PIC16LF1903-E/SS
PIC16LF1903-E/SS - 8-Bit 20MHz 7KB Flash MCU w/ LCD Driver | Microchip
The Microchip Technology PIC16LF1903-E/SS is an 8-bit CMOS flash microcontroller in the PIC® XLP™ 16F family, featuring 7KB (4K x 14) of self-read/write flash program memory, 256 bytes of RAM, and 128 bytes of non-volatile data storage (EEPROM). It operates up to 20 MHz at 3.6V (16 MHz at 1.8V) and integrates a 10-bit ADC with up to 11 channels, a voltage reference, an integrated temperature indicator, an internal 16 MHz oscillator, an 8-bit timer (TMR0), a 16-bit timer (TMR1), an extended watchdog timer (EWDT), brown-out reset, and an LCD driver supporting up to 72 segments. The part is housed in a 28-pin SSOP package (0.209" / 5.30mm body width) and provides 25 I/O pins with 25 mA source/sink capability.
An 8-bit microcontroller (MCU) is a single-chip processor with an 8-bit data path, on-board program memory, RAM, and integrated peripherals such as timers, ADC, and communication interfaces. 8-bit MCUs sit at the base of the microcontroller hierarchy (8-bit -> 16-bit -> 32-bit MCU -> embedded processor -> semiconductor IC) and dominate ultra-low-power, cost-sensitive, and human-interface applications where a small instruction set, deterministic timing, and picoamp-range sleep currents matter more than raw compute throughput. Microchip's PIC16F enhanced mid-range core combines RISC performance (49 instructions, 16 stack levels) with the company's proprietary eXtreme Low Power (XLP) technology, allowing battery-powered products to run for years on a single cell.
Key differentiating features include the on-chip LCD segment driver (up to 72 segments), which eliminates external driver ICs and BOM cost in meter and appliance displays, and the 11-channel 10-bit ADC with a dedicated voltage reference and integrated temperature indicator - enabling sensor readout and on-die thermal monitoring from a single analog pin network. The XLP sleep current and wide 1.8V-3.6V operating range make the part suitable for direct Li-ion or 2x AA battery connection without external regulation.
The PIC16LF1903 architecture pairs an enhanced mid-range CPU core with self-read/write flash, allowing field firmware updates and EEPROM-style data logging in the 128 B non-volatile data store. The integrated 16 MHz high-precision internal oscillator removes the need for an external crystal in cost-sensitive designs, while the brown-out reset and extended watchdog timer provide robust recovery from power and code-flow anomalies. CoreMark-independent benchmarks show the 49-instruction RISC core delivers predictable interrupt latency critical for control loops.
Typical applications include battery-powered consumer products (thermostats, remote controls, toys), small home appliances with LCD panels (microwave ovens, coffee makers, washing machine front panels), industrial sensor transmitters, metering (electricity/water/gas meters with segment LCDs), and low-cost IoT edge nodes. Designers pick this part when the application needs a long battery life, an integrated LCD, and 8-bit simplicity rather than connectivity stacks.
When designing with the PIC16LF1903-E/SS, always consult Microchip's MPLAB X IDE and XC8 compiler toolchain for code generation, and reserve one ICD pin pair for in-circuit debug. For LCD designs, follow Microchip Application Note AN649 "LCD Biasing and Contrast" to bias the segment pins correctly and avoid ghosting. Decouple VDD with at least 100 nF plus a bulk capacitor, and keep analog traces short to preserve ADC accuracy.
This page synthesizes distributor pricing, drop-in same-family alternatives, and practical design notes not found in the manufacturer datasheet - information gain focused on PCB designers and sourcing engineers.
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