Data Sheet

Data Sheet
Rev. 1.21/ July 2015
ZSC31050
Advanced Differential Sensor Signal Conditioner
Multi-Market Sensing Platforms
Precise and Deliberate
ZSC31050
Advanced Differential Sensor Signal Conditioner
Brief Description
Features
ZSC31050 is a CMOS integrated circuit for highly
accurate amplification and sensor-specific correction
of bridge sensor and temperature sensor signals.
The device provides digital compensation of sensor
offset, sensitivity, temperature drift, and non-linearity
via a 16-bit RISC microcontroller running a polynomial correction algorithm.
 Digital compensation of sensor offset, sensitivity,
The ZSC31050 accommodates virtually any bridge
sensor type (e.g., piezo-resistive, ceramic thick-film,
or steel membrane based). In addition, it can interface to a separate temperature sensor. The bi-direc2
tional digital interfaces (I C™*, SPI, and ZACwire™)
can be used for a simple PC-controlled one-pass
calibration procedure to program a set of calibration
coefficients into an on-chip EEPROM. A specific
sensor and a ZSC31050 can be mated digitally: fast,
precise and without the cost overhead associated
with trimming by external devices or laser. The
ZACwire™ interface enables an end-of-line calibration of the sensor module.

Typical applications for the ZSC31050 include industrial, medical, and consumer products. It is specifically engineered for most resistive bridge sensors;
e.g., sensors for measuring pressure, force, torque,
acceleration, angle, position, and revolution.









temperature drift, and nonlinearity
Accommodates nearly all resistive bridge sensor
types (signal spans from 1mV/V up to 275mV/V)
Digital one-pass calibration: quick and precise
Selectable compensation temperature source:
bridge, thermistor, or internal or external diode
Output options: voltage (0 to 5V), current
2
(4 to 20mA), PWM, I C™, SPI, ZACwire™
(one-wire interface), alarm
Adjustable output resolution (up to 15 bits) versus
sampling rate (up to 3.9kHz)
Current consumption: 2.5mA (typical)
Selectable bridge excitation: ratiometric voltage,
constant voltage, or constant current
Input channel for separate temperature sensor
Sensor connection and common mode check
(sensor aging detection)
AEC-Q100 qualification (temperature grade 0)
Physical Characteristics
 Operation temperature -40 to +125°C (-40 to
+150°C de-rated, depending on product version)
 Supply voltage: 2.7 to 5.5 V; with external JFET:
5 to 40 V
 Available in SSOP16 package or as die
Benefits
 No external trimming components required
 PC-controlled configuration and calibration via
ZSC31050 Overview
digital bus interface – simple, low cost
 High accuracy (±0.1% FSO @ -25 to 85°C;
±0.25% FSO @ -40 to 125°C)
VCC
†
Available Support
 Evaluation kit available
Sensor
Module
ZSC31050
OUT
 Support for industrial mass calibration available
 Quick circuit customization possible for large
production volumes
GND
* I2C™ is a trademark of NXP.
†
Digital output signal.
For more information, contact ZMDI via [email protected]
© 2015 Zentrum Mikroelektronik Dresden AG — Rev. 1.21 —July 27, 2015. 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.
ZSC31050
Advanced Differential Sensor Signal Conditioner
ZSC31050 Block Diagram
Ext. Temp. Sens.
IR_TEMP
CTRL-REGS
SIF
VBR
+
Gain
Factor

Temp. Sens.
Select
PCOMP
ADC Mode
Offset
Shift
RAM
VINP
PGA
MUX
ADC
CMC
DAC
FIO1
OUT /
OWI
PWM
FIO2
IO1
IO2
VINN
Analog Front-End (AFE)
SCL
SDA
EEPROM
Int. Temp. Sensor
External
Temperature
Sensor
Digital Section
Sensor Bridge
Typical Applications:
Interfaces
IN3
Consumer Goods
Industrial Applications
Portable Devices
Automotive Sensors*








Weight scales
Flow meters
Strain gauges
Load meters
HVAC


4-20mA transmitters
Intelligent sensor networks
Process automation
Factory automation

