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NXP Semiconductors LPC11U34FHN33/421,
- Part No.:
- LPC11U34FHN33/421,
- Manufacturer:
- NXP Semiconductors
- Category:
- Microcontrollers
- Package:
- 32-VQFN Exposed Pad
- Datasheet:
-
LPC11U34FHN33/421,.pdf
- Description:
- IC MCU 32BIT 48KB FLASH 32HVQFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,482
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Product details
Overview
LPC11U34FHN33/421 from NXP Semiconductors is a 32-bit ARM Cortex-M0 microcontroller in HVQFN33 package, featuring 48 kB flash, 8 kB SRAM, 2 kB USB SRAM, 4 kB EEPROM, full-speed USB 2.0 device controller, and 10-bit ADC with 8 input channels. It operates at up to 50 MHz and supports RS-485/UART, I²C-FM+, two SSP interfaces, and four timers - ideal for compact USB-connected embedded control applications.
For engineers reviewing the LPC11U34FHN33/421 datasheet, LPC11U34FHN33/421 pinout, LPC11U34FHN33/421 application, or LPC11U34FHN33/421 equivalent, this page delivers verified technical context, exact pin functions per HVQFN33 layout, real-world use cases in medical peripherals and industrial USB devices, and validated alternative part selection guidance.
Technical Context
The LPC11U34FHN33/421 implements an ARM Cortex-M0 core with NVIC and system tick timer, paired with dedicated USB PLL and main PLL for independent clock domain management. Its memory subsystem includes 48 kB flash (sector/page erasable), 8 kB SRAM, 2 kB USB-dedicated SRAM, and 4 kB byte-programmable EEPROM with ROM API support.
Digital peripherals include 26 GPIO pins (with configurable pull-up/pull-down, repeater, and open-drain modes), one USART with RS-485/smart card support, two SSP controllers, one I²C-bus interface compliant with Fast-mode Plus (1 Mbit/s), and four general-purpose timers (two 16-bit, two 32-bit) with capture/match capability. No I/O Handler hardware is present - confirmed by Table 2 and Figure 1 block diagram exclusions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| CPU Core | ARM Cortex-M0, 32-bit RISC, up to 50 MHz operation - enables deterministic real-time control with Thumb-2 instruction set and low interrupt latency. |
| Flash Memory | 48 kB on-chip flash with 4 kB sector erase and 256 byte page erase - supports robust firmware updates and field reprogramming via ISP/IAP. |
| SRAM | 8 kB general-purpose SRAM + 2 kB USB-dedicated SRAM - separates USB data buffering from application memory, reducing bus contention during high-throughput transfers. |
| EEPROM | 4 kB on-chip EEPROM, byte-erasable and byte-programmable - retains calibration data, device IDs, or configuration settings across power cycles without external storage. |
| USB Interface | Full-speed USB 2.0 device controller with ROM-based drivers - eliminates USB stack footprint in flash and enables reliable enumeration and HID/CDC-class device implementation. |
| ADC | 10-bit SAR ADC with 8 input channels (AD0–AD7) - provides sufficient resolution for sensor monitoring in medical and industrial front-end signal acquisition. |
| GPIO | 26 programmable GPIO pins in HVQFN33 package, including 8 interrupt-capable inputs and 1 high-current sink (20 mA) true open-drain output - supports direct LED driving and level-shifting interfaces. |
Pinout & Package
HVQFN33 package: plastic thermal enhanced very thin quad flat package, no leads, 33 terminals, body size 7 × 7 × 0.85 mm. Exposed thermal pad (pin 33 = VSS) improves thermal dissipation in space-constrained USB peripheral designs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| RESET/PIO0_0 (Pin 2) | Reset input / GPIO | Active-low reset with 20 ns glitch filter; also selects debug mode (LOW = JTAG, HIGH = SWD); must be pulled HIGH externally in Deep power-down mode. |
| USB_DP / USB_DM (Pins 31, 32) | USB differential data pair | Full-speed USB 2.0 physical layer interface; requires 27 Ω series resistors and proper PCB routing for EMI compliance and signal integrity. |
| USB_VBUS (Pin 9) | USB bus voltage monitor | Detects presence of 5 V USB power; used by firmware to enable/disable USB device stack and manage power state transitions. |
| USB_CONNECT (Pin 15) | SoftConnect control | Software-controlled switch for 1.5 kΩ pull-up resistor on D+ - enables USB enumeration without mechanical switch or external logic. |
| PIO0_18/RXD & PIO0_19/TXD (Pins 31, 32) | USART receive/transmit | Primary UART interface supporting asynchronous mode, RS-485 half-duplex, and synchronous smart card (ISO 7816-3) protocols. |
| PIO0_4/SCL & PIO0_5/SDA (Pins 10, 11) | I²C-bus interface | Fast-mode Plus capable (1 Mbit/s), open-drain outputs with high-current sink when FM+ enabled - supports multi-master bus topologies and legacy I²C peripherals. |
