StarTech.com ST7CU35122 - Manual (Page 7)

Instruction Manual
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Apple Mode definition:
Apple Mode is a proprietary charging mode developed by Apple, which redefines
the other two pins of the USB connector, enabling them to send current and increase
charging speed (same theory as DCP mode in BC 1.2 version, but with different voltage
levels on the pins).
Detailed as follows:
1A Mode: VCC:5V/GND:5V/D+:2.0V/D-:2.7V (compatible with Apple products that need
1A current input, such as iPhones, IPods and iPads)
2A Mode: VCC:5V/GND:5V/D+:2.7V/D-:2.0V (compatible with Apple products that need
2A current input, such as iPads or iPad minis)
BC 1.2 Mode ( Battery Charging Specification 1.2) definitions:
SDP: Standard Downstream Port, defined under USB 2.0 & 3.0 specification. Charging
limits: 500mA / USB 2.0; 900mA/USB3.0
DCP: Dedicated charging Port, for charging only. To increase charging efficiency in DCP
mode, D+ and D- will short out and cannot transmit data. **ST7CU35122 uses this mode
only.
CDP: Charging Downstream Ports. USB ports under this mode can transmit data.