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GL838T
產品簡述

The GL838T is a high performance USB 2.0 Interface Flash Card Reader controller and targets for the application which require operating temperature -40°C to 85°C. GL838T supports USB 2.0 high-speed transmission to Secure DigitalTM (SD), miniSDTM, micro SDTM (T-Flash) , SDXC, MultiMediaCardTM (MMC), RS MultiMediaCardTM (RS-MMC), MMC Plus, MMC Micro, MMC Mobile , Memory StickTM (MS), Memory Stick DuoTM (MS Duo), High Speed Memory StickTM (HS MS), Memory Stick PROTM (MS PRO), Memory Stick PROTM Duo (MS PRO Duo), Memory Stick ROM and MS PRO Micro on one chip. As a single chip solution for USB 2.0 flash card reader, the GL838T complies with Universal Serial Bus specification rev. 2.0, USB Storage Class specification ver.1.0, and flash card interface specification each.

The GL838T can support different kinds of interfaces in single LUN and integrates a high speed 8051 microprocessor and a high efficiency hardware engine for the best data transfer performance between USB and flash card interfaces. Besides, the GL838T integrates 5V to 3.3V, 3.3V to 1.8V regulators and MOSFET switches. It also 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.

The GL838T pin assignment design fits to card sockets to provide easier PCB layout. 28 Pin QFN (5x5 mm) package is the available package type.


  • USB specification compliance
    • Comply with 480Mbps Universal Serial Bus specification rev. 2.0.
    • Comply with USB Storage Class specification rev. 1.0.
    • Support 1 device address and up to 4 endpoints: Control (0)/ Bulk Read (1)/ Bulk Write (2)/Interrupt (3).
  • Integrated USB building blocks
    • USB2.0 transceiver macro (UTM), Serial Interface Engine (SIE), Build-in power-on reset (POR).
  • Embedded 1T 8051 micro-controller
    • Embedded 48K Byte mask ROM and 40K+8K Byte SRAM
  • Secure DigitalTM and MultiMediaCardTM  
    • Supports SD specification v1.0 / v1.1 / v2.0
    • Compliant with Secure DigitalTM v5.0
    • Compatible with SDXC (Up to 2TB)
    • Supports MMC specification v3.X / v4.0 / v4.1 / v4.2 / v4.3.
    • x1 / x4 data transmission.
  • Memory StickTM / Memory Stick PRO / Memory Stick PRO Duo / Memory Stick Micro / Memory Stick XC
    • Comply with Memory Stick specification: MS 1.43, MS PRO 1.03, MS Micro 1.04
  • Support external serial Flash interface (8bit format) for the flexibility to load vender information and system option; it can be ISP by USB.
  • On chip clock source (OCCS) and no need of 12MHz Crystal Clock input.
  • On-Chip 5V to 3.3V and 3.3V to 1.8V regulator. No external regulator required.
  • On-Chip power MOSFETs for supplying flash media card power with programmable over current protection mechanism
  • Provide the thermal detection and protection mechanism
  • Available in 28 Pin QFN(5x5 mm) package

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