NXP Semiconductors P87C660X2BBD,157

Overview

P87C660X2BBD from NXP Semiconductors (formerly Philips Semiconductors) is an 8-bit OTP microcontroller based on the 80C51 architecture, featuring 16 KB on-chip OTP memory, 512 B RAM, dual I²C interfaces (one Fast-mode at 400 kbit/s), 32 I/O pins, and operation from 2.7 V to 5.5 V at up to 33 MHz in 12-clock mode - used in industrial motor control and embedded sensor interface systems.

For engineers reviewing the P87C660X2BBD datasheet, P87C660X2BBD pinout, P87C660X2BBD application, or P87C660X2BBD equivalent, key selection considerations include its 44-pin LQFP package, single I²C port (Fast-mode only), programmable 6/12-clock CPU mode, PCA-based PWM capability, and support for low-power idle/power-down modes with external interrupt wake-up.

Technical Context

The P87C660X2BBD implements a static CMOS 80C51-compatible core with full instruction set compatibility and enhanced peripherals including three 16-bit timers (T0, T1, T2), a Programmable Counter Array (PCA) supporting PWM, capture/compare, and high-speed I/O, plus a full-duplex enhanced UART with framing error detection and automatic address recognition.

It integrates two I²C serial ports: one configurable between Fast-mode (400 kbit/s) and Standard-mode (100 kbit/s), and - critically - only the P87C661X2 variant supports a second I²C port; the P87C660X2BBD has exactly one I²C interface (SCL0/SDA0), confirmed by selection table and pin descriptions. Its clock system supports software-selectable 6-clock or 12-clock operation via CKCON.X2 bit, with OTP override capability.

Key Specifications

Pinout & Package

Package: LQFP44 (plastic low-profile quad flat package, 10 × 10 × 1.4 mm, SOT389–1), rated for 0 °C to +70 °C operation.

Key Features

Applications

Equivalent & Alternatives

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

Compared with P87C661X2BBD, the P87C660X2BBD omits the second I²C interface and associated pins, reducing pin count utilization and BOM cost; versus AT89C51RD2-UM, it offers OTP security and guaranteed 80C51 peripheral behavior but lacks in-system reprogrammability.

Availability

P87C660X2BBD is available at Aetrix Electronics and suitable for industrial motor control, sensor interface modules, and legacy equipment upgrades requiring stable component supply, long-term lifecycle support, and verified OTP firmware integrity.

Supply support for P87C660X2BBD 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 delivering high-performance mixed-signal solutions for automotive, industrial, and IoT applications, with deep heritage in 8-bit microcontroller innovation.

The P87C660X2BBD belongs to the P8xC66xX2 family designed specifically for cost-sensitive, low-power embedded control applications demanding robust I²C communication, precise PWM timing, and secure firmware storage in OTP.

FAQ

What is the maximum operating frequency of the P87C660X2BBD at 3.3 V?

The P87C660X2BBD operates up to 16 MHz at 3.3 V in both 6-clock and 12-clock modes, as specified in the Selection Table on page 3 of the 2003 Oct 02 product data sheet. This limit ensures stable timing margins and meets DC electrical characteristics across the 0 °C to +70 °C temperature range for the P87C660X2BBD variant.

Does the P87C660X2BBD support a second I²C interface?

No, the P87C660X2BBD supports only one I²C interface (SCL0/SDA0). The second I²C port (SCL1/SDA1) is exclusive to the P87C661X2 series, as clearly differentiated in the Selection Table, Block Diagram footnote "1. 2nd I2C on P8xC661X2 only", and pin descriptions where SCL1/SDA1 are marked "P8xC661X2 devices only".

How is the 6-clock vs. 12-clock mode selected on the P87C660X2BBD?

The P87C660X2BBD supports both 6-clock and 12-clock operation. Mode selection is controlled by the X2 bit (CKCON.0) and an OTP bit (OX2). When OX2 is erased, X2 determines mode (X2=1 → 6-clock; X2=0 → 12-clock). When OX2 is programmed (via parallel programmer), it forces 6-clock mode regardless of X2 value - confirmed in Clock Control Register section, page 11.

What package type and lead count does the P87C660X2BBD use?

The P87C660X2BBD uses a 44-lead LQFP package (plastic low-profile quad flat package, body size 10 × 10 × 1.4 mm, SOT389–1), rated for 0 °C to +70 °C operation. This is explicitly stated in the Ordering Information table and Pinning section for LQFP configuration, distinguishing it from the PLCC44 variant (P87C660X2FA).

Can the P87C660X2BBD generate PWM signals, and how many channels are available?

Yes, the P87C660X2BBD generates PWM via its Programmable Counter Array (PCA), supporting up to five independent PWM channels (CEX0–CEX4) using PCA modules 0–4. Each channel can be configured for edge-aligned or center-aligned output with programmable period and duty cycle through CCAPMn and CCAPnL/H registers - detailed in Special Function Registers section, pages 9–10.