PIC18LF452T-I/PT - 8-bit 40MHz 32KB Flash MCU 44-TQFP | Microchip
MPN: PIC18LF452T-I/PT ✓ نشطPIC18LF452T-I/PT نظرة عامة
An 8-bit microcontroller (MCU) is a single-chip computer built around an 8-bit data path CPU core, integrating Flash program memory, SRAM, EEPROM, and a rich set of peripherals including timers, ADC, UART, SPI, and I/O. The PIC18F family is positioned in the broader Microchip taxonomy as MCU -> 8-bit microcontroller -> embedded controller -> semiconductor. The "LF" prefix denotes the low-voltage (2.0V-5.5V) variant designed for battery-friendly and low-power applications, while "F" indicates Flash program memory.
Key features include 34 digital I/O pins, a 10-bit ADC with up to 8 channels, two Capture/Compare/PWM (CCP) modules, two USART modules, MSSP (SPI/I2C), 4 timers, two analog comparators, and a hardware 8x8 multiplier for integer arithmetic. The device supports In-Circuit Serial Programming (ICSP) and In-Circuit Debug (ICD), enabling field upgrades and real-time emulation without removing the part from the PCB.
Architecturally, the PIC18LF452 uses an enhanced RISC Harvard architecture with separate program and data buses, a 16-bit instruction word, and a 32-level hardware stack. This provides deterministic interrupt latency (typically 4 instruction cycles) and predictable execution timing, which is critical for real-time control loops. The "T" suffix indicates tape-and-reel packaging for high-volume assembly.
Typical applications include industrial automation controllers, sensor signal conditioning and data acquisition, low-power embedded control, USB/HID peripherals, automotive body electronics, and small-scale motor control. The wide 2.0V-5.5V operating range and 40 MHz throughput make it suitable for both battery-powered portable devices and line-powered industrial systems.
When designing with the PIC18LF452, note that Vdd rise time must follow Microchip's power-on sequencing recommendations to ensure a clean startup, and decoupling capacitors (100 nF plus 10 uF) should be placed within 5 mm of the Vdd/Vss pins. The /MCLR pin should be pulled up through a 10 kohm resistor unless the device is intended to remain in reset.
This page synthesizes distributor pricing, drop-in same-package alternatives, and practical design notes not found in the manufacturer datasheet alone, helping engineers shorten the BOM selection cycle and avoid common layout pitfalls on 44-TQFP land patterns.
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الطرازات في هذه السلسلة
طرازات من نفس السلسلة متوافقة تمامًا مع PIC18LF452T-I/PT (نفس عامل الشكل والبصمة) — يختلف في Package, Timers, Core Architecture, ADC, MSL Level.
PIC18LF452-I/PT
✅ بديل مباشرتواصل لمعرفة السعر
عرض ورقة البيانات ←PIC18LF4520-I/PT
✅ بديل مباشرتواصل لمعرفة السعر
عرض ورقة البيانات ←PIC18LF4523-I/PT
✅ بديل مباشرتواصل لمعرفة السعر
عرض ورقة البيانات ←PIC18LF4525T-I/PT
✅ بديل مباشرتواصل لمعرفة السعر
عرض ورقة البيانات ←PIC18F452T-I/PT
✅ بديل مباشرتواصل لمعرفة السعر
عرض ورقة البيانات ←PIC18LF442-I/PT
✅ بديل مباشرتواصل لمعرفة السعر
عرض ورقة البيانات ←PIC18LF452T-I/PT الحدود القصوى والخصائص الكهربائية
| Core Architecture | PIC18 (8-bit RISC Harvard) |
| CPU Speed (Max) | 40 MHz |
| Program Memory (Flash) | 32 KB (16K x 16) |
| Data RAM | 1536 bytes |
| Data EEPROM | 256 bytes |
| Operating Voltage Range | 2.0 V to 5.5 V |
| I/O Pins | 34 |
| ADC | 10-bit, up to 8 channels |
| Timers | 4 (Timer0/1/2/3) |
