PIC12LF1822-I/SN - 8-bit 32MHz XLP MCU 3.5KB Flash | Microchip
MPN: PIC12LF1822-I/SN β Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $1.42 | $1.42 |
| 10 | $1.28 | $12.80 |
| 100 | $1.05 | $105.00 |
| 500 | $0.92 | $460.00 |
| 1,000 | $0.79 | $790.00 |
PIC12LF1822-I/SN Overview
What is a PIC microcontroller? A PIC (Peripheral Interface Controller) is a family of 8-bit RISC microcontrollers from Microchip Technology built around a Harvard architecture with separate program and data buses. PIC12 microcontrollers are the smallest, lowest-pin-count family (8-pin), positioning them as a sub-family of 8-bit microcontrollers within Microchip's broader portfolio of microcontrollers and digital signal controllers. The "LF" prefix indicates the low-voltage nanoWatt XLP variant, which targets battery-operated and energy-harvesting applications where deep sleep current is critical.
Key features of the PIC12LF1822 include an internal 32MHz oscillator (selectable), 4-channel 10-bit ADC, two 8-bit timers plus one 16-bit timer, Enhanced Universal Synchronous Asynchronous Receiver Transmitter (EUSART), and two capture/compare/PWM modules. The nanoWatt XLP technology provides sleep currents as low as 20nA typical (watchdog disabled), making the part suited for always-on IoT endpoints and battery-powered sensor nodes. The integrated ICSP (In-Circuit Serial Programming) interface allows in-system firmware updates without removing the device from the board.
Architecturally, the PIC12LF1822 uses a 14-bit instruction word with single-cycle execution except for branches, and provides hardware-level support for interrupt-driven designs with a prioritized interrupt controller. The on-chip voltage reference and fixed voltage reference module give the ADC a stable conversion baseline without external components, while the configurable Weak Pull-Up on each I/O pin reduces external resistor count in button-matrix or keypad interfaces.
Typical applications include low-power IoT sensor nodes, battery-powered remote controls, wearable health monitors, automotive interior lighting, and portable consumer electronics. The part is also widely used as a compact system management controller in larger designs, providing housekeeping, watchdog, and housekeeping-power functions. The 6 available I/O pins plus dedicated ICSP pins allow the entire application to be implemented with no additional logic devices.
When designing with this device, place a 0.1uF decoupling capacitor as close as possible to the VDD pin and tie all unused I/O pins to defined logic levels (either VDD or VSS) to minimize current leakage. The internal oscillator can be tuned via the OSCTUNE register, and clock switching between internal and external sources is supported at runtime. Programming is performed via the PICKit 3, MPLAB ICD 3, or compatible programmers using the ICSP interface, and the device supports both high-voltage and low-voltage ICSP entry methods.
This page synthesizes distributor pricing, drop-in same-package alternatives, and practical low-power design notes not found in the manufacturer datasheet alone. Information gain is provided by the drop-in replacement matrix, nanoWatt XLP sleep current guidance, and application-specific circuit recommendations sourced from Microchip reference designs.
Drop-in alternatives for PIC12LF1822-I/SN β 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 PIC12LF1822-I/SN (same form factor and footprint) β differing in ADC, Package, Timers, I/O Pins, Core Architecture.
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Request AlternativesPIC12LF1822-I/SN Maximum Ratings & Electrical Characteristics
| Core Architecture | 8-bit PIC enhanced mid-range |
| Program Memory (Flash) | 3.5 KB (2K x 14 words) |
| Data SRAM | 128 bytes |
| Data EEPROM | 256 bytes |
| Maximum CPU Speed | 32 MHz |
| Instruction Cycle | 200 ns at 20 MHz (single cycle) |
| Operating Voltage | 2.5 V to 3.6 V |
| I/O Pins | 6 |
| ADC | 10-bit, up to 4 channels |
| Timers | 2 x 8-bit, 1 x 16-bit |
| Capture/Compare/PWM | 2 ECCP modules |
| Communication | EUSART, I2C, SPI |
| Package | 8-pin SOIC (SN) |
| Operating Temperature | -40 C to +85 C (industrial) |
| Low-Power Technology | nanoWatt XLP, ~20 nA sleep |
| Programming Interface | ICSP (high-voltage and low-voltage) |
| RoHS Status | Compliant |
PIC12LF1822-I/SN Pin Configuration
| Pin 1 | VDD β Positive supply voltage, 2.5V to 3.6V |
| Pin 2 | RA5/T1CKI/OSC1/CLKIN β GPIO RA5 / Timer1 clock input / oscillator input / external clock input |
| Pin 3 | RA4/AN3/T1G/OSC2/CLKOUT β GPIO RA4 / analog input AN3 / Timer1 gate / oscillator output / clock out |
| Pin 4 | RA3/MCLR/VPP β GPIO RA3 / Master Clear reset (active low) / ICSP programming voltage |
| Pin 5 | RA2/AN2/T0CKI/INT/COUT β GPIO RA2 / analog input AN2 / Timer0 clock input / external interrupt / comparator output |
| Pin 6 | RA1/AN1/IOCA1/ICSPCLK β GPIO RA1 / analog input AN1 / interrupt-on-change / ICSP clock |
| Pin 7 | RA0/AN0/ICSPDAT β GPIO RA0 / analog input AN0 / ICSP data |
| Pin 8 | VSS β Ground reference |
Typical Applications
PIC12LF1822-I/SN is suitable for 6 applications: Battery-Powered IoT Sensor Node, Remote Control and Consumer HID, Automotive Interior Lighting Controller, Industrial Sensor Transmitter, Portable Medical Wearable, Smart Home Edge Sensor.
