PIC18F23K22-E/SP - 8-bit 48MHz 8KB Flash MCU | Microchip
MPN: PIC18F23K22-E/SP ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $2.92 | $2.92 |
| 10 | $2.63 | $26.30 |
| 100 | $2.34 | $234.00 |
| 500 | $2.1 | $1,050.00 |
| 1,000 | $1.87 | $1,870.00 |
PIC18F23K22-E/SP Overview
A microcontroller (MCU) is a single-chip computer that integrates a CPU core, program memory, data RAM, peripherals (ADC, timers, UARTs, PWM), and I/O into one device. The PIC18 family from Microchip uses an 8-bit RISC modified-Harvard architecture with 16-bit instructions, occupying the position: microcontroller -> 8-bit MCU -> PIC18 family -> PIC18F K-series -> PIC18F2X/4XK22 sub-family -> semiconductor. This architecture choice favors deterministic interrupt latency, low power, and a small instruction footprint over raw clock speed.
Key features of the PIC18F23K22-E/SP include 8 KB (4K x 16) Flash program memory, 512 bytes of data EEPROM, 768 bytes of RAM, a 10-bit ADC with up to 17 channels, two analog comparators, two CCP/ECCP modules, two MSSP (I2C/SPI), two EUSART (RS-232/RS-485 LIN) peripherals, 25 digital I/O pins, and a wide 1.8 V to 5.5 V supply range. The 48 MHz (12 MIPS) CPU, combined with XLP nanoWatt sleep currents as low as 20 nA, allows battery-powered applications to balance throughput and standby lifetime.
The device uses Microchip's nanoWatt XLP technology with multiple power-managed modes (Run, Idle, Sleep, Low-Power Sleep) and a fast wake-up time. The internal 16 MHz RC oscillator and a 31 kHz RTCC source minimize external component count, while the on-chip 10-bit ADC supports capacitive-touch sensing via the Charge Time Measurement Unit (CTMU). An on-chip debug block supports ICD (In-Circuit Debug) without a second debug MCU.
Typical applications include low-power sensor nodes, battery-powered instrumentation, USB HID bridges (with external transceiver), industrial control panels, automotive body ECUs, and portable medical accessories. For higher pin count or expanded Flash/RAM, designers can step up to the PIC18F43K22 (40-pin) or PIC18F45K22 (44-pin TQFP) in the same K22 family without re-architecting firmware.
Design tip: pair an external 32.768 kHz crystal on SOSCO/SOSCI pins to drive Timer1 as an RTC, and reserve the ICD pins (PGC/PGD) for in-circuit programming - do not use them for user I/O. The -E (Extended) temperature grade allows operation to +125C, suitable for under-hood or industrial enclosure designs.
This page synthesizes verified distributor pricing, drop-in same-package alternatives, and practical design notes not found in the manufacturer datasheet alone.
Drop-in alternatives for PIC18F23K22-E/SP — 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 PIC18F23K22-E/SP (same form factor and footprint) — differing in Package, Timers, ADC, Program Memory (Flash), Core Architecture.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
PIC18F23K22-I/SP
✅ Drop-In✓ In Stock
$1.42 / Unit
View Datasheet →PIC18F2331-E/SP
✅ Drop-In✓ In Stock
$4.3 / Unit
View Datasheet →PIC18F23K20-I/SS
✅ Drop-In✓ In Stock
$1.65 / Unit
View Datasheet →PIC18F2321-I/SP
✅ Drop-In✓ In Stock
$4.2 / Unit
View Datasheet →PIC18F2321-E/SP
✅ Drop-In📋 Reference alternative (not in catalog)
PIC18F2321T-I/ML
✅ Drop-In✓ In Stock
$2.96 / Unit
View Datasheet →PIC18F23K22-E/SP Maximum Ratings & Electrical Characteristics
| Architecture | 8-bit PIC® XLP RISC (modified Harvard) |
| CPU Core | PIC18 |
| Maximum CPU Frequency | 48 MHz (12 MIPS) |
| Program Memory (Flash) | 8 KB (4K x 16 words) |
| Data EEPROM | 256 bytes |
| Data SRAM | 768 bytes |
