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AS3687 数据表(PDF) 19 Page - ams AG |
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AS3687 数据表(HTML) 19 Page - ams AG |
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19 / 55 page  AS3687/87XM Datasheet www.austriamicrosystems.com/AS3687 1v3-4 18 - 54 CP Mode Switch 2 Addr: 25h Setup which current sinks are connected (via leds) to the charge pump; if set to ‘1’ the correspond current source (sink) is used for automatic mode selection of the charge pump Bit Bit Name Default Access Description 0 curr1_on_cp 0 R/W 0 = current Sink CURR1 is not connected to charge pump 1 = current sink CURR1 is connected to charge pump 1 curr2_on_cp 0 R/W 0 = current Sink CURR2 is not connected to charge pump 1 = current sink CURR2 is connected to charge pump 7 curr6_on_cp 0 R/W 0 = current Sink CURR6 is not connected to charge pump 1 = current sink CURR6 is connected to charge pump Curr low voltage status 1 Addr: 2Ah Indicates the low voltage status of the current sinks. If the currX_low_v bit is set, the voltage on the current sink is too low, to drive the selected output current Bit Bit Name Default Access Description 0 curr30_low_v 1 R 0 = voltage of current Sink CURR30 >curr3x_switch 1 = voltage of current Sink CURR30 <curr3x_switch 1 curr31_low_v 1 R 0 = voltage of current Sink CURR31 >curr3x_switch 1 = voltage of current Sink CURR31 <curr3x_switch 2 curr32_low_v 1 R 0 = voltage of current Sink CURR32 >curr3x_switch 1 = voltage of current Sink CURR32 <curr3x_switch 3 curr33_low_v 1 R 0 = voltage of current Sink CURR33 >curr3x_switch 1 = voltage of current Sink CURR33 <curr3x_switch 7 curr6_low_v 0 R 0 = voltage of current Sink CURR6 >currlv_switch 1 = voltage of current Sink CURR6 <currlv_switch Curr low voltage status 2 Addr: 2Bh Indicates the low voltage status of the current sinks. If the currX_low_v bit is set, the voltage on the current sink is too low, to drive the selected output current Bit Bit Name Default Access Description 0 curr1_low_v 0 R 0 = voltage of current Sink CURR1 >currhv_switch 1 = voltage of current Sink CURR1 <currhv_switch 1 curr2_low_v 0 R 0 = voltage of current Sink CURR2 >currhv_switch 1 = voltage of current Sink CURR2 <currhv_switch 7.3 Current Sinks The AS3687/87XM contains general purpose current sinks intended to control backlights, buzzers, and vibrators. All current sinks have an integrated protection against overvoltage. CURR1, CURR2 and CURR6 is also used as feedback for the Step Up DC/DC Converter (regulated to 0.5V in this configuration). Current sinks CURR1, CURR2 and CURR6 are high-voltage compliant (15V) current sinks, used e.g., for series of white LEDs Current sinks CURR3x (CURR30, CURR31, CURR32 and CURR33) are parallel 5V current sinks, used for backlighting or indicator LEDs. |
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