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NXP Semiconductors P89LPC921FDH,518
- Part No.:
- P89LPC921FDH,518
- Manufacturer:
- NXP Semiconductors
- Category:
- Microcontrollers
- Package:
- 20-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
P89LPC921FDH,518.pdf
- Description:
- IC MCU 8BIT 4KB FLASH 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,970
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Product details
Overview
P89LPC921FDH,518 from NXP Semiconductors (formerly Philips) is a 4 kB Flash, 256-byte RAM, 8-bit microcontroller based on an accelerated two-clock 80C51 core operating up to 18 MHz, featuring dual 16-bit timers, real-time clock, two analog comparators, and I²C/UART peripherals - deployed in low-power industrial sensor nodes and embedded control modules.
For engineers reviewing the P89LPC921FDH,518 datasheet, P89LPC921FDH,518 pinout, P89LPC921FDH,518 application, or P89LPC921FDH,518 equivalent, key selection criteria include its 4 kB Flash capacity, TSSOP20 package with 20-pin I/O mapping, 2.4–3.6 V operation with 5 V-tolerant I/Os, and integrated RC oscillator calibrated to ±1% at 7.373 MHz.
Technical Context
The P89LPC921FDH,518 executes instructions in two to four CPU clocks - six times faster than standard 80C51 cores at identical frequencies - using a dual-cycle architecture with CCLK derived from selectable clock sources: internal RC (7.373 MHz ±1%), watchdog oscillator (400 kHz), or external crystal/resonator (20 kHz–18 MHz). Its DIVM register enables programmable CPU clock division.
Peripherals are synchronized to PCLK (CCLK/2) and include an enhanced UART with fractional baud rate generator and break detection, 400 kHz I²C-bus interface, and two analog comparators with configurable inputs and reference source - all supported by four interrupt priority levels and keypad interrupt pattern matching on Port 0.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Core Architecture | Accelerated two-clock 80C51 CPU executing most instructions in 2–4 CCLK cycles; 6× performance vs. standard 80C51 at same frequency. |
| Flash Memory | 4 kB user-programmable Flash with 1 kB erasable sectors and 64-byte page erase - supports in-application programming (IAP) and secure serial production programming. |
| RAM | 256-byte on-chip data RAM for variable storage and stack operations during real-time execution. |
| Operating Voltage | 2.4 V to 3.6 V supply range with 5 V-tolerant I/O pins - enables direct interfacing with legacy 5 V logic without level shifters. |
| Max Clock Frequency | 18 MHz system clock (CCLK) with oscillator options spanning 20 kHz–18 MHz - supports low-power RTC operation or high-speed control loops. |
| I/O Count | 15–18 configurable I/O pins (TSSOP20 package), including Schmitt-trigger inputs and programmable output modes (quasi-bidirectional, open-drain, push-pull, input-only). |
| Power Modes | Idle mode and two Power-down modes; typical Power-down current is 1 µA (with voltage comparators disabled) - optimized for battery-powered endpoints. |
Pinout & Package
TSSOP20 plastic thin shrink small outline package (SOT360-1), 20 leads, body width 4.4 mm - surface-mount compatible with standard reflow profiles and space-constrained PCB layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| P0.0 / KBI0 / CMP2 | Port 0 bit 0, keyboard interrupt 0 input, comparator 2 output | Multi-function I/O supporting wake-up on keypad activity or analog threshold detection. |
| P1.7 / P1.6 / P1.4 | General-purpose I/O with high-current drive capability (20 mA) | Direct LED or small relay driving without external buffers - limited to P89LPC9221 per datasheet; not applicable to P89LPC921FDH,518. |
| RST / P1.5 | Active-low reset input (configurable via Flash bits) | Enables external reset assertion; required for oscillator frequencies >12 MHz - must be enabled in Flash configuration. |
| XTAL1 / P3.1 & XTAL2 / CLKOUT / P3.0 | Clock input / crystal connection and clock output | Supports crystal/resonator (20 kHz–18 MHz) or external clock; CLKOUT provides CCLK/2 when crystal not used. |
| SDA / INT0 / P1.3 & SCL / T0 / P1.2 | I²C data line / external interrupt 0 / timer 0 input & I²C clock / timer 0 output | Dual-role pins enable compact I²C peripheral integration and hardware timer triggering from external events. |