| CCP Modules | 2 |
| Serial Interfaces | 2x USART, 1x MSSP (SPI/I2C) |
| Analog Comparators | 2 |
| Hardware Multiplier | 8x8 |
| العلبة | 44-TQFP (10x10 mm) |
| درجة حرارة التشغيل | -40 C to +85 C (Industrial) |
| نوع التركيب | Surface Mount |
| مستوى MSL | 3 (per JEDEC J-STD-020) |
| حالة RoHS | Compliant |
| Programming/Debug | ICSP + ICD |
تكوين أطراف PIC18LF452T-I/PT
| دبوس 1 | /MCLR — Master Clear (reset) input / programming voltage |
| دبوس 2 | RA0/AN0 — PORTA bit 0 / analog input 0 |
| دبوس 3 | RA1/AN1 — PORTA bit 1 / analog input 1 |
| دبوس 4 | RA2/AN2/VREF- — PORTA bit 2 / analog input 2 / ADC VREF- |
| دبوس 5 | RA3/AN3/VREF+ — PORTA bit 3 / analog input 3 / ADC VREF+ |
| دبوس 6 | RA4/T0CKI — PORTA bit 4 / Timer0 clock input |
| دبوس 7 | RA5/AN4/SS — PORTA bit 5 / analog input 4 / SPI slave select |
| دبوس 8 | RE0/RD/AN5 — PORTE bit 0 / read control / analog input 5 |
| دبوس 9 | RE1/WR/AN6 — PORTE bit 1 / write control / analog input 6 |
| دبوس 10 | RE2/CS/AN7 — PORTE bit 2 / chip select / analog input 7 |
| دبوس 11 | VDD — Positive supply voltage (2.0V-5.5V) |
| دبوس 12 | VSS — Ground reference |
| دبوس 13 | OSC1/CLKI — Crystal oscillator input / external clock input |
| دبوس 14 | OSC2/CLKO — Crystal oscillator output / clock output |
| دبوس 15 | RC0/T1OSO/T1CKI — PORTC bit 0 / Timer1 oscillator output / Timer1 clock input |
| دبوس 16 | RC1/T1OSI/CCP2 — PORTC bit 1 / Timer1 oscillator input / CCP2 output |
| دبوس 17 | RC2/CCP1 — PORTC bit 2 / CCP1 output |
| دبوس 18 | RC3/SCK/SCL — PORTC bit 3 / SPI clock / I2C clock |
| دبوس 19 | RD0/PSP0 — PORTD bit 0 / parallel slave port bit 0 |
| دبوس 20 | RD1/PSP1 — PORTD bit 1 / parallel slave port bit 1 |
| دبوس 21 | RD2/PSP2 — PORTD bit 2 / parallel slave port bit 2 |
| دبوس 22 | RD3/PSP3 — PORTD bit 3 / parallel slave port bit 3 |
| دبوس 23 | RC4/SDI/SDA — PORTC bit 4 / SPI data in / I2C data |
| دبوس 24 | RC5/SDO — PORTC bit 5 / SPI data out |
| دبوس 25 | RC6/TX/CK — PORTC bit 6 / USART async transmit / sync clock |
| دبوس 26 | RC7/RX/DT — PORTC bit 7 / USART async receive / sync data |
| دبوس 27 | RD4/PSP4 — PORTD bit 4 / parallel slave port bit 4 |
| دبوس 28 | RD5/PSP5 — PORTD bit 5 / parallel slave port bit 5 |
| دبوس 29 | RD6/PSP6 — PORTD bit 6 / parallel slave port bit 6 |
| دبوس 30 | RD7/PSP7 — PORTD bit 7 / parallel slave port bit 7 |
| دبوس 31 | VSS — Ground reference |
| دبوس 32 | VDD — Positive supply voltage (2.0V-5.5V) |
| دبوس 33 | RB0/INT0 — PORTB bit 0 / external interrupt 0 |
| دبوس 34 | RB1/INT1 — PORTB bit 1 / external interrupt 1 |
| دبوس 35 | RB2/INT2 — PORTB bit 2 / external interrupt 2 |
| دبوس 36 | RB3/INT3/CCP2 — PORTB bit 3 / external interrupt 3 / CCP2 alt |
| دبوس 37 | RB4 — PORTB bit 4 (interrupt-on-change) |
| دبوس 38 | RB5 — PORTB bit 5 (interrupt-on-change) |
| دبوس 39 | RB6/PGC — PORTB bit 6 / ICSP clock / interrupt-on-change |
| دبوس 40 | RB7/PGD — PORTB bit 7 / ICSP data / interrupt-on-change |
| دبوس 41 | AVSS — Analog ground reference |
| دبوس 42 | AVDD — Analog positive supply (2.0V-5.5V) |
| دبوس 43 | NC — Not connected (per datasheet) |
| دبوس 44 | NC — Not connected (per datasheet) |
التطبيقات النموذجية
PIC18LF452T-I/PT مناسب لـ 6 التطبيقs: Industrial Automation & Sensor Conditioning, Low-Power Battery-Powered Embedded Control, Small-Scale Motor Control & PWM Drive, HID / USB Human Interface Devices, Automotive Body Electronics, Data Acquisition Front-End.