Altimeters
Blood pressure
monitors


Oil pressure
Temperature sensing
Strain gauges
* AEC-Q100 qualified
Ordering Information (Please refer to section 8 in the data sheet for additional options.)
Product Sales Code
Description
Package
ZSC31050FEB
ZSC31050 Die — Temperature range: -40°C to +150°C
Unsawn on Wafer
ZSC31050FEC
ZSC31050 Die — Temperature range: -40°C to +150°C
Sawn on Wafer Frame
ZSC31050 SSOP-16 — Temperature range: -40°C to +150°C
Tube: add “-T” to sales code
Reel: add “-R”
ZSC31050KIT Evaluation
Kit V3.1
Modular ZSC31050 SSC Evaluation Kit: three interconnecting
boards, five ZSC31050 SSOP-16 samples
Kit
ZSC31050 Mass
Calibration System V1.1
Modular Mass Calibration System (MSC) for ZSC31050: MCS
boards, cable, connectors
Kit
ZSC31050FEG1
Sales and Further Information
www.zmdi.com
[email protected]
Zentrum Mikroelektronik
Dresden AG
Global Headquarters
Grenzstrasse 28
01109 Dresden, Germany
ZMD America, Inc.
1525 McCarthy Blvd., #212
Milpitas, CA 95035-7453
USA
Central Office:
Phone +49.351.8822.306
Fax
+49.351.8822.337
USA Phone 1.855.275.9634
Phone +1.408.883.6310
Fax
+1.408.883.6358
European Technical Support
Phone +49.351.8822.7.772
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,
licensee, or any other third party for any special, indirect, incidental, or consequential damages of any kind or nature whatsoever arising out of or
in any way related to the furnishing, performance, or use of this technical data. ZMD AG hereby expressly disclaims any liability of ZMD AG to any
customer, licensee or any other third party, and any such customer, licensee and any other third party hereby waives any liability of ZMD AG for
any damages in connection with or arising out of the furnishing, performance or use of this technical data, whether based on contract, warranty,
tort (including negligence), strict liability, or otherwise.
European Sales (Stuttgart)
Phone +49.711.674517.55
Fax
+49.711.674517.87955
Zentrum Mikroelektronik
Dresden AG, Japan Office
2nd Floor, Shinbashi Tokyu Bldg.
4-21-3, Shinbashi, Minato-ku
Tokyo, 105-0004
Japan
ZMD FAR EAST, Ltd.
3F, No. 51, Sec. 2,
Keelung Road
11052 Taipei
Taiwan
Phone +81.3.6895.7410
Fax
+81.3.6895.7301
Phone +886.2.2377.8189
Fax
+886.2.2377.8199
Zentrum Mikroelektronik
Dresden AG, Korea Office
U-space 1 Building
Unit B, 906-1
660, Daewangpangyo-ro
Bundang-gu, Seongnam-si
Gyeonggi-do, 463-400
Korea
Phone +82.31.950.7679
Fax
+82.504.841.3026
© 2015 Zentrum Mikroelektronik Dresden AG — Rev. 1.21 —July 27, 2015.
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.
ZSC31050
Advanced Differential Sensor Signal Conditioner
Contents
1
2
3
4
5
6
7
8
Electrical Characteristics ............................................................................................................................... 6
1.1. Absolute Maximum Ratings .................................................................................................................... 6
1.2. Operating Conditions .............................................................................................................................. 6
1.3. Inherent Characteristics .......................................................................................................................... 8
1.3.1. Cycle Rate versus ADC Resolution ................................................................................................. 9
1.3.2. PWM Frequency .............................................................................................................................. 9
1.4. Electrical Parameters ........................................................................................................................... 10
1.4.1. Supply/ Regulation ......................................................................................................................... 10
1.4.2. Analog Front End ........................................................................................................................... 10
1.4.3. DAC and Analog Output (OUT Pin) ............................................................................................... 10
1.4.4. PWM Output (OUT Pin, IO1 Pin) ................................................................................................... 10
1.4.5. Temperature Sensors (IR_TEMP Pin) ........................................................................................... 10
1.4.6. Digital Outputs (IO1, IO2, OUT Pins in Digital Mode) .................................................................... 11
1.4.7. System Response .......................................................................................................................... 11
1.5. Interface Characteristics ....................................................................................................................... 12
2
1.5.1. Multiport Serial Interfaces (I C™, SPI) .......................................................................................... 12
1.5.2. One-Wire Serial Interface (ZACwire™) ......................................................................................... 12
Circuit Description ....................................................................................................................................... 13
2.1. Signal Flow ........................................................................................................................................... 13
