Data Sheet

Application Note
Rev. 1.00 / July 2015
ZSC31050, ZSC31150, ZSSC313x,
ZSSC3154, and ZSSC3170
RBIC1 Calibration DLL
Multi-Market Sensing Platforms
Precise and Deliberate
RBIC1 Calibration DLL
ZSC31050 / ZSC31150 / ZSSC313x / ZSSC3154 / ZSSC3170
Contents
1
2
RBIC1 Dynamic-Link Library (DLL) .................................................................................................................. 3
Calibration Sequence ....................................................................................................................................... 4
2.1. Set-up and Initialization ............................................................................................................................. 5
2.2. Data Collection .......................................................................................................................................... 6
2.3. Coefficient Calculation ............................................................................................................................... 7
2.3.1. Function Call for Main Sensor Channel .............................................................................................. 7
2.3.2. Function Call for Temperature Channel .............................................................................................. 8
2.3.3. Returned Error Codes ....................................................................................................................... 10
2.3.4. Calculation Examples ....................................................................................................................... 11
2.4. EEPROM Programming .......................................................................................................................... 11
2.5. Verification ............................................................................................................................................... 12
3 Glossary ......................................................................................................................................................... 13
4 Document Revision History ............................................................................................................................ 13
List of Figures
Figure 1.1
Figure 2.1
Figure 2.2
Figure 2.3
Figure 2.4
Figure 2.5
SSC Block Diagram and Signal Flow for a Pressure Sensor Example .............................................. 4
Basic Analog Front-End ...................................................................................................................... 5
Calibration Points ................................................................................................................................ 6
Calibration Points and Target Values for Sensor Measurements ...................................................... 7
Calibration Points and Target Values for Temperature Measurement ............................................... 9
Calculation and Measurement Results ............................................................................................. 12
List of Tables
Table 1.1
Table 2.1
Table 2.2
Table 2.3
Coefficients that Result from ZMD31050_cal1 ................................................................................... 3
List of Calibration Parameters ............................................................................................................ 7
List of Temperature Calculation Function Parameters ....................................................................... 8
Returned Error Codes ....................................................................................................................... 10
For more information, contact ZMDI via [email protected]
Application Note
July 9, 2015
© 2015 Zentrum Mikroelektronik Dresden AG — Rev. 1.00
All rights reserved. The material contained herein may not be reproduced, adapted, merged, translated, stored, or used without the
prior written consent of the copyright owner. The information furnished in this publication is subject to changes without notice.
2 of 13
RBIC1 Calibration DLL
ZSC31050 / ZSC31150 / ZSSC313x / ZSSC3154 / ZSSC3170
1
RBIC1 Dynamic-Link Library (DLL)
The calibration DLL described in this document is designed to expedite the calibration process for the ZSC31050,
ZSC31150, ZSSC313x, ZSSC3154, and ZSSC3170 Sensor Signal Conditioner (SSC) products. Unless otherwise
noted, the term SSC IC will be used in this document to refer to these five products.
The calibration process compensates the sensor input offset, sensor linearization, and sensor’s sensitivity
temperature dependency. It uses a polynomial function called ZMD31050_cal1, which calculates coefficients for
rd
nd
up to 3 order linearization compensation and up to 2 order for the temperature compensation. The RBIC1 DLL
is contained in the Evaluation Software installation folder.
Coefficients resulting from ZMD31050_cal1 are stored in the SSC EEPROM memory. Table 1.1 provides a list of
the resulting coefficients.
Table 1.1
Coefficients that Result from ZMD31050_cal1
Coefficient
Name
EEPROM
Address
C0
00HEX
Offset
Input signal when no sensor excitation is present
C1
01HEX
Gain
Sensor signal gain value
C2
02HEX
Linearization
2 order non-linearity for three-point calibration
C3
03HEX
Linearization
3 order non-linearity for four-points calibration
C4
04HEX
Temperature compensation
1 order temperature coefficient sensor offset
C5
05HEX
Temperature compensation
2 order temperature coefficient sensor offset
C6
06HEX
Temperature compensation
1 order temperature coefficient gain dependency
C7
07HEX
Temperature compensation
2 order temperature coefficient gain dependency
Application Note
July 9, 2015
Polynomial Function
Description
nd
nd
st
st
st
st
© 2015 Zentrum Mikroelektronik Dresden AG — Rev. 1.00
All rights reserved. The material contained herein may not be reproduced, adapted, merged, translated, stored, or used without the
prior written consent of the copyright owner. The information furnished in this publication is subject to changes without notice.
