描述 Description

OVERVIEWThe MA8621 is a high performance solution for USB 2.0 High Speed 3-port hub with SD card controller which is fully compliant with Universal Serial Bus Specification 2.0. The controller inherits advanced serial interface technology to consume the least power when 3 DS (downstream) ports function simultaneously.
The MA8621 is an innovation that integrates function to combine USB 2.0 Hub and SD card reader. The reader complies with SD, SDHC, SDXC and MMC card specification. With single IC, MA8621 provides system solution targeting the multi-media set top box for multiple USB ports and reader application.
MA8621 adapt Single Transaction Translator (STT) and Ganged power management to achieve cost effective purpose. Users can also implement multiple Hub configuration options through external EEPROM.
USB2.0 Hub

特性 Features

USB2.0 Hub·Compliant with USB Specification Revision 2.0·Upstream Port supports high-speed (480MHz) and full-speed (12MHz) traffic
·Configurable 3/2 downstream ports support high-speed, full-speed, and low-speed
·Backward compatible to USB Specification Revision 1.1

·12Mhz Oscillator clock input
·Integrated upstream 1.5KΩ pull-up downstream 15KΩ pull-down resisters
·Single Transaction Translator (Single TT)
·Ganged Power Control and Global Over Current detection for downstream ports
·Leading small power consumption USB2.0 Hub
·Integrated Fast 8051 microprocessor
·On chip 5V to 3.3V/1.2V regulator
·Automatic re-enumeration for switching between self-powered and bus-powered modes
·External EEPROM interface for customized information storage·Customized VID, PID
·Number of downstream port
·Product ID
·Serial number

·Two LED port indicator mode·3 Downstream port LED (enable green) and one Active/Suspend LED(Red)
·One joint Downstream port LED for 3 ports (enable green) and one Active/Suspend LED(Red)