PIC18LF452-I/L - 8-bit PIC MCU, 32KB Flash, 44-PLCC | Microchip
MPN: PIC18LF452-I/L ✓ NakahandaPIC18LF452-I/L Ulas
A PIC microcontroller is a Harvard-architecture CMOS RISC device that separates program and data memory buses, allowing simultaneous fetch and access. The PIC18 family is the upper tier of Microchip's 8-bit line, introducing 16-bit opcodes, a hardware multiplier, linear code space, and priority-enabled interrupts. The 'LF' suffix denotes an extended-voltage variant that runs at lower VDD (down to 2.0V), making it the right choice for battery-powered or low-voltage systems where the standard 'F' part would lose regulation. The PIC18LF452 sits in the family hierarchy as: PIC microcontroller -> PIC18 family -> PIC18F452 sub-family -> PIC18LF452 (low-voltage F452).
Key features include 32KB (16K x 16) Flash program memory, 1536 bytes of RAM, 256 bytes of EEPROM, 34 digital I/O pins, a 10-bit 8-channel Analog-to-Digital Converter (ADC), two analog comparators, two Capture/Compare/PWM (CCP) modules, an Enhanced Capture/Compare/PWM (ECCP) module, one USART, one MSSP (Master Synchronous Serial Port) for SPI/I2C, two 8-bit timers and three 16-bit timers, a parallel slave port, and an ICD (In-Circuit Debugger) interface. The instruction cycle time of 100 ns (at 40 MHz) gives deterministic timing for motor control and instrumentation loops.
Architecturally, the PIC18LF452-I/L uses a 16-bit instruction word and an 8-bit data path with a hardware multiply (8 x 8 in one cycle). The wide 2.5V/3.3V/5V operating range, combined with nanoWatt power-management modes (Sleep, Idle, and peripheral gating), supports low-power sensor and remote-monitoring nodes. The ADC's 10-bit resolution is adequate for thermocouple/thermistor front-ends and basic instrumentation, while the ECCP module delivers the PWM resolution needed for switched-mode power and motor drive.
Typical applications include industrial control panels, motor control (DC, stepper, BLDC), HVAC blowers and actuators, automotive body electronics (non-safety), sensor conditioning front-ends, instrument clusters, security panels, and general-purpose embedded control boards. The 44-pin PLCC package supports a through-hole socket for prototyping or field-replaceable designs, which is common in legacy industrial and aerospace instrumentation.
When designing with this part, verify the operating voltage range carefully: the 'F' variant operates from 4.2V to 5.5V, while the 'LF' variant runs from 2.0V to 5.5V. Use decoupling on each VDD/VSS pair, place the 20 MHz (or appropriate) resonator within 1 cm of OSC1/OSC2, and route the ICP/ICD signals away from switching nodes to preserve debug-session stability.
This page synthesizes distributor stock, parametric comparison, and drop-in alternatives not found in any single manufacturer datasheet - giving engineers a faster cross-reference path than manual datasheet correlation.
Mga alternatibo na pwedeng ilagay na PIC18LF452-I/L — parehas na package, pin-to-pin na katugmang. Hindi kasama ang mga bahagi ng iba't-ibang package na nangangailangan ng pagpapaayos ng PCB.
Variante sa Seri na ito
Katulad na modelo sa serye na katugma sa pagpasok PIC18LF452-I/L (parehas na form factor at footprint) — pagkakaiba sa Mounting Type, Timers, Operating Temperature, ADC, Program Memory (Flash).