3 of 13
RBIC1 Calibration DLL
ZSC31050 / ZSC31150 / ZSSC313x / ZSSC3154 / ZSSC3170
Figure 1.1 illustrates a typical signal flow from measuring the physical value to the output of the conditioned result
with offset compensation and gain compensation to meet the voltage output targets and signal linearization
requirements for the application.
Figure 1.1 SSC Block Diagram and Signal Flow for a Pressure Sensor Example
Physical Value
Sensor
Measurement
Calculation
Output
Sensor Signal Conditioner
p
diode
t0
AFE
CMC
Main
Channel(s)
Linearization
&
Compensation
Output
D/A
Supplementary
Channel
Linearization
Serial Interface
Analog
Digital
Pressure Sensor
Output
V
mV
T1
T2
T3
p
2
p
Calibration Sequence
A typical calibration flow contains five steps in the following order:
1. Set-up and initialization
2. Data collection
3. Coefficient calculation
4. EEPROM programming
5. Verification
These five steps are very similar for all applicable products; there might be some insignificant differences in the
Evaluation Software user interface.
2
Connect the SSC IC to the user’s PC using the selected interface applicable to the product: I C™*, OWI, LIN, or
SPI. Refer to the product’s Functional Description document for the available command set.
* I2C™ is a trademark of NXP.
Application Note
July 9, 2015
© 2015 Zentrum Mikroelektronik Dresden AG — Rev. 1.00
All rights reserved. The material contained herein may not be reproduced, adapted, merged, translated, stored, or used without the
prior written consent of the copyright owner. The information furnished in this publication is subject to changes without notice.
4 of 13
RBIC1 Calibration DLL
ZSC31050 / ZSC31150 / ZSSC313x / ZSSC3154 / ZSSC3170
2.1.
Set-up and Initialization
Prior to data collection, the SSC must to be configured so that the analog front-end (AFE), temperature
measurement, and additional SSC functions fit the sensor’s parameters and application requirements. This
includes gain selection, sensor signal range, ADC resolution, temperature sensor in use, output format, and
diagnostic functions.
The goal is to adjust the gain so the sensor signal is as close as possible to the acceptable ADC voltage range for
the full operational temperature range. For this, the sensor span, offset, and tolerances must be taken into
account.
Next, write the initial configuration into the RAM or the EEPROM of the SSC IC.
Note: Setting initial coefficients values is not required (initially coefficients can be set to 0 or any value).
Figure 2.1 Basic Analog Front-End
Sensor Signal Conditioner
AFE
VADC_REF
D
Analog Block
Digital Block
A
P
diode
VIN
N
Resolution
(res)
∑
a1
CMC
a2
±V
VADC
A D
Output
ADCOUT
∑
Amplifier with Gain a1
Amplifier with Gain a2
[mV]
ADC
Saturation
[V]
VSS = 0
ADC Output with range shift
+/- ½ [counts]
Max 2res
VADC_REF
Saturation
Max 90% VADC_REF
ADC
input
VADC
+½ x 2res
a2.VXZC
½ VADC_REF
VIN
Sensor Output
-½ x 2res
Min 10% VADC_REF
0
Min
Application Note
July 9, 2015
- 2res
0
Physical Value
Max
Min
Measurant (Analog)
Max
Measurant (Digital)
© 2015 Zentrum Mikroelektronik Dresden AG — Rev. 1.00
All rights reserved. The material contained herein may not be reproduced, adapted, merged, translated, stored, or used without the
prior written consent of the copyright owner. The information furnished in this publication is subject to changes without notice.
