PIC16LF1455-I/ST - 14KB Flash 48MHz USB MCU 14-TSSOP | Microchip
MPN： PIC16LF1455-I/ST ✓ 啟用中PIC16LF1455-I/ST 概覽
What is a PIC16F1455? It is a member of Microchip's enhanced mid-range 8-bit PIC16 microcontroller family, which bridges legacy baseline PIC cores and modern XLP (eXtreme Low Power) products. PIC16 microcontrollers use a Harvard RISC architecture optimized for deterministic interrupt latency and ultra-low power consumption; the 'LF' prefix denotes the low-voltage/foundry variant that supports lower Vdd operation, while the integrated USB 2.0 Full-Speed peripheral with on-chip clock recovery eliminates the external 12/24 MHz crystal typically required for USB.
Key features that distinguish this part include the integrated USB 2.0 module (rare in this pin-count and price tier), self-read/write Flash with high-endurance HEF (High Endurance Flash) for data EEPROM emulation, 12-bit ADC with computation, multiple communication peripherals (I2C/SPI/EUSART), and the nanoWatt XLP sleep modes that allow battery-powered designs. The 14-pin TSSOP gives designers 12 usable I/O lines while keeping the board footprint compact.
Architecturally, the PIC16F1455 uses a 14-bit instruction word, a single-cycle ALU with hardware multiply, and a 49-instruction set; the integrated USB SIE (Serial Interface Engine) handles packet framing and NRZI encoding without CPU intervention. The internal 48 MHz oscillator with 0.25% calibration supports USB Full-Speed operation directly, while a PLL derives the 48 MHz USB clock from lower-frequency sources.
Typical applications include low-cost USB HID/CDC devices, USB-to-UART bridges, battery-powered sensor nodes with USB charging/diagnostic interfaces, LED lighting controllers, and consumer peripherals. The combination of USB, ADC, and PWM makes it a frequent choice for human-interface and connectivity products.
Design consideration: USB designs must follow USB-IF signal-integrity guidelines - place the 0.1 uF Vbus decoupling capacitor within 2 mm of the VUSB pin and ensure the D+/D- traces are 90 ohm differential with no stubs. The internal 48 MHz oscillator eliminates one external component but does not allow fine-tuning for non-USB timings.
This page synthesizes distributor stock levels, drop-in alternatives, and applied design notes that go beyond the manufacturer datasheet.
直接替換替代品，適用於 PIC16LF1455-I/ST — 相同封裝，腳位對腳位相容。需重新設計 PCB 的不同封裝零件不列入。
此系列的變體
與下列產品可直接替換的同系列型號： PIC16LF1455-I/ST （相同外形與佔位） — 差異在於 USB Module, I/O Pins, Package, Operating Temperature, Communication Peripherals.
PIC16F1455-I/ST
✅ 直接替換聯絡詢價
查看資料表 →PIC16F1454-I/ST
✅ 直接替換聯絡詢價
查看資料表 →PIC16LF1454-I/ST
✅ 直接替換聯絡詢價
查看資料表 →PIC16LF1455-I/SL
✅ 直接替換聯絡詢價
查看資料表 →PIC16LF1455-I/P
✅ 直接替換聯絡詢價
查看資料表 →PIC16LF1455-I/ST 最大額定值與電氣特性
| Core Architecture | PIC16 enhanced mid-range 8-bit RISC |
| Instruction Set Size | 49 instructions |
| Program Memory (Flash) | 14 KB (8K x 14 words) |
| Data RAM | 1024 bytes |
| Non-volatile Data Storage (HEF) | 128 bytes |
| Stack Depth | 16 levels |
| Maximum CPU Speed | 48 MHz |
| Operating Voltage (LF suffix) | 2.3 V to 5.5 V |
| USB Module | USB 2.0 Full-Speed with on-chip clock recovery |
| I/O Pins | 12 |
| Communication Peripherals | I2C, SPI, EUSART, USB |
| Operating Temperature (I suffix) | -40 C to +85 C industrial |
| 封裝 | 14-pin TSSOP (ST) |
| 安裝類型 | Surface Mount |
| MSL 等級 | 1 (per JEDEC J-STD-020) |
| RoHS 狀態 | Compliant |
| Lead-Free (Pb-free) | Yes |
| AEC-Q100 Automotive | Not qualified (industrial grade) |
PIC16LF1455-I/ST 腳位配置
| 腳位 1 | VDD — Positive supply voltage (2.3 V to 5.5 V) |
| 腳位 2 | RA5 — Bidirectional I/O pin, digital only on this device |
| 腳位 3 | RA4 — Bidirectional I/O / analog channel |
| 腳位 4 | RA3/MCLR/VPP — Input only / Master Clear (reset, active low) / programming voltage |
| 腳位 5 | RC5 — Bidirectional I/O / analog channel |
| 腳位 6 | RC4/D- — Bidirectional I/O / USB D- (differential data line) |
| 腳位 7 | RB5/D+ — Bidirectional I/O / USB D+ (differential data line) |
| 腳位 8 | VSS — Ground reference |
| 腳位 9 | RA2/OSC1/CLKI — Bidirectional I/O / external clock input / crystal oscillator input |
| 腳位 10 | RA1/OSC2/CLKO — Bidirectional I/O / crystal oscillator output / clock output |
| 腳位 11 | RC0 — Bidirectional I/O / analog channel |
| 腳位 12 | RC1 — Bidirectional I/O / analog channel |
| 腳位 13 | RC2 — Bidirectional I/O / analog channel |
| 腳位 14 | RC3 — Bidirectional I/O / analog channel |
典型應用
PIC16LF1455-I/ST 適用於 6 應用s: USB HID Device / USB Keyboard / Mouse, USB-to-UART Bridge / Virtual COM Port, Battery-Powered Sensor Node with USB Diagnostic, USB LED Lighting Controller / WS2812 Strip Driver, USB Bootloader / Firmware Update Dongle, Consumer USB Peripheral / Toy Interface.
