TPS25750: tps25750 without EERPROM to configuration

Hi,

Are you using TPS25750 for any other functionality other than sinking 20V? If you are only looking to sink 20V from adapter, I would recommend using TPS25730 instead.

wang alyssa said:

1. Can i change mode from 'PTCH' to 'APP ' WITHOUT EEPROM?

2. do i need change ADNIN1 and ADCIN2 in hardware to enter NegotiateHighVoltage mode?

If you want the device boot into APP after start up you need to change the ADCIN1/2 hardware to be NegotiateHighVoltage.

wang alyssa said:

3. How to make type-c input 20V?  i think i am in AlwaysEnableSink mode, so how to enable configuration? do you have any driver/library of tps25750?

Depends on what other functionality you need, but putting the device into NegotiateHighVoltage is one way of doing it. The other way is to configure the project to have 20V sink and load it onto the PD. If you are in AlwaysEnableSink, you will need to load the configuration using PBMx.

Unfortunately, we do not have drivers for this. We do have instructions on how to do PBMx on I2C1 line in the TRM and I can provide example log for this process.

Regards 

so you mean without EEPROM i can still load the configuration using PBMx to NegotiateHighVoltage, right?

it will be very helpful if you can provide me example log for this process, thank you 

thank you for your reply.

i have some confuse about Slave address when i do the PBMs 4cc.

1. i find some possible Slave address like 0x50(used for EERPOM, but i haven't EEPROM, i use MCU)

2. Slave address like 0x21 (but it is the address selected by ADCINx pins. in PBMs, it is not valid)

3. Slave address like 0x30 (it appear in Patch Bundle Mode Walkthrough ppt).

so i dont know which Slave address is correct ? and i try this 3 addresses, 0x50 and 0x30 return success, ox21 return Invalid slave address.

after that i think i need use GUI to generate and write low region binary data to Slave address, but fail.

i find similar question in https://e2e.ti.com/support/power-management-group/power-management/f/power-management-forum/1345657/tps25750-how-to-configure-on-mcu/5196149?tisearch=e2e-sitesearch&keymatch=tps25750%2520%2522slave%2520address%2522#5196149 but not very clear. 

hope to hear from you.

Hi,

0x50 should be fine to use on I2C1 as long as that I2C line does not go to device's I2C3.

Address 0x30 should be treated as a communication channel for the data to pass from EC to PD. You can use any address for this channel as long as this is not the port slave address or used by other components tied on I2C1 line

Regards

Hi, sorry to be late.

You are correct, now i am in "APP " mode.

But depend on my original target, i want it turn into NegotiateHighVoltage and charge 20V. but dont know which register i need change.

1. maybe i need change 0x33 TX_SINK_CAPS Register ? (because i use a power sink only) or need modify GUI?

2. dose in "APP " mode mean in NegotiateHighVoltage mode?

3. i read 0x2D ,0x26 and 0x33 register

It will be very helpful if you tell me something. Thank you.

Hi,

Based on 0x2D read the appconfig is loaded from I2C so I believe the PBMx process is done correctly.

Now if you want to change the sink capability you will need to change the TX sink cap register in the GUI and load the new appconfig to PD.

A good way to check is use a PD controller and check if the 20V contract is established or not.

Regards

Hi,

i try some GUI settings like 

{
"questionnaire": {
"device": "TPS25750",
"answers": [null,6,4,4,1,0,3,0,1,1,0,3,0.05,0.04,0.04],
"vendorId": "0000",
"productId": "0000",
"version": "1.0.0.2"
}
}

and 

{
"questionnaire": {
"device": "TPS25750",
"answers": [null,7,4,4,1,0,3,3,1,1,0,3,0.05,0.04,0.04],
"vendorId": "0000",
"productId": "0000",
"version": "1.0.0.2"
}
}

but still cant get 20V from PPHV (now is 5V).

i can show the process step:

step1. in "APP " mode

step2. cmd 'DBfg'

step3. read register 0x29, 0x1A, 0x40, 0x2D, 0x3F

(i try) step4. write cmd 'SWSk' but return 0x03 Task rejected

my questions are:

1. Do i need use cmd 'SWSk' ( i use power sink only), or just change GUI to receive my 20V PPHV target?

2. i find similar question in https://e2e.ti.com/support/power-management-group/power-management/f/power-management-forum/1342862/tps25750-cannot-act-as-a-source-after-dead-battery-flag-is-cleared/5135575?tisearch=e2e-sitesearch&keymatch=TPS25750%252525200x1a#5135575 

but from my 0x3F, there is no connection, so i am confused about this solution :

If the DBfg 4CC command is sent before the USB sink is connected, the problem does not occur, and register 0x1A is updated normally.

Best regards

Hi,

Can you zip your .json project so I can take a look at your setting?

From the snippet you copied it seems like you you did not enable the advance configuration to edit the sink cap register.

SWSk can be rejected if PD is already in sink mode.

Regards 

Hi,

i did not enable the advance configuration and the setting .json are attached below.

config1,2,5,6 can run to "APP " but only run 1 time, cant read any register, and then the whole STM32 out of power.  PPHV read 5V ->0V

config3,4 can run to "APP " and i have provided the situation 

wang alyssa said:

i can show the process step:

but i use BQ25798 (cant select it in GUI) and BQ are not connect to TPS25750 I2Cs.

so i think this sink only is in my needs.

Let me give more detail about hardware layout:

(pin8,9)I2Cs_SDA and I2Cs_SCL ----STM32 I2C4

(pin16,17)I2Cm_SDA and I2Cm_SCL ----hold on

(pin20,21,22)PPHV -----provide 20V voltage for 6x BQ25798

(pin38)VIN_3V3 ----provide 3.3V voltage for STM32 

(pin23,24,25,32,33)VBUS_IN and VBUS ----STM32 ADC for read voltage

Best regards

config1-6.zip

Hi,

You are correct that is the correct option to choose.

Can you provide the schematic?

Can you try creating the binary using this GUI and see if it helps?

https://dev.ti.com/gallery/view/USBPD/TPS25750_Application_Customization_Tool/ver/7.0.4/

Regards

Hi,

now i use this .json (attached below) run into "APP "mode. Schematic also attached below.

But still cant use type-c to charge. (battery only 5V is OK, battery have 5V, 9V, 12V is fail)

the battery type-c input: 5V--2.4A, 9V--2A, 12V--1.5A . I have written them in GUI advance configuration 0x33.

i wonder what will happen if everything is correct and run into "APP " mode? will >5V type-c can charge?

I follow the code https://github.com/jerpeter/MS9300/blob/d980d1b3649480dafbb074656526ec9aeb630ab3/UsbPortController.c#L57 --> tps25750_init(struct tps25750 *tps) function.

Best regards

Schematic+json.zip

Hi,

Do you have a PD analyzer that can collect PD log for me to check if there was contract negotiation? Seeing contract negotiation is a good way to tell if PD FW is correctly loaded or not.

Regards