Key Features
| Feature | Design Value |
|---|---|
| ARM Cortex-M0 with NVIC | Hardware-integrated interrupt controller with priority grouping and low-latency vectoring - reduces software overhead in time-critical ISR handling. |
| ROM-based USB drivers | Pre-validated USB device stack in boot ROM - saves ~4 kB flash and guarantees interoperability with host OS USB class drivers (CDC, HID). |
| Programmable Windowed Watchdog Timer (WWDT) | Dedicated low-power WDO clock source with windowed timeout enforcement - prevents runaway code while allowing safe firmware update windows. |
| Four reduced-power modes | Sleep, Deep-sleep, Power-down, and Deep power-down - enables sub-1 µA current draw in Deep power-down with wake-up via GPIO, USB activity, or watchdog. |
| Crystal oscillator range | 1 MHz to 25 MHz system oscillator - supports precise timing for USB frame generation and communication baud rates without external clock sources. |
Applications
| USB Audio Peripherals | Medical Diagnostic Handhelds |
|---|---|
Use Scenario: Compact USB-powered audio interface for PC-connected stethoscopes or hearing test equipment. IC Role / Device Role / Timing Role: MCU handles analog sensor signal conditioning via ADC, USB audio class (UAC) streaming, and real-time sample rate synchronization using crystal oscillator and USB SOF. Use Value: Integrated USB device controller and 48 kB flash enable standalone audio endpoint operation without external USB bridge IC or external memory. |
Use Scenario: Portable blood glucose meter with USB data export and on-device display control. IC Role / Device Role / Timing Role: Manages electrochemical sensor readout (10-bit ADC), LCD segment driver interface, USB mass storage emulation for log file transfer, and low-power sleep between measurements. Use Value: 4 kB EEPROM stores calibration coefficients and patient history; 26 GPIO support integrated button matrix and LED indicators without external logic. |
| Industrial USB Configuration Tools | RS-485 Field Device Programmer |
Use Scenario: Handheld commissioning tool for configuring Modbus RTU slave devices in factory automation systems. IC Role / Device Role / Timing Role: Acts as USB-to-serial bridge with configurable baud rates, parity, and stop bits; uses fractional baud rate generator for precise timing across 300–115.2 kbps. Use Value: Single-chip solution replaces dual-IC bridge designs; 48 kB flash accommodates multiple protocol parsers and UI assets. |
Use Scenario: Battery-powered field programmer for updating firmware on legacy RS-485 nodes via UART bootloader. IC Role / Device Role / Timing Role: Implements UART ISP over RS-485 physical layer using USART's built-in RS-485 direction control and automatic half-duplex timing. Use Value: Eliminates need for external RS-485 transceiver control logic; high-current GPIO drives RS-485 DE/RE lines directly. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microcontroller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LPC11U35FHN33/401 | 64 kB flash, same 8 kB SRAM + 2 kB USB SRAM, identical HVQFN33 pinout and peripheral set. | Supports larger firmware images (e.g., dual-bank OTA updates or extended USB class support) without changing PCB layout. | Select when firmware size exceeds 48 kB or future-proofing for feature expansion is required. |
| LPC11U34FBD48/421 | LQFP48 package (48 pins), 48 kB flash, 8 kB SRAM + 2 kB USB SRAM, adds 14 additional GPIO and one extra capture input (CT32B0_CAP1). | Enables more complex I/O mapping (e.g., parallel LCD interface or expanded sensor arrays) where board space allows larger package. | Choose when >26 GPIO or additional timer capture capability is needed and LQFP48 footprint is acceptable. |
Compared with LPC11U34FHN33/421, the LPC11U35FHN33/401 offers 16 kB more flash for advanced USB functionality or safety-certified code, while the LPC11U34FBD48/421 trades compactness for I/O scalability - both retain identical USB, ADC, and power management behavior.
Availability
LPC11U34FHN33/421 is available at Aetrix Electronics and suitable for USB peripheral design, medical handheld instrumentation, and industrial field programming tools requiring stable component supply, long-term lifecycle support, and consistent parametric performance across temperature (-40 °C to +85 °C).
Supply support for LPC11U34FHN33/421 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
NXP Semiconductors is a global semiconductor company headquartered in Eindhoven, Netherlands, specializing in secure connectivity solutions for automotive, industrial, and IoT markets.
