NXP Semiconductors P87LPC762BN,112

Overview

P87LPC762BN,112 from NXP Semiconductors (formerly Philips) is a 20-pin, low-power, OTP-based 80C51-compatible microcontroller with 2 kbyte on-chip EPROM, 128 byte RAM, dual 16-bit timers, two analog comparators, full-duplex UART, and I²C interface - designed for cost-sensitive embedded control in industrial sensors and appliance panels.

For engineers reviewing the P87LPC762BN,112 datasheet, P87LPC762BN,112 pinout, P87LPC762BN,112 application, or P87LPC762BN,112 equivalent, key selection criteria include its 2.7–6.0 V operating range, programmable port configurations (quasi-bidirectional/open-drain/push-pull), on-chip RC oscillator option eliminating external crystals, and 1 µA typical Power Down current.

Technical Context

The P87LPC762BN,112 implements an accelerated 80C51 core executing instructions in 300–600 ns at 20 MHz (VDD = 4.5–6.0 V) or 10 MHz (VDD = 2.7–6.0 V), with 6-clock-cycle machine cycles. Its memory map includes 2 kbyte OTP code space, 32-byte customer code area, and 128 byte RAM - no external memory interface support.

It integrates dual analog comparators with selectable reference (CMPREF), independent configuration registers (CMP1#/CMP2#), comparator interrupt capability, and configurable port inputs with Schmitt triggers. The I²C peripheral supports master/slave operation via dedicated SDA/SCL pins with open-drain output enforcement per specification.

Key Specifications

Pinout & Package

Package: 20-pin Plastic Dual In-Line Package (DIP), SOT146–1 footprint, 2.54 mm pitch, through-hole mounting.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AT89LP2052-20PU and STC11F02E-35I-PDIP20, the P87LPC762BN,112 uniquely combines OTP security, dual comparators with shared reference, and hardware I²C in a 20-pin DIP - making it optimal for fixed-function, cost-sensitive sensing nodes where external component count must be minimized.

Availability

P87LPC762BN,112 is available at Aetrix Electronics and suitable for industrial sensor interfaces, home appliance control panels, smart meter front-ends, and low-cost IoT edge nodes requiring stable component supply across extended product lifecycles.

Supply support for P87LPC762BN,112 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' semiconductor division, specializing in secure connectivity solutions for automotive, industrial, and IoT markets.

The P87LPC762BN,112 belongs to NXP's legacy LPC700 family of low-pin-count 80C51 derivatives, engineered for high integration and minimal external components in cost-driven embedded control applications.

FAQ

What is the maximum operating frequency of the P87LPC762BN,112 and under what voltage conditions?

The P87LPC762BN,112 operates at up to 20 MHz when VDD is 4.5–6.0 V, and up to 10 MHz when VDD is 2.7–6.0 V. This dual-speed capability allows flexible power/performance trade-offs - for example, running at 10 MHz on 3 V batteries extends runtime while maintaining sufficient throughput for sensor polling and UART communication. The P87LPC762BN,112 achieves this via an accelerated 80C51 core with 6-clock-cycle machine cycles.

Does the P87LPC762BN,112 support in-system programming, and what memory protection features does it offer?

Yes, the P87LPC762BN,112 supports serial EPROM programming for in-circuit production coding. It includes two EPROM security bits that prevent reading of the 2 kbyte OTP code memory, protecting proprietary firmware from reverse engineering. These bits are one-time programmable and irreversible - once set, they permanently disable code readback. The P87LPC762BN,112 also reserves 32 bytes of customer code space for serialization or calibration data, accessible via MOVC instructions.

How many I/O pins are available on the P87LPC762BN,112, and what output configurations do they support?

The P87LPC762BN,112 provides a minimum of 15 configurable I/O pins (P0.0–P0.7, P1.0–P1.7, P2.0–P2.1), expandable to 18 when using on-chip oscillator and reset options. Each pin supports quasi-bidirectional, open-drain, push-pull, or input-only modes via dedicated SFRs (P0M1#/P0M2#, P1M1#/P1M2#). This eliminates need for external pull-ups on I²C lines and enables direct 20 mA LED drive - all configurable per-pin without hardware changes. The P87LPC762BN,112's port flexibility reduces external logic in space-constrained designs.

What analog functions are integrated into the P87LPC762BN,112, and how are they configured?

The P87LPC762BN,112 integrates two independent analog comparators (CMP1 and CMP2) with dedicated control registers (CMP1#, CMP2#), positive inputs (CIN1A/CIN1B, CIN2A/CIN2B), and a shared negative reference input (CMPREF). CMPREF can accept an internal bandgap voltage or external reference. Comparator outputs (CMP1, CMP2) feed directly into interrupt logic, enabling wake-from-Power-Down on threshold crossing. Configuration is done via SFR bits - no external op-amps or resistors required. The P87LPC762BN,112 thus delivers precision analog monitoring within a compact 20-pin package.

What power management features does the P87LPC762BN,112 provide for battery-operated devices?

The P87LPC762BN,112 offers Idle and Power Down modes, with typical Power Down current of 1 µA - ideal for battery-powered applications requiring long sleep intervals. Wake-up is triggered by any enabled interrupt source, including external pins (INT0/INT1), keypad inputs (P0.x), or comparator events. It also includes brownout detection (selectable 2.5 V or 3.5 V trip) and power-on reset, both implemented entirely on-chip. These features allow the P87LPC762BN,112 to operate autonomously across 2.7–6.0 V without external supervisors or reset ICs.