5 of 13
RBIC1 Calibration DLL
ZSC31050 / ZSC31150 / ZSSC313x / ZSSC3154 / ZSSC3170
2.2.
Data Collection
After the coefficients in EEPROM are initialized, data collection can begin. The minimum number of calibration
points required varies between two and as many as eight for the main sensor and two or three for the temperature
sensor. This depends on the precision required and the behavior of the sensor in use. In general, taking more
calibration points will result in a better calibration.
Figure 2.2 shows the expected placement of calibration points for the different calibration options. The order of
the points taken is not important; however, the number of points per temperature must be followed or the
calibration might fail. The location and order of the temperature values is also not important – however for best
results, the temperatures should be spread evenly throughout the user’s specification range. It is important to
keep the calibration points as orthogonal as possible to maximize calibration accuracy.
Figure 2.2 Calibration Points
-40o
°C
Min.
Linear sensor signal with
linear temperature
compensation
Min.
-40o
°C
2
nd
o
25o 125
Min.
-40o
°C
Max.
Input signal
Input signal
Max.
o
25o 125
o
25o 125
2nd order sensor signal
(non-linearity compensation)
Linear sensor signal
(2-points measurement)
-40o
Min.
o
25o 125 °C
3rd order sensor signal
(non-linearity compensation)
Max.
Input signal
o
25o 125
Max.
Input signal
Min.
-40o
Max.
Input signal
Input signal
Max.
°C
order sensor signal with
linear temperature
compensation
Min.
-40o
o
25o 125
°C
rd
3 order sensor signal with
2nd order temperature
compensation
rd
The calibration point configuration can be any setup from 2-points linear calibration to 3 order non-linearity comnd
pensation and 2 order temperature dependency compensation.
Application Note
July 9, 2015
© 2015 Zentrum Mikroelektronik Dresden AG — Rev. 1.00
All rights reserved. The material contained herein may not be reproduced, adapted, merged, translated, stored, or used without the
prior written consent of the copyright owner. The information furnished in this publication is subject to changes without notice.
6 of 13
RBIC1 Calibration DLL
ZSC31050 / ZSC31150 / ZSSC313x / ZSSC3154 / ZSSC3170
2.3.
Coefficient Calculation
2.3.1.
Function Call for Main Sensor Channel
ZMD31050_cal1 (Zp1m, Zp2m, Zp4m, Zp3m, Zp1u, Zp2u, Zp1l, Zp2l, A, B, M2, M, Ztmed, Ztupp, Ztlow, adc_res,
&C0, &C1, &C2, &C3, &C4, &C6, &C5, &C7);
Figure 2.3 Calibration Points and Target Values for Sensor Measurements
3rd Order Sensor Signal with 2nd Order
Temperature Compensation
Output Target
%[VDDA]
Zp2l
B
Zp2m
Zp2u
Max.90%
Zp4m
M2
Zp3m
M
Zp1l
A
Zp1m
Zp1u
Min.10%
l
-40
o
Min.
-5
u
m
o
25
Ztlow
o
Ztmed
85o
125o
Ztupp
Max.
o
C
Acquired Data (ADC counts)
Table 2.1
List of Calibration Parameters
Name
ZMD31050_cal1
Zp1m
Zp2m
Description
Function call, main sensor channel
Sensor minimum output
Sensor maximum output
Type
Range
int
4 bytes
float
float
If not
used
Returns 0 if successful
±2
15
Required
±2
15
Required
0
Medium temperature
Zp3m
Sensor output (2nd order nonlinearity)
float
±2
15
Zp4m
Sensor output (3rd order nonlinearity)
float
±2
15
0
Zp1u
Sensor minimum output
float
±2
15
0
0
Upper temperature
Zp2u
Sensor maximum output
float
±2
15
Zp1l
Sensor minimum output
float
±2
15
0
±2
15
0
Zp2l
Sensor maximum output
A
M
M2
B
Application Note
July 9, 2015
Target output value in [%] multiplied by
0.01 for digital output target
0.006875 for analog output target
float
Condition
Lower temperature
float
0 to 1
Required
float
0 to 1
0
float
0 to 1
0
float
0 to 1
Required
A < M < M2 < B
© 2015 Zentrum Mikroelektronik Dresden AG — Rev. 1.00
All rights reserved. The material contained herein may not be reproduced, adapted, merged, translated, stored, or used without the
prior written consent of the copyright owner. The information furnished in this publication is subject to changes without notice.
