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GL3231S is an USB 3.1 Gen1 Dual-LUN card reader controller, it provides 2 LUNs (Logic Unit Number) which can support various types of memory cards, such as Secure DigitalTM(SD), SDHC, miniSD, microSD (T-Flash), MultiMediaCardTM (MMC), RS-MMC, MMCmicro and MMCmobile. It also supports high density memory cards (Capacity up to 2TB), such as SDXC, ultra high speed memory cards, SD 3.0 UHS-I and the latest generation high speed memory cards SD 4.0 UHS-II card. GL3231S also supports SANDISK EXTREME® 160 MB/s microSD UHS-I CARD.


GL3231S integrates a high speed 8051 microprocessor and a high efficiency hardware engine for the best data transfer performance between USB and various memory card interfaces. It supports Serial Peripheral Interface (SPI) for firmware upgrade to SPI Flash Memory via USB port. It integrates 5V to 3.3V and 3.3V to 1.2V regulators and power MOSFETs which can reduce system BOM cost. It also integrates 5V to 1.2V DC-DC as alternative to improve the power efficiency.

  • USB specification compliance
    • Comply with Universal Serial Bus 3.1 Specification rev. 1.0 (USB 3.1 Gen 1)
    • Comply with Universal Serial Bus Specification rev. 2.0 (USB 2.0)
    • Comply with USB Mass Storage Class Specification rev. 1.0
    • Support USB Mass Storage Class Bulk-Only Transport (BOT)
    • Support 1 device address and up to 3 endpoints: Control (0) / Bulk Data Read In (1) / Bulk Data Write Out (2)
    • Support 5 Gbps SuperSpeed, 480 Mbps high-speed, and 12 Mbps full-speed transfer rates
  • Integrated USB building blocks
    • USB2.0 transceiver macrocell (UTM), Serial Interface Engine (SIE), embedded Power-On Reset (POR)
  • Embedded high speed 8051 micro-controller
  • High efficient DMA hardware engine improves transfer rate between USB and flash card interfaces
  • Support Secure DigitalTM v1.0/ v1.1/ v2.0/ SDHC/ SDXC (Capacity up to 2TB)
  • Support Secure DigitalTM v3.01 UHS-I (Ultra High Speed): SDR12/ SDR25/ SDR50/ DDR50/ SDR104
  • Support Secure DigitalTM v4.0 UHS-II: Full Duplex Mode and Half Duplex Mode
  • Support Secure DigitalTM v5.0
  • Support DDR200 speed mode to enhance the UHS-I performance
  • Support MultiMediaCardTM (MMC)
    • MMC specification v3.x/ v4.0/ v4.1/ v4.2
    • x1/ x4/ x8 bit data bus
  • Support HUAWEI Nano Memory Card
  • Support Serial Peripheral Interface (SPI) for firmware upgrade to SPI Flash Memory via USB interface
  • On-chip power MOSFETs for all flash media cards power source
  • On-chip 5V to 3.3V and 3.3V to 1.2V regulator
  • On-chip 5V to 1.2V DC-DC to improve power efficiency.
  • Support 5V power input or 3.3V power input
  • Support USB 2.0 LPM (Link Power Management)
  • Support USB 3.1 Gen 1 LTM (Latency Tolerance Messaging)
  • Support USB 3.1 Gen 1 U1/U2/U3 low power link state
  • Support dual SD4.0 interfaces with UHS-I: SDR12/ SDR25/ SDR50/ DDR50/ SDR104 bus mode and UHS-II: FD156/HD312
  • Support programmable SSC (Spread Spectrum Clocking), clock rate for SD memory card interface
  • Support programmable LED behavior, Read Only option for specific application
  • Support Over-Current protection mechanism
  • Available in QFN64 pin package (8x8mm) for 2 LUNs SD

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