Maxim Distributor

MAX14502 USB-to-SD™ Card Readers

Maxim's high-speed, USB-to-SD card readers with bypass

Maxim - MAX14502Maxim's MAX14502 USB-to-SD™ card readers provide a means for portable devices that support full-speed USB communication (12 Mbps) with one or two SD card slots, upgrading the USB SD card reader function to USB Hi-Speed (480 Mbps) operation. The MAX14502 has two modes of operation: Pass Thru and Card Reader. In pass thru mode, the SD and USB signals pass through the MAX14502 without modification, appearing like the device is not present. The host microprocessor firmware does not need modification, as there is no change from the host microprocessor's perspective. In Card Reader mode, the MAX14502 implements a Hi-Speed USB card reader that operates independently of the host microprocessor. All the capabilities of the full-speed USB port and SD card slot are preserved with the additional feature that allows a faster way for a PC to read or write to the SD card. The MAX14502 supports SD high capacity SDHC cards.

The MAX14502 feature advanced power-saving modes to reduce power consumption in portable applications. The low-power Sleep modes allow the ability to disable internal circuit blocks, providing power-saving operating modes. The default clock input for each part number is specified in the ordering information. The MAX14502 feature the option to change the default values using the I²C interface.

Features Applications
  • USB 2.0 high-speed and full-speed compliant
  • SDHC card support
  • Internal high-speed USB SD card reader eases host µP overhead
  • On-chip termination and pullup resistors
  • Internal SD switches allow for multiplexing two SD cards on a single microprocessor SD port
  • Accommodates clock input frequencies of 26 MHz, 19.2 MHz, 13 MHz, and 12 MHz
  • Internal clock squarer for low-amplitude TCXO signals
  • No power-supply sequencing required
  • Compatible with +1.8 V to +3.3 V I/O host microprocessor
  • Simple control mode requires only a single GPIO
  • I²C control provides multiple configuration options
  • I²C control required for two SD cards
  • On-chip power-on reset/brown-out reset
  • Cell phones
  • Digital still cameras
  • GPS
  • MP3 players
  • PDAs

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