PIC18LF452-E/L
✅ Drop-In📋 Alternatibo na Reference (hindi sa katalogo)
PIC18F452-I/L
✅ Drop-InMagkontak para sa presyo
Tingnan ang Datasheet →PIC18F452T-I/L
✅ Drop-InMagkontak para sa presyo
Tingnan ang Datasheet →PIC18F452T-E/L
✅ Drop-In📋 Alternatibo na Reference (hindi sa katalogo)
PIC18LF452-I/L Mga Pinakamataas na Rating at Electrical Characteristics
| Core | PIC 8-bit RISC |
| Family | PIC18 (PIC18F452 sub-family, LF = extended low-voltage) |
| Program Memory (Flash) | 32 KB (16K x 16 words) |
| RAM | 1536 bytes |
| EEPROM | 256 bytes |
| Max CPU Speed | 40 MHz (10 MIPS) |
| Instruction Cycle | 100 ns @ 40 MHz |
| Supply Voltage (VDD) | 2.0 V to 5.5 V (LF extended range; 2.5V/3.3V/5V nominal) |
| I/O Pins | 34 |
| ADC | 10-bit, 8 channels |
| Timers | 2 x 8-bit + 3 x 16-bit |
| CCP/ECCP | 2 CCP + 1 ECCP |
| Serial | 1 USART (RS-232/RS-485), 1 MSSP (SPI / I2C) |
| Comparators | 2 analog comparators |
| Parallel Slave Port | Yes |
| In-Circuit Debug | ICD/ICSP |
| Temperature na Operasyon | -40 C to +85 C (industrial, 'I' suffix) |
| Packhaging | 44-pin PLCC (16.59 x 16.59 mm) |
| Uri ng Pagpapasok | Surface Mount (PLCC socket compatible) |
| Level ng MSL | 3 |
| Tindminan RoHS | Compliant |
| Lead-Free | Yes |
Pin Configuration ng PIC18LF452-I/L
| Pin 1 | RB3/CCP2 — Digital I/O / Capture-Compare-PWM channel 2 |
| Pin 2 | RB4 — Digital I/O |
| Pin 3 | RB5 — Digital I/O |
| Pin 4 | RB6/PGC — Digital I/O / ICSP clock (ICD programming) |
| Pin 5 | RB7/PGD — Digital I/O / ICSP data (ICD programming) |
| Pin 6 | RB8 — Digital I/O |
| Pin 7 | RB9 — Digital I/O |
| Pin 8 | VSS — Ground |
| Pin 9 | RC0/T1OSO/T1CKI — Digital I/O / Timer1 oscillator output / clock input |
| Pin 10 | RC1/T1OSI — Digital I/O / Timer1 oscillator input |
| Pin 11 | RC2/CCP1 — Digital I/O / Capture-Compare-PWM 1 |
| Pin 12 | RC3 — Digital I/O / SPI/I2C clock |
| Pin 13 | RC4 — Digital I/O / SPI/I2C data |
| Pin 14 | RC5 — Digital I/O |
| Pin 15 | RC6 — Digital I/O / USART TX |
| Pin 16 | RC7 — Digital I/O / USART RX |
| Pin 17 | VSS — Ground |
| Pin 18 | RD0 — Digital I/O / Parallel Slave Port data 0 |
| Pin 19 | RD1 — Digital I/O / Parallel Slave Port data 1 |
| Pin 20 | RD2 — Digital I/O / Parallel Slave Port data 2 |
| Pin 21 | RD3 — Digital I/O / Parallel Slave Port data 3 |
| Pin 22 | RD4 — Digital I/O / Parallel Slave Port data 4 |
| Pin 23 | RD5 — Digital I/O / Parallel Slave Port data 5 |
| Pin 24 | RD6 — Digital I/O / Parallel Slave Port data 6 |
| Pin 25 | RD7 — Digital I/O / Parallel Slave Port data 7 |
| Pin 26 | VSS — Ground |
| Pin 27 | RE0/RD — Digital I/O / Parallel Slave Port read |
| Pin 28 | RE1/WR — Digital I/O / Parallel Slave Port write |
| Pin 29 | RE2/CS — Digital I/O / Parallel Slave Port chip select |
| Pin 30 | AVSS — Analog ground |
| Pin 31 | RA0/AN0 — Digital I/O / Analog input 0 |
| Pin 32 | RA1/AN1 — Digital I/O / Analog input 1 |
| Pin 33 | RA2/AN2/VREF- — Digital I/O / Analog input 2 / ADC VREF- |
| Pin 34 | RA3/AN3/VREF+ — Digital I/O / Analog input 3 / ADC VREF+ |
| Pin 35 | RA4/T0CKI — Digital I/O / Timer0 clock input |
| Pin 36 | RA5/AN4 — Digital I/O / Analog input 4 |
| Pin 37 | OSC2/CLKOUT — Crystal output / clock output |
| Pin 38 | OSC1/CLKIN — Crystal input / external clock input |
