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AS3668-BQFT Datasheet(PDF) 5 Page - ams AG |
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AS3668-BQFT Datasheet(HTML) 5 Page - ams AG |
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5 / 60 page  www.austriamicrosystems.com/AS3668 Revision 1.11 5 - 60 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 C2 Positive Power Supply Input for AS3668. GND D2 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 B3 Serial Clock Input for the two wire I2C interface. SDA C3 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 D3 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 1 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 B2 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 C1 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 A1 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 D1 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 B1 Charge Pump Output. This pin requires an external blocking capacitor. The capacitor must be placed as close as possible to VCP terminal. CP A2 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. CN A3 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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