TPS65987D: Questions regarding a TPS65987D design

Hello,

I've assigned this issue to the relevant expert who will get back to you shortly

Thank you Adam. Looking forward to hearing from the expert.

Nir.

Dear Nir,

1. The D+/D- lines can be left floating. As it stands, the battery charger part doesn’t even have D+/D- pins.
2. According to Section 8.3.2 of the datasheet, “When VIn_3V3 power is unavailable and power is available on VBUS1 or VBUS2 , the TPS65987D is powered from VBUS.”
3. Following the functional block diagram in Section 8.2 of the datasheet, VBUS1 is connected through PP_HV1 to provide power to the system. The power flow from VBUS1 to PP_HV1 of the TPS65987D to VBUS, SW, SYS, and BAT of the BQ24192I is correct.
4. I2C1 Port 1 can be either a master or a slave, but the default behavior is a slave. Please make sure the pullup voltage is LDO_3V3. We also recommend 10 kOhm resistor for the pullup.
5. Following Section 8.4.1 of the datasheet, the divider for ADCIN1 needs to be set between 0.40 and 0.48 in order to load Default Configuration 3. In addition, SPI_MISO needs to be 0. If you are fine with the Default Configuration you can use this method. If you want to load your own configuration you will need a SPI Flash or a host.
6. The minimum recommended voltage to power Vconn output on C_CC pins is 2.95 V. I would however recommend the typical supply of 5 V.
7. As shown in Section 6.7 of the datasheet, the continuous current limit on the power switch is 5 A.

 According to the datasheet, it is recommended to have 4.7uF on LDO_1V8.

 I would recommend having the battery charger part reviewed on the Battery Charging Forum.

Thanks,

Mike Emanuel

Please click  "This resolved my issue" button if this post answers your question.

Thank you Mike.

Just one thing is not yet clear to me: Say I wish to reach a 5A current sink on the TPS65987 (and I have the needed USB PD power supply for that)

I understand I will need to use the application customization tool to generate a binary file but what do I need

to have in terms of hardware and how do I download this file into the hardware is not clear to me yet.

Thank you,

Nir.

Adding to my last question:

Assuming I connect my host micro-controller via the I2C to the TPS65987, will I be able to control all of the device features by following

the "TPS65987DDH and TPS65988DH Host Interface Technical Reference Manual" (SLVUBH2B) document?

Nir.

Dear Nir,

You have two options.

The first is to use a Flash memory and program it following the GUI video below.

https://training.ti.com/tps6598x-application-customization-gui-tool-basic-introduction

The second is to use I2C. The following application note describes how to program using I2C and the flash.

"TPS65987 and TPS65988 SPI Flash Firmware Update Over I2C"

In addition, using the mentioned, "TPS65987DDH and TPS65988DH Host Interface Technical Reference Manual" will help as well.

Thanks,

Mike Emanuel

Please click  "This resolved my issue" button if this post answers your question.

Dear Mike,

Thank you. Please find attached my updated schematics. 

I have added connector J8 which will connect to the Aardvark I2C/SPI programmer's cable. I have also added U63 which is a flash device (same one as used in the Eval board of the TPS65987). I have

connected the SPI lines from the J8 connector to the SPI lines of the TPS65987 and to the Flash device.

My plan is to use the Application Customization Tool with the Aardvark programmer to program the Flash device with the needed TPS65987 configuration image.

Will this setup work?

Thank you,

Nir.

Power2.pdf