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http://dx.doi.org/10.5207/JIEIE.2012.26.6.087

A Design of Effective Analog-to-Digital Converter Using RC Circuit for Configuration of I2C Slave Chip Address  

Lee, Mu-Jin (영남대학교 전자공학과)
Seong, Kwang-Su (영남대학교 전자공학과)
Publication Information
Journal of the Korean Institute of Illuminating and Electrical Installation Engineers / v.26, no.6, 2012 , pp. 87-93 More about this Journal
Abstract
In this paper, we propose an analog-to-digital converter to set the address of a I2C slave chip. The proposed scheme converts a fixed voltage between 0 and VDD to the digital value which can be used as the address of the slave chip. The rising time and the falling time are measured with digital counter in a serially connected RC circuit, while the circuit is being charged and discharged with the voltage to be measured. The ratio of the two measured values is used to get the corresponding digital value. This scheme gives a strong point which is to be implementable all the parts except comparator using digital logic. Although the method utilizes RC circuit, it has no relation with the RC value if the quantization error is disregarded. Experimental result shows that the proposed scheme gives 32-level resolution thus it can be used to configure the address of the I2C slave chip.
Keywords
I2C; Chip Configuration; ADC; LED BLU Drive Circuit;
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