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Combined data/power supply cable for mobile phones

IP.com Disclosure Number: IPCOM000018534D
Original Publication Date: 2002-Sep-01
Included in the Prior Art Database: 2003-Jul-23
Document File: 1 page(s) / 159K

Publishing Venue

Siemens

Related People

Thomas Stichelbout: AUTHOR

Abstract

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.

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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...