System and method for dynamically allocating inter integrated circuits addresses to multiple slaves

A method for dynamically allocating inter integrated circuits (I2C) addresses to multiple slaves attached to a host having an I2C bus, the method comprising the steps of:

• providing and initializing a count variable “i;”
• setting an I2C signal of an output pin of a slave to “0;”
• delaying a first time;
• calculating the count variable “i;”
• determining whether the I2C signal value of an input pin of the slave is equal to “1;” and
• regarding the value of the count variable “i” as an I2C address of the slave, if the I2C signal value of the input pin of the slave is equal to “1”.

A system for dynamically allocating inter integrated circuits (I2C) addresses, comprising an I2C address allocating program installed in a processor of each slave, wherein a plurality of the identical slaves are cascaded one by one and one of the slaves is connected to a host via an I2C bus, and the I2C address allocating program comprises:

• a signal setting module for setting an I2C signal value of an input pin of each slave, and checking the I2C signal value of an output pin of the slave;
• a delay controlling module for controlling a synchronous booting error time for each slave, and setting a security time for allocating a unique I2C address to the slave;
• and
• an I2C address calculating module for calculating the unique I2C address for each slave, and obtaining a corresponding I2C address from the host.