mm pad) connecting the EP to the inner ground plane. Skipping the EP solder connection is one of the most common causes of erratic MCU behavior on first prototypes.
Place a 100 nF ceramic decoupling capacitor as close as possible to the VDD pin (pin 11), with a 10 uF bulk capacitor on the same supply rail. The PIC16LF1902T-I/ML's internal 16 MHz HFINTOSC starts up in tens of microseconds, but a clean VDD ramp is required for correct oscillator trimming register loading. Add a 10 kohm pull-up on MCLR (pin 27 / RE3) unless a manual reset pushbutton is wired in series - leaving MCLR floating may cause spurious resets in noisy environments.
When migrating from older PIC16F parts, remember that the PIC16F1xxx enhanced mid-range core uses different Configuration Word bits and oscillator configuration registers. The internal 16 MHz HFINTOSC must be selected via the OSCCON register, not by leaving CONFIG1 untouched. Additionally, the Peripheral Pin Select (PPS) feature locks by default - failing to unlock PPS before remapping U1TX or CCP1 results in 'pin does nothing' behavior that looks like a hardware fault but is actually a configuration issue.
The integrated LCD driver uses internal charge pump bias generation, but for 72-segment displays with high multiplex duty cycles, add 1 uF ceramic bypass capacitors on each VLCD pin (typically VLCD1, VLCD2, VLCD3) as close as possible to the package. Long LCD segment traces should be routed away from high-frequency switching nodes (PWM, oscillator) to prevent coupled noise from corrupting the LCD waveform, which appears as flickering or ghost segments.
合規資訊
RoHS compliant and Pb-free per Microchip product page. Not AEC-Q100 qualified - the PIC16LF1902T-I/ML is intended for industrial / consumer applications, not automotive. For automotive-grade equivalents consult Microchip's eXtreme Low Power (XLP) automotive MCU families.
