原标题：Elan Digital USBHC869 MCU总线USB主控制方案

　　Elan Digital公司的USBHC869是全速USB主控制器,可使微处理器和微控制器增加USB主控制功能,USB2.0全速主控制,3.3V工作,I/O电压3.3V,2.8V或1.8V,单独的16KBTx和Rx FUFO,功耗只有40mW,主要用在手机,智能手机,UMPC,主板和MID等.本文介绍了USBHC869主要特性,多中和MCU连接图以及评估板电路图.

　　USBHC869: Microprocessor bus USB Host Controller

　　The USBHC869 is a Full Speed USB Host Controller designed to add USB Host capability to Microprocessors and Microcontrollers. The device measures just 4 x 4 mm is size thus consuming very little board space.

　　The asynchronous parallel bus is compatible with common microprocessor bus architectures or can be attached to the port pins of a microcontroller. For maximum flexibility, the interface can be used in 8 bit or 16 bit mode and at any I/O voltage level of between 1.8 and 3.3V.

　　The USBHC869 has an integrated crystal oscillator and a Phase Lock Loop module allowing a number of clocking options.

　　A very low power shutdown mode is available to conserve power in battery powered applications. An attached USB device can still signal a Resume wakeup signal to the host processor when the USBHC869 is in shutdown.

　　The USBHC869 has a fully USB1.1 compliant full speed (12Mb/s) transceiver together with integrated pull down resistors to further reduce the component count and save space.

　　USBHC869主要特性:

　　● USB2.0 Full Speed Host

　　● Low power 3.3V operation

　　● 3.3V, 2.8V or 1.8V I/O

　　● 8/16-bit low pin count microprocessor interface

　　● Separate 16KByte TX and RX FIFOs.

　　● Low power consumption: 40mW

　　● Very low power shutdown mode

　　● Very small package : 36 pin LGA 4mm x 4mm x 0.9mm

　　● Fully ‘green’, lead-free and RoHS compliant

　　USBHC869应用:

　　The USBHC869 is a USB Host Controller ideal for embedded applications including :

　　mobiles / cellphones

　　smartphones

　　UMPC

　　motherboards

　　Mobile Internet Devices - MID

　　As a high performance alternative to FTDI, Maxim and NXP host controllers