NXP Semiconductors P89LPC9241FDH,112

Overview

P89LPC9241FDH,112 from NXP Semiconductors is an 8-bit accelerated 2-clock 80C51 microcontroller in TSSOP20 package, featuring 4 kB byte-erasable flash memory, 256-byte RAM, 8-bit ADC with four analog inputs (AD10–AD13), on-chip temperature sensor, dual analog comparators, and 400 kHz I²C-bus interface. It operates from 2.4 V to 3.6 V with 5 V-tolerant I/Os and targets low-cost embedded control in industrial sensors and smart peripherals.

For engineers reviewing the P89LPC9241FDH,112 datasheet, P89LPC9241FDH,112 pinout, P89LPC9241FDH,112 application, or P89LPC9241FDH,112 equivalent, key selection criteria include its integrated ADC/DAC capability, 18 MHz max clock frequency with internal RC oscillator option, 15+ configurable I/O pins, brownout detection, and In-Application Programming support for field firmware updates.

Technical Context

The P89LPC9241FDH,112 implements a high-performance 80C51 core executing instructions in two to four clocks-six times faster than standard 80C51 at same frequency-enabling 111 ns minimum instruction cycle at 18 MHz. Its system architecture integrates a 23-bit real-time clock/system timer, dual 16-bit counter/timers (configurable as PWM or toggle outputs), and enhanced UART with fractional baud rate generator.

It supports multiple clock sources including internal RC oscillator (tunable, with clock doubler), watchdog oscillator (400 kHz ±5%), and external crystal/resonator (up to 18 MHz), with dynamic clock switching for power/performance optimization. Power management includes idle mode and two power-down modes, with typical 1 µA total power-down current when voltage comparators are disabled.

Key Specifications

Pinout & Package

Package: TSSOP20 (SOT360-1), plastic thin shrink small outline package, 20 leads, 4.4 mm body width, 0.65 mm lead pitch.

Key Features

Applications

Equivalent & Alternatives

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

Compared with P89LPC9241FDH,112, the P89LPC9251FDH offers double flash capacity with identical peripherals and pin compatibility-ideal for firmware growth-while the PCA9306D,118 serves a completely different signal-conditioning role and cannot substitute for microcontroller functionality.

Availability

P89LPC9241FDH,112 is available at Aetrix Electronics and suitable for industrial sensor nodes, smart thermostat controllers, and programmable logic relays requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant manufacturing.

Supply support for P89LPC9241FDH,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 headquartered in Eindhoven, Netherlands, specializing in secure connectivity solutions for automotive, industrial, and IoT applications.

The P89LPC92X1 family was designed as cost-optimized, low-pin-count 8-bit MCUs for space-constrained embedded control-emphasizing integration of analog peripherals (ADC, comparators, temperature sensor), robust I/O, and ultra-low-power operation.

FAQ

What is the maximum operating frequency of the P89LPC9241FDH,112?

The P89LPC9241FDH,112 supports a maximum operating frequency of 18 MHz. This applies whether using an external crystal/resonator or the internal RC oscillator with clock doubler enabled. At 18 MHz, the accelerated 2-clock core achieves a minimum instruction cycle time of 111 ns, delivering six times the throughput of a standard 80C51 at the same clock rate. The P89LPC9241FDH,112's flash configuration bits allow frequency range selection from 20 kHz up to this 18 MHz limit.

Does the P89LPC9241FDH,112 support in-system programming (ISP)?

Yes, the P89LPC9241FDH,112 supports In-System Programming (ISP) via its UART interface, allowing firmware updates while the device is soldered into the target application board. This capability requires no external programming hardware beyond a simple serial connection and is enabled by the on-chip bootloader. The P89LPC9241FDH,112 also supports In-Application Programming (IAP), permitting code modification during runtime-a feature critical for field-upgradable firmware. Both ISP and IAP rely on the 4 kB flash memory's byte-erasable architecture.

How many analog inputs does the ADC in the P89LPC9241FDH,112 support?

The P89LPC9241FDH,112 integrates an 8-bit ADC with four dedicated analog input channels: AD10, AD11, AD12, and AD13-mapped to pins P0.1, P0.2, P0.3, and P0.4 respectively. These inputs support single-ended measurements referenced to VSS. Additionally, the on-chip temperature sensor is internally connected to the ADC, enabling direct die-temperature readings without external components. The P89LPC9241FDH,112 does not support differential ADC mode or additional external analog multiplexing beyond these four channels.

What power supply voltage range is supported by the P89LPC9241FDH,112?

The P89LPC9241FDH,112 operates from a supply voltage range of 2.4 V to 3.6 V on the VDD pin. Its I/O pins are 5 V tolerant-capable of being pulled up to or driven by 5.5 V logic levels without damage-enabling seamless interfacing with legacy 5 V peripherals. The device includes an enhanced low-voltage (brownout) detection circuit that triggers a controlled system shutdown when VDD falls below the threshold, preventing corrupted flash writes or erratic behavior. This dual-voltage resilience makes the P89LPC9241FDH,112 suitable for mixed-signal designs where 3.3 V core logic coexists with 5 V interfaces.

Is the P89LPC9241FDH,112 pin-compatible with other devices in the P89LPC92X1 family?

Yes, the P89LPC9241FDH,112 is pin-compatible with other TSSOP20 variants in the P89LPC92X1 family-including P89LPC9201FDH, P89LPC9211FDH, P89LPC922A1FDH, and P89LPC9251FDH-as confirmed by identical pin configurations in Figures 5 and 6 of the datasheet. All share the same 20-pin TSSOP package (SOT360-1), identical pin functions, and compatible electrical characteristics. However, flash size (2/4/8 kB), ADC/DAC inclusion, and temperature sensor presence vary across models; the P89LPC9241FDH,112 and P89LPC9251FDH are the only variants with both ADC and DAC functionality.