NXP Semiconductors P89LPC933HDH,512

Overview

P89LPC933HDH from NXP Semiconductors is an 8-bit microcontroller based on an accelerated two-clock 80C51 core, delivering six times the instruction throughput of standard 80C51 at same clock frequency. It integrates 4 kB flash code memory, 256-byte RAM, single 8-bit ADC (ADC0), UART with fractional baud rate generator, I²C and SPI interfaces, and operates from 2.4 V to 3.6 V with 5 V-tolerant I/O pins - used in industrial sensor nodes requiring compact, low-power embedded control.

For engineers reviewing the P89LPC933HDH datasheet, P89LPC933HDH pinout, P89LPC933HDH application, or P89LPC933HDH equivalent, key selection criteria include its TSSOP28 package, −40 °C to +125 °C temperature grade, absence of CCU/auxiliary RAM/second ADC, and compatibility with legacy 8051 toolchains while enabling reduced BOM count via on-chip oscillator and reset.

Technical Context

The P89LPC933HDH executes instructions in two to four clocks using a high-performance 80C51-derived CPU architecture, achieving 111–222 ns instruction cycle times at 18 MHz. Its system-level integration includes a configurable on-chip RC oscillator (20 kHz–18 MHz), watchdog timer with independent oscillator, and power management features including idle mode and two power-down modes with typical 1 μA total current.

It supports In-System Programming (ISP) and In-Application Programming (IAP) of flash memory, with serial flash ICP capability for production coding. The device implements a 23-bit system timer usable as RTC, dual 16-bit counter/timers (configurable as PWM or port toggle), and programmable port output modes (quasi-bidirectional, open-drain, push-pull, input-only) across all I/O pins.

Key Specifications

Pinout & Package

Package: Plastic thin shrink small outline package (TSSOP28), 28 leads, body width 4.4 mm (SOT361-1). Pinout validated per Figure 2 (P89LPC933/934 TSSOP28 configuration) and Table 4 (Pin description).

Key Features

Applications

Equivalent & Alternatives

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

Compared with P89LPC934FDH, the P89LPC933HDH trades flash capacity and temp grade for extended industrial operation; versus EFM8BB10F4G-A-QFN24, it retains full I²C/SPI/UART compatibility and pin-for-pin replaceability within the LPC93x family but lacks 12-bit ADC capability.

Availability

P89LPC933HDH is available at Aetrix Electronics and suitable for industrial sensor nodes, smart meter interfaces, and embedded HVAC controllers requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for P89LPC933HDH 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 markets.

The P89LPC93x series was designed as a cost-optimized, highly integrated 8-bit microcontroller family targeting resource-constrained industrial control and sensor interface applications with minimal external components.

FAQ

What is the maximum operating frequency of the P89LPC933HDH?

The P89LPC933HDH supports a maximum operating frequency of 18 MHz, achievable using either the internal RC oscillator (fine-tunable) or an external crystal/resonator connected to XTAL1/XTAL2. At 18 MHz, instruction cycle times range from 111 ns to 222 ns - six times faster than standard 80C51 devices at the same clock rate. This frequency is fully supported across its −40 °C to +125 °C operating range.

Does the P89LPC933HDH include a second ADC or DAC functionality?

No, the P89LPC933HDH does not include ADC1, DAC0, or DAC1. Per Table 1 (Product comparison overview), only P89LPC935 and P89LPC936 feature dual 8-bit ADCs and DAC outputs. The P89LPC933HDH contains only ADC0 (single 8-bit converter) and no DAC channels - confirmed by pin descriptions (e.g., P2.0/ICB/DAC0/AD03 lists DAC0 only for P89LPC935/936) and functional block diagram exclusions.

Can the P89LPC933HDH perform In-System Programming (ISP)?

Yes, the P89LPC933HDH supports In-System Programming (ISP) via its UART interface, allowing firmware updates while the device is soldered into the target application. This capability relies on the built-in bootloader and requires no external programming hardware beyond a UART-to-USB adapter. ISP is fully documented in the NXP User Manual and is functionally identical across all P89LPC93x variants, including the P89LPC933HDH.

What are the power supply requirements for the P89LPC933HDH?

The P89LPC933HDH operates from a single 2.4 V to 3.6 V supply (VDD), with VSS as ground reference. All I/O pins are 5 V tolerant - they may be pulled up to or driven by 5.5 V signals without damage. The device draws typical power-down current of 1 μA (with voltage comparators disabled), and only VDD and VSS connections are required when using the internal oscillator and reset options - eliminating need for external regulators or level shifters in many designs.

Is the P89LPC933HDH pin-compatible with other members of the P89LPC93x family?

Yes, the P89LPC933HDH is pin-compatible with P89LPC934FDH, P89LPC935FDH, and P89LPC936FDH in the TSSOP28 package (SOT361-1), sharing identical pin numbering and electrical characteristics. However, peripheral availability differs: P89LPC933HDH lacks CCU, auxiliary RAM, ADC1, and DAC outputs present in higher variants - these pins retain GPIO or alternate functions (e.g., P1.6/OCB is GPIO on P89LPC933HDH) but do not implement those advanced peripherals.