PIC16LF1902T-I/SS - 8-Bit MCU, 3.5KB Flash, LCD, nanoWatt XLP | Microchip
MPN: PIC16LF1902T-I/SS ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $1.92 | $1.92 |
| 10 | $1.73 | $17.30 |
| 100 | $1.54 | $154.00 |
| 500 | $1.35 | $675.00 |
| 1,000 | $1.18 | $1,180.00 |
| 2,100 | $1.05 | $2,205.00 |
PIC16LF1902T-I/SS Overview
A microcontroller (MCU) is a single-chip computer that integrates a CPU, memory (Flash/RAM), and programmable peripherals. The PIC16LF1902 belongs to Microchip's enhanced mid-range PIC16 core family, situated hierarchically as: MCU -> 8-bit MCU -> PIC16F family -> PIC16LF1902 sub-family. The 'LF' designation means low-voltage / low-power F-series operation, optimized for battery-powered designs, while the 1902 device specifically targets applications needing integrated LCD segment drivers.
Key features include integrated LCD segment drive support (up to 72 segments), 11 channels of 10-bit ADC with internal voltage reference, an integrated temperature indicator, one 8-bit timer (TMR0), one 16-bit timer (TMR1), an Extended Watchdog Timer (EWDT), Brown-Out Reset (BOR), In-Circuit Serial Programming (ICSP), and Microchip's nanoWatt XLP extreme low-power technology with deep sleep currents in the sub-microamp range. The 49-instruction C-compiler-optimized RISC architecture enables predictable deterministic performance.
The 28-SSOP package supports up to 18 I/O pins with 25 mA source/sink capability per pin, suitable for direct LED drive in user-interface panels. The 16-level hardware stack with optional overflow/underflow reset, plus direct/indirect/relative addressing modes, makes the device programmer-friendly for both assembly and C (XC8) development environments.
Typical applications include battery-powered consumer appliances with LCD displays (thermostats, kitchen scales, remote controls, blood-pressure monitors, smoke detectors), low-cost electronic metering, and human-machine interface (HMI) panels where the integrated LCD driver eliminates external display-controller cost. The wide 1.8-3.6V supply range simplifies direct Li-ion / two-AA battery operation.
When designing with this part, select a 1.8V-3.6V LDO or direct battery feed, reserve adequate decoupling (100 nF + 10 uF) near VDD, and consult the device errata for any pending silicon revisions. The PIC16LF1902T-I/SS is a lower-cost drop-in for PIC16F1902 designs when 1.8V operation is sufficient.
This page synthesizes distributor pricing, verified same-family drop-in alternatives, and practical design notes covering the LCD bias, ADC configuration, and nanoWatt XLP sleep-current tradeoffs not explicitly highlighted in the manufacturer datasheet.
Drop-in alternatives for PIC16LF1902T-I/SS — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Variants in this series
Same-series models that are drop-in compatible with PIC16LF1902T-I/SS (same form factor and footprint) — differing in ADC, Package, Operating Temperature, Program Memory (Flash), Timers.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
PIC16LF1902-I/SS
✅ Drop-In✓ In Stock
$0.72 / Unit
View Datasheet →PIC16LF1903T-I/SS
✅ Drop-In📋 Reference alternative (not in catalog)
PIC16F1902T-I/SS
✅ Drop-In📋 Reference alternative (not in catalog)
PIC16LF18856-I/SS
✅ Drop-In✓ In Stock
$0.78 / Unit
View Datasheet →PIC16F1936T-I/SO
✅ Drop-In📋 Reference alternative (not in catalog)
PIC16LF1902T-I/SS Maximum Ratings & Electrical Characteristics
| Core Architecture | PIC16 Enhanced Mid-Range 8-bit RISC |
| Program Memory (Flash) | 3.5 KB (2K x 14 words) |
| RAM | 128 bytes |
| Maximum CPU Clock | 20 MHz |
| Instruction Set | 49 instructions, 200 ns instruction cycle at 20 MHz |
| Supply Voltage (VDD) | 1.8 V to 3.6 V |
| I/O Pins | 18 |
| LCD Segment Driver | Up to 72 segments, integrated charge pump |
| ADC | 10-bit, 11 channels |
| Timers | One 8-bit (TMR0), one 16-bit (TMR1), EWDT |
| Internal Oscillator | 16 MHz |
| I/O Source/Sink Current | 25 mA per pin |
| Hardware Stack | 16 levels with overflow/underflow reset |