Industrial Automation & Sensor Conditioning
The PIC18LF452T-I/PT fits industrial automation applications because its 34 I/O pins, 10-bit ADC with up to 8 channels, and 40 MHz / 10 MIPS throughput allow real-time reading of multiple analog sensors (temperature, pressure, flow) while driving relays and actuators through the CCP/PWM modules. The wide 2.0V-5.5V supply range supports both 24V-derived 5V and 3.3V sensor rails, and the -40C to +85C industrial temperature grade handles factory-floor environments. The 256 B EEPROM provides non-volatile storage for calibration constants, while ICSP enables field firmware updates without disassembly. In a typical sensor-conditioning node, the MCU reads 4-8 analog inputs, applies digital filtering, and reports results over UART or RS-485 - a workload well within its capabilities.
موصى به
Low-Power Battery-Powered Embedded Control
The PIC18LF452T-I/PT fits low-power battery designs because the 'LF' variant operates down to 2.0V, which is below the 2.8V-3.0V cutoff of most lithium-thionyl-chloride (Li-SOCl2) primary cells and AA/AAA alkaline packs under load. The PIC18 nanoWatt technology provides multiple sleep modes (Sleep, Idle, and deep variants) that drop quiescent current to well under 1 uA in deep sleep, enabling multi-year battery life in remote sensor nodes. The 34 I/O lines can wake the MCU from sleep on edge transitions, while internal peripherals (timers, ADC, comparators) can also wake the core periodically. This makes it ideal for wireless sensor transmitters, portable data loggers, and remote metering applications where each uA of quiescent current translates directly to field-replacement cost.
موصى به
Small-Scale Motor Control & PWM Drive
The PIC18LF452T-I/PT fits small-scale motor control because the two on-chip CCP modules can drive complementary PWM outputs for brushed DC, stepper, or three-phase BLDC motors up to modest power levels. The 10-bit ADC samples motor current and back-EMF for closed-loop control, while the 40 MHz / 10 MIPS throughput executes PID loops at kHz rates. The two analog comparators enable hardware over-current and over-temperature protection independent of the ADC, allowing safety shutdown within microseconds. Hardware PWM dead-band generation (available via the enhanced CCP in software) reduces shoot-through in H-bridges. For 12V or 24V motors, place the MCU on the logic-side and pair it with an external gate driver such as an MCP1416 or MCP14700.
موصى به
HID / USB Human Interface Devices
The PIC18LF452T-I/PT fits low-speed USB Human Interface Devices when paired with an external USB transceiver such as the MCP2200 or MCP2221, because its USART and 10 MIPS throughput easily handle the 1.5 Mbps low-speed USB signaling via bit-banging or a soft-stack. The 32 KB Flash accommodates full USB HID class descriptors, report buffers, and application logic, while 1536 B RAM is sufficient for keyboard matrices up to ~120 keys plus modifier bytes. The 2.0V-5.5V supply range supports bus-powered (5V) and self-powered (3.3V) designs. ICSP programming allows OEMs to update device firmware after keyboard matrix tooling is finalized, shortening time-to-market for custom HID products like programmable keypads, macro pads, and gaming controllers.
موصى به
Automotive Body Electronics
The PIC18LF452T-I/PT fits automotive body-electronics applications such as mirror controllers, seat-position memories, and lighting controllers when the design stays inside the -40C to +85C industrial temperature range (the PIC18LF452T-I/PT is NOT an AEC-Q100 qualified SKU - for AEC-Q100 compliance, the PIC18F452-I/PT automotive-grade variant is required). Its 34 I/O pins can drive LED arrays, read switch matrices, and command LIN-bus transceivers like the MCP2003B. The 10-bit ADC monitors battery voltage and current sense resistors for short-circuit detection, while the 256 B EEPROM retains user settings (seat position, mirror tilt) across battery disconnects. A typical body-controller firmware fits well within 32 KB Flash and runs comfortably at 40 MHz on a 12V-derived 5V rail.
موصى به
Data Acquisition Front-End
The PIC18LF452T-I/PT fits multi-channel data acquisition front-ends because its 10-bit ADC with up to 8 channels, 4 timers, and 2 CCP modules provide enough analog input and timing resources to sample, time-stamp, and buffer sensor data at kHz rates. The 1536 B RAM holds 750+ 10-bit samples for block-transfer buffering, while the 256 B EEPROM stores calibration coefficients. The MSSP (SPI/I2C) module can connect to external 12-16 bit ADCs when higher resolution is needed (e.g., MCP3201 for 12-bit, MCP3421 for 18-bit), and the two USARTs simultaneously drive an RS-232/RS-485 host link plus a debug console. This makes the MCU a strong fit for portable vibration loggers, environmental monitors, and industrial test stands.