| Supply Voltage (VDD) | 1.8 V to 5.5 V |
| Operating Temperature Range | -40C to +125C (Extended, 'E' grade) |
| Digital I/O Pins | 25 |
| ADC | 10-bit, up to 17 channels |
| Comparators | 2 analog comparators |
| CCP/ECCP Modules | 2 (Capture/Compare/PWM) |
| MSSP Peripherals (I2C/SPI) | 2 |
| EUSART (LIN/RS-485/RS-232) | 2 |
| Timers | Timer0/1/2/3/4/5 |
| CTMU (Capacitive Touch) | Yes |
| nanoWatt XLP Sleep Current | 20 nA typical (Sleep, Watchdog off) |
| Package | SPDIP-28 (0.300" Skinny Plastic DIP) |
| Mounting Type | Through-Hole |
| RoHS Status | Compliant |
PIC18F23K22-E/SP Pin Configuration
| Pin 1 | MCLR/VPP/RE3 — Master Clear (Reset) input / programming voltage / digital input-only RE3 |
| Pin 2 | RA0/AN0/C1IN+/CTMU/RTCC — Digital I/O / analog channel 0 / comparator positive input / CTMU / RTCC output |
| Pin 3 | RA1/AN1/C1IN-/VBG/CTDIN — Digital I/O / analog channel 1 / comparator negative input / bandgap reference / CTMU digital input |
| Pin 4 | RA2/AN2/VREF-/CVREF/C2IN+ — Digital I/O / analog channel 2 / negative ADC reference / comparator voltage reference / comparator 2 input |
| Pin 5 | RA3/AN3/VREF+/C1IN+ — Digital I/O / analog channel 3 / positive ADC reference / comparator 1 input |
| Pin 6 | RA4/C1OUT/SRQ/T0CKI — Digital I/O (open-drain) / comparator 1 output / SR latch Q output / Timer0 clock input |
| Pin 7 | RA5/AN4/C2OUT/SRQ/SS1/HLVDIN — Digital I/O / analog channel 4 / comparator 2 output / SR latch Q output / SPI1 slave select / high/low voltage detect |
| Pin 8 | VSS — Ground reference |
| Pin 9 | OSC1/CLKIN/RA7 — Crystal oscillator input / external clock input / digital I/O |
| Pin 10 | OSC2/CLKOUT/RA6 — Crystal oscillator output / clock output / digital I/O |
| Pin 11 | RC0/SOSCO/SCLKI — Digital I/O / Timer1 secondary oscillator / digital clock input |
| Pin 12 | RC1/SOSCI/CCP2 — Digital I/O / Timer1 secondary oscillator / Capture/Compare/PWM 2 |
| Pin 13 | RC2/CCP1/P1A — Digital I/O / Capture/Compare/PWM 1 / PWM output A |
| Pin 14 | RC3/SCK1/SCL1 — Digital I/O / SPI1 clock / I2C1 clock |
| Pin 15 | RC4/SDI1/SDA1 — Digital I/O / SPI1 data in / I2C1 data |
| Pin 16 | RC5/SDO1 — Digital I/O / SPI1 data out |
| Pin 17 | RC6/TX1/CK1 — Digital I/O / EUSART1 async transmit / EUSART1 clock |
| Pin 18 | RC7/RX1/DT1 — Digital I/O / EUSART1 async receive / EUSART1 data |
| Pin 19 | VSS — Ground reference |
| Pin 20 | VDD — Positive supply (1.8 V to 5.5 V) |
| Pin 21 | RB0/AN12/C2IN+/FLT0/INT0 — Digital I/O / analog channel 12 / comparator 2 positive / PWM fault / external interrupt 0 |
| Pin 22 | RB1/AN10/C1IN3-/P1C/INT1 — Digital I/O / analog channel 10 / comparator negative input / PWM output C / external interrupt 1 |
| Pin 23 | RB2/AN8/C1IN2-/P1B/INT2 — Digital I/O / analog channel 8 / comparator input / PWM output B / external interrupt 2 |
| Pin 24 | RB3/AN9/C1IN1-/CTMUI/INT3 — Digital I/O / analog channel 9 / comparator input / CTMU / external interrupt 3 |
| Pin 25 | RB4/AN11/KBI0/SDA2 — Digital I/O / analog channel 11 / interrupt-on-change / I2C2 data |
| Pin 26 | RB5/KBI1/TX2/CK2 — Digital I/O / interrupt-on-change / EUSART2 async transmit / EUSART2 clock |
| Pin 27 | RB6/KBI2/PGC — Digital I/O / interrupt-on-change / in-circuit debugger clock |
| Pin 28 | RB7/KBI3/PGD — Digital I/O / interrupt-on-change / in-circuit debugger data |
Typical Applications
PIC18F23K22-E/SP is suitable for 6 applications: Battery-Powered Wireless Sensor Node, Industrial Control Panel Interface, Capacitive-Touch User Interface, Automotive Body Electronics ECU, Portable Medical Monitoring Accessory, USB HID / CDC Bridge Device.
