LPC92×1 (20-pin, 8-bit MCU)
NXP 80C51-based MCUs LPC92×1
20-pin, 8-bit MCUs with enhanced RC oscillator and temp sensor
Building on the success of the LPC900 family, these high-performance MCUs use an accelerated 80C51 CPU to enhance performance. They offer high integration and are available in small, 20-pin packages.
Key Features
- Accelerated 80C51 CPU
- 2/4/8-KB code Flash
- 256-Byte RAM
- System supervisory functions (POR, enhanced brownout detection)
- Two 16-bit timers
- System timer/RTC, Watchdog timer
- 8-bit ADC/DAC (LPC9241/9251)
- On-chip temperature sensor (LPC9241/9251)
- Two analog comparators
- Enhanced UART, I2C-bus
- Internal RC oscillator trimmed to a ±1% accuracy with clock doubler option
- Clock switching on the fly
- 18 configurable I/O pins
- Temperature range: -40 to + 85 °C
- Small, 20-pin packages: TSSOP20, DIP20
Application
- Consumer
- Industrial products
- Battery-powered devices
- Security systems
- HVAC
- Protocol conversion
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.
Integrated features such as byte-erasable Flash memory, enhanced timing functions, and power monitoring make these microcontrollers well suited to a very wide range of applications. On-chip features combine to reduce chip count, save board space, and lower overall cost.
The LPC92×1 microcontroller has 2/4/8 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.
Serial interfaces include a 400-kHz I2C bus and an enhanced UART with fractional baud-rate generator, break detect, framing error detection, automatic address detection, and versatile interrupt capabilities.
The LPC9241/9251 has a 4-channel, 8-bit A/D and 1-channel D/A converters. The on-chip temperature sensor operates over a wide range (-40 to +85 °C), and there are two 16-bit counter/ timers, each configurable to toggle a port output on timer overflow or to act as a PWM output.
LPC92×1 Block Diagram
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. To provide optimal support for active mode with minimal power, there is on-the-fly clock switching for 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 be optionally configured as an interrupt. 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 18 I/O, each with a VDD operating range of 2.4 to 3.6 V and a tolerance to 5 V. These MCUs are pin-to-pin compatible with P89LPC920/921/922/924/925 devices housed 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.
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
