ZSC31014EAC datasheet(45/58 Pages) IDT

45 / 58 page

ZSC31014 Datasheet

January 20, 2016

Step 1 – Assigning Unique Identification

Assigning a unique identification number is as simple as using the EEPROM WRITE command (see section 3.5)

to write the identification number to Cust_ID0 (EEPROM word 00HEX), Cust_ID1 (EEPROM word 0EHEX), and

Cust_ID2 (EEPROM word 13HEX); see section 3.6). These three 16-bit registers allow for more than 280 trillion

unique devices.

Important: Record the value of the Y coordinate for the die’s wafer location, which is stored as the default value

in bits [7:0] in register 0EHEX (see definition of ss on page 41), before overwriting with the user’s Customer ID

word 1 in case the value is needed for customer support.

Step 2 – Data Collection

The number of unique points (pressure and/ or temperature) at which calibration must be performed depends on

the requirements of the application and the behavior of the resistive bridge in use. The minimum number of points

required is equal to the number of bridge coefficients to be corrected. The available calibration methods and the

required number of points for each are listed below:

2-point calibration can be used if only a gain and offset term are needed for a bridge with no temperature

compensation for either term.

3-point calibration would be used to obtain 1

st order compensation for either a Tco or Tcg term but not

both.

3-point calibration could also be used to obtain 2

nd order correction for the bridge (SOT_bridge) but no

temperature compensation of the bridge output.

4-point calibration would be used to obtain 1

st order compensation for both Tco and Tcg.

4-point calibration could also be used to obtain 1

st order compensation for either Tco or Tcg (but not both)

and a 2

nd order correction for the bridge measurement.

5-point calibration could be used to obtain both 1

st order Tco correction and 1st order Tcg correction, plus

a 2

nd order correction that could be applied to one and only one of the following: 2nd order Tco (SOT_tco);

nd order Tcg (SOT_tcg); or 2nd order bridge.

There are many options for a 6-point calibration; however, the most likely would be for both 1

st and 2nd

order correction of Tco and Tcg.

7-point calibration would have all three 2

nd order terms applied: SOT_tco, SOT_tcg, and SOT_bridge.

Step 3 – Coefficient Calculations

The math to perform the coefficient calculation is complicated and will not be discussed in detail. There is a rough

overview in section 3.8. IDT provides software (DLLs) to perform the coefficient calculation. After the coefficients

are calculated, the final step is to write them to the EEPROM of the ZSC31014.

3.8. Calibration Math

IDT can provide software and hardware with samples to perform the calibration. For a complete description and

detailed examples, see ZSC31014_SSC_Evaluation_Kit_Description_Rev_X.xy.pdf. For more details on the

following equations, refer to ZSC31014 Technical Note—Detailed Equations for ZSC31014 Math (available on

request).

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