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Looking for a solution for USB, power management, and micro SD cards

Dan Wiggins
Prodigy 10 points
Other Parts Discussed in Thread: TUSB4020BI, TUSB4020BI-Q1, TPD3S716-Q1, TIDA-00887, TIDA-00845

Hi all,

I'm working on a new product, and am looking for suggestions of parts to use.  I'm looking to make a USB hub that attaches to a cell phone.  It would have the following features:

1. A high-speed (or better) USB hub

2. Charge the Upstream port (meaning it can charge the cellphone) at up to 2.4A

3. Support an on-board SDXC micro SD card

4. Have at least 1 spare downstream facing port for other devices

Think of it as a USB hub/mass storage device/battery charger all wrapped up in one, and working all at the same time.  Any ideas what chips would be used for that?  There's a mismash of parts all over the TI site and I'm not able to really cull down potential options.

  • 0
    Prodigy 5 points

    Hello Dan,
    I agree that looking for specific devices on TI's site may be daunting, that is why we provide the Reference Designs.
    Reference Designs allows you to search designs for key words and then see which devices are used.

    For your design I searched for HUB.
    http://www.ti.com/reference-designs/index.html#search?keyword=hub

    43 matching designs out of 4141 total designs

    This one seems to be a close match:  Please let me know if you agree. It doesn't have the SD card feature.
    If this design is close enough, you could post again with TUSB4020BI as the part number and ask how to add an SD card to the TUSB.

    http://www.ti.com/tool/TIDA-00887        

    Automotive Dual-Port 2.4 A USB Hub Reference Design With Short-to-Battery   

    The TIDA-00887 is comprised of a two-port USB 2.0 hub with short-to-battery (STB) and short-circuit protection on both downstream ports provided by the TPD3S716-Q1. Both downstream ports are configured either as a custom divider mode or a dedicated charging port (DCP) provided by the TUSB4020BI-Q1 USB 2.0 hub if no upstream device is connected.  When an upstream is connected, the TUSB4020 hub supports charging via CDP. The ports automatically switch between divider mode, CDP mode, and DCP mode depending on the portable devices connected, in order to provide the fastest charging rate to the connected device.

    This reference design is similar to the TIDA-00845, however, it removes the in-system STB simulator and adds functionality for 2.4-A charging and automatic charge detection.

    Features
    • Fully functional USB hub with short-to-battery (STB) protection and BC 1.2 charge detection
    • Supports USB 2.0 high-speed data rates
    • Adjustable overcurrent protection current limit up to 2.4 A
    • IEC 61000-4-2 (Level 4) and ISO 10605 system-level ESD protection on VBUS_CON, DP/DM
    • STB protection (up to 18 V) on VBUS_CON, VD+, VD-
    • Short-to-ground protection on VBUS_CON for both downstream ports