TPS65988: About the relationship between Dead Battery Flag and Charging.

Yasuhide Uchida

Part Number: TPS65988

Please refer to attached figure.

First I connect a PD charger to VBUS1, and port2:source don’t output 5V 3A. The output works 5V 0.9A.

Next, When I execute DBfg(Dead Battery Flag Clear) of port2 by commands DBfg(Dead Battery Flag Clear) of F/W tool, the output of port2 switches output from 5V 0.9A to 5V 3A.

I have three questions.

(1)Why does not the TPS65988 output 5V 3A when Dead Battery Flag is set ?

(2)Why does the TPS65988 output 5V 3A when Dead Battery Flag is cleared ?

I tried doing DBfg command by F/W setting because the mass production cannot use I2C.

I succeeded in output 5V 3A.

But I concern that F/W setting is correct or not.

(3)Please tell me correct setting of DBfg command in F/W ?

My setting is below.

over 3 years ago

0 Christodulos Tsongas over 3 years ago

TI__Genius 12905 points

Could you please attach your project (.pjt) file to this thread for me to look at?

Thanks,

Chris

0 Yasuhide Uchida over 3 years ago in reply to Christodulos Tsongas

Prodigy 170 points

Hi,

I attach my project file.

Please confirm this.

7282.test.pjt

0 Christodulos Tsongas over 3 years ago in reply to Yasuhide Uchida

TI__Genius 12905 points

Thank you for the PJT. I have reviewed it and the TPS65988 datasheet. What is the input voltage to BUSPOWER (ADCIN1) pin?

I think you should take a look at the following App note about dead battery for the TPS65988 (Section 3.1)

slvae65

Also, in the TPS65988 datasheet, you can check the ADCIN1 config settings in section 8.4

slvsdb5

If changing the ADCIN value is not practical, then it may be good to map another of the GPIO to the Port 0 Lad App Config Event in order to clear the dead battery flag if port 0 is used first.

0 Yasuhide Uchida over 3 years ago in reply to Christodulos Tsongas

Prodigy 170 points

Thank you for your comments.

Input the voltage to ADCIN1 pin is 1.1V (DIV=0.33).

0 Yasuhide Uchida over 3 years ago in reply to Yasuhide Uchida

Prodigy 170 points

If I don't clear of the dead battery flag of port0(sink), Is there side effects ?

+1 Christodulos Tsongas over 3 years ago in reply to Yasuhide Uchida

TI__Genius 12905 points

The dead battery can affect the CC pin configurations and limit the current. Leaving the dead battery flag causes the power management of the PD to use the VBUS, not VIN_3V3.

0 Yasuhide Uchida over 3 years ago in reply to Christodulos Tsongas

Prodigy 170 points

I did resolving status, but I have additional a question.

I cannot clear of the dead battery flag of port0(sink) in my system.

So I want to know more details about the CC pin configurations and limit the current.

Could you tell me about limiting in details? (example, current limit value, )

0 Christodulos Tsongas over 3 years ago in reply to Yasuhide Uchida

TI__Genius 12905 points

The current will be limited to 900mA until dead battery is cleared

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TPS65988: About the relationship between Dead Battery Flag and Charging.