BQ25792EVM: Non standard adapter recognition

Hello Stefano,

The charger follows the USB Battery Charging Specification 1.2 (BC1.2) to detect SDP/CDP/DCP/HVDC input sources and the non-standard adapters through the USB D+/D- lines.

Stefano Sivera said:

I'm checking the capability of USB detection of the 25792. I would check the non standard adapter that can be find on the market but I do not recognize if an adapter is copatible or not. Cna you help me for identify non standard adapter ? 

I'm confused on the question. Are you asking what a non standard adapter is or are you asking what non standad adapters work with this detection?

Best Regards,

Christian.

Hi Christian,

my customer request a battery charger compatible with most commont USB adapter available on the market and I need demostrate this.

For BC1.2 is not a problem because all  available USB adapter are compoetible with this specification but the limit of the standard is 1,5 A.

I need charge the battery with 2A then I need buy some adapter to demostrate that can be used with most common adapter availabel on the market .

I need demostrate that is compatible with Sansung and Apple USB power adapter but on the specification of the power adapter is not signed "non standard compatible" how can understant if a power adapter is compliant with the requirement of D+/D- handshake voltage.

 If I buy a 2,4A power adapter for Samsung or Apple, applied it the volage on D+ D-  pin ?

Thank you 

Best Regards

Stefano

Hello Christian,

the power adapter is compliant. As you can see in the waveform attached the wire D+ and D- are pulled at 2,65V this mean both within V2p8_VTH; in this case this power supply must be recognized as non standard Divider4 (2,4A) instead are recognized as DCP 3-25A.

Best Regards

Stefano

Hello Stefano,

Is this cable plugged into a wall outlet?

Best Regards,

Christian.

Hi Christian,
this is a USB cable connected to USB mains adapter, obviously connected into wall outlet but I think that I misundertand the question; obviously I am using a working  USB adapter that is capable to charge a mobile phone with high current.

Rather confirm these points that maybe we will have an answer, please.

The USB autodetection is operative on BC1.2 and in the same time also on non-standard adapter ?
What is start first BC1.2 or non standard ?
If the BC1.2 is started first, and compleated successfully, at the end start also the non standard detect ?
Whats happen if the USB adapter connector is arranged like this :

What do you think ?

Thank you

BR Stefano 

Hello Stefano,

Stefano Sivera said:

What is start first BC1.2 or non standard ?

BC1.2 detection is started first.

Stefano Sivera said:

If the BC1.2 is started first, and compleated successfully, at the end start also the non standard detect ?

If BC1.2 is completed and the device detects a SDP/CDP/DCP, The device will go into secondary detection. There is no need to go into Non-standard Adpater detection, if the device already detects SDP/CDP/DCP.

The adaptors are not manufactured by us. I recommend checking with vendors if you are looking for a non-standard adaptor.

Best Regards,

Christian.

Hello Christian,

Christian Moyer said:

There is no need to go into Non-standard Adpater detection, if the device already detects SDP/CDP/DCP.

As I write, I need charge at 2A. If the USB adapter is capable of 2,4A but it is recognized as DCP I can only draw 1,5A  I cannot use the max available power . 

Christian Moyer said:

The adaptors are not manufactured by us. I recommend checking with vendors if you are looking for a non-standard adaptor.

I've check 12 USB adapter an all have the same beavioure : it are capable of 2,4A but are recognized as DCP and in this case I cannot use 2,4A. All the USB adapter have the D+ D- data line at 2,7V bat is not recognized as Divider 4.

The problem is not the USB adapter, the problem is D+ D- detection. why is not correctly detected ? I need chage some BQ configuration ?

UPDATE: R1+R2 < 200 ohm

Thank you

Best Regard

Stefano

Hello Stefano,

I'm gathering more information on this issue, I will provide an update after I gather more information.

Best Regards,

Christin.

Hello Stefano,

Can you provide your register values?

Can you provide your schematic?

Best Regards,

Christian.

Hello Christian,

atteched my default register BQ25792_Default.zip

About the schematic, as I write in my subjet I'm using the EVB.

Thanks and BR

Stefano 

Hello Stefano,

Thank you for this information, I'm reviewing your register values and will provide an update after I gather more information.

Best Regards,

Christian.

Hello Christian,

obviously JP10 is not shorted I saw the schematic before open the issue and this is very simple error to discover.

Christian Moyer said:

Input Current Issue: The BQ25798 is detecting the adapter as USB DCP-3.25A, So IINDPM should be set to 3.25A. However the ILIM_HIZ pin is clamping the current around 1400mA. The only way around this is to change the resistor divider on the ILIM_HIZ pin or disable ILIM pin in register 14.

Is a wrong definition of the issue.

The issue is:

The BQ25798 with autodetect active are able to detect only in BC1.2 standard. If I use a non standard USB adapter with D+D- voltage at V2p8 voltage it is not recognized as Non Standard adapter with Divider4, Same issue if I use a HVDCP USB power adapter it is recognized as DCP-3,25.

On the data sheet is write:

". In addition, when USB DCP is detected, the charger initiates adjustable high voltage adapter handshake on D+/D- if HVDCP detection is enabled by the host. The input type might be changed after HVDCP detection is completed."

I set EN_HVDCP=1 but I haven't see any handshake on the bus.

This the issue that I find on EVB.

