AS7058 datasheet(26/199 Pages) AMSOSRAM

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AS7058

Functional description

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DS001077 • v2-00 • 2025-Sep-24

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7.2

Photodiode inputs

The AS7058 supports up to eight photodiode inputs which can be routed to both PPG

modulators for highest design flexibility. A simplified block diagram which shows the input

structures of the photodiode inputs is shown in Figure 23. Each photodiode input features a

dedicated multiplexer that allows each photodiode to be connected to PPG1 ADC, PPG2 ADC

or to PDREF pin which is the default connection to short circuit the photodiodes when not in

use. This is also the reset state after power-up and when no measurement is ongoing. The

input multiplexers are controlled automatically with the built in measurement sequencer and

get connected and disconnected while a measurement is ongoing, according to the device

configuration.

Figure 23: Photodiodes input selection

It is also possible to change the PDREF voltage level from typ. 0.8 V to 0 V via register

PDREF_SEL register.

PDREF

PD1

PD2

PD3

PD4

PD6

PD7

PD8

PD5

VSSA

VCM_PPG

Control

Logic

PD1_MUX

PD3_MUX

PD2_MUX

PD4_MUX

PD5_MUX

PD6_MUX

PD7_MUX

PD8_MUX

Connection to

PPG2 ADC

Connection to

PPG1 ADC

AS7058

PD REF_SEL

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