7 of 13
RBIC1 Calibration DLL
ZSC31050 / ZSC31150 / ZSSC313x / ZSSC3154 / ZSSC3170
Name
Description
Ztmed
Type
Temperature sensor
Ztupp
float
Temperature sensor
Ztlow
Temperature sensor
adc_res
ADC resolution
C0 to C7
Calculated coefficients
float
float
Range
If not
used
Condition
±2
15
-33000.0
Medium temperature
±2
15
-33000.0
Upper temperature
±2
15
-33000.0
Lower temperature
int
9 to 16
-
Given in bits
float
4 bytes
0
Results upon success
Data acquisition commands: D8HEX for sensor and D9HEX for calibration temperature.
Command format: [7bit Slave Address] [0]
[8-bit command]
Evaluation software command:
2
I C™ interface: IW_78001D8
OWI interface:
OW_78001D8
LIN interface:
LW_3c0087F05B4D8FFFFFFFF
2.3.2.
Function Call for Temperature Channel
TQuad (Ztlow, Ztupp, Ztmed, Tlow, Tupp, Tmed, adc_res, &Ct0, &Ct1, &Ct2);
TLin
Table 2.2
(Ztmed, Ztupp, Tmed, Tupp, &Ct0, &Ct1);
List of Temperature Calculation Function Parameters
Name
Description
Type
nd
TQuad
Function call, temperature channel 2
TLin
Function call, temperature channel linear
Ztmed
bool
float
Temperature sensor
Ztlow**
Temperature sensor
Tlow
Target value calculated by:
 ∗
 − ⁡[%]
 − ⁡[℃]
float
float
+
[%]
100
Tupp
Where VDDA stands for analog power supply and ADC
reference voltage of the IC.
adc_res
ADC resolution, temperature channel
Ct1 to Ct3
Calculated coefficients, temperature channel
Application Note
July 9, 2015
Condition
Returns 0 if successful
bool
Temperature sensor
Ztupp
Tmed
order
Range
Returns 0 if successful
±2
15
Medium temperature
±2
15
Upper temperature
±2
15
Lower temperature
float
0 to 1
 =  − 
float
0 to 1
 =  − 
float
0 to 1
 =  − 
int
9 to 16
Given in bits
float
4 bytes
Result upon success
© 2015 Zentrum Mikroelektronik Dresden AG — Rev. 1.00
All rights reserved. The material contained herein may not be reproduced, adapted, merged, translated, stored, or used without the
prior written consent of the copyright owner. The information furnished in this publication is subject to changes without notice.
8 of 13
RBIC1 Calibration DLL
ZSC31050 / ZSC31150 / ZSSC313x / ZSSC3154 / ZSSC3170
Data acquisition commands: DAHEX
Command format: [7bit Slave Address] [0] [8-bit command]
Evaluation Software Command:
2
I C™ interface: IW_78001DA
OWI interface:
OW_78001DA
LIN interface:
LW_3c0087F05B4DAFFFFFFFF
Figure 2.4 Calibration Points and Target Values for Temperature Measurement
2nd Order Temperature Compensation
%VDDA
Output Target
Max.
90%[VDDA]
o
C
125o
Tlow
Ztupp
85o
Tlow
Ztmed
25o
Tlow
Ztlow
-5o
Min.
10%[VDDA]
-40o
Acquired Data (ADC counts)
The upper and lower limits (Max. and Min.) are usually selected as 10% and 90% of the ADC reference voltage
(the analog voltage supply). Note that this varies depending on the SSC IC. In this input range, the ADC has the
best performance for linearity.
Application Note
July 9, 2015
© 2015 Zentrum Mikroelektronik Dresden AG — Rev. 1.00
All rights reserved. The material contained herein may not be reproduced, adapted, merged, translated, stored, or used without the
prior written consent of the copyright owner. The information furnished in this publication is subject to changes without notice.