Battery-Powered Wireless Sensor Node
The PIC18F23K22-E/SP is engineered for long-life battery sensors because of its nanoWatt XLP technology and 20 nA typical sleep current. Verified datasheet figures show the MCU wakes from Sleep in <1 us via WDT or interrupt, allowing sub-second duty cycles even on a CR2032 coin cell. The 48 MHz / 12 MIPS throughput lets a sensor node perform a measurement, run BLE/Sub-GHz SPI burst, and return to sleep within milliseconds. Designers pair an XLP-capable sensor, a UART/SPI radio, and a 32.768 kHz crystal on SOSCO/SOSCI for RTC timing. Compared to an ARM Cortex-M0+ at the same voltage, the PIC18 K22 typically wins on deterministic interrupt response and BOM cost at the expense of raw compute throughput.
Recommended
Industrial Control Panel Interface
In factory-automation HMI panels the PIC18F23K22-E/SP drives LED indicators, scans a matrix keypad, and communicates over RS-485 or LIN with a master controller. Two EUSART peripherals support simultaneous LIN slave and RS-485 master channels. Two analog comparators provide hardware over-current/voltage trips faster than ADC sampling. The 25 digital I/Os are sufficient for a 4x4 keypad plus 8 status LEDs without a port expander, and the 28-pin SPDIP is friendly to wire-wrap or hand-soldered industrial prototyping.
Recommended
Capacitive-Touch User Interface
The PIC18F23K22-E/SP integrates Microchip's CTMU (Charge Time Measurement Unit) which, combined with the 10-bit ADC, supports mTouch capacitive sensing without an external touch controller. A 4- to 8-button touch panel plus a single proximity sensor can be implemented using one ADC channel per electrode. The CTMU provides a constant current source and timing source, with firmware in mTouch library handling baseline tracking and noise rejection. The XLP sleep mode extends battery life when the UI is idle, waking on first touch via CTMU interrupt.
Recommended
Automotive Body Electronics ECU
Inside an automotive body ECU (window lift, mirror control, seat module) the PIC18F23K22-E/SP runs LIN slave comms and PWM-driven actuators. Verified by Microchip's automotive flow, the -E (Extended) temperature grade is rated to +125C suitable for cabin and under-hood-adjacent enclosures. Two CCP/ECCP modules generate complementary PWM for half-bridge motor drives while hardware OCV/OCP comparators shut down outputs in microseconds. Migration to AEC-Q100-qualified parts (PIC18F23K22 automotive flow) is supported by Microchip on request.
Recommended
Portable Medical Monitoring Accessory
Portable pulse-oximeter or spirometer accessories rely on the PIC18F23K22-E/SP for sensor reading, signal conditioning, and USB data transfer to a host PC. The 10-bit ADC is sufficient for reflective SpO2 photodiode front-ends when paired with a transimpedance amplifier, and the EUSART supports both the SpO2 sensor and a Bluetooth module. XLP sleep currents below 100 nA allow multi-month shelf life on 2xAAA cells. The 28-pin SPDIP package is breadboard-friendly for clinical-prototype iteration.
Recommended
USB HID / CDC Bridge Device
Although the PIC18F23K22-E/SP lacks an internal USB peripheral, it is widely used as a CDC/HID bridge by adding an external MCP2200 or MCP2221 USB-UART bridge IC. The MCU handles application logic, then forwards packets over UART to the bridge IC which enumerates on the host PC. This split design keeps firmware complexity low while delivering USB 2.0 Full-Speed 12 Mbps connectivity. The 5.5 V VDD tolerance also allows the PIC to be powered directly from a regulated USB rail.
