AS3687 datasheet(19/55 Pages) AMSCO

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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

curr1_on_cp

R/W

0 = current Sink CURR1 is not connected to charge pump

1 = current sink CURR1 is connected to charge pump

curr2_on_cp

R/W

0 = current Sink CURR2 is not connected to charge pump

1 = current sink CURR2 is connected to charge pump

curr6_on_cp

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

curr30_low_v

0 = voltage of current Sink CURR30 >curr3x_switch

1 = voltage of current Sink CURR30 <curr3x_switch

curr31_low_v

0 = voltage of current Sink CURR31 >curr3x_switch

1 = voltage of current Sink CURR31 <curr3x_switch

curr32_low_v

0 = voltage of current Sink CURR32 >curr3x_switch

1 = voltage of current Sink CURR32 <curr3x_switch

curr33_low_v

0 = voltage of current Sink CURR33 >curr3x_switch

1 = voltage of current Sink CURR33 <curr3x_switch

curr6_low_v

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

curr1_low_v

0 = voltage of current Sink CURR1 >currhv_switch

1 = voltage of current Sink CURR1 <currhv_switch

curr2_low_v

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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