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AS3722 Datasheet(PDF) 51 Page - ams-OSRAM AG |
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AS3722 Datasheet(HTML) 51 Page - ams-OSRAM AG |
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51 / 199 page  Page 50 ams Datasheet Document Feedback [v1-01] 2015-Sep-07 AS3722 − Detailed Descriptions- System Functions Normal Start-Up The following gives a brief description on a start-up from scratch (battery insertion). More details can be found in the start-up flow charts. • Powering up V2_5 (wait till it’s above VPOR) • The external capacitor on CREF is charged to 1.6V. • Check if VBAT is above ResVoltRise and VSUP above VSUP_min • Configuration of DCDC controller (number of phases) and SD2/SD3/SD4/SD5 (combined mode or separated) is automatically detected during start-up detection phase. • Current-sense calibration of SD0/SD1 and SD6 is performed • Startup State machine reads out the internal Boot-OTP. The start-up sequence of Step-Down Converter, LDO’s and GPIOs are controlled by the Boot-OTP. • Reset-Timer is set by the Boot-OTP • The reset is released when the Reset Timer expires (external pin XRES_OUT ) |
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