TPS23881: Non-PoE Protocol Consult

Hi Penny,

Thanks for helps. I checked the D/S, it seems any detection or classification are disabled in the manual mode. So how about the overcurrent protection functions? Does this still achievable？ 

Best,

Stanley

Hi Penny,

In summary, customer still has concerns about the manual mode. Because our D/S indicates this mode is only for the diagnostic purpose. Pls double check again below customer demands can be achieved or not by our TPS23881. I also will reach to u if a webex call is needed between customer and BU.

Customer system demands:

1. Supply power directly without using the POE protocol,

2. Have voltage/current monitoring (the specific value can be read through I2C interface),

3. Overcurrent protection function (automatic shutdown during overcurrent/short circuit) is needed,

4. 2-port, power around 50W is needed.

Best,

Stanley

Hi Penny,

I want to add some questions here from customer. Pls feel free reach to me by e-mail if needed. Thanks

1. In manual mode, for 2-pairs application our TPS23881 can achieve 65W in maximum shown in below D/S, right? Or we should leave some margin here?

2. In Manual mode, how to detect whether is there PD device plugged in? Customer needs to know so they can send power enable command.

3. For power policing functions, why 0x1E register s becoming to all "F" value (equal to "127.5W") when triggering over-load protection? 

Best,

Stanley

Hi Penny,

Currently customer is working our TPS23881EVM but they cannot output ~60W power by using our GUI in manual mode. Could you pls show us how to do it here? Thanks.

Best,

Stanley

Hi Stanley,

You should set the power allocation in register 0x29 to 90W. After you connect a PD to the 4pair port and turn on the port, check with 2pair and 4pair PCUT values are correctly set.  

In your case, what kind of fault is reported on the port when you increase the power to 60W? Can you provide more details about your test setup and GUI configurations?  Thanks.

Best regards,

Penny

Hi Penny,

After following your recommendations, customer still cannot get 60W power output. Pls see below our GUI screenshot. Thanks.

Best,

Stanley

Stanley,

I am able to run ~60W on the manual mode port. What's kind of device is connected to the port? 

Hi Penny,

Thanks for help. After debugging, TPS23881 can output 65W power after turn on "2x foldback selection" and turn off "DC Disconnect". Do you know what's the reason about it? Thanks.

Best,

Stanley

Hi Penny,

Thanks for helps here. Another demand from customer is that they want our TPS23881 can automatically recover when overload or circuit short happens. Do you have any system solution for solving this here? 

Another questions is when overload or circuit short happens, which register will set in our controller?

Best,

Stanley