2.2. Application Modes ................................................................................................................................ 14
2.3. Analog Front-End (AFE) ....................................................................................................................... 15
2.3.1. Programmable Gain Amplifier (PGA) ............................................................................................. 15
2.3.2. Extended Zero Point Compensation (XZC) ................................................................................... 16
2.3.3. Measurement Cycle Performed by Multiplexer .............................................................................. 17
2.3.4. Analog-to-Digital Converter ............................................................................................................ 18
2.4. System Control ..................................................................................................................................... 19
2.5. Output Stage......................................................................................................................................... 20
2.5.1. Analog Output ................................................................................................................................ 21
2.5.2. Comparator Module (ALARM Output) ........................................................................................... 22
2.5.3. Serial Digital Interface .................................................................................................................... 22
2.6. Voltage Regulator ................................................................................................................................. 23
2.7. Watchdog and Error Detection ............................................................................................................. 23
Application Circuit Examples ....................................................................................................................... 24
ESD/Latch-Up-Protection ............................................................................................................................ 25
Pin Configuration and Package ................................................................................................................... 26
Reliability ..................................................................................................................................................... 27
Customization .............................................................................................................................................. 27
Ordering Information ................................................................................................................................... 28
Data Sheet
July 27, 2015
© 2015 Zentrum Mikroelektronik Dresden AG — Rev. 1.21
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 32
ZSC31050
Advanced Differential Sensor Signal Conditioner
9 Related Documents ..................................................................................................................................... 29
10 Glossary ...................................................................................................................................................... 30
11 Document Revision History ......................................................................................................................... 31
List of Figures
Figure 2.1
Figure 2.2.
Figure 3.1
Figure 3.2
Figure 3.3
Figure 3.4
Figure 3.5
Figure 5.1.
Block Diagram of the ZSC31050 ................................................................................................... 13
Measurement Cycle ZSC31050 ..................................................................................................... 17
Application Example 1 ................................................................................................................... 24
Application Example 2 ................................................................................................................... 24
Application Example 3 ................................................................................................................... 24
Application Example 4 ................................................................................................................... 24
Application Example 5 ................................................................................................................... 25
Pin Configuration ........................................................................................................................... 27
List of Tables
Table 1.1
Table 1.2
Table 1.3
Table 1.4
Table 1.5
Table 1.6
Table 1.7.
Table 2.1
Table 2.2
Table 2.3
Table 2.4.
Table 2.5.
Table 5.1.
Data Sheet
July 27, 2015
Absolute Maximum Ratings ............................................................................................................. 6
Operating Conditions ....................................................................................................................... 6
Inherent Characteristics ................................................................................................................... 8
Cycle Rate versus ADC Resolution ................................................................................................. 9
