AS3689 datasheet(23/72 Pages) AMSOSRAM

23 / 72 page

AS3689

austriami crosyst ems

Datasheet, Confidential

www.austriamicrosystems.com (mlg, ptr)

Revision 1.0.2 / 20070115

21 - 70

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

curr41_low_v

0 = voltage of current Sink CURR41 >currlv_switch

1 = voltage of current Sink CURR41 <currlv_switch

curr42_low_v

0 = voltage of current Sink CURR42 >currlv_switch

1 = voltage of current Sink CURR42 <currlv_switch

curr43_low_v

0 = voltage of current Sink CURR43 >currlv_switch

1 = voltage of current Sink CURR43 <currlv_switch

curr51_low_v

0 = voltage of current Sink CURR51 >currlv_switch

1 = voltage of current Sink CURR51 <currlv_switch

curr52_low_v

0 = voltage of current Sink CURR52 >currlv_switch

1 = voltage of current Sink CURR52 <currlv_switch

7.3.4 Usage of PCB Wire Inductance

The inductance between the battery and pins VBAT1 and VBAT2 can be used as a filter to reduce disturbance on

the battery. Instead of using one capacitor (C5) it is recommended to split C5 into C51 and C52 with the

capacitance equal:

C51 = C52 = 1/2 x C5

C51 or C52 should not be less than 1uF (nominal value). It is recommended to apply a minimum of 20nH

(maximum 200nH) with low impedance. This inductance can be realized on the PCB without any discrete coil.

Assuming that a 1mm signal line corresponds to approximately 1nH (valid if the length (L) is significantly bigger

than the width (W) of the line (L/W <10)), a line length of:

20mm < L < 200mm

is recommended. The shape of the line is not important.

Figure 14 – PCB Wire Inductance Example 1

C51

C52

Battery

Connector

VBAT1

AS3689 Datasheet(PDF) 23 Page - ams-OSRAM AG

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