The LPC11U3x product line was designed specifically for cost-sensitive, USB-connected embedded applications requiring low power, small footprint, and certified USB device functionality - targeting consumer peripherals, point-of-care medical devices, and industrial configuration tools.
FAQ
What is the maximum operating frequency of the LPC11U34FHN33/421?
The LPC11U34FHN33/421 operates at a maximum CPU frequency of 50 MHz, achieved using either the internal 12 MHz IRC oscillator with PLL multiplication or an external crystal oscillator (1 MHz to 25 MHz) with PLL scaling. This frequency is fully supported across its specified industrial temperature range (-40 °C to +85 °C).
Does the LPC11U34FHN33/421 include an I/O Handler peripheral?
No, the LPC11U34FHN33/421 does not include the I/O Handler hardware engine. According to Table 2 and the block diagram (Figure 1), I/O Handler is exclusive to the LPC11U37HFBD64/401 variant. The LPC11U34FHN33/421 relies on standard GPIO and peripheral controllers for serial interface implementation.
How much USB-dedicated RAM does the LPC11U34FHN33/421 provide?
The LPC11U34FHN33/421 provides 2 kB of dedicated USB SRAM, separate from its 8 kB general-purpose SRAM. This memory is allocated exclusively for USB endpoint buffers and descriptor tables, ensuring deterministic USB transaction timing without competing with application code or data.
What are the key differences between LPC11U34FHN33/421 and LPC11U34FHN33/311?
The LPC11U34FHN33/421 has 48 kB flash and 10 kB total SRAM (8 kB + 2 kB USB), whereas the LPC11U34FHN33/311 has 40 kB flash and only 8 kB SRAM. Both share identical HVQFN33 packaging, peripheral sets, and USB capabilities - the /421 variant supports larger firmware images and USB buffer-intensive applications.
Can the LPC11U34FHN33/421 operate from a single 3.3 V supply?
Yes, the LPC11U34FHN33/421 operates from a single 3.3 V supply within the 1.8 V to 3.6 V range. It includes integrated brownout detection with four programmable thresholds and Power-On Reset (POR), enabling robust operation in battery-powered or unregulated USB VBUS-derived supply environments.
LPC11U34FHN33/421, Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Package/Case:
- 32-VQFN Exposed Pad
- Series:
- LPC11Uxx
- Packaging:
- Tray
- Product Status:
- Active
- Programmable:
- Not Verified
- Core Processor:
- ARM® Cortex®-M0
- Core Size:
- 32-Bit Single-Core
- Speed:
- 50MHz
- Connectivity:
- I2C, Microwire, SmartCard, SPI, SSP, UART/USART, USB
- Peripherals:
- Brown-out Detect/Reset, POR, WDT
- Number of I/O:
- 26
- Program Memory Size:
- 48KB (48K x 8)
- Program Memory Type:
- FLASH
- EEPROM Size:
- 4K x 8
- RAM Size:
- 10K x 8
- Voltage - Supply (Vcc/Vdd):
- 1.8V ~ 3.6V
- Data Converters:
- A/D 8x10b
- Oscillator Type:
- Internal
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
LPC11U34FHN33/421, FAQ
1.How can I place an order for LPC11U34FHN33/421, through Aetrix?
Please submit a Request for Quotation (RFQ) for LPC11U34FHN33/421, on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for LPC11U34FHN33/421, reliable?
The price and inventory of LPC11U34FHN33/421, are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LPC11U34FHN33/421, is usually 5 days.
3.What payment methods are accepted for LPC11U34FHN33/421,?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LPC11U34FHN33/421, transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LPC11U34FHN33/421,?
LPC11U34FHN33/421, orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LPC11U34FHN33/421, order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for LPC11U34FHN33/421,?
For technical support, including LPC11U34FHN33/421, datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LPC11U34FHN33/421, requirements.
6.How does Aetrix verify that LPC11U34FHN33/421, is sourced from the original manufacturer or authorized distributors?
All LPC11U34FHN33/421, products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that LPC11U34FHN33/421, meets industry standards.
7.What is the process for return or replacement of LPC11U34FHN33/421,?
All LPC11U34FHN33/421, units undergo pre-shipment inspection (PSI). If there is an issue with LPC11U34FHN33/421,, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The LPC11U34FHN33/421, part is unused and in its original packaging.
Return procedure for LPC11U34FHN33/421,:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LPC11U34FHN33/421, Tags
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ATTINY4-TSHR
Microchip Technology
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ATTINY10-TSHR
Microchip Technology
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ATTINY10-TS8R
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ATTINY402-SSNR
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PIC16F15213T-I/MF
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PIC16F15213-E/MF
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PIC10F200T-I/OT
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ATTINY412-SSNR
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PIC10F202T-I/OT
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