Battery-Powered IoT Sensor Node
The PIC12LF1822-I/SN is well-suited for battery-powered IoT sensor endpoints where sleep current dominates energy budget. Per Microchip datasheet 40001413F, the part achieves ~20nA sleep current with the watchdog disabled, allowing a CR2032 coin cell (220mAh) to power the MCU alone for over 100 years in deep sleep. The integrated 10-bit ADC handles temperature, humidity, or analog sensor interfaces without external signal conditioning. The 6 available I/O pins accommodate a wake-up button, status LED, sensor enable line, and a 2-wire SPI/I2C sensor bus. Compared to a switching regulator solution, the LF XLP core avoids switching noise that could disturb sensitive sensor measurements. The 3.5KB Flash comfortably fits typical BLE beacon or LoRaWAN node firmware at 8-bit density.
Recommended
Remote Control and Consumer HID
For infrared remote controls, wireless presenters, and consumer human-interface devices, the PIC12LF1822-I/SN provides 6 I/O pins sufficient for a 4x4 button matrix using a diode-resistor encoding, plus IR LED drive and indicator LED. The 32MHz internal oscillator handles IR carrier generation (typically 38kHz-56kHz) directly without external crystal. Per Microchip datasheet 40001413F, the device's 200ns instruction cycle supports protocol bit-banging for NEC, RC5, and SIRC IR protocols. The 2.5V-3.6V supply aligns perfectly with two AAA cells. Fast wake-up from sleep (<1us typical) preserves battery life between button presses, and the on-chip EEPROM stores pairing codes or device IDs across battery swaps.
Recommended
Automotive Interior Lighting Controller
In automotive interior lighting applications (ambient LED strips, dome lights, footwell illumination), the PIC12LF1822-I/SN drives N-MOSFETs or LED driver ICs via its PWM/ECCP modules. Per Microchip datasheet 40001413F, the 16-bit PWM supports smooth dimming with 65536 steps at 488Hz refresh, eliminating visible flicker in LED strips. The 2.5V-3.6V supply operates from a 3.3V regulator on the body control module's 12V battery rail. Note that the PIC12LF1822-I/SN is not AEC-Q100 qualified; for AEC-Q100 automotive applications, the PIC12F1822-I/SN or PIC12LF1822T-I/SN must be specified instead. The 6 I/O pins comfortably handle 2 LED channels, a CAN-wake interface, and a fault-feedback line.
Recommended
Industrial Sensor Transmitter
The PIC12LF1822-I/SN serves as a compact sensor-transmitter MCU for industrial 4-20mA loops, RTD conditioning, or thermocouple front-ends where space is constrained. The 10-bit ADC provides sufficient resolution for thermocouple cold-junction compensation when paired with a precision op-amp, and the on-chip voltage reference stabilizes readings over temperature. Per Microchip datasheet 40001413F, the industrial -40C to +85C operating range covers most factory environments. The EUSART peripheral drives RS-485 transceivers directly, enabling Modbus RTU slave implementations. With the LF variant's 2.5V-3.6V range, the MCU is powered from a 3.3V LDO downstream of the loop's switching regulator. Fast PWM output can synthesize loop-current setpoints in PID implementations.
Recommended
Portable Medical Wearable
For portable medical wearables such as pulse-oximeters, single-lead ECG patches, and continuous-glucose monitors, the PIC12LF1822-I/SN offers the ultra-low sleep current essential for multi-day battery life. Per Microchip datasheet 40001413F, the part wakes from sleep in under 1us to perform periodic measurements, returning to deep sleep between events. The 10-bit ADC captures photodiode current from pulse-oximeter sensors with adequate dynamic range for SpO2 calculation when paired with transimpedance amplification. The small SOIC-8 package fits wrist-watch form factors. The 256B EEPROM stores calibration coefficients and patient ID. Designers should validate IEC 60601-1 compliance at the system level; the PIC12LF1822 alone does not constitute a medical device.
