AS3665 datasheet(35/78 Pages) AMSCO

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AS3665

Datasheet, Confidential - D e taile d D e scri pti on Audi o I np ut

Audio Input

Figure 20. Audio Input internal Circuit

The audio input can be used to connect an analog audio signal to the AS3665 and do lighting effects dependent on this

input signal on pad INT/AUDIO_IN

The audio processing path is shown in Figure 20: The audio signal is amplified by the input amplifier with an adjustable

gain setting to allow different audio input levels. With the ADC the signal is converted into a digital 10 bits signal. After

the AGC, the data is filtered and then can be used with the sequencer command Get ADC (see page 67). The

sequencers can then run different filter and processing algorithms to obtain the lighting effects.

result_not_ready

Indicates end of ADC conversion cycle

Result is ready

Conversion is running

Table 44. ADC_LSB_Result Register

Addr: 0Bh

ADC_LSB_Result Register

Bit

Bit Name

Default Access

Description

2:0

adc<2:0>

ADC Result bits 2:0 (LSBs)

8. Set int_mode=01 (analog input for ball INT/AUDIO_IN) and set adc_select=0 (to select audio buffer)

Table 45. Audio_Control Register

Addr: 1Ch

Audio_Control Register

Bit

Bit Name

Default Access

Description

audio_on

R/W

Enable AGC and Peak Detect for audio processing

Get ADC gets ADC value directly

Get ADC uses AGC and audio filter -recommended

setting if a audio signal is connected to the AS3665

Table 43. ADC_MSB_Result Register (Continued)

Addr: 0Ah

ADC_MSB_Result Register

Bit

Bit Name

Default Access

Description

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