TUSB8044A: TUSB8044AIRGCR || by default configuration without I2C OR EEPROM TO ENBLE 4 USB(DOWNSTREAM)

RAHUL RAI

Part Number: TUSB8044A

Hi Team,

We are using the USB Hub TUSB8044AIRGCR in our design. I am unable detect USB and 5V enable. Please see the attached schematic for reference.

Below is a query:: -

1. Does the USB hub require configuration through I2C to enable the hub??

2. Is that any by-default configuration without i2c or eeprom to detect the 4 USBs (downstream)?. (if it is possible, please share documents .)

I am looking for your positive response.

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Thanks & Regards

RAHUL RAI

Sr. Hardware Engineer (R&D)

+919667738712 | rrai@iotechworld.com

IoTechWorld Avigation Pvt Ltd

Plot No. 31,34 Sector 35

Gurgaon, Haryana 122004

0 Brian Zhou over 2 years ago

Hi Rahul:

TUSB8044A should be able to detect downstream port devices in default setting without external EEPROM or SMBUSz configuration changes.

Can you upload schematic again?

Regards

Brian

0 RAHUL RAI over 2 years ago in reply to Brian Zhou

0 Brian Zhou over 2 years ago in reply to RAHUL RAI

Hi Rahul:

I'm working on schematic review and will send my comment by next Monday.

Regards

Brian

0 Brian Zhou over 2 years ago in reply to Brian Zhou

Hi Rahul:

Can you remove R13 pulldown resistor on SMBUSz and see any difference?

Did crystal oscilating ?

Regards

Brian

0 RAHUL RAI over 2 years ago in reply to Brian Zhou

REMOVE R13 PULLDOWN Now it is working. I am able to detect port

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