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NXP公司的LPC1857/53是基于ARM Cortex-M3內的 32位MCU，具有高達1MB閃存，136kB SRAM，以太網和兩個高速USB以及LCD和EMC等。ARM Cortex-M3處理器工作頻率高達180MHz，內置了支持8個區域的存儲器保護單元（MPU）和嵌套向量中斷控制器 (NVIC)，具有豐富外設，主要用在工業控制，RFID閱讀器，電子測量儀器，消費類電子和白色家電。本文介紹了LPC1857/53主要特性和優勢，方框圖，以及Hitex LPC1850評估板主要特性，電路圖和元件布局圖。 The LPC1857/53 are ARM Cortex-M3 based microcontrollers for embedded applications. The ARM Cortex-M3 is a next generation core that offers system enhancements such as low power consumption, enhanced debug features, and a high level of support block integration. The LPC1857/53 operate at CPU frequencies of up to 180 MHz. The ARM Cortex-M3 CPU incorporates a 3-stage pipeline and uses a Harvard architecture with separate local instruction and data buses as well as a third bus for peripherals. The ARM Cortex-M3 CPU also includes an internal prefetch unit that supports speculative branching. The LPC1857/53 include up to 1 MB of flash and 136 kB of on-chip SRAM, 16 kB of EEPROM memory, a quad SPI Flash Interface (SPIFI), a State Configurable Timer (SCT)subsystem, two High-speed USB controllers, Ethernet, LCD, an external memory controller, and multiple digital and analog peripherals. LPC1857/53主要特性和優勢： Processor core ARM Cortex-M3 processor, running at CPU frequencies of up to 180 MHz. ARM Cortex-M3 built-in Memory Protection Unit (MPU) supporting eight regions. ARM Cortex-M3 built-in Nested Vectored Interrupt Controller (NVIC). Non-maskable Interrupt (NMI) input. JTAG and Serial Wire Debug, serial trace, eight breakpoints, and four watch points. Enhanced Trace Module (ETM) and Enhanced Trace Buffer (ETB) support. System tick timer. On-chip memory Up to 1 MB on-chip dual bank flash memory with flash accelerator. 16 kB on-chip EEPROM data memory. 136 kB SRAM for code and data use. Multiple SRAM blocks with separate bus access. 64 kB ROM containing boot code and on-chip software drivers. 32-bit One-Time Programmable (OTP) memory for general-purpose use. Clock generation unit Crystal oscillator with an operating range of 1 MHz to 25 MHz. 12 MHz internal RC oscillator trimmed to 1 % accuracy over temperature and voltage. Ultra-low power RTC crystal oscillator. Three PLLs allow CPU operation up to the maximum CPU rate without the need for a high-frequency crystal. The second PLL is dedicated to the High-speed USB, the third PLL can be used as audio PLL. Clock output. Configurable digital peripherals: State Configurable Timer (SCT) subsystem on AHB. Global Input Multiplexer Array (GIMA) allows to cross-connect multiple inputs and outputs to event driven peripherals like timers, SCT, and ADC0/1. Serial interfaces: Quad SPI Flash Interface (SPIFI) with 1-, 2-, or 4-bit data at rates of up to 40 MB per second. 10/100T Ethernet MAC with RMII and MII interfaces and DMA support for high throughput at low CPU load. Support for IEEE 1588 time stamping/advanced time stamping (IEEE 1588-2008 v2). One High-speed USB 2.0 Host/Device/OTG interface with DMA support and on-chip high-speed PHY (USB0). One High-speed USB 2.0 Host/Device interface with DMA support, on-chip full-speed PHY and ULPI interface to external high-speed PHY (USB1). USB interface electrical test software included in ROM USB stack. Four 550 UARTs with DMA support: one UART with full modem interface; one UART with IrDA interface; three USARTs support UART synchronous mode and a smart card interface conforming to ISO7816 specification. Two C_CAN 2.0B controllers with one channel each. Two SSP controllers with FIFO and multi-protocol support. Both SSPs with DMA support. One Fast-mode Plus I2C-bus interface with monitor mode and with open-drain I/O pins conforming to the full I2C-bus specification. Supports data rates of up to 1 Mbit/s. One standard I2C-bus interface with monitor mode and standard I/O pins. Two I2S interfaces with DMA support, each with one input and one output. Digital peripherals: External Memory Controller (EMC) supporting external SRAM, ROM, NOR flash, and SDRAM