ABB QT715A-E GJR2348200R0002 Channel output module

When using the crystal oscillator, user must pay attention to the stable time of oscillator after enabling it, the stable time of oscillator will depend on frequency ` crystal type ` external capacitor and supply voltage. Before switching the system to the crystal oscillator, user must make sure the oscillator is stable;

System Clock and LVR level 

The clock source of system clock comes from EOSC, IHRC and ILRC, the hardware diagram of system clock in the PMC234/PMS234 is shown as Fig. 9.User can choose different operating system clock depends on its requirement; the selected operating system clock should be combined with supply voltage and LVR level to make system stable. The LVR level will be selected during compilation

Please notice that the crystal oscillator should be fully turned off before entering the power-down mode, in order to avoid unexpected wakeup event. If the 32KHz crystal oscillator is used and extremely low operating current is required, misc.6 can be set to reduce current after crystal oscillator is running normally.

System Clock Switching 

After IHRC calibration, user may want to switch system clock to a new frequency or may switch system clock at any time to optimize the system performance and power consumption. Basically, the system clock of PMC234/PMS234 can be switched among IHRC, ILRC and EOSC by setting the clkmd register at any time; system clock will be the new one after writing to clkmd register immediately. Please notice that the original clock module can NOT be turned off at the same time as writing command to clkmd register. The examples are shown as below and more information about clock switching, please refer to the “Help -> Application Note -> CLKMD”.

                                                                        

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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