NXP Semiconductors P89LPC915HDH,129

Overview

P89LPC915HDH,129 from NXP Semiconductors is a 14-pin TSSOP 8-bit microcontroller based on an accelerated two-clock 80C51 core, delivering six times the instruction throughput of standard 80C51 at 18 MHz. It integrates 2 kB flash code memory (byte-erasable), 256-byte RAM, dual 16-bit timers, a 23-bit system/real-time clock, and a 4-channel 8-bit ADC with two analog comparators - enabling compact, low-cost embedded control in space-constrained industrial sensors.

For engineers reviewing the P89LPC915HDH,129 datasheet, P89LPC915HDH,129 pinout, P89LPC915HDH,129 application, or P89LPC915HDH,129 equivalent, this device supports I²C, UART with fractional baud rate generation, keypad interrupt (6 inputs), LED drive (20 mA per pin), and 5 V-tolerant I/O - all within a −40 °C to +125 °C extended temperature range and 2.4 V–3.6 V supply.

Technical Context

The P89LPC915HDH,129 implements a high-performance 80C51 CPU executing instructions in just two to four clocks, achieving 111–222 ns cycle times at 18 MHz. Its architecture includes dedicated hardware for In-Application Programming (IAP-Lite), enabling flash memory to serve as non-volatile data storage without external EEPROM.

On-chip peripherals include a watchdog timer with independent oscillator and selectable prescaler, brownout detection with interrupt capability, and programmable port configurations (quasi-bidirectional, open-drain, push-pull). All I/O pins feature Schmitt-trigger inputs and controlled slew-rate outputs (~10 ns ramp time) to reduce EMI.

Key Specifications

Pinout & Package

Package: Plastic thin shrink small outline package; 14 leads; body width 4.4 mm (SOT402-1).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 8-bit microcontroller applications.

Compared with P89LPC915FDH, the P89LPC915HDH,129 provides guaranteed operation up to +125 °C without derating, while retaining identical peripheral set and footprint. Against P89LPC917FDH, it removes unused Timer 1 and CLKOUT functionality - reducing test complexity and qualifying cost without sacrificing core control capability.

Availability

P89LPC915HDH,129 is available at Aetrix Electronics and suitable for industrial sensor nodes, automotive cabin controls, and smart meter interfaces requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for P89LPC915HDH,129 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 leader specializing in secure connectivity solutions for automotive, industrial, and IoT markets, with deep expertise in microcontrollers, RF, and analog technologies.

The P89LPC915HDH,129 belongs to NXP's LPC900 family of enhanced 80C51 microcontrollers, designed specifically for cost-sensitive, space-constrained embedded control applications demanding integrated analog peripherals, low power, and robust industrial temperature operation.

FAQ

What is the maximum operating frequency of the P89LPC915HDH,129?

The P89LPC915HDH,129 supports a maximum CPU clock frequency of 18 MHz, achievable via external crystal or the internal RC oscillator. At this frequency, its accelerated two-clock 80C51 core delivers instruction cycle times of 111–222 ns - six times faster than a standard 80C51 running at the same clock rate. The internal RC oscillator is factory-calibrated to ±1 % and fine-tunable for precision timing.

Does the P89LPC915HDH,129 support in-system programming (ISP)?

Yes, the P89LPC915HDH,129 supports Serial Flash In-Circuit Programming (ICP) using commercial EPROM programmers, enabling simple production coding. It also supports In-Application Programming (IAP-Lite), allowing firmware updates and non-volatile data storage directly from running application code - eliminating the need for external EEPROM or reprogramming hardware.

How many analog-to-digital converter channels does the P89LPC915HDH,129 have?

The P89LPC915HDH,129 integrates a 4-input multiplexed 8-bit ADC (ADC1), with analog input channels AD10, AD11, AD12, and AD13 mapped to P0.1, P0.2, P0.3, and P0.4 respectively. This enables simultaneous monitoring of up to four analog sensors - such as thermistors, potentiometers, or current-sense amplifiers - without external multiplexing circuitry.

What is the purpose of the CMPREF pin on the P89LPC915HDH,129?

The CMPREF pin (P0.5) serves as the negative reference input for both analog comparators (CMP1 and CMP2) on the P89LPC915HDH,129. It accepts an external reference voltage or internal bandgap source to establish precise comparison thresholds. This enables window-comparator configurations, overvoltage/undervoltage detection, and analog signal conditioning without external op-amps or voltage dividers.

Can the P89LPC915HDH,129 operate without an external crystal?

Yes, the P89LPC915HDH,129 includes an internal RC oscillator factory-calibrated to ±1 %, which can be selected as the system clock source - eliminating the need for external crystal and load capacitors. This option reduces BOM cost and board space, and supports fine-tuning via special function registers for applications where absolute timing precision is not required.