Telecommunication apparatus comprising a peripheral recognition device
First Claim
1. A telecommunication apparatus having power supply terminals for supplying power to a peripheral which has an electrical signature, and a recognition device for recognizing a peripheral connectable between the power supply terminals, the electrical signature being formed by an impedance of said peripheral seen between said terminals, said recognition device comprising measuring means for measuring said impedance when said peripheral is connected to said terminals, and automatic selection means for selecting a supply voltage for applying to said peripheral, said supply voltage being a function of said measured impedance.
1 Assignment
0 Petitions
Accused Products
Abstract
A main apparatus has power supply terminals for supplying power to a peripheral and a recognition device for recognizing various types of peripherals by simply connecting said peripheral between said terminals and for selecting a power supply voltage as a function of the impedance of said peripheral between these terminals.
-
Citations
9 Claims
- 1. A telecommunication apparatus having power supply terminals for supplying power to a peripheral which has an electrical signature, and a recognition device for recognizing a peripheral connectable between the power supply terminals, the electrical signature being formed by an impedance of said peripheral seen between said terminals, said recognition device comprising measuring means for measuring said impedance when said peripheral is connected to said terminals, and automatic selection means for selecting a supply voltage for applying to said peripheral, said supply voltage being a function of said measured impedance.
-
3. A telecommunication apparatus having power supply terminals for supplying power to a peripheral which has an electrical signature, and a recognition device for recognizing a peripheral connectable between the power supply terminals, the electrical signature being formed by an impedance of said peripheral seen between said terminals, said recognition device comprising measuring means for measuring said impedance when said peripheral is connected to said terminals, comparing means for comparing said measured impedance with reference values, and switch means for selecting a supply voltage for applying to said peripheral, said supply voltage being a function of said comparing.
-
4. An apparatus comprising:
-
a power supply providing a plurality of selectable supply voltages; power supply terminals for providing a supply voltage to a peripheral device, said peripheral device having an electrical signature formed by an impedance seen between said power supply terminals when said peripheral device is connected to said power supply terminals; a recognition and voltage selection device configured to recognize whether said peripheral is connected to said power supply voltage terminals through measurement of said impedance, and to select a selected one of said plurality of selectable supply voltages as said supply voltage. - View Dependent Claims (5, 6, 7, 8, 9)
-
Specification