ZSC31015EAG1-R datasheet(32/53 Pages) RENESAS

32 / 53 page

November 14, 2016

ZSC31015 Datasheet

Step 1

– Assigning Unique Identification

Assigning a unique identification number is as simple as using the commands Program Cust_ID0, Program

Cust_ID1 and Program Cust_ID2. These three 8-bit registers allow for more than 16 million unique devices.

Gain_B must be programmed to 800HEX (unity) and Gain_T must be programmed to 80HEX (unity).

Step 2

– Data Collection

The number of unique (pressure, temperature) points that calibration must be performed at depends on the user

’s

needs. The minimum is a 2-point calibration, and the maximum is a 5-point calibration. To acquire raw data from

the part, set the ZSC31015 to enter Raw Mode. This is done by issuing a Start_CM (Start Command Mode

5090HEX) command/data pair to the ZSC31015 followed by a Start_RM (Start Raw Mode 4010HEX) command/data

pair with the LSB of the upper data nibble set. Now if the Gain_B term has been set to unity (800HEX) and the

Gain_T term has also been set to unity (80HEX), then the part will be in the Raw Mode and will output raw data on

its SIG

TM pin instead of corrected bridge and temperature. Capture several of these data points with the user’s

calibration system (16 each of bridge and temperature is recommended) and average them. Store these raw

bridge and temperature settings in the database along with the known pressure and temperature.

The output format during Raw Mode is Bridge_High, Bridge_Low, Temp. Each of these is an 8-bit quantity. The

upper 2-bits of Bridge_High are zero-filled. The Temp data (8-bits only) would not be enough information for

accurate temperature calibration. Therefore the upper three bits of temperature information are not given, but

rather assumed known. Therefore effectively 11-bits of temperature information are provided in this mode.

Step 3

– Coefficient Calculations

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

rough overview in section 3.6. IDT will provide software to perform the coefficient calculation. IDT can also

provide source code for the algorithms in a C code format. After the coefficients are calculated, the final step is to

write them to the EEPROM of the ZSC31015.

The number of calibration points required can be as few as two or as many as five. This depends on the precision

desired and the behavior of the resistive bridge in use.

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 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 Tco and a 2nd order correction

for the bridge measurement.

5-point calibration would 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, 2nd order

Tcg, or 2

nd order bridge.

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