TPS23880: reference code.

Hi Tommy,

Please see my response below:

we have some question about the TPS2388x series.

1.does the TPS23880 can support POH application(audio system up to 90w)?

[PX]TPS23880 can support PoH PDs with some host control. Please refer to the training slides #44 to #49 in the attached slides. 7737.UpgradingIEEE802.3atandNon-StandardHighPowerPSESystemtoIEEE802.3btCompliantSystem_Full.pdf

2. why does TPS2388x series firmPSE support different MPS430 model? is it because different reference code are use for different function?

[PX]The FirmPSE solution is our black box total solution for PSE systems. We have production ready code written and validated with MSP430F5234 and you don't need to understand how to control TPS2388x devices and instead you only need to configure system level parameters like system power budget, total number of ports, power management policy, etc. You can request access to the documents, GUI to learn more about it (https://www.ti.com/product/TPS23881 ). You can also check the training videos here:https://www.ti.com/power-management/power-over-ethernet-poe/support-training.html

At the same time, we also offer MSP430 reference code (open source using MSP430FR5969) to provide guidance to customers who want to develop their own system SW with different host controllers. 

3.if customer does not use MPS430, can use own processor or DSP to directly control the TPS23880? 

[PX]Yes. You can use any processors or MCUs to control TPS23880 as long as it has I2C. 

4. the 4-pair TPS23880 output application can directly connect to the 2-pair PD controller without change the code?

[PX]When talking about 2 pair PD, do you mean the PD is only connected to 1 pair set (ALT A or ALT B) of the cable? And you have 2 PSE channels connected to both ALT A and ALT B on the other side of the cable? If my understanding is connect, you still can manage power on the port and need some minor SW changes to cover this scenario. We can talk about detailed implementations if needed. 

In addition, I want to make sure you understand that TPS23881 is a newer device which has better SW support and better price. I would like recommend TPS23881 for new designs. Thanks.