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AS7038RB

Functional Description

Datasheet

• PUBLIC

DS000726

• v2-00 • 2021-Jun-02

126

│ 97

Figure 129:

ADC Internal Circuit and Multiplexer

For best accuracy, the ADC can be optionally calibrated.

Information

If GPIO2 or GPIO3 is used as ADC input, there is no anti-aliasing filter in front of the ADC (needs to

be added externally).

7.1.19

ADC Threshold

At the output of the ADC converter a digital threshold can be enabled. If the output of the ADC

exceeds the threshold adc_threshold, it triggers an interrupt. This mechanism can be used to identify if

an object is in proximity of the sensor and then to interrupt the host. In cases where no object is

detected, the host can be sleeping therefore reducing power consumption of the system.

ADC

Vref=1.6V

AGND

V_LDO

Electrical

Frontend

TIA

GPIOs

vtemp

adc_channel_mask_temp

ADC_DATAH/L

FiFo

64x16 bit

entries

OFE

adc_channel_mask_tia

adc_channel_mask_ofe1/

sd1/ofe2/sd2

adc_channel_mask_afe

adc_channel_mask_ecgo

adc_channel_mask_ecgi

from ECG

Start from top and cycle through channels where

adc_channel_mask_...=1 (first channel selected seq_start 0->1)

ECG_

REF

Pre-

Filter

adc_channel_mask_pregain

adc_channel_mask_gpio3

adc_channel_mask_gpio2

GPIO3

GPIO2

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