Key Features
| Feature | Design Value |
|---|---|
| Configurable on-chip oscillator | Factory-calibrated 7.373 MHz ±1% RC oscillator eliminates need for external crystal; trimmable via 6-bit TRIM register for system-specific tuning. |
| Real-time clock (RTC) | Dedicated RTC module usable as system timer or calendar clock - operates independently of main CPU clock source and supports wake-up from Power-down. |
| Enhanced UART | Includes fractional baud rate generator, break detect, framing error detection, automatic address recognition, and versatile interrupt handling - simplifies RS-485 or multi-drop bus implementation. |
| Programmable port output types | Each I/O pin supports quasi-bidirectional, open-drain, push-pull, or input-only modes - enables precise drive strength and signal integrity control per peripheral interface. |
| Port input pattern match | Port 0 generates interrupt when pin states match or mismatch a programmable 8-bit pattern - enables efficient keypad scanning or state-change monitoring without CPU polling. |
Applications
| Industrial Sensor Node | Smart Meter Interface |
|---|---|
Use Scenario: Battery-powered temperature/humidity sensor collecting data every 30 seconds and transmitting via UART to concentrator. IC Role / Device Role / Timing Role: Primary controller executing sensor read, RTC-based scheduling, low-power sleep/wake cycles, and UART transmission. Use Value: 1 µA Power-down current and RTC wake-up eliminate external real-time scheduler; 4 kB Flash accommodates firmware + calibration tables. |
Use Scenario: Pulse-counting interface between mechanical meter and RF module in residential electricity meter. IC Role / Device Role / Timing Role: Edge-triggered counter (T0/T1) capturing meter pulses, UART bridging to RF IC, and I²C reading of auxiliary sensors. Use Value: Dual 16-bit timers support simultaneous pulse counting and communication timing; 5 V-tolerant I/O interfaces directly with meter's dry-contact outputs. |
| Embedded HVAC Controller | Legacy Equipment Retrofit Module |
Use Scenario: Fan speed regulation and temperature feedback loop in duct-mounted HVAC unit with minimal board space. IC Role / Device Role / Timing Role: PWM generation (via timer overflow toggle), analog comparator-based overtemperature shutdown, and UART diagnostics. Use Value: Timer-configured PWM output drives fan MOSFET directly; comparators provide hardware-level thermal safety independent of firmware execution. |
Use Scenario: Adding digital logging and remote alert capability to existing 24 V AC industrial panel with no native microcontroller. IC Role / Device Role / Timing Role: Isolated I/O translator, event logger (Flash-stored timestamps), and UART-to-RS-485 gateway. Use Value: 2.4–3.6 V operation with 5 V-tolerant pins allows direct connection to 24 V AC rectified signals via resistive dividers; 4 kB Flash stores >10,000 event records. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 8-bit microcontroller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| P89LPC922FDH | 8 kB Flash, same TSSOP20 package and peripheral set - no change in pinout, clocking, or I/O behavior. | Required where firmware size exceeds 4 kB or future code expansion is anticipated without PCB redesign. | Select when long-term firmware growth or field-upgrade capability demands additional non-volatile storage beyond 4 kB. |
| NXP LPC935FDH | Successor device with identical pinout, enhanced debug interface (ISP via UART), and extended temperature range (−40 °C to +105 °C). | Suitable for new designs requiring extended thermal qualification or simplified in-system programming workflow. | Choose for new production where lifecycle assurance, debug efficiency, or wider ambient operation is critical - not drop-in for legacy P89LPC921FDH,518 designs. |
Compared with P89LPC921FDH,518, P89LPC922FDH offers double Flash capacity with zero hardware change, while LPC935FDH delivers modern toolchain support and thermal margin at the cost of minor firmware adaptation for debug features.
Availability
P89LPC921FDH,518 is available at Aetrix Electronics and suitable for industrial sensor nodes, smart meter interfaces, embedded HVAC controllers, and legacy equipment retrofit modules requiring stable component supply and long-term obsolescence management.
