query regarding usb hub

[chetang91]

i am using CY4609 reference design kit. i  configured it on apple charging 2.1 A,  but after connecting iPhone7 to this kit, it is only charging with 0.90 Amp. now i am connecting iphone 7 with the other Vendor's USB HUB this shows 1.66 Amp charging current. why i am facing such problem, please help me ? i am attaching snaps of charging current measurement for both the situation.

 

 

[Sananya_14]

Hello,

Please ensure that the VBUS_DS pin connection is set to 5V on the kit. If you're using the kit with I2C EEPROM mode, please check if the Apple charging current limit is set to 2.1A in the Blaster Plus settings.

It is recommended to test when the connected phone has low charge because the current consumption will be determined by the phone even if HX3 can support upto 2.1A.

Please also probe the Dp/Dm voltage levels if you still see that the charging is at a lower current to confirm if the port is in Apple charging mode.

Best Regards,
Sananya

[chetang91]

i measured voltage of D+ and D- point of USB Port (with connecting IPhone 7 device ). It shows 2.6 v for D+ and shows 1.5 v for D-  and charging current is 1.12 Amp. why this is not charging with a current near of 2.1 amp ?

 

[Sananya_14 · Accepted solution]

Hello,

It seems that the port is not in 2.1A Apple charging mode since the D+ voltage should be within 2.55V and 2.81V, and D- voltage should be within 1.9V and 2.1V. Please refer to the App Note for configuring HX3 for 2.1A Apple charging mode. Please also review the jumpers settings from section 3.1 in the CY4609 User Guide.

Best Regards,
Sananya