موصى به
ملخص المنتجات الموصى بها
بيانات مرجعية هندسية لـ PIC18LF452T-I/PT — المقارنة وإرشادات التصميم ومعلومات الامتثال.
دليل الاختيار
المقارنة مع البدائل
| المعامل | هذا المنتج | PIC18LF452-I/PT | PIC18LF4520-I/PT | PIC18LF4523-I/PT | PIC18LF4525T-I/PT | PIC18F452T-I/PT |
|---|---|---|---|---|---|---|
| Package | 44-TQFP (10x10) | 44-TQFP (10x10) - same | 44-TQFP - same | 44-TQFP - same | 44-TQFP - same | 44-TQFP - same |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Core | 8-bit PIC18 (RISC) | 8-bit PIC18 (RISC) | 8-bit PIC18 (RISC) | 8-bit PIC18 (RISC) | 8-bit PIC18 (RISC) | 8-bit PIC18 (RISC) |
| Max Clock | 40 MHz (10 MIPS) | 40 MHz (10 MIPS) | 40 MHz (10 MIPS) | 40 MHz (10 MIPS) | 40 MHz (10 MIPS) | 40 MHz (10 MIPS) |
| Operating Voltage | 2.0V to 5.5V | 2.0V to 5.5V | 2.0V to 5.5V | 2.0V to 5.5V | 2.0V to 5.5V | 4.2V to 5.5V (not LF) |
| Flash Memory | 32 KB | 32 KB | 32 KB | 32 KB | 48 KB (+50%) | 32 KB |
| RAM | 1536 B | 1536 B | 1536 B | 1536 B | 2560 B (+67%) | 1536 B |
| I/O Pins | 34 | 34 | 36 | 36 | 36 | 34 |
| ADC Channels | 8 x 10-bit | 8 x 10-bit | 11 x 10-bit | 12 x 12-bit | 12 x 10-bit | 8 x 10-bit |
أبرز الفروقات
- Wide 2.0V-5.5V supply range enables battery-powered designs (مقابلPIC18F452T-I/PT)
- Same 44-TQFP footprint with tray-packaged drop-in alternative (مقابلPIC18LF452-I/PT)
- Industrial -40C to +85C temperature grade for harsh environments (مقابلPIC18LF252-I/SO (28-pin variant))
ملاحظات التصميم
Decouple Vdd/Vss pairs (pins 11/12 and 31/32) with 100 nF ceramic + 10 uF bulk within 5 mm of the IC. The AVDD/AVSS pins (42/41) supplying the ADC require their own dedicated 100 nF + 10 uF RC filter (e.g. 10 ohm ferrite) to keep ADC SNR above 60 dB. Estimated: with 5V supply and 40 MHz operation, Vdd current peaks at ~30 mA active; the bulk cap prevents 50 mV+ dips during peripheral switching.
Route the 44-TQFP land pattern with 0.8 mm pitch - all signals should escape the inner row (pins 16-30) between outer-row pads. Keep clock traces (OSC1/OSC2, pin 13/14) under 10 mm and guard with a ground pour on both sides. The ICSP pins (RB6/RB7, /MCLR) must be brought out to a 6-pin header or test points for production programming - do not bodge these signals.
Do NOT leave /MCLR floating - tie it to Vdd through a 10 kohm pull-up (and optionally a 100 nF cap to ground for noise immunity). Floating /MCLR causes erratic resets in noisy environments. When using ICSP, the pull-up must be 10 kohm or larger to avoid loading the programmer's Vpp pulse. Also note: the LF variant requires Vdd >= 2.0V for the regulated POR threshold; below this, internal state may be undefined.
For ADC accuracy above 8 ENOB, drive analog inputs (AN0-AN7) via low-impedance buffers (op-amp source impedance < 2.5 kohm) and add 100 ns acquisition time in firmware. The internal 10-bit ADC sample-and-hold requires the source impedance to settle within 1/2 LSB at the selected acquisition window; estimated settling error with 10 kohm source is 2 LSB at 5V Vref. Use AN3/VREF+ for an external precision reference if absolute accuracy is needed.
معلومات الامتثال
RoHS compliant per Microchip product page. Industrial -40C to +85C grade, but NOT AEC-Q100 qualified - choose PIC18F452 automotive variants for AEC-Q100 compliance.