AS39513 datasheet(36/108 Pages) AMSCO

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[v1-10] 2018-Apr-25

AS39513 − Detailed Description

These constants in turn are used to calculate the effective ADC

offset and scale factor, VZERO and VSCALE, where

The ADC output code, nADC, will then be

where VSIG is the voltage of the selected multiplexer signal

(VSIG,TEMP, VSIG,EXT, VSIG,BAT1, or VSIG,BAT2).

Since the ADC voltage ranges for various settings can overlap,

it is often not obvious which are the optimum settings for a

given sensor voltage range. An Excel spreadsheet entitled

“AS39513 ADC Settings.xslx” has been developed which shows

the effect of the ADC references and sensor configuration

settings on the temperature and external sensor input ranges.

(EQ3)

VZERO

VLOW VMUXO

–

AMUX

-----------------------------------------

(EQ4)

VSCALE

VLOW VRNG

–

AMUX

-------------------------------------

(EQ5)

nADC

1024

VSIG VZERO

–

VSCALE

------------------------------------

(EQ6)

VSIG

nADC V

•

SCALE

() 1024

⁄

VZERO

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