Apparatus and method for detecting and powering an accessory

Details Apparatus and method for detecting and powering an accessory Apparatus and method for detecting and powering an accessory

1997-12-05

2000-03-14

Tsang, Fan S.

Telecommunications

Transmitter and receiver at same station

Radiotelephone equipment detail

455569, 455572, H04Q 732

Patent

active

060384573

ABSTRACT:
A radiotelephone (100) is coupled to accessory (200) by way of a novel interface provided by connector (190). Accessory (200) is a headset including a microphone (220) and a speaker (230) that may be plugged into a jack in radiotelephone (100) and worn by the user. Accessory (300) provides an RS-233 serial interface for communicating information between radiotelephone (100) and a personal computer (400). Controller (130) of radiotelephone (100) detects the presence of a 10K ohm resistor (202) to determine that accessory (200) is coupled to connector (190), and the presence of a 22K ohm resistor (202) to determine that accessory (300) is coupled to connector (190). When accessories (200) and (300) are detected, a liner regulator (116) is swathed on by controller to provide a 2.7V voltage source for powering accessories (200) and (300).

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