NXP Semiconductors P87LPC769HD,512

Overview

P87LPC769HD,512 from Philips Semiconductors is a 20-pin, 8-bit accelerated 80C51 microcontroller with 4 kB OTP EPROM, 128-byte RAM, four-channel 8-bit A/D converter (9.3 µs conversion at 20 MHz), two DAC outputs (one shared with A/D), and dual analog comparators - designed for low-cost, low-power embedded control in space-constrained industrial sensor interfaces and LED-driven instrumentation.

For engineers reviewing the P87LPC769HD,512 datasheet, P87LPC769HD,512 pinout, P87LPC769HD,512 application, or P87LPC769HD,512 equivalent, key selection criteria include its integrated RC oscillator option (no external crystal required), programmable port output modes (quasi-bidirectional/open-drain/push-pull), 1 µA Power Down current, I²C and UART interfaces, and on-chip brownout detection with configurable reset behavior.

Technical Context

The P87LPC769HD,512 implements an enhanced 80C51 core executing instructions in 300–600 ns at 20 MHz (VDD = 4.5–5.5 V), with dual 16-bit timers supporting overflow toggle outputs and UART baud rate generation via Timer 1. Its analog subsystem integrates a four-channel multiplexed 8-bit ADC, two independent DAC outputs, and two analog comparators with selectable reference and interrupt capability.

Power management includes Idle and Power Down modes, with wakeup from Power Down triggered by low-level interrupts; the watchdog timer uses a separate on-chip oscillator and offers eight selectable timeout values. Oscillator options include high/medium/low-frequency crystals, resonators, or fully internal RC - all configured via EPROM bits without PCB changes.

Key Specifications

Pinout & Package

Package: 20-pin Plastic Small Outline (SO) package, SOT163–1, –40 °C to +125 °C operating temperature range.

Key Features

Applications

Equivalent & Alternatives

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

Compared with P89LPC922FD,512 and ADuC7024BCPZ-RL7, the P87LPC769HD,512 delivers optimal cost-performance balance for fixed-function, low-pin-count applications requiring dual DACs and minimal external components - especially where OTP security and ultra-low Power Down current are critical.

Availability

P87LPC769HD,512 is available at Aetrix Electronics and suitable for industrial sensor interfaces, LED-based instrumentation, embedded power management, and I²C peripheral controller designs requiring stable component supply across extended temperature ranges.

Supply support for P87LPC769HD,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

Philips Semiconductors (now NXP Semiconductors) is a global semiconductor innovator focused on high-reliability, application-specific ICs for automotive, industrial, and consumer markets.

The P87LPC769HD,512 belongs to the LPC700 family of low-pin-count 80C51 microcontrollers engineered for cost-sensitive, space-constrained embedded control - emphasizing integration of analog peripherals, low-power operation, and simplified system design.

FAQ

What is the maximum operating frequency of the P87LPC769HD,512 and under what voltage conditions?

The P87LPC769HD,512 operates up to 20 MHz when supplied at VDD = 4.5 V to 5.5 V. At 3 V, the maximum rated frequency is 10 MHz. These limits are defined by the DC and AC electrical characteristics in the preliminary datasheet and must be observed to ensure reliable execution timing and analog accuracy. The P87LPC769HD,512's accelerated 80C51 core achieves 300–600 ns instruction cycles within these constraints.

Does the P87LPC769HD,512 support in-circuit programming, and what security features protect the firmware?

Yes, the P87LPC769HD,512 supports serial EPROM programming for in-circuit production coding. It includes two EPROM security bits that prevent reading of the 4 kB OTP code memory, protecting proprietary firmware from unauthorized access. These bits are one-time programmable and permanently lock the device after setting. The P87LPC769HD,512 does not support erase or reprogramming once secured.

How many analog inputs does the P87LPC769HD,512 support, and which pins are assigned to the A/D converter?

The P87LPC769HD,512 supports four analog input channels (AD0–AD3) multiplexed onto Port 0 pins: AD0 on P0.3/CIN1B, AD1 on P0.4/CIN1A, AD2 on P0.5/CMPREF, and AD3 on P0.6/CMP1. Each channel is 8-bit resolution with 9.3 µs conversion time at 20 MHz. The P87LPC769HD,512's ADC shares pins with analog comparators, requiring careful configuration to avoid functional conflict.

Can the P87LPC769HD,512 generate precise analog output signals, and what are the DAC output capabilities?

Yes, the P87LPC769HD,512 provides two independent 8-bit DAC outputs: DAC0 on P1.7 and DAC1 on P1.6. Both outputs are rail-to-rail referenced to VDD and require no external components. One DAC output (DAC0) shares its pin with the A/D converter, so simultaneous use requires time-multiplexing. The P87LPC769HD,512's DACs support closed-loop calibration and analog biasing in sensor conditioning circuits.

What oscillator options are available for the P87LPC769HD,512, and how are they configured?

The P87LPC769HD,512 supports multiple oscillator configurations - high/medium/low-frequency crystal or resonator, internal RC oscillator, or external clock input - all selected via user-programmed EPROM configuration bits (UCFG1/UCFG2). The internal RC option eliminates external timing components entirely, allowing full operation with only VDD and VSS. The P87LPC769HD,512's oscillator fail detect function uses the watchdog timer's independent on-chip oscillator to monitor main clock integrity.