GL822 Product Overview

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CHAPTER 1

GENERAL DESCRIPTION

The GL822 is a USB 2.0 SD 3.0 UHS-I Memory Card Reader single chip. It supports USB 2.0 high-speed

transmission to Secure Digital

TM

(SD), SDHC, miniSD, microSD (T-Flash), MultiMediaCard

TM

(MMC),

RS-MMC, MMCmicro, MMCmobile, Memory Stick

TM

(MS), Memory Stick Duo

Memory Stick

TM

(MS PRO), Memory Stick PRO

Memory Stick PRO-HG

TM

(MS PRO-HG) and MS PRO Micro on one chip. It also supports next generation

huge density memory cards (up to 2TB), such as SDXC and Memory Stick XC. As a single chip solution for

USB 2.0 flash card reader, the GL822 complies with Universal Serial Bus specification rev. 2.0, USB Storage

Class specification ver.1.0, and SD/MMC card interface specification.

The GL822 integrates a high speed 8051 microprocessor and a high efficiency hardware engine for the best data

transfer performance between USB and flash card interfaces. Its’ pin assignment design fits to card sockets to

provide easier PCB layout. Inside the chip, it integrates 5V to 3.3V and 3.3V to 1.8V regulators and power

MOSFETs and it enables the function of on-chip clock source (OCCS) which means no external 12MHz XTAL

is needed and that effectively reduces the total BOM cost.