METHOD AND APPARATUS FOR CONTROLLING ACCESS TO A LOGIC CIRCUIT IN A BATTERY BY MULTIPLE COMPONENTS CONNECTED TO THE BATTERY

摘要

A method and apparatus for controlling access to a logic circuit in a battery by one or more components connected to the battery includes the components initially providing no voltage to a data contact, and sampling a voltage level at the data contact to determine if another component is presently connected to the logic circuit. When the sampled voltage indicates no other component is presently accessing the logic circuit, the component applies a voltage to the logic circuit via the data contact and access the logic circuit. When the sampled voltage indicates that a prior-connected component is connected to the battery, the component uses a voltage level provided by the prior-connected component to access the logic circuit.

主权项

1. A method for interacting with a data line in a battery by a component connected to the battery, comprising:
setting a high side switch that is electrically in series with a pull up resistance between the data line and a voltage source in the component, and physically located in the component, to a normally open state; setting a low side switch that is electrically in series with a pull down resistance between the data line and an electrical ground in the component, and physically located in the component, to a normally closed state; sampling a present voltage level of the data line while the high side switch is in an open state and the low side switch is in a closed state; and when the present voltage level is substantially equal to the electrical ground, closing the high side switch and opening the low side switch.