Low power grating detection system chip for high-speed low cost length and angle precision measurement

Ligang Hou; Rengui Luo; Wuchen Wu

doi:10.1117/12.715246

13 October 2006 Low power grating detection system chip for high-speed low cost length and angle precision measurement

Ligang Hou, Rengui Luo, Wuchen Wu

Proceedings Volume 6280, Third International Symposium on Precision Mechanical Measurements; 628004 (2006) https://doi.org/10.1117/12.715246
Event: Third International Symposium on Precision Mechanical Measurements, 2006, Urumqi, China

Abstract

This paper forwards a low power grating detection chip (EYAS) on length and angle precision measurement. Traditional grating detection method, such as resister chain divide or phase locked divide circuit are difficult to design and tune. The need of an additional CPU for control and display makes these methods' implementation more complex and costly. Traditional methods also suffer low sampling speed for the complex divide circuit scheme and CPU software compensation. EYAS is an application specific integrated circuit (ASIC). It integrates micro controller unit (MCU), power management unit (PMU), LCD controller, Keyboard interface, grating detection unit and other peripherals. Working at 10MHz, EYAS can afford 5MHz internal sampling rate and can handle 1.25MHz orthogonal signal from grating sensor. With a simple control interface by keyboard, sensor parameter, data processing and system working mode can be configured. Two LCD controllers can adapt to dot array LCD or segment bit LCD, which comprised output interface. PMU alters system between working and standby mode by clock gating technique to save power. EYAS in test mode (system action are more frequently than real world use) consumes 0.9mw, while 0.2mw in real world use. EYAS achieved the whole grating detection system function, high-speed orthogonal signal handling in a single chip with very low power consumption.

Citation Download Citation

Ligang Hou, Rengui Luo, and Wuchen Wu "Low power grating detection system chip for high-speed low cost length and angle precision measurement", Proc. SPIE 6280, Third International Symposium on Precision Mechanical Measurements, 628004 (13 October 2006); https://doi.org/10.1117/12.715246

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KEYWORDS

LCDs

Clocks

Sensors

Data processing

Signal detection

Interfaces

Precision measurement

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