NXP Semiconductors P87LPC767BD,512

Overview

P87LPC767BD,512 from NXP Semiconductors (formerly Philips) is a 20-pin, low-power, OTP-based 80C51-compatible microcontroller with integrated 4-kbyte EPROM, 128-byte RAM, four-channel 8-bit A/D converter, dual analog comparators, I²C and UART interfaces, and programmable port configurations. It operates from 2.7 V to 6.0 V and supports RC or crystal oscillator options - ideal for cost-sensitive industrial sensor nodes and embedded control modules requiring minimal external components.

For engineers reviewing the P87LPC767BD,512 datasheet, P87LPC767BD,512 pinout, P87LPC767BD,512 application, or P87LPC767BD,512 equivalent, key selection criteria include its 20-pin SO package, on-chip watchdog timer with selectable timeout, 9.3 µs A/D conversion time at 20 MHz, quasi-bidirectional/open-drain/push-pull I/O configuration flexibility, and support for keypad interrupt inputs across Port 0.

Technical Context

The P87LPC767BD,512 implements an accelerated 80C51 core executing instructions in 300–600 ns at 20 MHz (VDD = 4.5–6.0 V), with dual 16-bit timers, full-duplex UART, and I²C master/slave capability. Its analog subsystem includes two independent comparators with configurable reference and four multiplexed A/D input channels (AD0–AD3) sharing pins with comparator inputs and CINx signals.

Power management features include Idle and Power Down modes, with typical Power Down current of 1 µA and wake-up via low-level interrupt on any of 15 configurable I/O pins. Oscillator options include on-chip RC (no external components), crystal/resonator (X1/X2), or external clock input - all selected via user-programmable EPROM configuration bits.

Key Specifications

Pinout & Package

Package: SO20 (plastic small outline, 20 leads, 7.5 mm body width, SOT163-1).

Key Features

Applications

Equivalent & Alternatives

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

Compared with AT89LP2052-20PU and STM8S003F3P6, the P87LPC767BD,512 uniquely integrates four A/D channels, dual comparators, and I²C in a 20-pin SO package with 2.7 V minimum operation - making it optimal for ultra-low-cost, analog-rich embedded systems where external component count must be minimized.

Availability

P87LPC767BD,512 is available at Aetrix Electronics and suitable for industrial sensor nodes, smart appliance control, energy meter interfaces, and low-cost HVAC thermostats requiring stable component supply and long-term manufacturability.

Supply support for P87LPC767BD,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 is a global semiconductor company formed from the spin-off of Philips Semiconductors in 2006, specializing in secure connectivity solutions for automotive, industrial, and IoT markets.

The P87LPC767BD,512 belongs to NXP's legacy LPC700 family - designed specifically for cost-sensitive, low-pin-count embedded control applications where integration of analog functions, programmable I/O, and ultra-low power consumption are essential.

FAQ

What is the maximum operating frequency of the P87LPC767BD,512 and under what voltage conditions?

The P87LPC767BD,512 operates at up to 20 MHz when VDD is between 4.5 V and 6.0 V, and up to 10 MHz when VDD is between 2.7 V and 6.0 V. This dual-speed specification allows designers to optimize performance versus power consumption based on system supply constraints - for example, running at 10 MHz from a 3.3 V rail in battery-powered applications while maintaining full peripheral functionality including the 8-bit A/D converter and UART.

Does the P87LPC767BD,512 support in-circuit programming, and what security features protect firmware?

Yes, the P87LPC767BD,512 supports serial EPROM programming for simple in-circuit production coding. It includes two EPROM security bits that permanently prevent reading of the 4-kbyte code memory after programming - protecting proprietary algorithms and calibration data. Additionally, the 32-byte customer code space can store unique device identifiers or factory-set parameters without exposing them to standard read operations.

How many analog input channels does the P87LPC767BD,512 A/D converter support, and which pins are used?

The P87LPC767BD,512 integrates a four-channel 8-bit A/D converter using Port 0 pins: AD0 on P0.3/CIN1B, AD1 on P0.4/CIN1A, AD2 on P0.5/CMPREF, and AD3 on P0.6/CMP1. These channels are multiplexed with analog comparator inputs and outputs, enabling simultaneous analog monitoring and threshold detection - for instance, using AD2 as a reference voltage monitor while AD0–AD1 sample external sensors.

Can the P87LPC767BD,512 operate without external passive components for clocking and reset?

Yes, the P87LPC767BD,512 can operate with zero external passive components by selecting the on-chip RC oscillator option and enabling the internal power-on reset circuit. When configured this way, only VDD and VSS connections are required - significantly reducing bill-of-materials cost and PCB footprint. The RC oscillator is user-programmable via EPROM bits and provides sufficient accuracy for non-timing-critical applications such as sensor polling and UI control.

What I/O drive configurations are supported on the P87LPC767BD,512, and how are they controlled?

The P87LPC767BD,512 supports quasi-bidirectional, open-drain, push-pull, and input-only configurations on all Port 0 and Port 1 pins - controlled independently via dedicated SFRs (P0M1#, P0M2#, P1M1#, P1M2#). For example, P1.2 (SCL) defaults to open-drain for I²C compliance, while P0.7 (T1) can be set to push-pull for active timer overflow signaling. This eliminates external pull-ups or buffer ICs in many interface scenarios.