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TPS23880EVM-008: TPS23880EVM-008

Kingson Zhang
Prodigy 185 points
Part Number: TPS23880EVM-008
Other Parts Discussed in Thread: TPS23880, USB2ANY, MSP-EXP430FR5969, TPS23881, TPS23882, TPS23861, BOOST-PSEMTHR-007

1

Page 3 of the document "slvub84b TPS23880EVM: PoE, PSE, TPS23880 Evaluation Module", said that

"The TPS23880 device must be configured through the host to become operational. This EVM provides 2 ways to control the TPS23880: TPS23880EVM GUI (with USB2ANY) and MSP-EXP430FR5969 LaunchPad."

TPS23880EVM will doesn't work directly from factory (without configuration)?

2

If it must be configured, than I must be have a USB2ANY or MSP-EXP430FR5969 ?

  • 0
    TI__Expert 5615 points

    User6233052,

    You have understood correctly.  The TPS23880 does not offer autonomous mode (the ability to run without being configured first).  You must configure the device through our GUI (which requires a USB2ANY connection OR through use of an MCU (and the MSP-EXP430FR5969 daughter card).

    If looking for a solution that offers autonomous mode, please consider sampling the http://www.ti.com/product/TPS23881 or http://www.ti.com/product/TPS23882.  Both offer IEEE 802.3bt readiness and autonomous mode.  The TPS23881 offers 4-pair operation and is fully rated up to Type 4 power (it can source 90W of compliant and up to 125W of non-compliant power).  The TPS23882 is limited to 2-pair operation (it can source 30W of compliant and up to 60W of non-compliant power).  Both of these solutions also offer 24-port, full black box reference designs via our FirmPSE system firmware.  You can learn more about these solutions at http://www.ti.com/tool/TIDA-050026-23881 and http://www.ti.com/tool/TIDA-050026-23882.

    Please let me know if having any additional questions or concerns and thank you for considering PoE solutions from Texas Instruments,

  • 0 in reply to Thomas Lewis
    Prodigy 185 points

    Thomas Lewis said:

    User6233052,

    You have understood correctly.  The TPS23880 does not offer autonomous mode (the ability to run without being configured first).  You must configure the device through our GUI (which requires a USB2ANY connection OR through use of an MCU (and the MSP-EXP430FR5969 daughter card).

    If looking for a solution that offers autonomous mode, please consider sampling the http://www.ti.com/product/TPS23881 or http://www.ti.com/product/TPS23882.  Both offer IEEE 802.3bt readiness and autonomous mode.  The TPS23881 offers 4-pair operation and is fully rated up to Type 4 power (it can source 90W of compliant and up to 125W of non-compliant power).  The TPS23882 is limited to 2-pair operation (it can source 30W of compliant and up to 60W of non-compliant power).  Both of these solutions also offer 24-port, full black box reference designs via our FirmPSE system firmware.  You can learn more about these solutions at http://www.ti.com/tool/TIDA-050026-23881 and http://www.ti.com/tool/TIDA-050026-23882.

    Please let me know if having any additional questions or concerns and thank you for considering PoE solutions from Texas Instruments,

    " SLVUBP0A TPS23881EVM: PoE, PSE, TPS23881 Evaluation Module " also said that " The TPS23881 device must be configured through the host to become operational. This EVM provides two ways to control the TPS23881: TPS238x EVM GUI (with USB2ANY) and MSP-EXP430FR5969 LaunchPad. "

    Is this a mistake ?

  • 0 in reply to Kingson Zhang
    TI__Expert 5615 points

    User6233052,

    If the auto pin resistor is configured properly on the TPS23881 or TPS23882, no software configuration is required for power up.  Please refer to section 4 on page 8 of the EVM User Guide for additional information.

    With that said, please be aware that we have released a new version of IC firmware which we suggest for improved system performance.  Upgrading the RAM to this new firmware requires some configuration work.  You can learn more about that process by reviewing our document on that topic located here.

    I will also work with the Application Engineer who wrote the TPS23881 EVM User Guide to make Section 2.2 more clear (the one you highlight here).

    Thank you,

  • 0 in reply to Thomas Lewis
    Prodigy 185 points

    1,  As showed in TPS23861 Datasheet Simplified Schematic, AUTO pin can be floating, R_AUTO resistor is Optional.

    But PIN Description section said that " Floating AUTO pin will disable autonomous operation. "

    Is this a conflict ?

    2,  If I want a true AUTO mode of PSE TPS23881 in our application system for PD whose power is from 30W to 90W or above, than the AUTO pin must be connected a 7.7k ohm resistor to GND ?

    3,  If I select the 7.7k ohm pulldown resistor on AUTO pin of TPS23881EVM, ports J21 and J9 of the PSE (TPS23881EVM and BOOST-PSEMTHR-007) can deliver 90W power separately which sum is 180W or simultaneously which sum is 90W?

    4,  What the “ Channel capacitance measurement range ”(in TPS23881 Datasheet) stands for ?

    It refers to the “signature capacitance ” in IEEE Std 802.3 ?

  • 0 in reply to Kingson Zhang
    TI__Expert 5615 points

    User6233052,

    I am going to hand this thread over to our PSE Application Engineer, Penny Xu, for continued conversation. She will reply within 24 hours.

    Thank you for considering PoE solutions from Texas Instruments,

  • 0 in reply to Kingson Zhang
    TI__Genius 15655 points

    Hi Kingson,

    Please see my answers below.

    1. If you leave auto pin floating, the autonomous mode is disabled. You will need configure the device through I2C.

    2. If you configure auto pin to 90W, all ports will have the same configuration. One TPS23881 is configured as four 90W ports. The max power of each port is 90W. It can’t go above 90W. If you need higher power limit, you can’t use autonomous mode. You will need leave auto pin floating and configure it to semi auto mode.

    3. 90W is at port level. If you want to control total ports’ power, you will need a host to do power management.

    4. The cap measurement range of TPS23881 is to detect nonstandard legacy devices which usually present high capacitance on the port. It does nothing to do with the standard.

    Thanks,

    Penny