Methods and Apparatus for Setting the Address of a Module Using a Voltage
AssigneeLexmark International, Inc.
InventorsJames Ronald Booth, Adam J. Ahne
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Abstract
A method of operating a module is disclosed. The method includes determining if a voltage between a power connection and a ground connection exceeds a predetermined threshold and if so determined then setting a module communication address to a first address, responding to a first serial communication received via the serial communication connection addressed to the module communication address, and not responding to a second serial communication received via the serial communication connection addressed to a different address than the module communication address. Other methods and devices are disclosed.
Claims19
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A method of operating an authentication module having a power connection, a ground connection, an I2C clock connection, and an I2C data connection, the method comprising:
- generating an operating voltage source from the power connection;
- powering an authentication circuit from the operating voltage source;
- setting a module communication address based on the magnitude of a DC voltage on the power connection;
- receiving via the I2C clock connection and the I2C data connection a first command addressed to the module communication address;
- and
- responding to the first command,
- wherein the operating voltage is lower than the DC voltage on the power connection.
An authentication module comprising:
- a power connection;
- a ground connection;
- an I2C clock connection;
- an I2C data connection;
- and
- an authentication circuit having an address input node coupled to the power connection through a voltage attenuator, the authentication circuit is coupled to the I2C clock connection, the I2C data connection, and the ground connection, the authentication circuit is configured to perform an authentication procedure and is configured to set its I2C address based on a voltage on the address input node,
- wherein the authentication circuit is configured to set a bit of its I2C address independent of the voltage on the address input node.
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Dependencies are inferred from the claim text.