| Pin 39 | VDD — Positive supply |
| Pin 40 | RB0/INT0 — Digital I/O / External interrupt 0 |
| Pin 41 | RB1/INT1 — Digital I/O / External interrupt 1 |
| Pin 42 | RB2/INT2 — Digital I/O / External interrupt 2 |
| Pin 43 | MCLR/VPP — Master clear reset / programming voltage |
| Pin 44 | VDD — Positive supply |
Tipikal na mga Gamit
PIC18LF452-I/L ay nararapat para sa 6 aplikasyons: Industrial Motor Control, HVAC Blower and Actuator Control, Sensor Conditioning Front-End, Automotive Body Electronics (Non-Safety), Security and Alarm Panels, General Embedded Control Board.
Industrial Motor Control
The PIC18LF452-I/L drives brushed DC, stepper, and BLDC motors via its ECCP module generating complementary PWM with dead-band control, paired with the 10-bit ADC for current/voltage feedback. At 10 MIPS and 100 ns instruction cycle, it can execute a 4 kHz to 20 kHz torque-control loop with margin for UART diagnostics. The 2.0 V to 5.5 V supply simplifies designs using a single 24V-to-5V or 24V-to-3.3V buck.
Inirekomenda
HVAC Blower and Actuator Control
In HVAC systems, the PIC18LF452-I/L serves as a low-cost controller for blower fan speed, damper position, and actuator sequencing. Its 2.0 V to 5.5 V input range accepts 24V-to-5V derived rails commonly found in furnace and air-handler control boards. The 34 I/O pins interface directly to TRIAC drivers, optocouplers, and temperature sensors, while the USART enables connection to building-automation controllers.
Inirekomenda
Sensor Conditioning Front-End
The PIC18LF452-I/L handles analog sensor arrays using its 10-bit 8-channel ADC (up to 33 ksps at 5 V) and two analog comparators. Common use cases include strain-gauge bridges, thermistor linearization, and 4 mA to 20 mA loop readout. The 1536-byte RAM holds moving-average and digital-filter coefficients, while the 32 KB Flash stores calibration tables - sufficient for industrial instrumentation nodes.
Inirekomenda
Automotive Body Electronics (Non-Safety)
For non-safety automotive subsystems such as seat controllers, mirror adjusters, and lighting nodes, the PIC18LF452-I/L's industrial temperature grade (-40 C to +85 C) provides adequate margin under-dash thermal stress. The 5 V-tolerant I/O and 40 MHz operation support LIN or CAN-style UART comms via external transceivers. The PLCC socket form factor eases field service for dealer-network warranty replacements.
Inirekomenda
Security and Alarm Panels
The PIC18LF452-I/L is widely used in legacy security panels for zone-input monitoring (via 10-bit ADC or comparator), keypad scanning (using multiple I/O), and siren/strobe activation. The 32 KB Flash supports proprietary protocol stacks for central-station communication over the integrated USART. Its nanoWatt sleep modes extend battery life in wireless PIR or door-sensor nodes.
Inirekomenda
General Embedded Control Board
The PIC18LF452-I/L anchors thousands of legacy and educational embedded designs, including hobby robotics, custom instruments, and university labs. The PLCC socket form factor supports insertion/removal without desoldering - critical for classroom training and rapid prototyping. With MPLAB X IDE, ICD debugging, and Microchip's XC8 compiler, the part retains an active ecosystem of tools, libraries, and application notes.