USB HID Device / USB Keyboard / Mouse
The PIC16LF1455-I/ST is ideal for low-cost USB HID devices because its integrated USB 2.0 Full-Speed Serial Interface Engine (SIE) handles NRZI encoding, bit stuffing, and packet framing entirely in hardware, freeing the 8-bit CPU to service the human-interface application. The internal 48 MHz HFINTOSC with on-chip clock recovery from USB host eliminates the 12/24 MHz crystal typically required, reducing BOM cost by $0.30+ and PCB area. The 14 KB Flash comfortably fits USB HID class descriptors, scan-matrix handling, and Caps Lock / Num Lock LED drive firmware. Combined with 12 I/O pins and nanoWatt XLP sleep modes below 50 nA, this part is a frequent choice for USB keyboards, mice, game controllers, and consumer HID peripherals in the 2.3-5.5 V supply range. Unlike VBUS-powered designs that need a regulator, the LF1455 can run directly from VBUS at 5 V while drawing milliwatts.
推薦
USB-to-UART Bridge / Virtual COM Port
The PIC16LF1455-I/ST is widely used as a USB-to-UART bridge (CDC class device) because the integrated USB module plus on-chip EUSART create a turnkey virtual COM port without external components. The 49-instruction PIC16 core handles USB CDC enumeration and EUSART baud-rate generation with cycle-accurate timing, while 1024 B RAM is sufficient for line-edit buffers and 128 B HEF holds persistent baud-rate and protocol settings. The TSSOP-14 footprint and 2.3 V VDD minimum allow operation from USB VBUS (5 V) or a 3.3 V regulator rail, giving designers flexibility for industrial adapter dongles. Designers should add 90 ohm differential routing on D+/D- lines and a 0.1 uF VUSB bypass capacitor within 2 mm of the pin, per Microchip USB design guidelines.
推薦
Battery-Powered Sensor Node with USB Diagnostic
The PIC16LF1455-I/ST suits battery-powered sensor nodes that occasionally connect via USB for diagnostics or charging because the nanoWatt XLP technology delivers sub-50 nA sleep current with watchdog disabled, and the integrated USB module provides diagnostic connectivity without a separate interface IC. The 12-bit ADC (computation-averaging capable) handles analog sensor channels while 14 KB Flash holds sensor-fusion and USB stack firmware. At 3.3 V operation the LF1455 draws only a few milliamps during active USB enumeration, allowing direct battery connection. Pin-count of 12 I/O is sufficient for typical 4-8 sensor channels plus status LEDs.
推薦
USB LED Lighting Controller / WS2812 Strip Driver
The PIC16LF1455-I/ST is a common choice for USB-controlled LED lighting because the integrated USB allows PC-based color and pattern control, while the 48 MHz CPU clock provides the precise 800 kbps / 400 kbps WS2812 / WS2811 timing required for addressable RGB LED strips. The 14 KB Flash fits USB class stacks plus WS2812 driver libraries, and 12 I/O can drive multiple LED data lines simultaneously. The 2.3 V VDD minimum supports direct 3.3 V or 5 V operation, allowing the MCU to share the LED strip's power rail without a separate regulator.
推薦
USB Bootloader / Firmware Update Dongle
The PIC16LF1455-I/ST is well-suited as a USB bootloader host that re-flashes downstream PIC microcontrollers in production because the integrated USB device interface enumerates as a HID or vendor-class bootloader, while the on-chip EUSART or ICSP pins drive target MCU programming. The 14 KB Flash holds the bootloader application plus a small command interpreter, and the HEF (high-endurance Flash) 128-byte area stores last-known-good firmware pointers across bootloader updates. The TSSOP-14 industrial temperature range (-40C to +85C) covers field deployment scenarios.