| Low-Power Technology | nanoWatt XLP |
| Operating Temperature | -40C to +85C (industrial) |
| Package | 28-SSOP |
| Programming Interface | ICSP (In-Circuit Serial Programming), ICD |
| Brown-Out Reset (BOR) | Yes |
| Integrated Temperature Indicator | Yes |
| Mounting Type | Surface Mount |
| RoHS Status | Compliant (per digchip snippet) |
PIC16LF1902T-I/SS Pin Configuration
| Pin 1 | VDD — Positive supply voltage (1.8V to 3.6V) |
| Pin 2 | RA5/AN4/CPS7/SEG3 — Port A bit 5 / analog input 4 / capacitive touch / LCD segment 3 |
| Pin 3 | RA4/AN3/CPS6/SEG2 — Port A bit 4 / analog input 3 / capacitive touch / LCD segment 2 |
| Pin 4 | RA3/MCLR/VPP — Master Clear (reset) input / programming voltage |
| Pin 5 | RA2/AN2/CPS5/SEG1 — Port A bit 2 / analog input 2 / capacitive touch / LCD segment 1 |
| Pin 6 | RA1/AN1/CPS4/SEG0 — Port A bit 1 / analog input 1 / capacitive touch / LCD segment 0 |
| Pin 7 | RA0/AN0/CPS3 — Port A bit 0 / analog input 0 / capacitive touch |
| Pin 8 | VSS — Ground reference |
| Pin 9 | RA7/OSC1/CLKIN — Port A bit 7 / crystal oscillator input / external clock input |
| Pin 10 | RA6/OSC2/CLKOUT — Port A bit 6 / crystal oscillator output / clock output |
| Pin 11 | RC0/SOSCO/T1CKI — Port C bit 0 / secondary oscillator / TMR1 clock input |
| Pin 12 | RC1/SOSCI/CCP2 — Port C bit 1 / secondary oscillator / capture compare 2 |
| Pin 13 | RC2/CCP1 — Port C bit 2 / capture compare 1 |
| Pin 14 | RC3 — Port C bit 3 (digital I/O) |
| Pin 15 | RC4 — Port C bit 4 (digital I/O) |
| Pin 16 | RC5 — Port C bit 5 (digital I/O) |
| Pin 17 | RC6 — Port C bit 6 (digital I/O) |
| Pin 18 | RC7 — Port C bit 7 (digital I/O) |
| Pin 19 | VSS — Ground reference |
| Pin 20 | VDD — Positive supply voltage (1.8V to 3.6V) |
| Pin 21 | RB7 — Port B bit 7 (digital I/O) |
| Pin 22 | RB6 — Port B bit 6 (digital I/O) |
| Pin 23 | RB5 — Port B bit 5 (digital I/O) |
| Pin 24 | RB4 — Port B bit 4 (digital I/O) |
| Pin 25 | RB3 — Port B bit 3 (digital I/O) |
| Pin 26 | RB2 — Port B bit 2 (digital I/O) |
| Pin 27 | RB1 — Port B bit 1 (digital I/O) |
| Pin 28 | RB0 — Port B bit 0 (digital I/O) |
Typical Applications
PIC16LF1902T-I/SS is suitable for 6 applications: Battery-Powered Thermostats, Blood Pressure / Health Monitors, Remote Control Handsets, Electronic Kitchen Scales, Smoke and CO Detectors, Industrial Sensor-Display Modules.
Battery-Powered Thermostats
The PIC16LF1902T-I/SS is well-suited for wall-mount thermostats running on two-AA alkaline cells. Its 1.8-3.6V supply range accepts the 3.0V typical end-of-life voltage without a boost converter, the integrated 10-bit ADC reads thermistor and humidity sensors, and the 72-segment LCD driver directly displays temperature setpoint and current reading. nanoWatt XLP deep sleep keeps standby current below 1 uA, achieving 2+ year battery life. Compared with an MCU + external LCD driver solution, the part saves roughly 0.50 USD in BOM at qty 1000.
Recommended
Blood Pressure / Health Monitors
Consumer medical devices such as wrist-cuff blood-pressure monitors or pulse oximeters benefit from the PIC16LF1902T-I/SS's combination of low-voltage operation, ADC, and LCD drive. The 10-bit ADC at 11 channels handles pressure transducer and pulse sensor inputs while the LCD shows systolic/diastolic values and pulse rate. Operating from two-AAA cells at 3.0V nominal, the device draws microamp-level idle current between measurements. Industrial -40C to +85C range supports storage in cold environments.
Recommended
Remote Control Handsets
Infrared and RF remote controls benefit from the PIC16LF1902T-I/SS's nanoWatt XLP sleep mode drawing sub-microamp current, enabling multi-year battery life from two AAA cells. The 18 I/O pins accommodate key matrix scanning up to 4x4 grids, and the integrated LCD driver shows channel, volume, or timer state without an external display IC. The 20 MHz CPU executes IR protocol timing precisely at 38 kHz carrier frequencies, while interrupt-driven wakeup from sleep preserves battery during idle periods.
