NXP Semiconductors P89LPC938FHN,151

Overview

P89LPC938FHN,151 from NXP Semiconductors (formerly Philips) is an 8-bit accelerated two-clock 80C51 microcontroller in HVQFN28 package, featuring 8 kB byte-erasable Flash, 10-bit ADC with 8 inputs, dual 16-bit timers, and 23-bit system timer/RTC. It operates from 2.4 V to 3.6 V with 5 V-tolerant I/Os and supports keypad interrupt, analog comparators, and multiple serial interfaces (UART, I²C, SPI). Used in compact industrial control modules requiring integrated analog sensing and low-power operation.

For engineers reviewing the P89LPC938FHN,151 datasheet, P89LPC938FHN,151 pinout, P89LPC938FHN,151 application, or P89LPC938FHN,151 equivalent, key selection criteria include its HVQFN28 thermal-enhanced package, on-chip 512-byte Data EEPROM for device serialization, fractional baud rate UART, and configurable port output modes (quasi-bidirectional, open-drain, push-pull) enabling direct LED drive and EMI-controlled slew rates.

Technical Context

The P89LPC938FHN,151 implements a high-performance 80C51 core executing instructions in 2–4 clocks-six times faster than standard 80C51 at same frequency-enabling 111–222 ns instruction cycles at 18 MHz. Its architecture integrates a Capture/Compare Unit (CCU) supporting PWM generation, input capture, and output compare across four channels (OCA–OCD, ICA–ICB), plus dual analog comparators with selectable reference and inputs.

It features a programmable on-chip oscillator (20 kHz–18 MHz), separate watchdog oscillator for fail-detect capability, and power management with idle mode and two power-down modes (typical 1 µA total current with comparators disabled). The 23-bit system timer serves as RTC when configured with external crystal via XTAL1/XTAL2.

Key Specifications

Pinout & Package

HVQFN28 package (SOT788-1) with 28 terminals, 6 × 6 × 0.85 mm body, no leads, and thermal pad for enhanced thermal performance in compact PCB layouts.

Key Features

Applications

Equivalent & Alternatives

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

Compared with P89LPC938FHN,151, the LPC935FHN offers lower memory and fewer analog resources at reduced cost, while the PIC16F18877 provides greater processing headroom and flexible peripherals but demands architectural rework and lacks direct 80C51 code compatibility.

Availability

P89LPC938FHN,151 is available at Aetrix Electronics and suitable for industrial sensor nodes, smart meter interface modules, low-power keypad terminals, and embedded power supply monitors requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for P89LPC938FHN,151 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 focused on secure connectivity solutions for automotive, industrial, and IoT applications, with heritage in Philips' semiconductor division.

The P89LPC938FHN,151 belongs to NXP's LPC900 family of 8-bit microcontrollers designed for cost-sensitive, space-constrained embedded systems requiring high integration, low power, and robust analog/mixed-signal capabilities.

FAQ

What is the maximum operating frequency of the P89LPC938FHN,151?

The P89LPC938FHN,151 supports a maximum operating frequency of 18 MHz, achievable with external crystal/resonator or internal RC oscillator. At this frequency, its accelerated 2-clock 80C51 core delivers instruction cycle times of 111–222 ns-six times faster than standard 80C51 devices. The configurable oscillator divider allows lower frequencies for power optimization without changing hardware.

Does the P89LPC938FHN,151 support in-system programming (ISP)?

Yes, the P89LPC938FHN,151 supports Serial Flash ISP, allowing firmware programming while the device is mounted in the end application via UART, I²C, or SPI. This eliminates the need for socketed programming and enables field updates. ISP requires only VDD, GND, and one serial interface-no special high-voltage signals are needed.

How many analog input channels does the P89LPC938FHN,151 ADC support?

The P89LPC938FHN,151 integrates an 8-input, 10-bit successive-approximation ADC (ADC0) with channels AD00 through AD07 mapped to P0.1, P0.2, P0.3, P0.4, P0.0, P1.7, P2.1, and P2.0 respectively. Channel selection is software-controlled via AD0INS register, and conversion can be triggered by timer, external event, or software command.

What are the power supply requirements for the P89LPC938FHN,151?

The P89LPC938FHN,151 operates from a single 2.4 V to 3.6 V supply (VDD), with VSS as ground reference. All I/O pins are 5 V tolerant-capable of being pulled up to or driven by 5.5 V logic-enabling interoperability with legacy 5 V systems without level shifters. Internal power-on reset and brownout detection eliminate external reset components.

Can the P89LPC938FHN,151 generate PWM signals?

Yes, the P89LPC938FHN,151 generates PWM via its Capture/Compare Unit (CCU), which provides four independent output compare channels (OCA–OCD). Each channel supports programmable duty cycle and frequency; OCA and OCB can be configured as complementary PWM pairs with dead-time insertion. PWM resolution is determined by 16-bit timer base and prescaler settings.