Address selection for an I2C bus
AssigneeSTMicroelectronics Maroc
InventorAbdelouahid Zakriti
Life of this patent
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Abstract
An address configuration circuit and a method for sharing a series bus connected to a first device between two secondary devices by a configuration within each secondary device of a different address, including, in a configuration phase, the temporary configuring of an output terminal of each secondary device in a mode of reading of the voltage present on this terminal to select one address out of two within the device.
Claims21
A method for sharing a series bus, connected to a first device and to two secondary devices, by a configuration within each secondary device of a different address, comprising, in a configuration phase, temporarily configuring an output terminal of each secondary device as an input terminal in a mode of reading of the voltage present on this terminal to select one address out of two within the secondary device, and delaying, by a first time period, a taking into account of the voltage present on the output terminal with respect to a start time of the configuration phase.
A circuit for configuring the address of a device connectable to a series bus, comprising means for temporarily configuring an output terminal of the device as an input terminal having its state compared with a threshold, and means for exploiting a result of this comparison to select one address out of two for the device, comprising at least one first time counter to delay, by a first time period, the taking into account of said comparison with respect to a start time of a configuration phase.
A method for configuring an address of a device, comprising:
- configuring an output terminal of the device to function as an input terminal in a configuration phase;
- sensing a state of the output terminal in the configuration phase;
- and
- selecting an address in response to the sensed state of the output terminal in the configuration phase, wherein selecting an address includes delaying, by a first time period, a taking into account of the state of the output terminal with respect to a start time of the configuration phase.
Apparatus for configuring an address of a device, comprising:
- a first circuit to configure an output terminal of the device to function as an input terminal in a configuration phase;
- a second circuit to sense a state of the output terminal in the configuration phase;
- and
- a third circuit to select an address in response to the sensed state of the output terminal in the configuration phase, wherein the second circuit comprises a comparator for comparing a voltage on the output terminal with a threshold voltage, and wherein the third circuit comprises a first counter to delay, by a first time period, the selection of an address with respect to a start of the configuration phase.
Dependencies are inferred from the claim text.