devices. LCD controller with DMA support and a programmable display resolution of up to 1024H 768V. Supports monochrome and color STN panels and TFT color panels; supports 1/2/4/8 bpp Color Look-Up Table (CLUT) and 16/24-bit direct pixel mapping. SD/MMC card interface. Eight-channel General-Purpose DMA (GPDMA) controller can access all memories on the AHB and all DMA-capable AHB slaves. Up to 164 General-Purpose Input/Output (GPIO) pins with configurable pull-up/pull-down resistors and open-drain modes. GPIO registers are located on the AHB for fast access. GPIO ports have DMA support. Up to 8 GPIO pins can be selected from all GPIO pins as edge and level sensitive interrupt sources. Two GPIO group interrupt modules enable an interrupt based on a programmable pattern of input states of a group of GPIO pins. Four general-purpose timer/counters with capture and match capabilities. One motor control PWM for three-phase motor control. One Quadrature Encoder Interface (QEI). Repetitive Interrupt timer (RI timer). Windowed watchdog timer. Ultra-low power Real-Time Clock (RTC) on separate power domain with 256 bytes of battery powered backup registers. Event recorder with three inputs to record event identification and event time; can be battery powered. Alarm timer; can be battery powered. Analog peripherals: One 10-bit DAC with DMA support and a data conversion rate of 400 kSamples/s. Two 10-bit ADCs with DMA support and a data conversion rate of 400 kSamples/s. Decryption: Hardware-based AES decryption programmable through an on-chip API. Two 128-bit secure OTP memories for AES key storage and customer use. Random Number Generator (RNG) accessible through AES API. Unique ID for each device. Power: Single 3.3 V (2.2 V to 3.6 V) power supply with on-chip internal voltage regulator for the core supply and the RTC power domain. RTC power domain can be powered separately by a 3 V battery supply. Four reduced power modes: Sleep, Deep-sleep, Power-down, and Deep power-down. Processor wake-up from Sleep mode via wake-up interrupts from various peripherals. Wake-up from Deep-sleep, Power-down, and Deep power-down modes via external interrupts and interrupts generated by battery powered blocks in the RTC power domain. Brownout detect with four separate thresholds for interrupt and forced reset. Power-On Reset (POR). Available as LQFP208, LBGA256, or TFBGA180 packages. LPC1857/53應用： Industrial RFID readers Consumer e-Metering White goods 
圖1。LPC1857/53方框圖 Hitex LPC1850評估板 The Hitex LPC1850 Eval board allows you to quickly and easily evaluate the LPC1800 family of microcontrollers. The microcontroller, board, and the accompanying features make it a great starting point for your next Cortex-M3 project. Populated with the LPC1850 to demonstrate LPC1800 features, the LPC1850 offers industry leading performance, large internal memories and advanced peripherals. Hitex LPC1850評估板主要特性： The evaluation board has the following features: - CPU: LPC1850 (ARM Cortex-M3) - Power-over-Ethernet - Ready for energy consumption analysis with PowerScale of the complete board, the CPU-core and other peripherals - SDRAM, SRAM, parallel flash, NAND flash, qSPI flash - Temperature sensor, SD card, media-connector - CAN, UART, Ethernet, USB (Host, Device, OTG) - Debug with standard ARM JTAG and JTAG + Trace connector - Ready for Jennic ZigBee module - Small onboard display and NXP standard display / LCD interface - Touch buttons and LEDs - Wrap field for user circuits - Audio IN and OUT, microphone IN, headphones OUT and a D-Class amplifier - Ready for 4x ADC1415 analog-to-digital converters with user filtering option
圖2。Hitex LPC1850評估板外形圖
圖3。Hitex LPC1850評估板電路圖（1）
圖4。Hitex LPC1850評估板電路圖（2）
圖5。Hitex LPC1850評估板電路圖（3）
圖6。Hitex LPC1850評估板電路圖（4）
圖7。Hitex LPC1850評估板電路圖（5）
圖8。Hitex LPC1850評估板電路圖（6）
圖9。Hitex LPC1850評估板電路圖（7）
圖10。Hitex LPC1850評估板電路圖（8）
圖11。Hitex LPC1850評估板PCB元件布局圖 詳情請見： 
LPC1857_53[1].pdf
(1.48 MB)
Hitex_LPC1850_Eval_Board_Schematics[1].pdf
(245.67 KB)
來源：網絡 |
