TUSB320: I2C programming issue

That is strange .. the manual states 0x67 address, I will try 0x61 ..

Actually I am not sure this chip is the correct one for my needs anyway .. 

I thought the TUSB320 supported Power Delivery .... but it seems from comments elsewhere in the forum, that it doesn't. The datasheet was very confusing on that point as it supports Try.SNK/Try.SRC modes ..

I need to tell a connected USB-C phone to be a host and to accept 3A charge, what TI device would be best for that senario?

Thanks

Hi Malik,

My requirments are as follows:

We have a USB-C phone connected to a USB2 GPS receiver, the Phone needs to be a Host as the receiver is device only. However we need to charge the phone from an external supply at the same time USB connection is going on. This requires the phone to be negotiated to Host/Sink mode, and we need 3A charge.

Is the chip you suggested best for that? And is it easy to program to setup that mode? (we have limited space in the micro we use). Would the TUSB422 be a cheaper option as we already have a power switch and VBUS monitoring from our micro.

We will have I2C interface to the chip as required ..

Regards,

Bernard

Thanks for that .. great.

Can you give some advice on the necessary registers to write to to negotiate(force) the attached phone into DFP+Current sink mode?

(.. and yes, the TUSB420+GPS will be a UFP and supplying charge current to the phone)

At the moment I have the Eval board to experiment with .. and an attached micro to the I2C lines .. 

Cheers

Thanks.

But begs the question: How do I ensure the Phone is a Host in while it is sinking current, won't it try to switch to a device if it sees charging current advertised?

Also in the above register (0Ah) should I not be hitting the SOURCE_PREF [2:1] bits to 11 (Try.SRC), from what you say above you "cannot force" the phone, but isn't this designed to do just that?

To try this out on the EVM board REVB with external power supplied, is there anything else I should be doing to the board to support this mode? (I have SW1 and 5 on, LED3 lights up when phone connected)

Sorry for all the questions.

Cheers,

Bernie

EDIT:

I have the following code:

// TUSB320 Setup
    i2c_data[0] = 0x0a;         // CSR Register
    i2c_data[1] = 0x37;         // Set DISABLE_TERM and DRP mode, and Try.SRC
    i2cPtr->write(addr8bit,i2c_data,2,false); 
    
    wait_ms(10);
    
    i2c_data[0] = 0x0a;         // CSR Register
    i2c_data[1] = 0x36;         // Clear DISABLE_TERM
    i2cPtr->write(addr8bit,i2c_data,2,false); 
    
    i2c_data[0] = 0x08;         // CSR Register
    i2c_data[1] = 0x80;         // Advertize 3A
    i2cPtr->write(addr8bit,i2c_data,2,false);

However, the Phone only charges at 500mA and stays in device mode ..

I can confirm that the chip ACK's every byte sent ..