Supply support for P89LPC921FDH,518 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 acquired Philips Semiconductors in 2006 and continues development and support of the LPC900 family - a portfolio focused on cost-sensitive, low-power 8-bit microcontroller solutions for industrial and consumer edge devices.
The P89LPC921FDH,518 belongs to the LPC900 series designed specifically for high-integration embedded control applications where Flash density, power efficiency, and peripheral flexibility outweigh raw processing throughput - targeting sensor hubs, metering, and appliance subsystems.
FAQ
What is the Flash memory capacity of the P89LPC921FDH,518?
The P89LPC921FDH,518 integrates 4 kB of on-chip Flash memory organized in 1 kB erasable sectors and 64-byte erasable pages. This capacity supports moderate firmware complexity, including protocol stacks and calibration data, and enables in-application programming (IAP) for field updates without removing the device from the circuit.
Does the P89LPC921FDH,518 support 5 V logic interfaces?
Yes, the P89LPC921FDH,518 features 5 V-tolerant I/O pins - all port pins may be pulled up to or driven by 5.5 V signals while operating from a 2.4–3.6 V supply. This eliminates level-shifting components when interfacing with legacy 5 V peripherals such as sensors, displays, or industrial I/O modules.
Can the P89LPC921FDH,518 operate without an external crystal?
Yes, the P89LPC921FDH,518 includes a factory-calibrated internal RC oscillator running at 7.373 MHz ±1%, enabling full functionality without external timing components. The oscillator frequency is adjustable via the 6-bit TRIM register, and the device supports multiple clock sources including watchdog oscillator (400 kHz) and external clock input.
What power-saving modes does the P89LPC921FDH,518 offer?
The P89LPC921FDH,518 provides Idle mode and two distinct Power-down modes. In Power-down mode with voltage comparators disabled, typical current consumption is 1 µA. Wake-up is triggered by external interrupts, RTC alarm, or port input pattern match - enabling ultra-low-power operation in battery-powered endpoints.
Is the P89LPC921FDH,518 pin-compatible with other members of the LPC92x family?
Yes, the P89LPC921FDH,518 shares identical TSSOP20 pinout and electrical characteristics with P89LPC920FDH and P89LPC922FDH. All three variants use the same SOT360-1 package, pin assignments, and peripheral mappings - allowing hardware design reuse across 2 kB, 4 kB, and 8 kB Flash configurations.
P89LPC921FDH,518 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Package/Case:
- 20-TSSOP (0.173", 4.40mm Width)
- Series:
- LPC900
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Core Processor:
- 8051
- Core Size:
- 8-Bit
- Speed:
- 18MHz
- Connectivity:
- I2C, UART/USART
- Peripherals:
- Brown-out Detect/Reset, LED, POR, PWM, WDT
- Number of I/O:
- 18
- Program Memory Size:
- 4KB (4K x 8)
- Program Memory Type:
- FLASH
- EEPROM Size:
- -
- RAM Size:
- 256 x 8
- Voltage - Supply (Vcc/Vdd):
- 2.4V ~ 3.6V
- Data Converters:
- -
- Oscillator Type:
- Internal
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
P89LPC921FDH,518 FAQ
1.How can I place an order for P89LPC921FDH,518 through Aetrix?
Please submit a Request for Quotation (RFQ) for P89LPC921FDH,518 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 P89LPC921FDH,518 reliable?
The price and inventory of P89LPC921FDH,518 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for P89LPC921FDH,518 is usually 5 days.
3.What payment methods are accepted for P89LPC921FDH,518?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for P89LPC921FDH,518 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for P89LPC921FDH,518?
P89LPC921FDH,518 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your P89LPC921FDH,518 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 P89LPC921FDH,518?
For technical support, including P89LPC921FDH,518 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your P89LPC921FDH,518 requirements.
6.How does Aetrix verify that P89LPC921FDH,518 is sourced from the original manufacturer or authorized distributors?
All P89LPC921FDH,518 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 P89LPC921FDH,518 meets industry standards.
7.What is the process for return or replacement of P89LPC921FDH,518?
All P89LPC921FDH,518 units undergo pre-shipment inspection (PSI). If there is an issue with P89LPC921FDH,518, 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 P89LPC921FDH,518 part is unused and in its original packaging.
Return procedure for P89LPC921FDH,518:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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