AS3687 datasheet(38/55 Pages) AMSCO

38 / 55 page

AS3687/87XM

Datasheet

www.austriamicrosystems.com/AS3687

1v3-4

37 - 54

Addr: 26h

ADC_control

This register input source selection and initialization of ADC.

Bit

Bit Name

Default

Access

Description

5:0

adc_select

R/W

Selects input source as ADC input.

000000 (00h) = reserved

000001 (01h) = reserved

000010 (02h) = reserved

000011 (03h) = reserved

000100 (04h) = reserved

000101 (05h) = reserved

000110 (06h) = reserved

000111 (07h) = reserved

001000 (08h) = CURR1

001001 (09h) = CURR2

001010 (0Ah) = CURR30

001011 (0Bh) = CURR31

001100 (0Ch) = CURR32

001101 (0Dh) = CURR33

001110 (0Eh) = reserved

001111 (0Fh) = reserved

010000 (10h) = reserved

010001 (11h) = reserved

010010 (12h) = reserved

010011 (13h) = CURR6

010100 (14h) = VBAT

010101 (15h) = CP_OUT

010110 (16h) = DCDC_FB

010111 (17h) = ADCTEMP_CODE (junction temperature)

011xxx, 1xxxxx = reserved

reserved – don’t use; always write 0 to this register

start_conversion

N/A

Writing a 1 into this bit starts one ADC conversion cycle.

Notes:

See Table ‘ADC Input Ranges, Compliances and Resolution’ for ADC ranges and possible

Figure

27 – ADC Circuit

10bit SAR

ADC

V2_5

D9:D0

result_not_ready

CURR6

DCDC_FB

vtemp

CURR2

CURR1

180k

120k

CURR32

CURR33

VBAT

CURR31

CURR30

VCP

adc_select

Control

start_conversion

1MHz

7.6

Audio controlled RGB LEDs (only AS3687XM)

Up to 2 RGB LEDs (connected to the pins CURR30-CURR32 and/or CURR1,2,6) can be controlled by an audio

source (connected to pin CURR33/AUDIO_IN).

The color of the RGB LED(s) is depending on the input

amplitude and it starts from black transitions to blue, green, cyan, yellow, red and for high amplitudes white is

used (internal lookup table if audio_color=000b).

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