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AS3677 数据表(PDF) 21 Page - ams AG |
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AS3677 数据表(HTML) 21 Page - ams AG |
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21 / 106 page  ams Datasheet Page 21 [v1-32] 2016-Sep-27 Document Feedback AS3677 − Detailed Description Charge Pump Mode Switching If automatic mode switching is enabled (cp_mode_ switching =00 or cp_mode_switching = 01) the charge pump monitors the current sinks, which are connected via an LED to the output CPOUT. To identify these current sources (sinks), the registers CP mode Switch1 and CP mode Switch2 (register bits rgb1_on_cp to rgb3_on_cp, curr1_on_cp, curr2_on_cp and curr6_on_cp) should be setup before starting the charge pump cp_on = 1. If any of the voltage on these current sources drops below the threshold (currlv_switch, currhv_switch), the next higher mode is selected after the debounce time. If the currX_on_cp=0 and the according current sink is connected to the charge pump, the current sink will be functional, but there is no up switching of the charge pump, if the voltage compliance is too low for the current sink to supply the specified current. Figure 27: Automatic Mode Switching ! "#$ " % "&'" % ! ( % ' ) ) *$ " % + % , ## -* . -/ 0- 0- $ $ 0-1 $ 1 2 AS3677 |
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