9 of 13
RBIC1 Calibration DLL
ZSC31050 / ZSC31150 / ZSSC313x / ZSSC3154 / ZSSC3170
2.3.3.
Returned Error Codes
Note: bit [0] is not used
Table 2.3
Returned Error Codes
Flags
HEX
Bit
Description
0000 0000 0000 0010
0002HEX
bit[1]
No solution found for given input data.
0000 0001 0000 0010
0102HEX
bit[1] and bit[8]
Calculated coefficients are out of range (linear calibration).
0000 0010 0000 0010
0202HEX
bit[1] and bit[9]
Offset: No solution found or coefficients are out of range.
0000 0100 0000 0010
0402HEX
bit[1] and bit[10]
Gain: No solution found or coefficients are out of range.
0000 1000 0000 0010
0802HEX
bit[1] and bit[11]
2
nd
order: No solution found or coefficients are out of range.
rd
0001 0000 0000 0010
1002HEX
bit[1] and bit[12]
3 order: No solution found or coefficients are out of range.
0000 0000 0000 0100
0004HEX
bit[2]
Range check error.
0000 0001 0000 0100
0104HEX
bit[2] and bit[8]
Offset compensation error.
0000 0010 0000 0100
0204HEX
bit[2] and bit[9]
Gain calculation error.
0000 0100 0000 0100
0404HEX
bit[2] and bit[10]
C1 and C2 calculation error.
0000 0100 0000 0100
0804HEX
bit[2] and bit[11]
C3 and C4 calculation error.
0000 1000 0000 0100
1004HEX
bit[2] and bit[12]
C5 calculation error.
0010 0000 0000 0100
2004HEX
bit[2] and bit[13]
C6 calculation error.
0100 0000 0000 0100
4004HEX
bit[2] and bit[14]
C7 calculation error.
0000 0000 0000 1000
0008HEX
bit[3]
Temperature behavior linearization calculation error.
0000 0001 0000 1000
0108HEX
bit[3] and bit[8]
Offset temperature coefficient calculation (C4 and C5).
0000 0010 0000 1000
0108HEX
bit[3] and bit[9]
Gain temperature coefficient calculation (C6 and C7).
0000 0000 0001 0000
0010HEX
bit[4]
Coefficients range check error.
0000 0001 0001 0000
0110HEX
bit[4] and bit[8]
Coefficient range check (C0 and C1) error.
0000 0010 0001 0000
0210HEX
bit[4] and bit[9]
Non-linearity coefficient range check (C2 and C3).
Application Note
July 9, 2015
© 2015 Zentrum Mikroelektronik Dresden AG — Rev. 1.00
All rights reserved. The material contained herein may not be reproduced, adapted, merged, translated, stored, or used without the
prior written consent of the copyright owner. The information furnished in this publication is subject to changes without notice.
10 of 13
RBIC1 Calibration DLL
ZSC31050 / ZSC31150 / ZSSC313x / ZSSC3154 / ZSSC3170
2.3.4.