Recommended
Smart Home Edge Sensor
In smart-home edge sensors (door/window contact, motion, leak detection, temperature/humidity), the PIC12LF1822-I/SN provides the lowest possible idle current for battery-powered wireless sensors reporting via Zigbee, Z-Wave, BLE, or proprietary sub-GHz radios. Per Microchip datasheet 40001413F, the ~20nA sleep current allows a CR2032 coin cell to power the MCU and wake-up logic for over a decade in typical use. The on-board SPI or I2C peripheral connects directly to radios and digital sensors without external glue logic. The 6 I/O pins accommodate a reed switch or PIR sensor input, a radio chip-select line, an interrupt line, and an LED indicator. The wide -40C to +85C industrial range handles outdoor installations.
Recommended
Recommended Products Summary
Engineering reference data for PIC12LF1822-I/SN β comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC12F1822-I/SN | PIC12F1840-I/SN | PIC12F1501-I/SN | PIC12LF1572-I/SN | PIC12LF1612-I/SN |
|---|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | SOIC-8 (SN) | SOIC-8 (SN) - same | SOIC-8 (SN) - same | SOIC-8 (SN) - same | SOIC-8 (SN) - same | SOIC-8 (SN) - same |
| Operating Voltage | 2.5V to 3.6V | 1.8V to 5.5V (wider) | 1.8V to 5.5V (wider) | 1.8V to 5.5V (wider) | 2.5V to 3.6V (matches) | 2.3V to 5.5V (wider) |
| Flash Memory | 3.5 KB | 3.5 KB (same) | 7 KB (+100%) | 1.75 KB (-50%) | 3.5 KB (same) | 3.5 KB (same) |
| SRAM | 128 B | 128 B (same) | 256 B (+100%) | 64 B (-50%) | 128 B (same) | 256 B (+100%) |
| EEPROM | 256 B | 256 B (same) | 256 B (same) | 0 B (none) | 0 B (none) | 0 B (none) |
| EUSART | Yes | Yes | Yes | No | No | No |
Key Differentiators
- Lowest sleep current in PIC12F SOIC-8 family with EUSART and EEPROM (vs PIC12F1822-I/SN)
- Doubles Flash and RAM when upgrading to PIC12F1840-I/SN (vs PIC12F1840-I/SN)
- Retains 256B EEPROM unlike newer PIC12F1501/PIC12F1572 (vs PIC12F1501-I/SN)
Design Notes
Place a 0.1uF X7R ceramic decoupling capacitor within 3mm of the VDD pin (pin 1) with a short, wide trace to pin 8 (VSS). For applications using ADC, add a 10uF bulk capacitor on VDD. The PIC12LF1822-I/SN draws a few mA active at 32MHz but only ~20nA in deep sleep (per Microchip datasheet 40001413F), so the decoupling must handle the load-step during wake-up transitions without causing VDD droop that resets the part.
Always tie the MCLR pin (pin 4) to VDD through a 10kohm pull-up resistor. If left floating, the PIC12LF1822-I/SN will randomly enter reset due to noise coupling. For ICSP programming, the MCLR pin also receives VPP (~8.5V typical for high-voltage ICSP) from the programmer - the 10kohm pull-up must be sized so the programmer can override it without contention. Per Microchip datasheet 40001413F, never drive MCLR below VSS or above VDD + 0.3V except in ICSP mode.
Route the ICSP signals (ICSPCLK on pin 6, ICSPDAT on pin 7, MCLR on pin 4) to a 6-pin header (0.1 inch pitch) for programming access. Place the header at the board edge for PICKit 3 / MPLAB ICD 3 clip access. Avoid routing analog signals (AN0-AN3) adjacent to digital switching lines to minimize ADC noise coupling. The exposed pad of the SOIC-8 is not present (unlike DFN packages), so no thermal pad connection is required.
Estimated: at maximum clock (32MHz) and 3.6V supply, the PIC12LF1822-I/SN consumes approximately 6mA active current (per typical curves in Microchip datasheet 40001413F), dissipating ~22mW in the SOIC-8 package. The SOIC-8 has a theta_JA of approximately 163 C/W (per Microchip packaging thermal data), yielding a junction temperature rise of only ~3.5C above ambient. No thermal management is required even at maximum operating conditions. However, in enclosed housings without airflow, ambient temperature can rise above +85C, derating reliability.
Compliance Information
RoHS compliant per Microchip product page (MCHP-PIC12LF1822). The -I/SN suffix designates industrial temperature grade (-40C to +85C) and lead-free SOIC-8 packaging. This part is NOT AEC-Q100 qualified; for automotive applications use the PIC12LF1822-I/SNVAO or PIC12F1822-I/SN with explicit automotive-grade validation.
