MOTOROLA MVME147-023 Logic sequence module

The comparator output is undetermined for a period of time after changing an input source or a new reference voltage; this period is referred as the response time. Please refer to Fig. 4-31 and Fig. 4-32 the measurement of comparator responsive time. Typically, the measurement will be based on the compared voltage level near (VDD-1.5)/2. If the compared voltage level is not within the range, the responsive time may be longer.

Using the comparator and band-gap 1.20V 

The internal band-gap module can provide 1.20 volt, it can measure the external supply voltage level. The band-gap 1.20 volt is selected as minus input of comparator and Vinternal R is selected as plus input, the supply voltage of Vinternal R is VDD, the VDD voltage level can be detected by adjusting the voltage level of Vinternal R to compare with band-gap. If N (gpcs[3:0] in decimal) is the number to let Vinternal R closest to band-gap 1.20 volt, the supply voltage VDD can be calculated by using the following equations: For using Case 1: VDD = [ 32 / (N+9) ] * 1.20 volt ;

LCD Bias Voltage Generator

 This function can be enabled by bit 4 of misc register. Those pins which are defined to output VDD/2 voltage are PA3、PA2、PA1、PA0 during input mode, being used as COM function for LCD application. If user wants to output VDD、VDD/2、GND three levels voltage, the corresponding pins must be set to output-high for VDD, enabling VDD/2 bias voltage with input mode for VDD/2, and output-low for GND correspondingly, Fig. 25 shows how to use this function.

                                                                        

Application industry

The products can be used in the following industries: power plant, paper making, steel, mining, rubber, water supply, cement, chemical industry, glass, printing

Textile, machinery, plastics, coatings, medicine, hospitals, food, hotels, scientific research institutions

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