NXP Semiconductors P89LPC9331FDH,512

Overview

P89LPC9331FDH,512 from NXP Semiconductors is a low-cost 8-bit microcontroller based on an accelerated two-clock 80C51 core delivering six times the instruction throughput of standard 80C51 at same frequency, featuring 4 kB flash code memory, 256-byte RAM, dual 8-bit ADCs with temperature sensor integration, and 23 I/O pins in TSSOP28 package - deployed in industrial sensor nodes and embedded control systems requiring compact footprint and low-voltage operation.

For engineers reviewing the P89LPC9331FDH,512 datasheet, P89LPC9331FDH,512 pinout, P89LPC9331FDH,512 application, or P89LPC9331FDH,512 equivalent, key selection criteria include its 2.4–3.6 V operating range, 5 V-tolerant I/Os, on-chip RC oscillator with clock doubler, and support for In-System Programming (ISP) and In-Application Programming (IAP) without external hardware.

Technical Context

The P89LPC9331FDH,512 implements a high-efficiency 80C51 derivative CPU executing instructions in 2–4 clocks, enabling 111–222 ns cycle times at 18 MHz. Its integrated peripherals include a fractional baud rate UART, 400 kHz I²C-bus port, SPI interface, and dual 8-bit ADCs with dedicated analog comparators and reference inputs - all sharing a unified 23-bit system timer used as real-time clock.

Power management includes three reduced-power modes (Idle, Power-down, Total Power-down), brownout detection, and a separate 400 kHz watchdog oscillator calibrated to ±5%. Port configuration is fully programmable per pin (quasi-bidirectional, open-drain, push-pull, input-only), with Schmitt-trigger inputs and controlled slew-rate outputs to minimize EMI.

Key Specifications

Pinout & Package

Package: Plastic thin shrink small outline package; 28 leads; body width 4.4 mm (SOT361-1).

Key Features

Applications

Equivalent & Alternatives

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

Compared with P89LPC9331FDH,512, P89LPC9341FDH offers double flash capacity in identical TSSOP28 packaging, while EFM8BB10F8G-A-QFN20 trades analog integration for smaller footprint and lower power - making P89LPC9331FDH,512 optimal for cost-sensitive, analog-rich 8-bit control where flash headroom is sufficient.

Availability

P89LPC9331FDH,512 is available at Aetrix Electronics and suitable for industrial sensor nodes, smart meter interfaces, embedded keypad controllers, and low-power remote terminals requiring stable component supply across extended temperature ranges (−40 °C to +85 °C).

Supply support for P89LPC9331FDH,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 headquartered in Eindhoven, Netherlands, specializing in secure connectivity solutions for automotive, industrial, and IoT applications.

The P89LPC93xx family was designed as a cost-optimized, highly integrated 8-bit microcontroller platform targeting resource-constrained embedded systems requiring analog sensing, low-voltage operation, and field-upgradable firmware.

FAQ

What is the maximum operating frequency of the P89LPC9331FDH,512?

The P89LPC9331FDH,512 supports a maximum operating frequency of 18 MHz, achievable with external crystal/resonator or internal RC oscillator with clock doubler enabled. At this frequency, the accelerated two-clock core delivers instruction cycle times of 111 ns to 222 ns - six times faster than standard 80C51 devices at the same clock rate. The P89LPC9331FDH,512 datasheet confirms full functionality across the 0–18 MHz range under 2.4–3.6 V supply conditions.

Does the P89LPC9331FDH,512 include an on-chip temperature sensor?

Yes, the P89LPC9331FDH,512 integrates an on-chip temperature sensor directly connected to the ADC0 module, allowing direct digitization of die temperature without external components. This sensor is explicitly documented in the functional diagram and analog peripheral description for the P89LPC9331/9341 variant group. The P89LPC9331FDH,512 uses ADC0 channel 0 (AD00) for temperature readout, and calibration data can be stored in its 4 kB flash memory.

Can the P89LPC9331FDH,512 perform In-Application Programming (IAP)?

Yes, the P89LPC9331FDH,512 supports In-Application Programming of its 4 kB flash memory, enabling firmware updates while the device is running in the target system. This capability is implemented via dedicated SFRs (FMCON, FMDATA, FMADRH/L) and requires no external programming hardware. The P89LPC9331FDH,512 user manual specifies that IAP operations preserve RAM contents and allow selective sector/page erasure - critical for safe over-the-air updates in deployed equipment.

What are the I/O voltage tolerance specifications for the P89LPC9331FDH,512?

All I/O pins of the P89LPC9331FDH,512 are 5 V tolerant and may be safely pulled up to or driven by signals up to 5.5 V, even when VDD is operating at the minimum 2.4 V. This specification is confirmed in the "Principal features" section and electrical characteristics table of the official NXP datasheet. The tolerance applies regardless of port configuration mode (quasi-bidirectional, open-drain, etc.), simplifying interface design with legacy 5 V peripherals without level-shifting circuitry.

Is the P89LPC9331FDH,512 pin-compatible with other members of the P89LPC93xx family?

The P89LPC9331FDH,512 is pin-compatible with P89LPC9341FDH in the TSSOP28 package, sharing identical pin functions and physical layout. However, it is not pin-compatible with P89LPC9351/9361 variants due to additional CCU-related pins (OCA, OCD, ICB, etc.) assigned to P2.0–P2.1 and P2.6–P2.7. The P89LPC9331FDH,512 datasheet explicitly defines its pin configuration in Figure 4 and Table 3, confirming compatibility only within the P89LPC9331/9341 subgroup.