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NXP Semiconductors P89LPC921FDH,512
- Part No.:
- P89LPC921FDH,512
- Manufacturer:
- NXP Semiconductors
- Category:
- Microcontrollers
- Package:
- 20-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
P89LPC921FDH,512.pdf
- Description:
- IC MCU 8BIT 4KB FLASH 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,903
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Product details
Overview
P89LPC921FDH,512 from NXP Semiconductors (formerly Philips) is an 8-bit microcontroller based on a two-clock 80C51 core, delivering six times the instruction throughput of standard 80C51 devices at 18 MHz. It integrates 4 kB Flash code memory, 256-byte RAM, dual 16-bit timers, real-time clock, two analog comparators, and I²C/UART peripherals - enabling compact, low-power embedded control in space-constrained industrial and consumer systems.
For engineers reviewing the P89LPC921FDH,512 datasheet, P89LPC921FDH,512 pinout, P89LPC921FDH,512 application, or P89LPC921FDH,512 equivalent, this device supports in-application Flash programming, 2.4–3.6 V operation with 5 V-tolerant I/O, configurable port modes (quasi-bidirectional/open-drain/push-pull), and brownout reset - critical for robust firmware updates and mixed-voltage interface design.
Technical Context
The P89LPC921FDH,512 executes instructions in two to four CPU clock cycles using a high-performance accelerated 2-clock 80C51 architecture. Its CPU clock (CCLK) is derived from user-selectable sources: factory-calibrated 7.373 MHz ±1% on-chip RC oscillator, external crystal (20 kHz–18 MHz), watchdog oscillator (400 kHz), or external clock input - all configurable via Flash configuration bits.
Peripheral integration includes an enhanced UART with fractional baud rate generator and break detection, 400 kHz I²C-bus port, real-time clock usable as system timer, and two analog comparators with selectable inputs and reference. Port 0 supports keypad interrupt pattern matching, while all ports feature Schmitt-triggered inputs and slew-rate-controlled outputs to reduce EMI.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Core Architecture | Two-clock 80C51 CPU executing most instructions in 2–4 CCLK cycles - enables 111 ns min instruction cycle at 18 MHz, 6× speed vs standard 80C51. |
| Memory | 4 kB Flash (1 kB erasable sectors, 64-byte pages) + 256-byte RAM - supports in-application reprogramming and secure code protection. |
| Operating Voltage | 2.4 V to 3.6 V VDD with 5.5 V-tolerant I/O pins - allows direct interfacing to 5 V logic without level shifters. |
| Timers & Clocks | Two 16-bit counter/timers (T0/T1), real-time clock/system timer, and programmable on-chip RC oscillator (7.373 MHz ±1%) - eliminates need for external crystal in cost-sensitive designs. |
| Peripherals | Enhanced UART (fractional baud, break detect, auto-address), 400 kHz I²C, two analog comparators, watchdog timer with independent 400 kHz oscillator - reduces BOM count for sensor monitoring and communication subsystems. |
| Power Management | Idle and two Power-down modes; typical Power-down current = 1 µA (with comparators disabled) - extends battery life in portable and remote sensing applications. |
Pinout & Package
TSSOP20 package (SOT360-1), 4.4 mm body width, 20-pin surface-mount outline requiring no external reset or oscillator components when internal options are selected.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| P0.0 / KBI0 / CMP2 | Port 0 bit 0 / Keypad interrupt 0 / Comparator 2 output | Configurable I/O with Schmitt trigger; enables wake-up on keypress or analog threshold crossing. |
| P1.0 / TXD | Port 1 bit 0 / UART transmit output | Push-pull or open-drain configurable; drives RS-232/RS-485 transceivers directly in half-duplex mode. |
| P1.1 / RXD | Port 1 bit 1 / UART receive input | Schmitt-triggered input tolerant to 5.5 V - accepts TTL/CMOS logic levels across voltage domains. |
| P1.2 / T0 / SCL | Port 1 bit 2 / Timer 0 input / I²C clock | Open-drain output when used as SCL - meets I²C bus electrical requirements without external pull-ups in some configurations. |
| P1.3 / INT0 / SDA | Port 1 bit 3 / External interrupt 0 / I²C data | Open-drain output; supports multi-master I²C arbitration and hardware interrupt triggering from sensors. |
| P1.5 / RST | Port 1 bit 5 / Reset input (configurable) | Active-LOW reset input enabled via Flash bit; required for >12 MHz operation to ensure reliable power-on sequencing. |