Thank You 

Best Regards

Stefano

Hello Stefano,

Can you provide the setup of the EVM, I want to check which jumpers are populated. Providing a picture of the setup would be best.

I'm going to try and replicate this in the lab. 

Best Regards,

Christian.

Hello Christian, attached the picture. Have you replicated the test?  Can you tell me wath's happen ?

Thank You 

best regards

Stefano

Hello Stefano,

Can you explain your setup? What is attached to PMID? Are you using J6 as the input?

Do you have a link to the adapter you are using?

Have you tried using a different board in case this one is damaged?

I tried replicating in the lab with 7.6V battery and non standard adapter of 5V/1A. I was able to detect non standard adapter, using the same EVM setup

Best Regards,

Christian,

Hello Christian,

VPIMID is a load resistor, I’m not into laboratory and now I am simulate the load with resistor

Battery is connected to the terminal block and the externa power supply is only connected to J6 connector.

These are some of the power supply used:

https://shop.ansmann.de/en/home-charger-hc430-black

https://www.mondonotebook.it/it/caricabatterie-cellulari-tablet-ultrabook/49630-caricatore-usb-da-muro-a-3-porte-ravpower-30w-5v-6a-con-output-massima-fino-a-24a-compatto-per-iphone-ipad-huawei-samsung-galax.html

https://www.amazon.it/dp/B0773HDJYM?psc=1&ref=ppx_yo2ov_dt_b_product_details

I my laboratory I have also other PS that I used; tomorrow I will send you the P/N.

This is the only board that I have.

You setup is not correct to see the issue:

• The external power supply cannot workig with D+D- autodetect
• Your USB adapter cannot complete the DCP decoding becuse the current is lower of 1.5Amp°; try to use a power supply of 2,4Amp  

Thank You 

Best Regard

Stefano

Hello Stefano,

Stefano Sivera said:

Your USB adapter cannot complete the DCP decoding becuse the current is lower of 1.5Amp°; try to use a power supply of 2,4Amp  

Yes, I used 5V/2.4A

I removed J14 and added J21. VBUS status reports Non-standard adapter, and IINDPM is set to 2400mA

I used standard 5V/2.4A adapter from Apple.

In your register file, ADC(V+) and ADC(V-) read 0mV, are you able to enable these?

In your scope capture V+/V- go up to 2.6V, then to around 1V then back up to 2.6V. Do you see the same results with all adapters

Best Regards,

Christian.

Hello Christian,

Below my test witn Hansmann (2,4A) power supply

- removed JP14 and added JP21
- EN Charrge, EN auodetect, EN ADC selected, EN OTG deselected IINDPM=3250, Charge current=500mA
- Plug in the power supply 
- VBUS Status=USB DCP 3.25A 
- ADC+D=2649mV, ADC-D=2648mV, IINDPM=3250mA 
- Do not start the charge

Christian Moyer said:

In your register file, ADC(V+) and ADC(V-) read 0mV, are you able to enable these?

My registers are saved with USB power removed, I I use a non standard 2,4Amp I see 2,6V

Christian Moyer said:

In your scope capture V+/V- go up to 2.6V, then to around 1V then back up to 2.6V. Do you see the same results with all adapters

This transition is performed during autodetection.

With the J21 inserted the ILIM is not active by HW but with EN_EXTILIM I can also disable by SW ; It is correct ?

If I enable the OTG Mode the autodetect and charge do not start; it is correct ?

BR

Stefano 

Hello Stefano,

Stefano Sivera said:

With the J21 inserted the ILIM is not active by HW but with EN_EXTILIM I can also disable by SW ; It is correct ?

Yes, You can disable ILIM by setting REG0x14[1]=0.

Stefano Sivera said:

If I enable the OTG Mode the autodetect and charge do not start; it is correct ?

Charging should start when the conditions are met. If OTG is enable, and adapter is plugged in, the OTG bit should reset to zero.

Have you tried setting REG0x11[7]=1 to force an +/-D detection after adapter is plugged in?

Best Regards,

Christian.

Hi Christian, any news from your check?

Best Regards

Stefano

Hello Stefano,

I spoke with another team who has seen similar issue in the past, We think the issue is related to the adapters you are using. I 

I recommend using the Apple 5V/2.4A adapter, I have tested using this adapter and can confirm the BQ25792 will detect this as a non standard adapter.

Best Regards,

Christian.

Hello Christian.

Christian Moyer said:

I spoke with another team who has seen similar issue in the past

We have discuss for 26 days for understand that is a know problem... great !!!

Christian Moyer said:

We think the issue is related to the adapters you are using

Is not related to my adapter, it is related to your BQ25792 algorithm detection, becaure 10 power supply tested have the same issue; this mean that you need write on the data sheet "Compatible with Apple power supply .... and no one else"

Christian Moyer said:

I recommend using the Apple 5V/2.4A adapter,

Than I need write on the user manual of my product that is only compatible with Apple 2,4A adapter hoping it won't be taken out of production, because now the standard is moving to higher current (PD or QC) ; It doesn't seem like a good presentation of the product to me.

I'm afraid to start testing with with HVDCP adapter.

I am using TI component from 30 years and I had always been satisfied with the components and customer service but in these finaò 3 year are very disastrous experience.

You are not the cause of this problem because you are doing the best possible but the is the cause of TI misorganization.

Thank you 

Regards

Stefano