推薦
Consumer USB Peripheral / Toy Interface
The PIC16LF1455-I/ST is frequently selected for consumer USB peripherals and electronic toys because of its sub-$2 unit pricing, integrated USB 2.0 Full-Speed, and 14-pin TSSOP that fits inside compact enclosures. The PIC16 enhanced mid-range core runs deterministic 8-bit code at 48 MHz, sufficient for sensor polling, button debouncing, and USB HID reports. The 128-byte HEF storage area holds user preferences or game-state data across power cycles, and the XLP sleep mode extends battery life in portable toys. Designers use the LF1455 for USB-connected learning devices, game controllers, and PC peripherals.
推薦
推薦產品摘要
工程參考資料，適用於 PIC16LF1455-I/ST — 比較、設計指引及合規資訊。
選型指南
與替代品比較
| 參數 | 本產品 | PIC16F1455-I/ST | PIC16F1454-I/ST | PIC16LF1454-I/ST | PIC16LF1455-I/SL | PIC16LF1455-I/P |
|---|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 14-TSSOP (ST) | 14-TSSOP - same | 14-TSSOP - same | 14-TSSOP - same | 14-SOIC (different footprint, same pin count) | 14-PDIP through-hole (different footprint, same pin count) |
| Flash Memory | 14 KB | 14 KB | 8 KB (-43%) | 8 KB (-43%) | 14 KB | 14 KB |
| Data RAM | 1024 bytes | 1024 bytes | 512 bytes (-50%) | 512 bytes (-50%) | 1024 bytes | 1024 bytes |
| Minimum VDD | 2.3 V (LF) | 1.8 V (lower) | 1.8 V (lower) | 2.3 V (same) | 2.3 V (same) | 2.3 V (same) |
| USB Module | USB 2.0 Full-Speed with clock recovery | USB 2.0 Full-Speed with clock recovery | USB 2.0 Full-Speed with clock recovery | USB 2.0 Full-Speed with clock recovery | USB 2.0 Full-Speed with clock recovery | USB 2.0 Full-Speed with clock recovery |
| Maximum CPU Speed | 48 MHz (12 MIPS) | 48 MHz | 48 MHz | 48 MHz | 48 MHz | 48 MHz |
| Operating Temperature (I suffix) | -40 C to +85 C | -40 C to +85 C | -40 C to +85 C | -40 C to +85 C | -40 C to +85 C | -40 C to +85 C |
| Qty-1 Price (USD, 2026-09-22) | $2.07 | $2.07 (approx) | $1.80 (approx, lower) | $1.80 (approx, lower) | $2.10 (approx, similar) | $2.20 (approx, similar) |
主要差異化特點
- Lower 2.3 V minimum VDD operation (對比PIC16F1455-I/ST)
- Higher Flash density at this pin-count tier (對比PIC16F1454-I/ST)
- TSSOP-14 surface-mount footprint for compact designs (對比PIC16LF1455-I/P (PDIP-14))
設計說明
USB Full-Speed design requires careful PCB layout: route the D+ and D- lines as a 90 ohm differential pair with no stubs, keep them on the same layer, and place the 0.1 uF VUSB decoupling capacitor within 2 mm of the VUSB pin. Place a ferrite bead or 10 ohm resistor in series with VBUS to suppress ESD transients, and avoid routing D+/D- near clock traces or switching regulator nodes that could inject common-mode noise exceeding USB-IF masks.
The PIC16LF1455 needs a 1 kohm pull-up resistor on D+ (or D- for low-speed) to signal USB host connection - omitting this is the #1 cause of 'device not recognized' errors. The MCLR/RA3 pin defaults to MCLR mode after reset; to use it as a digital input, program the MCLRE configuration bit to 0 in CONFIG1. Do not exceed the absolute maximum VDD of 6.5 V, and ensure VDD rise time is < 300 ms to avoid incomplete Flash program cycles.
The 14-pin TSSOP package has a typical thermal resistance (theta_JA) of approximately 100 C/W when mounted on a JEDEC EIA/JESD51 4-layer test board; under typical USB enumeration loads (around 30 mA peak), self-heating is negligible. In enclosed USB dongle designs without airflow, derate to 70% of maximum temperature rise to account for thermal coupling to the USB connector and housing.
合規資訊
RoHS compliant per Microchip product page. Industrial grade (-40C to +85C) only - automotive grade variants have an -E or -F suffix and would require a separate part number. Halogen-free status not confirmed in this data set.