| P3.0 / CLKOUT / XTAL2 | Port 3 bit 0 / Clock output / Crystal oscillator output | Provides CCLK/2 clock signal to synchronize external logic when crystal is not used - simplifies timing-critical peripheral interfacing. |
| P3.1 / XTAL1 | Port 3 bit 1 / Crystal oscillator input | Accepts 20 kHz–18 MHz crystal or resonator; functions as general-purpose I/O if internal RC oscillator is selected. |
Key Features
| Feature | Design Value |
|---|---|
| In-Application Programming (IAP) | Enables field firmware updates without removing the MCU - critical for remote device maintenance and security patching. |
| Configurable Port Output Modes | Each pin independently set to quasi-bidirectional, open-drain, push-pull, or input-only - eliminates need for external buffers or level translators in mixed-signal designs. |
| Port Input Pattern Match Detection | Port 0 generates interrupt when pin states match or differ from a programmable 8-bit pattern - reduces CPU polling overhead in keypad or switch matrix interfaces. |
| Controlled Slew Rate Outputs | ~10 ns minimum ramp time on all port outputs - suppresses EMI during high-speed switching in noise-sensitive environments like medical or automotive electronics. |
| Four Interrupt Priority Levels | Allows deterministic response to time-critical events (e.g., comparator triggers, UART framing errors) while servicing lower-priority background tasks. |
Applications
| Industrial Sensor Node | Smart Home Controller |
|---|---|
Use Scenario: Compact, battery-powered temperature/humidity monitor with local display and wireless uplink. IC Role / Device Role / Timing Role: Main system controller managing ADC sampling, LCD drive, I²C sensor interface, and UART-based RF module control. Use Value: 1 µA Power-down current extends 10-year battery life; 400 kHz I²C supports multiple sensors on single bus; 5 V-tolerant I/O interfaces directly with legacy displays. |
Use Scenario: Wall-mounted HVAC thermostat with keypad, LED indicators, and relay drivers. IC Role / Device Role / Timing Role: Real-time clock maintains scheduling; analog comparators monitor thermistor voltage; keypad interrupt detects button presses. Use Value: On-chip RC oscillator eliminates crystal BOM cost; port pattern match reduces firmware polling; 20 mA LED drive capability powers indicators without external drivers. |
| POS Terminal Peripheral | Legacy Equipment Retrofit |
Use Scenario: Barcode scanner add-on module communicating with host via UART and controlling motorized scan head. IC Role / Device Role / Timing Role: Dedicated scan engine controller handling motor timing, photodiode signal conditioning, and serial protocol translation. Use Value: Dual 16-bit timers generate precise PWM for stepper motor control; enhanced UART handles variable-length barcode protocols; Flash security prevents firmware extraction. |
Use Scenario: Drop-in replacement for obsolete 8051-based control board in industrial PLC I/O module. IC Role / Device Role / Timing Role: Pin-compatible upgrade providing higher throughput, lower power, and integrated peripherals to replace discrete oscillator, reset, and interface ICs. Use Value: Same TSSOP20 footprint and 80C51 instruction set ensures zero PCB change; brownout reset replaces external supervisor IC; I²C replaces parallel control buses. |
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 (vs 4 kB), same TSSOP20 package and peripheral set - no pinout or timing changes. | Required when firmware exceeds 4 kB or future expansion headroom is needed without layout revision. | Select P89LPC922FDH if code size growth is anticipated; identical toolchain and debug infrastructure apply. |
| AT89LP51RD2-20PU | 8 kB Flash, 5 V operation only, no on-chip RC oscillator, no analog comparators, 20 MHz max clock - DIP20 package. | Suitable for 5 V legacy systems where analog sensing or ultra-low-power sleep is not required. | Choose AT89LP51RD2-20PU only for 5 V-only designs needing higher clock speed but accepting larger package and missing analog features. |
Compared with P89LPC921FDH,512, P89LPC922FDH offers double Flash capacity with identical footprint and peripherals, while AT89LP51RD2-20PU trades low-voltage operation, analog functions, and integrated oscillator for higher clock speed and 5 V compatibility - making P89LPC921FDH,512 optimal for cost-sensitive, battery-powered, mixed-voltage embedded control.
