TLE7809G datasheet(17/52 Pages) INFINEON

17 / 52 page

Data Sheet

Rev. 3.01, 2008-04-15

TLE7809G

ADC Measurement Interface

Further details on the implementation of the calibration function and location of the calibration figures in Flash

memory can be found in a dedicated application note. The voltage measurement target parameters can be found

in “ADC Battery Voltage Measurement Interface, VBAT_SENSE” on Page 43.

6.2

Temperature Measurement

In the temperature measurement mode the typical internal analog output voltage of the on-chip temperature

sensor can be described with the first order approximation:

(4)

Where:

•

j is the junction temperature in Kelvin

•moand m1 are typical linear fitting parameters

(see Table “ADC Temperature Measurement Interface” on Page 43)

The output code of the ADC is given by the following equation, where

AREF and N denote the ADC reference

voltage and the resolution of the ADC:

(5)

The junction temperature

J corresponding to the output code CA is given by:

[unit: K]

(6)

273.15 °C need to be subtracted to convert

j [K] into Centigrade Scale [°C].

The temperature measurement target parameters can be found in“ADC Temperature Measurement Interface”

on Page 43.

6.2.1

Temperature Measurement Calibration Concept

Best measurement accuracy can be obtained by applying the calibration function:

(7)

The calibration coefficients f0 / 1 are computed during the production test and stored in the flash memory of the

microcontroller.

The selection between battery voltage and temperature measurement is done via SPI bit (see “SPI (Serial

Peripheral Interface)” on Page 19).

Further details on the implementation of the calibration function and location of the calibration figures can be found

in a dedicated application note.

VA m0 m1 Tj

–

≈

round

VA Tj

()

–

()

VAREF

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

VA VAREF

≤

------- m0

CA Tj

() VAREF

–

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

–

TCAL 586 f0 2

–

•

2 2

–

f1 2

–

•

[]

–

CA Tj

()

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