LPC9402 (Accelerated 8-bit MCU)
NXP 80C51-based MCUs LPC9402
Accelerated 8-bit MCU with universal LCD driver
Equipped with a universal LCD driver, this accelerated microcontroller delivers performance six times that of standard 80C51-based MCUs, and makes it easy to integrate advanced technology into everyday applications.
Key Features
- Accelerated 80C51 CPU
- 8-KB code Flash
- 256-Byte RAM
- LCD driver (32 segments x 4 backplanes)
- System supervisory functions (POR, enhanced brownout detection)
- Two 16-bit timers
- System timer/RTC, Watchdog timer
- Two analog comparators
- Enhanced UART, I2C-bus, SPI
- Internal RC oscillator trimmed to a ±1% accuracy with clock-doubler option
- Clock switching on the fly
- 23 configurable I/O pins
- Temperature range: -40 to + 85 °C
- Space-saving LQFP64 package
Application
- Consumer
- Industrial products
- Battery-powered devices
- Security systems
- White goods
These 8-bit microcontrollers use an accelerated architecture that executes instructions in two to four clocks, delivering performance that is six times higher than that of a standard 80C51 device.
The integrated LCD driver is applicable to a broad range of systems. Other integrated features such as byte-erasable Flash memory, enhanced timing functions, and power monitoring, make this MCU well suited to a very wide variety of applications, from battery-powered systems to white goods.
The LPC9402 has 8 KB of byte-erasable Flash code memory that can be used to simulate an EEPROM, with a full erase or program taking only 2 ms. It also has 256 bytes of Data RAM.
The LCD driver provides 32 segments and supports up to four backplanes. It delivers low-power operation and minimizes display overhead by using an on-chip display RAM with auto-increment addressing. It requires no external components, and is compatible with TTL/CMOS components and chip-on-glass technology.
Serial interfaces include a 400-kHz I2C bus, an SPI bus, and an enhanced UART with fractional baud-rate generator, break detect, framing error detection, automatic address detection, and versatile interrupt capabilities.
On-chip features combine to reduce chip count, save board space, and lower overall cost. There are two analog comparators and two 16-bit counter/ timers, each configurable to toggle a port output on timer overflow or to act as a PWM output.
A 7.37-MHz internal RC oscillator with a ±1% tolerance over voltage and ambient temperature lets the microcontroller operate without external oscillator components. Users can adjust the IRC oscillator to other frequencies. When the clock-doubler option is enabled, the output frequency is 14.746 MHz. The on-chip Watchdog timer has a separate on-chip oscillator (nominal 400 kHz), calibrated to ±5% at room temperature, requires no external components, and is selectable from eight values. For optimal support of active mode with minimal power, on-the-fly clock switching is available with the internal RC oscillator, the Watchdog oscillator, and the external clock source. Fast switching maximizes performance.
System supervisory functions include Power-on reset (POR) and enhanced brownout detection (BOD). Enhanced low voltage (brownout) detect allows a graceful system shutdown when power fails and can optionally be configured as an interrupt. The integrated real-time clock is equipped with independent power and clock supplies, permitting extremely low power consumption in power-save modes. To reduce power consumption further, each processor supports an idle mode and two different power-down modes. Total power-down current is less than 1 μA.
There are up to 23 I/O, each with a VDD operating range of 2.4 to 3.6 V and a tolerance to 5 V. The operating temperature range is -40 to +85°C. The MCU is pin-to-pin compatible with P89LPC9401 devices in the same packages.
Third-Party Development Tools
Through third-party suppliers, NXP offers a range of development and evaluation tools for its microcontrollers. For the most current listing, please visit www.nxp.com/microcontrollers.
LPC9402 Block Diagram
Selector Guide
©2009 NXP B.V. All rights reserved. Reproduction in whole or in part is prohibited without the prior written consent of the copyright owner. The information presented in this document does not form part of any quotation or contract, is believed to be accurate and reliable and may be changed without notice. No liability will be accepted by the publisher for any consequence of its use. Publication thereof does not convey nor imply any license under patent- or other industrial or intellectual property rights.
Date of release: March 2009 Document order number: 9397 750 16684 Printed in the Netherlands
