One-wire device with A-to-D converter
AssigneeDallas Semiconductor Corporation
InventorJames P. Cusey
Life of this patent
Estimating the term…
Abstract
A low power integrated circuit having analog to digital conversion circuitry capable of receiving a plurality of analog signals and converting them to a digital value. The digital value is then transmitted, upon request, over a single wire bus. The accuracy of the analog to digital conversion circuitry can be calibrated via trim codes stored in an onboard EPROM.
Claims12
An integrated circuit for converting an analog signal to a digital signal and providing said digital signal to a host device via a single wire data bus, said integrated circuit comprising:
- input/output circuitry for connecting to said single wire data bus;
- analog to digital conversion circuitry for providing a digital signal to said input/output circuitry;
- an analog input for connecting an analog signal source and for providing an analog signal to said analog to digital conversion circuitry;
- a non-volatile memory for storing trim codes for calibrating said analog to digital conversion circuitry;
- and
- a memory device connected to the non-volatile memory, said memory device for storing a multibit conversion resolution indicator, said multibit conversion resolution indicator for controlling a conversion resolution of said analog to digital conversion circuitry;
- wherein said integrated circuit is operable parasitically from said single wire data bus and wherein said integrated circuit further comprises a unique address.
An analog to digital converter comprising:
- at least one analog input for receiving an analog signal from an external analog signal producing device;
- an analog to digital conversion circuit;
- a memory device connected to the analog to digital conversion circuit, said memory device for storing at least three conversion resolutions;
- means for connecting said at least one analog input to said digital conversion circuit;
- a plurality of registers for storing an output of said analog to digital conversion circuit wherein said output corresponds to one of said at least three conversion resolutions;
- and
- input/output circuitry for retrieving said output of said analog to digital conversion circuit and providing said output to a single wire bus;
- wherein said analog to digital converter is powered parasitically from said single wire bus and wherein said integrated circuit further comprises a unique address.
An integrated circuit for converting a first and a second analog signal to a digital signal and providing said digital second to a host device via a single wire data bus, said integrated circuit comprising:
- input/output circuitry for connecting to said single wire data bus;
- analog to digital conversion circuitry for providing said digital signal to said input/output circuitry;
- a first analog input for receiving said first analog signal and for providing said first analog signal to said analog to digital conversion circuitry;
- a second analog input for receiving said second analog signal and for providing said second analog signal to said analog to digital conversion circuitry;
- a first memory location associated with said first analog input, said first memory location for storing a first plurality of bits indicative of a first conversion resolution;
- and
- a second memory location associated with said second analog input, said second memory location for storing a second plurality of bits indicative of a second conversion resolution;
- wherein said analog to digital conversion circuitry is configured to utilize said first conversion resolutions responsive to conversion of said first analog signal to said digital signal and wherein said analog to digital conversion circuitry is configured to utilize said second conversion resolution responsive to conversion of said second analog signal to said digital signal and wherein said integrated circuit further comprises a unique address.
Dependencies are inferred from the claim text.