AS89020 datasheet(12/32 Pages) AMSOSRAM

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db09284e_V3.01_preliminary_2017-07-06

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AS89020

V3.01

4 PIN ASSIGNMENT

The pin assignment is shown in the following table.

Table 4: Pin assignment (Analog/Digital)

TYPE

A/D

DESCRIPTION

VDDA

power

analog power supply voltage

VSSA

power

analog ground voltage

VDD

power

digital power supply voltage (VDDA = VDD)

VSS

power

digital ground voltage (VSSA = VSS)

IN0, IN1, IN2, IN3

input

current inputs

REXT

input

constant reference current (6 µA) for setting the

full-scale ratio (FSR) of AD conversion

(200 kΩ resistor REXT to VSSA has to be connected)

VRT

output

TIA reference voltage – recommended as external

photodiodes bias voltage (cathodes or anodes)

VRH

output

ADC high reference voltage

VRL

output

ADC low reference voltage

VBH

output

internal reference voltage

SCLK

input

SPI and ADC clock input (pull-up)

SDI

input

SPI data input (pull-up)

SDO

output

SPI data output

CSN

input

SPI chip select (pull-up and low-active)

CONVN

input

start AD conversion (pull-up and low-active)

PDN

input

Power Down mode (pull-up and low-active)

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