Availability
P89LPC921FDH,512 is available at Aetrix Electronics and suitable for industrial sensor nodes, smart home controllers, POS terminal peripherals, and legacy equipment retrofits requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for P89LPC921FDH,512 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 of the LPC900 family as part of its legacy 8-bit MCU portfolio targeting cost-sensitive, low-power embedded control.
The P89LPC921FDH,512 belongs to the LPC900 series designed specifically for applications demanding high integration, minimal external components, and robust operation across industrial temperature ranges (−40 °C to +85 °C).
FAQ
What is the maximum operating frequency of the P89LPC921FDH,512?
The P89LPC921FDH,512 supports a maximum operating frequency of 18 MHz when using the high-speed oscillator option with an external crystal or resonator. At this frequency, its two-clock architecture delivers instruction cycle times as fast as 111 ns - six times the performance of a standard 80C51 running at the same clock rate. The on-chip RC oscillator is factory calibrated to 7.373 MHz ±1%.
Does the P89LPC921FDH,512 support in-system programming?
Yes, the P89LPC921FDH,512 supports both in-system programming (ISP) via UART and in-application programming (IAP). ISP allows Flash memory to be programmed while the device is soldered onto the target board using standard serial communication. IAP enables firmware updates during normal operation - essential for remote field upgrades and secure over-the-air patches without halting system functionality.
What are the power supply requirements for the P89LPC921FDH,512?
The P89LPC921FDH,512 operates from a single 2.4 V to 3.6 V supply (VDD), with ground referenced to VSS. All I/O pins are 5.5 V-tolerant, allowing safe interfacing with 5 V logic without external level-shifting circuitry. The device includes a low-voltage reset (brownout detect) circuit that can optionally generate an interrupt, ensuring graceful shutdown during power failure.
How many I/O pins does the P89LPC921FDH,512 provide?
The P89LPC921FDH,512 provides 15 dedicated I/O pins minimum, expanding to 18 I/O pins when using on-chip oscillator and reset options. Port 0 (P0.0–P0.7) and Port 1 (P1.0–P1.7) are fully configurable, while Port 3 offers two additional I/O pins (P3.0, P3.1). Each pin supports multiple modes - quasi-bidirectional, open-drain, push-pull, or input-only - configured independently via SFR registers.
Is the P89LPC921FDH,512 pin-compatible with other members of the LPC92x family?
Yes, the P89LPC921FDH,512 is pin-compatible with P89LPC920FDH, P89LPC922FDH, and P89LPC9221FDH in the TSSOP20 package (SOT360-1). All share identical pin assignments, electrical characteristics, and peripheral mappings. Differences lie in Flash size (2/4/8 kB), drive strength (P89LPC9221FDH only supports 20 mA on eight pins), and minor feature sets - enabling scalable design reuse across product variants.
P89LPC921FDH,512 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Package/Case:
- 20-TSSOP (0.173", 4.40mm Width)
- Series:
- LPC900
- Packaging:
- Tube
- Product Status:
- Obsolete
- Programmable:
- 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,512 FAQ
1.How can I place an order for P89LPC921FDH,512 through Aetrix?
Please submit a Request for Quotation (RFQ) for P89LPC921FDH,512 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,512 reliable?
The price and inventory of P89LPC921FDH,512 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for P89LPC921FDH,512 is usually 5 days.
3.What payment methods are accepted for P89LPC921FDH,512?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for P89LPC921FDH,512 transactions.
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4.How is shipping managed for P89LPC921FDH,512?
P89LPC921FDH,512 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your P89LPC921FDH,512 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,512?
For technical support, including P89LPC921FDH,512 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your P89LPC921FDH,512 requirements.
6.How does Aetrix verify that P89LPC921FDH,512 is sourced from the original manufacturer or authorized distributors?
All P89LPC921FDH,512 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,512 meets industry standards.
7.What is the process for return or replacement of P89LPC921FDH,512?
All P89LPC921FDH,512 units undergo pre-shipment inspection (PSI). If there is an issue with P89LPC921FDH,512, 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,512 part is unused and in its original packaging.
Return procedure for P89LPC921FDH,512:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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