AS39513 datasheet(35/108 Pages) AMSCO

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ams Datasheet

Page 35

[v1-10] 2018-Apr-25

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AS39513 − Detailed Description

ADC Scaling

The selected sensor input (temperature or battery or ext.

sensor) is passed through a buffer amplifier and then to the

ADC. The buffer amplifier has a selectable gain and offset. The

ADC then takes this buffered signal in combination with the

selected reference voltages and produces and output code

between 0 and 1023.

The first step in computing the ADC code is to determine the

source of the gndv1 setting and the mux_gain setting. They

depend on the type of measurement according to the table

below.

Figure 24:

ADC Scaling (defaults shown in brackets)

The parameters gndv1 and mux_gain determine the value of

the voltage and gain constants VLOW, VRNG, VMUXO, and AMUX

according to the table below.

Figure 25:

ADC Voltage and Gain Constants

Value

Measurement Type

Temperature

External

Battery

gndv1

TSV1G (1’b0)

EXV1G (1'b0)

mux_gain

2’b00

EXGAIN (2'b00)

2’b00

User Defined

VLOW

VRNG

VMUXO

AMUX

Comments

mux_gain

gndv1

Defaults for temp and ext. sensor input

Defaults for battery

2V1

-1

2V1

-1

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