ZSC31015EEG1-R datasheet(31/53 Pages) RENESAS

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November 14, 2016

ZSC31015 Datasheet

Command

Byte

Data

Description

80HEX

YYHEX

Program Gain_B upper 7-bits (Set the MSB to 0.)

90HEX

YYHEX

Program Gain_B lower 8-bits

A0HEX

YYHEX

Program Offset_B upper 6-bits (Set the two MSBs to 0.)

B0HEX

YYHEX

Program Offset_B lower 8-bits

C0HEX

YYHEX

Program Gain_T

D0HEX

YYHEX

Program Offset_T

E0HEX

YYHEX

Program Tco

F0HEX

YYHEX

Program Tcg

08HEX

YYHEX

Program Upper Clipping Limit (Set the MSB to 0.)

18HEX

YYHEX

Program Lower Clipping Limit (Set the MSB to 0.)

28HEX

YYHEX

Program Cust_ID0

38HEX

YYHEX

Program Cust_ID1

48HEX

YYHEX

Program Cust_ID2

3.4.

Calibration Sequence

Although the ZSC31015 can work with many different types of resistive bridges, assume a pressure bridge is

being used for the following discussion on calibration.

Calibration essentially involves collecting raw bridge and temperature data from the ZSC31015 for different known

pressures and temperatures. This raw data can then be processed by the calibration master (typically a PC) to

compute the coefficients, and the calculated coefficients can then be written to the ZSC31015.

IDT can provide software and hardware with samples to perform the calibration.

There are three main steps to calibration:

Assigning a unique identification to the ZSC31015. This identification is programmed in EEPROM and

can be used as an index into the database stored on the calibration PC. This database will contain all the

raw values of bridge readings and temperature readings for that part, as well as the known pressure (for

this application) and temperature the bridge was exposed to. This unique identification can be stored in a

concatenation of the following EEPROM registers: Cust_ID0, Cust_ID1, Cust_ID2. These registers can

also form a permanent serial number.

Data collection. Data collection involves getting raw data from the bridge at different known pressures and

temperatures. This data is then stored on the calibration PC using the unique identification of the

ZSC31015 as the index to the database.

Coefficient calculation and write. Once enough data points have been collected to calculate all the

desired coefficients then the coefficients can be calculated by the calibrating PC and written to the

ZSC31015.

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