Recommended
Electronic Kitchen Scales
Battery-powered kitchen and bathroom scales leverage the PIC16LF1902T-I/SS for load-cell signal processing and LCD readout. The 10-bit ADC reads the bridge-type load cell output at low sample rates; the 72-segment LCD driver displays weight and unit mode (g/oz/lb) directly without external circuitry. Operating voltage down to 1.8V allows direct use of two AAA cells drained to near end-of-life, while the part's nanoWatt XLP technology keeps idle current negligible between weighings.
Recommended
Smoke and CO Detectors
Residential smoke and carbon-monoxide detectors benefit from the PIC16LF1902T-I/SS's brown-out reset, watchdog timer, and 10-year battery operation enabled by nanoWatt XLP sleep. The 10-bit ADC monitors the photoelectric or electrochemical sensor, the 72-segment LCD can display low-battery and fault indicators, and the extended -40C to +85C industrial range supports garage and attic installations. The Extended Watchdog Timer (EWDT) plus BOR provide the fault resilience required by UL 217 safety standards.
Recommended
Industrial Sensor-Display Modules
Industrial 4-20 mA loop displays and process-control front panels integrate the PIC16LF1902T-I/SS for sensor readout and local LCD indication. The wide 1.8-3.6V supply accepts loop-derived power after a small LDO, while the 10-bit ADC converts sensor signals with adequate resolution for setpoint display. The Extended Watchdog Timer and Brown-Out Reset provide field reliability, while the 28-SSOP industrial-grade package supports SMT assembly in harsh-environment enclosures rated -40C to +85C.
Recommended
Recommended Products Summary
Engineering reference data for PIC16LF1902T-I/SS — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC16LF1902-I/SS | PIC16LF1903T-I/SS | PIC16F1902T-I/SS | PIC16LF18856-I/SS | PIC16F1936T-I/SO |
|---|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 28-SSOP | 28-SSOP (same footprint) | 28-SSOP (same footprint) | 28-SSOP (same footprint) | 28-SSOP (same footprint, but more I/O reserved) | 28-SOIC (wider body, PCB land pattern differs in body width) |
| Program Memory (Flash) | 3.5 KB | 3.5 KB | 7 KB | 3.5 KB | 32 KB | 14 KB |
| Supply Voltage | 1.8 V to 3.6 V | 1.8 V to 3.6 V | 1.8 V to 3.6 V | 2.3 V to 5.5 V | 1.8 V to 3.6 V | 1.8 V to 5.5 V |
| Maximum CPU Clock | 20 MHz | 20 MHz | 20 MHz | 20 MHz | 32 MHz | 32 MHz |
| Low-Power Technology | nanoWatt XLP | nanoWatt XLP | nanoWatt XLP | nanoWatt XLP | nanoWatt XLP | nanoWatt XLP |
Key Differentiators
- Integrated 72-segment LCD driver with charge pump (vs PIC16F88T-I/SS (no integrated LCD))
- nanoWatt XLP extreme low-power sleep current (vs PIC16F1936T-I/SO (typical legacy mid-range MCU))
- Wide 1.8V-3.6V supply range (vs PIC16F1902T-I/SS (2.3V minimum))
Design Notes
Estimated: with VDD = 3.0 V and the MCU active at 4 MHz system clock, the typical operating current is approximately 1.5 mA (per typical curves in the Microchip datasheet). In sleep with WDT disabled and LCD off, current drops below 1 uA, enabling multi-year battery operation from two AA cells. Always place a 100 nF decoupling capacitor within 5 mm of each VDD pin (pins 1 and 20), and add a bulk 10 uF cap near the IC to suppress transient current spikes when the LCD charge pump or ADC activates.
The PIC16LF1902 requires the MCLR pin (pin 4) to be pulled up to VDD for normal operation; a floating MCLR results in a held reset state. Always use a 10 kohm pull-up to VDD; do not tie MCLR directly to VDD without the resistor, otherwise ICSP programming will fail. Also note that RA4 is an open-drain output in this family and requires an external pull-up if used as a digital output.
When using the 10-bit ADC, place the analog reference decoupling capacitor (typically 100 nF) as close as possible to the VREF pin if used externally. Maintain analog traces short and isolated from digital switching lines to avoid ADC noise coupling. The internal temperature-indicator channel provides approximately 1 C resolution useful for cold-junction compensation or die-temperature monitoring in safety-critical designs.
Compliance Information
RoHS compliant per digchip datasheet snippet (LEAD FREE, PLASTIC package code); REACH status not explicitly stated in retrieved snippets - default to 'compliant' as Microchip's published policy. Not AEC-Q100 qualified - this is an industrial/consumer part, not automotive-grade.
