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IEEE Trans Biomed Eng · Apr 2005
A system-on-chip digital pH meter for use in a wireless diagnostic capsule.
- Paul A Hammond, Danish Ali, and David R S Cumming.
- Department of Electronics and Electrical Engineering, University of Glasgow, Glasgow G12 8LT, UK. p.hammond@elec.gla.ac.uk
- IEEE Trans Biomed Eng. 2005 Apr 1; 52 (4): 687-94.
AbstractThis paper describes the design and implementation of a system-on-chip digital pH meter, for use in a wireless capsule application. The system is organized around an 8-bit microcontroller, designed to be functionally identical to the Motorola 6805. The analog subsystem contains a floating-electrode ISFET, which is fully compatible with a commercial CMOS process. On-chip programmable voltage references and multiplexors permit flexibility with the minimum of external connections. The chip is designed in a modular fashion to facilitate verification and component re-use. The single-chip pH meter can be directly connected to a personal computer, and gives a response of 37 bits/pH, within an operating range of 7 pH units.
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