Combined data/power supply cable for mobile phones
Original Publication Date: 2002-Sep-01
Included in the Prior Art Database: 2003-Jul-23
Current consumption during long data transfer has a main impact on battery life when the phone’s power supply is not connected to the data cable. Until now there are some cables that have a separate plug in the data cable to connect the mobile’s power supply but usually the communication is serial and slow and some modified Universal Serial Bus (USB) cables to use the power supply from a PC, but these cables only supply an emergency power supply but no data exchange capability.
Information / Kommunikation
Combined data/power supply cablefor mobile phones
Idee: Thomas Stichelbout, DK–Aalborg
Current consumption during long data transfer has amain impact on battery life when the phone’s powersupply is not connected to the data cable. Until nowthere are some cables that have a separate plug in thedata cable to connect the mobile’s power supply butusually the communication is serial and slow andsome modified Universal Serial Bus (USB) cables touse the power supply from a PC, but these cablesonly supply an emergency power supply but no dataexchange capability.
That’s why it is suggested to use a data cable with aproprietary connector on the mobile side which isconnected to a PC’s USB port. The baseband proces-sor in the mobile phone has to run a USB protocol,but the power supply from the PC is switched tocharge the mobile battery. Typically the currentprovided by charger in a mobile is 650mA which isnear the 500mA specified for the USB current on asingle port.
Corresponding to the USB specifications (figure 1)the pinning of the cable on the mobile side is thefollowing: Pin 1 is connected to Vcc of the powermanagement unit (PMU). Pins 2 and 3 (-/+ data) areconnected to baseband. Pin 4 is connected to theground plane.
Fig. 1: USB pinning
All the communication to the mobile phone goesthrough these cables without the need for extrahardware between the PC and the phone. Part of thememory in the mobile phone ca...