ZSSC3036 datasheet(39/49 Pages) RENESAS

39 / 49 page

ZSSC3036 Datasheet

April 20, 2016

3.7.1.

Calibration Step 1 – Assigning Unique Identification

Assign a unique identification number to the ZSSC3036 by using the memory write command (40HEX + data and

41HEX + data; see Table 3.1 and Table 3.8) to write the identification number to Cust_ID0 at memory address

00HEX and Cust_ID1 at address 01HEX as described in section 3.6.1. These two 16-bit registers allow for more than

4 trillion unique devices.

3.7.2.

Calibration Step 2 – Data Collection

The number of unique points (measurand and/or temperature) at which calibration must be performed generally

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 with a minimum of three

different temperatures at three different bridge values. For a full calibration resulting in values for all 7 possible

bridge coefficients and 3 possible temperature coefficients, a minimum of 7 pairs of bridge with temperature

measurements must be collected.

Within this minimum 3x3 measurements field, data must be collected for the specific value pairs (at known

conditions) and then processed to calculate the coefficients. In order to obtain the potentially best and most robust

coefficients, it is recommended that measurement pairs (temperature vs. measurand) be collected at the outer

corners of the intended operation range or at least at points that are located far from each other. It is also

essential to provide highly precise reference values as nominal, expected values. The measurement precision of

the external calibration-measurement equipment should be ten times more accurate than the expected

ZSSC3036 output precision after calibration in order to avoid precision losses caused by the nominal reference

values (e.g., measurand signal and temperature deviations).

Note: An appropriate selection of measurement pairs can significantly improve the overall system performance.

The determination of the measurand-related coefficients will use all of the measurement pairs. For the

temperature-related correction coefficients, 3 (at three different temperatures) of the measurement pairs will be

used.

Note: There is an inherent redundancy in the 7 bridge-related and 3 temperature-related coefficients. Since the

temperature is a necessary output (which also needs correction), the temperature-related information is

mathematically separated, which supports faster and more efficient DSP calculations during the normal usage of

the sensor-IC system.

The recommended approach for data collection is to make use of the raw-measurement commands:

•

For bridge sensor values:

A2HEX + 0000HEX: single bridge measurement for which the configuration register will be loaded

from

the

BM_Config

(10HEX in MTP); preprogramming the

measurement setup in the MTP is required.

A3HEX + ssssHEX: single bridge measurement for which the BM_Config configuration register

(Gain, ADC, Offset, etc.) will be loaded as ssssHEX and must be provided

externally via the interface.

ZSSC3036 датащи(PDF) 39 Page - Renesas Technology Corp

ZSSC3036 датащи(HTML) 39 Page - Renesas Technology Corp

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49

датащи скачать

ссылки URL