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AS3668

Data Sheet - P i n A s s i g n m e n t s

4.1 Pin Description

Table 1. Pin Descriptions

Pin Name

Pin Number

Description

VBAT

Positive Power Supply Input for AS3668.

GND

Signal and Power Ground. Provide a short, direct PCB path between this pin and the nega-

tive side of the output capacitor of the charge pump capacitor CVCPOUT.

SCL

Serial Clock Input for the two wire I2C interface.

SDA

Serial-Data I/O for I2C interface. This pin is a open drain digital I/O which requires a pull up

resistor for data transfer.

GPIO/AUDIO_IN

General Purpose Input/Output or Audio Input. Depending on AS3668 configuration this

pin provided three different features. It can either be configured as general purpose input/

output

or as analogue audio input for music playback synchronization of AS3668 with an

audio source. Furthermore it is possible to use it as power up pin starting up with a default

PWM pattern sequence for LED1. If the pin is not used it is mandatory to connect it to

ground.

1. The output is an open-drain output only. Therefore an external Pull-Up resistors is required for output operation.

CURR1

CURR1 Output. This pin is a current source output which can be used to operate a LED. The

current source is internally connected to VCP. If the AS3668 is powered up with GPIO/

AUDIO_IN pin this current source is active with a default PWM pattern.

CURR2

CURR2 Output. This pin is a current source output which can be used to operate a LED. The

current source is internally connected to VCP.

CURR3

CURR3 Output. This pin is a current source output which can be used to operate a LED. The

current source is internally connected to VCP.

CURR4

CURR4 Output. This pin is a current source output which can be used to operate a LED. The

current source is internally connected to VCP.

VCP

Charge Pump Output. This pin requires an external blocking capacitor. The capacitor must

be placed as close as possible to VCP terminal.

Charge Pump Flying Capacitor. This is the positive terminal for the charge pump flying

capacitor. The capacitor should be placed as close as possible to AS3668. In addition it is

mandatory to keep the signal trace between the capacitor and CP terminal as short as

possible.

Charge Pump Flying Capacitor. This is the negative terminal for the charge pump flying

capacitor. The capacitor should be placed as close as possible to AS3668. In addition it is

mandatory to keep the signal trace between the capacitor and CN terminal as short as

possible.

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