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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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LPS22CH датащи(PDF) 36 Page - STMicroelectronics |
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LPS22CH датащи(HTML) 36 Page - STMicroelectronics |
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36 / 55 page  Register description LPS22CH 36/55 DocID033100 Rev 2 Figure 22. “Threshold-based” interrupt event To enable the AUTOZERO mode, the AUTOZERO bit must be set to '1' and then the measured pressure value is used as the reference and stored in the register REF_P (REF_P_L (15h), REF_P_H (16h)). From this point on, the output pressure value (PRESS_OUT_XL (28h), PRESS_OUT_L (29h), PRESS_OUT_H (2Ah)) is updated with the difference between the measured pressure and REF_P. – P_DIFF_IN = measured pressure - REF_P – PRESS_OUT = measured pressure - REF_P After the first conversion, the AUTOZERO bit is automatically set back to '0'. In order to return back to normal mode, the RESET_AZ bit in the INTERRUPT_CFG (0Bh) register has to be set to '1'. This also resets the content of the REF_P registers to 0. AUTOREFP mode allows using the pressure differential for the generation of the interrupt keeping the output pressure registers PRESS_OUT (PRESS_OUT_XL (28h), PRESS_OUT_L (29h), PRESS_OUT_H (2Ah)) without comparing REF_P. If the AUTOREFP bit is set to '1', the measured output pressure is used as the reference in the register REF_P (REF_P_L (15h), REF_P_H (16h)) for interrupt generation with following: – P_DIFF_IN = measured pressure - REF_P The output registers PRESS_OUT (28h, 29h and 2Ah) are not changed by REF_P and shows as follows. – PRESS_OUT = measured pressure After the first conversion, the AUTOREFP bit is automatically set to '0'. In order to return back to normal mode, the RESET_ARP bit has to be set to '1' |
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