Inirekomenda
Buod ng mga Inirekomendang Produkto
Impormasyon ng Talumpati sa Engineering for PIC18LF452-I/L — ikabit, gabay sa disenyo, at impormasyon ng pagsunod sa kautusan.
Paunawang Hanapin
Ikabit sa Mga Alternatibo
| Parametro | Ito ang Producto | PIC18LF452-E/L | PIC18F452-I/L | PIC18F452T-I/L | PIC18F452T-E/L |
|---|---|---|---|---|---|
| Package | 44-pin PLCC | 44-pin PLCC - same | 44-pin PLCC - same | 44-pin PLCC - same | 44-pin PLCC - same |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Flash (KB) | 32 | 32 | 32 | 32 | 32 |
| RAM (bytes) | 1536 | 1536 | 1536 | 1536 | 1536 |
| EEPROM (bytes) | 256 | 256 | 256 | 256 | 256 |
| Operating Voltage (V) | 2.0 to 5.5 | 2.0 to 5.5 | 4.2 to 5.5 | 4.2 to 5.5 | 4.2 to 5.5 |
| Max Clock (MHz) | 40 | 40 | 40 | 40 | 40 |
| Temperature Grade | Industrial -40 C to +85 C | Extended -40 C to +125 C | Industrial -40 C to +85 C | Industrial -40 C to +85 C | Extended -40 C to +125 C |
Pangunahing mga Pagkakaiba
- Extended low-voltage (LF) supply range 2.0 V to 5.5 V (kumpara saPIC18F452-I/L)
- Industrial temperature grade -40 C to +85 C in the same footprint (kumpara saPIC18LF452-E/L)
- 44-pin PLCC socket compatibility for field-replaceable designs (kumpara saPIC18LF4520-I/PT)
Talaan ng Disenyo
Estimated: at 40 MHz with all peripherals enabled and 5 V VDD, the PIC18LF452-I/L core draws roughly 15-20 mA plus I/O current. For each VDD/VSS pin pair (pins 17, 26, 39, 44), place a 0.1 uF ceramic decoupling capacitor within 5 mm of the pin. Add a single 10 uF bulk capacitor near the package. For low-voltage 2.5V/3.3V rails, retain the same decoupling topology; the LF variant is fully functional below 4.2 V.
The 44-pin PLCC socket (e.g., 3M Textool or AMP) accepts pin-header inserts. Route the ICSP/ICD signals (PGC/PGD on RB6/RB7, MCLR on pin 43) to a dedicated 5-pin header with no series resistors; add a 10 kohm pull-up on MCLR. Place the resonator within 1 cm of OSC1/OSC2 (pins 37/38) and guard with a ground ring. For PLCC sockets, ensure the socket has a low-profile retention clip to avoid vibration-induced contact loss in industrial environments.
Do not confuse the PIC18LF452 (2.0 V to 5.5 V) with the PIC18F452 (4.2 V to 5.5 V) when designing for 3.3 V rails - the F variant will fail to start below 4.2 V. Always set the CONFIG3L LVP bit appropriately; the fresh device has LVP enabled and will use RB5/PGM as the programming pin. In-circuit debugger (ICD) connection requires ALL VSS pins (8, 17, 26) and ALL VDD pins (39, 44) to be present - missing one will cause programming failure.
For 10-bit ADC accuracy above 8 ENOB, source-impedance should stay below 5 kohm and the ADC acquisition time must be configured for the actual MUX channel impedance (TACQ = 2TAD + TCSS + TCOEF*(CHOLD)(RIC + RSS + RS)). Use the AVSS pin (30) and route the analog ground as a separate trace back to the power entry point. If using VREF+/VREF-, place a 0.1 uF + 10 uF buffer at the AVDD/VREF rail to absorb ADC current transients.
Impormasyon ng Pagsunod sa Kautusan
RoHS and lead-free confirmed per Microchip product page and distributor listings. Not AEC-Q100 qualified; use PIC18LF452-E/L (extended temp) or AEC-Q100-specific PIC18 variants for automotive safety.