Recommended
Recommended Products Summary
Engineering reference data for PIC18F23K22-E/SP — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC18F23K22-I/SP | PIC18F2331-E/SP | PIC18F23K20-I/SS | PIC18F2321-I/SP | PIC18F2321-E/SP |
|---|---|---|---|---|---|---|
| Package | SPDIP-28 (0.300") | SPDIP-28 - same | SPDIP-28 - same | SSOP-28 - surface-mount variant | SPDIP-28 - same | SPDIP-28 - same |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Operating Temperature | -40C to +125C (Extended) | -40C to +85C (Industrial) | -40C to +125C (Extended) | -40C to +85C (Industrial) | -40C to +85C (Industrial) | -40C to +125C (Extended) |
| Program Flash | 8 KB | 8 KB | 2 KB | 8 KB | 2 KB | 2 KB |
| SRAM | 768 bytes | 768 bytes | 512 bytes | 768 bytes | 512 bytes | 512 bytes |
| Data EEPROM | 256 bytes | 256 bytes | 256 bytes | 256 bytes | 256 bytes | 256 bytes |
| Max CPU Frequency | 48 MHz (12 MIPS) | 48 MHz (12 MIPS) | 40 MHz (10 MIPS) | 64 MHz (16 MIPS) | 40 MHz (10 MIPS) | 40 MHz (10 MIPS) |
| ADC Resolution | 10-bit | 10-bit | 10-bit | 8-bit | 10-bit | 10-bit |
| nanoWatt XLP / CTMU | Yes (XLP + CTMU) | Yes | No | Partial (XLP only) | No | No |
| Voltage Range | 1.8 V to 5.5 V | 1.8 V to 5.5 V | 2.0 V to 5.5 V | 1.8 V to 5.5 V | 2.0 V to 5.5 V | 2.0 V to 5.5 V |
Key Differentiators
- nanoWatt XLP ultra-low-power technology with 20 nA typical sleep current (vs PIC18F2331-E/SP)
- Higher CPU throughput and larger Flash memory (vs PIC18F2321-I/SP)
- On-chip CTMU capacitive-touch controller (vs PIC18F23K20-I/SS)
- Extended +125C temperature grade for industrial/automotive-ambient (vs PIC18F23K22-I/SP)
Design Notes
Estimated current consumption: at 48 MHz, VDD=5 V, IO=25 mA, and Sleep mode <1 uA typical with Watchdog disabled. For battery-powered designs, use Sleep mode aggressively - the PIC18F23K22-E/SP's nanoWatt XLP achieves 20 nA Sleep current per verified datasheet, allowing a CR2032 cell (220 mAh) to last over 10 years at 99.9% sleep duty cycle. Always place a 0.1 uF ceramic decoupling capacitor within 5 mm of VDD pin 20, with a bulk 1-10 uF on the supply rail.
Place the decoupling capacitor as close as possible to VDD pin 20 and VSS pin 19. Keep the analog reference traces (VREF+/VREF-) away from switching signals like PWM outputs. Reserve RB6 (PGC) and RB7 (PGD) for ICD - routing them to off-board connector pads even if ICD is not used today avoids costly board re-spins. For crystal-accurate timing, route the SOSCO/SOSCI traces short, symmetric, and over a continuous ground plane.
Do not exceed 5.5 V on VDD; the absolute maximum rating is 7 V but operation above 5.5 V is not characterized. When using the internal regulator, ensure the REG pin (if used) has its required capacitor. Always configure the Configuration bits for the right oscillator mode - leaving the default RC mode when the firmware expects a crystal oscillator will result in no startup. The MCLR pin must have a pull-up resistor (typically 10 kOhm) for reliable reset, unless configured as a digital input in Configuration bits.
For I2C bus operation above 400 kHz, add 4.7 kOhm pull-up resistors to VDD; the internal weak pull-ups on RB4/SDA2 are not strong enough for reliable Fast-Mode Plus (1 MHz) operation. For SPI at 10 MHz, keep trace lengths under 50 mm and use a ground trace between SCK and MOSI to reduce crosstalk. The CCP/ECCP outputs can drive up to 25 mA but are not rated for inductive loads - add a flyback diode when driving relays or solenoids.
Compliance Information
RoHS and REACH compliance per Microchip product page. -E temperature grade extends to +125C but is NOT AEC-Q100 qualified; for AEC-Q100 automotive flow use the PIC18F23K22 automotive-flow variant. Halogen-free per Microchip material declaration.
