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[v1-03] 2015-Aug-10

AS3715 − Detailed Description – Power Management Functions

Current Sinks

Description

CURR1, 2 and 3 are high voltage (30V) current sinks, e.g. for

series of white LEDs or general purpose usage to drive buzzer,

vibrator, signal LEDs, etc.

Current sinks CURR1, 2 and 3 can be controlled individually. The

step-up DCDC converter (SU) may supply them with voltages

up to 30V. For an automatic feedback selection the used current

sinks can be assigned to the SU booster.

If not used as a current sink, CURR3 can be used to output

several status signals. In this mode the CURR3 output acts like

an open-drain output and needs an external pull-up resistor for

generating logic high levels.

Parameter

Figure 39:

Current Sink Parameter

Current Sink Parameter: Shows the key electrical parameter of the HV current sinks.

Symbol

Parameter

Conditions

Min

Typ

Max

Unit

ICURR1,2,3

CURR1,2 & 3 current

For V(CURRx) > 0.5V

resolution = 0.156mA

039.8

ICURR_protect

Current sink protection

Current

Protection current if stpup_on=1

and currx_current=00h

2μA

Absolute Accuracy

All Current sinks

-8

VCURR1,2,3

Voltage compliance

During normal operation

0.5

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