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Replies: 3
Views: 173
Part Number: TPS65987EVM
Functional block diagram：
Function description to be implemented:
1、不插入适配器时，PAD能够读取USB设备，即PAD可以对外供电，同时可以与外部进行数据交互。
1. When the adapter is not inserted, the pad can read the USB device, that is, the pad can supply power to the outside and interact with the outside.
2、插入适配器时，适配器以5V电压给PAD充电，同时，PAD能够通过USB进行数据交互。
2. When the adapter is inserted, the adapter charges the pad with 5V voltage. At the same time, the pad can exchange data through USB.
In the current test, tps65987 EVM board and 24V adapter are used for power supply
Question:
1、如何通过Application customization tool配置工具？读取工装板上芯片内配置文件，如何从该配置工具下载到工装板芯片内部？
1. How to configure the tool through the application customization tool? Read the on-chip configuration file on the tooling board. How to download it from the configuration tool to the on-chip configuration file on the tooling board?
2、目前评估板给PAD充电的时候，会自动协商成9V快充模式，我们不想要快充模式，怎么进行配置？
2. At present, when the evaluation board charges the pad, it will automatically negotiate the 9V fast charging mode. We don't want the fast charging mode. How to configure it?
3、将PAD和评估板连接好后，插拔电源适配器，无法自动切换到充电模式。按EVM评估板的复位按键可以进入充电模式。
3. After the pad and the evaluation board are connected, plug and unplug the power adapter, and it cannot automatically switch to the charging mode. Press the reset button of the EVM evaluation board to enter the charging mode.
按复位前PAD能够识别USB设备，复位后进入快充模式，就不能识别USB设备，为什么？
Before reset, pad can identify USB device. After reset, when it enters fast charging mode, it cannot identify USB device. Why?
Hello Zhang,
1. Instead of reading the chip configuration on the EVM, recommend using one of the templates for the TPS65987D, and then changing the configuration for what you would like your system to be able to support.
2. Go into the sink capabilities register, and only put 5V sink capabilities if that is the only thing you want your system to support
3. This is considered a FRS (fast role swap) event, and if you are going from 5V to 5V, that will be difficult. Typically you would do FRS from 20V sink to 5V source. You can refer to the following app notes as reference
http://www.ti.com/lit/an/slvae20/slvae20.pdf
http://www.ti.com/lit/wp/slyy147/slyy147.pdf
Regards,
Adam McGaffin
In reply to Adam Mc Gaffin:
Hi,
If we use a 5V adapter as power supply, can we use TPS65987 to complete these functions?1) Charge other device through TPS65987 , 2) At the same time, the D+ D- signal of device can be recognized, which is similar to the function of the port dock.
What's more, once the adapter is removed, the device can work as source power.
while, it seems that the TPS65987D EVM doesn't work as expected. When a 5V adapter was used to supply power for EVM, the device cannot be charged by EVM through type-c connecting. Once a 24V adapter was used, the device could be charged by EVM taht the charging power was 9V. The configuration project such as PDO has no effect.
In reply to user6275027:
Hello,
If you supply the TPS65987D with 5V, and the connected device requires 9V to be able to charge, then your test setup will never work.
The DCDC on the EVM is a buck, and setup to receive a supply of 20V, and output 5V, 9V, 15V, and 20V to the TPS65987D. If you only supply 5V to the TPS65987D, our device will never be able to supply more than 5V to anything connected to it.