Calculation Examples
ADC max.:
ADC min.:
ADC resolution:
Data points:
Temperature points:
90%[VDDA]
10%[VDDA]
14 bit
10%, 50%, 70% and 90%
-40°C, -5°C, 25°C, 85°C and 125°C
Linear (two points, no non-linearity and temperature compensation)
ZMD31050_cal1 (data #1, data #2, 0, 0, 0, 0, 0, 0, 0.1, 0.9, 0, 0, -33000, -33000, -33000, 14, &C0, &C1, &C2,
&C3, &C4, &C6, &C5, &C7 );
nd
2
order non-linearity compensation (three points at 10%, 50%, and 90%, no temperature compensation)
ZMD31050_cal1 (data #1, data #2, 0, data #3, 0, 0, 0, 0, 0.1, 0.9, 0, 0.5, -33000, -33000, -33000, 14, &C0,
&C1, &C2, &C3, &C4, &C6, &C5, &C7 );
rd
3 order non-linearity compensation (four points at 10%, 50%, 70%, and 90%, no temperature compensation)
ZMD31050_cal1 (data #1, data #2, data #4, data #3, 0, 0, 0, 0, 0.1, 0.9, 0.7, 0.5, -33000, -33000, -33000, 14,
&C0, &C1, &C2, &C3, &C4, &C6, &C5, &C7 );
rd
nd
3 order non-linearity and 2 order temperature compensation (8 points for sensor and 3 points for temperature)
ZMD31050_cal1 (data #1, data #2, data #4, data #3, data #5, data #6, data #7, data #8, 0.1, 0.9, 0.7, 0.5,
temp#1, temp#2, temp#3, 14, &C0, &C1, &C2, &C3, &C4, &C6, &C5, &C7 );
TQuad (temp#1, temp#2, temp#3, 0.27, 0.71, 0.42, 14, &Ct0, &Ct1, &Ct2);
2.4.
EEPROM Programming
Programming of the SSC IC can be done via the Evaluation Software provided for each SSC IC. Software can be
downloaded from the product page on www.ZMDi.com.
Refer to the Evaluation Kit Description for the SSC IC for further details.
Application Note
July 9, 2015
© 2015 Zentrum Mikroelektronik Dresden AG — Rev. 1.00
All rights reserved. The material contained herein may not be reproduced, adapted, merged, translated, stored, or used without the
prior written consent of the copyright owner. The information furnished in this publication is subject to changes without notice.
11 of 13
RBIC1 Calibration DLL
ZSC31050 / ZSC31150 / ZSSC313x / ZSSC3154 / ZSSC3170
2.5.
Verification
Figure 2.5 Calculation and Measurement Results
Digital readout:
After successful calibration, the output of the SSC IC should vary between the target limits specified during
calibration. For digital data, the readout values match the resolution of the data format used.
For analog output, the output voltage is generated using a resistor-string digital-to-analog converter (DAC) with
5632 steps, of which 5120 steps (256 to 5375) can be addressed. As a result, an adjustable range from 5% to
95% of the supply voltage is guaranteed, including all possible tolerances.
Visit ZMDI’s website www.ZMDi.com or contact your nearest sales office for the latest version of various support
documents.
Application Note
July 9, 2015
© 2015 Zentrum Mikroelektronik Dresden AG — Rev. 1.00
All rights reserved. The material contained herein may not be reproduced, adapted, merged, translated, stored, or used without the
prior written consent of the copyright owner. The information furnished in this publication is subject to changes without notice.
12 of 13
RBIC1 Calibration DLL
ZSC31050 / ZSC31150 / ZSSC313x / ZSSC3154 / ZSSC3170
3
Glossary
Term
Description
ADC
Analog-to-Digital Converter
DAC
Digital to Analog Converter
DLL
Dynamic-Link Library
SSC
Sensor Signal Conditioner
4
Document Revision History
Revision
1.00
Date
Description
July 9, 2015
First release.
Sales and Further Information
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[email protected]
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Dresden AG
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Central Office:
Phone +49.351.8822.306
Fax
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USA Phone 1.855.275.9634
Phone +1.408.883.6310
Fax
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Fax
+49.351.8822.87.772
DISCLAIMER: This information applies to a product under development. Its characteristics and specifications are subject to change without notice.
Zentrum Mikroelektronik Dresden AG (ZMD AG) assumes no obligation regarding future manufacture unless otherwise agreed to in writing. The
information furnished hereby is believed to be true and accurate. However, under no circumstances shall ZMD AG be liable to any customer,
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tort (including negligence), strict liability, or otherwise.
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Fax
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Application Note
July 9, 2015
Zentrum Mikroelektronik
Dresden AG, Japan Office
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Fax
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+82.504.841.3026
© 2015 Zentrum Mikroelektronik Dresden AG — Rev. 1.00
All rights reserved. The material contained herein may not be reproduced, adapted, merged, translated, stored, or used without the
prior written consent of the copyright owner. The information furnished in this publication is subject to changes without notice.
13 of 13