ZSC31010CEC datasheet(13/43 Pages) IDT

13 / 43 page

ZSC31010 Datasheet

January 20, 2016

)

Tco

Offset

Raw

(

)

Tcg

(

Gain

∗

∆

∗

∆

)

SOT

(

∗

2.3.

Digital Signal Processor

A digital signal processor (DSP) is used for processing the converted bridge data as well as for performing

temperature correction and for computing the temperature value for output on the digital channel.

The DSP reads correction coefficients from the EEPROM and can correct for

• Bridge Offset

• Bridge Gain

• Variation of Bridge Offset over Temperature (Tco)

• Variation of Bridge Gain over Temperature (Tcg)

• A Single Second Order Effect (SOT - Second Order Term)

The EEPROM contains a single SOT that can be applied to correct one and only one of the following:

• 2

nd order behavior of bridge measurement

• 2

nd order behavior of Tco

• 2

nd order behavior of Tcg

(For more details, see section 3.6.1.)

If the SOT applies to correcting the bridge reading, then the correction formula for the bridge reading is

represented as a two step process as follows:

(1)

(2)

Where:

= Corrected Bridge reading that is fed as digital or analog output on Sig™ pin

= Intermediate result in the calculations

BR_Raw

= Raw Bridge reading from ADC

T_Raw

= Raw Temperature reading converted from PTAT signal

Gain_B

= Bridge gain term

Offset_B

= Bridge offset term

Tcg

= Temperature coefficient gain

Tco

= Temperature coefficient offset

∆T

= (T_Raw - TSETL)

T_Raw

= Raw Temperature reading converted from PTAT signal

TSETL

= Raw PTAT reference value (See Technical Note—ZSC31010, ZSC31015, and ZSSC3015

Calibration Sequence, DLL, and EXE for details.)

SOT

= Second Order Term

Note:

See section 3.6.2.7 for limitations when SOT applies to the bridge reading.

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