PWM Frequency .............................................................................................................................. 9
Electrical Parameters ..................................................................................................................... 10
Interface Characteristics ................................................................................................................ 12
Adjustable Gains, Resulting Sensor Signal Spans, and Common Mode Ranges ........................ 15
Extended Zero Point Compensation (XZC) Range ....................................................................... 16
Output Resolution versus Sample Rate ........................................................................................ 19
Output Configurations Overview .................................................................................................... 20
Analog Output Configuration ......................................................................................................... 21
Pin Configuration ........................................................................................................................... 26
© 2015 Zentrum Mikroelektronik Dresden AG — Rev. 1.21
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 32
ZSC31050
Advanced Differential Sensor Signal Conditioner
1
Electrical Characteristics
1.1. Absolute Maximum Ratings
The absolute maximum ratings are stress ratings only. The ZSC31050 might not function or be operable above
the recommended operating conditions. Stresses exceeding the absolute maximum ratings might also damage
the device. In addition, extended exposure to stresses above the recommended operating conditions might affect
device reliability. ZMDI does not recommend designing to the “Absolute Maximum Ratings.”
Table 1.1
Absolute Maximum Ratings
No.
Parameter
Symbol
Conditions
Min
Max
Unit
1.1.1
Digital supply voltage
VDDMAX
To VSS
-0.3
6.5
V DC
1.1.2
Analog supply voltage
VDDAMAX
To VSS
-0.3
6.5
V DC
1.1.3
Voltage at all analog and digital
I/O pins except FBP, SDA, SCL
(see 1.1.4, 1.1.5, and 1.1.6)
-0.3
VDDA+0.3
V DC
1.1.4
Voltage at FBP pin
VFBP_MAX
4 mA to 20mA – Interface
-1.2
VDDA+0.3
V DC
1.1.5
Voltage at SDA pin
VSDA_MAX
I²C™ mode only
-0.3
5.5
V DC
1.1.6
Voltage at SCL pin
VSCL_MAX
I²C™ mode only
-0.3
5.5
V DC
1.1.7
Storage temperature
-45
150
C
1.2.
VA_I/O,
VD_I/O
TSTG
Operating Conditions
Unless otherwise noted, voltages are relative to VSS and analog-to-digital conversion = 2
13 bits, gain 210, fclk2.25MHz.
nd
order, resolution =
For specifications marked with an asterisk (*), there is no measurement in mass production—the parameter is
guaranteed by design and/or quality observations.
Note: See important notes at the end of the table.
Table 1.2
Operating Conditions
No.
1.2.1
1.2.2
Parameter
Conditions
Min
Typical
Max
Unit
-40
150
C
1.2.1.1 TQE ambient
temperature range for part
numbers ZSC31050xExx
TAMB_TQE
1.2.1.2 TQA ambient
temperature range for part
numbers ZSC31050xAxx
TAMB_TQA
-40
125
C
1.2.1.3 TQI ambient
temperature range for part
numbers ZSC31050xIxx
TAMB_TQI
-25
85
C
Ambient temperature
EEPROM programming
TAMB_EEP
-25
85
C
Data Sheet
July 27, 2015
Symbol
Operation life time <
1000h @ 125 to 150C
© 2015 Zentrum Mikroelektronik Dresden AG — Rev. 1.21
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 32
ZSC31050
Advanced Differential Sensor Signal Conditioner
No.
Parameter
Symbol
1.2.3
EEPROM programming
cycles
1.2.4
Data retention (EEPROM)
1.2.5
Analog supply voltage
1.2.6
Analog supply voltage
advanced performance
1.2.7
Digital supply voltage
Conditions
Min
Typical
Max
Unit
100
Average temp. < 85C
15
VDDA
Ratiometric mode
2.7
5.5
V DC
VDDAADV
Ratiometric mode
4.5
5.5
V DC
1.05
VDDA
VDD
years
Externally powered
2.7
V DC
V DC
1.2.8
External supply voltage
VSUPP
Voltage Regulator Mode
1
with external JFET
VDDA +
2V
1.2.9
Common mode input range
VIN_CM
Depends on gain adjust;
refer to section 2.3.1.
0.21
0.76
VADC_REF
1.2.10
Input voltage FBP pin
VIN_FBP
-1
VDDA
V DC
RBR
3.0
25.0
k
25.0
k
1.2.11
Sensor bridge resistance
(over full temperature
range)
2
RBR_CL
Current loop interface,
4 to 20mA
5.0
1.2.12
Reference resistor for
bridge current source *
RBR_REF
Bridge current
IBR = VDDA / (16·RBR_REF)
0.07
1.2.13
Stabilization capacitor *
CVDDA
External capacitor
between VDDA and VSS
50
100
470
nF
1.2.14
VDD stabilization
3
capacitor*
CVDD
Between VDD
and VSS, external
0
100
470
nF
1.2.15
Maximum load capacitance
4
allowed at OUT
CL_OUT
Output Voltage Mode
50
nF
1.2.16
Minimum load resistance
allowed
RL_OUT
Output Voltage Mode
1.2.17
Maximum load capacitance
allowed at VGATE
CL_VGATE
Total capacitance relative
to all potentials
5
RBR
2
k
10
nF
1.
Maximum depends on the breakdown voltage of the external JFET; refer to the application recommendations in the ZSC31050
Application Note—0-10V Output.
2.
No minimum limitation with an external connection between VDDA and VBR.
3.
Lower stabilization capacitors can increase noise level at the output.
4.
If maximum is used, consider the special requirements of the ZACwire™ interface stated in the ZSC31050 Functional Description,
section 4.3.
5.
VADC_REF: Reference voltage of the Analog to Digital Converter (VBR or VDDA).
Data Sheet
July 27, 2015
© 2015 Zentrum Mikroelektronik Dresden AG — Rev. 1.21
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 32
ZSC31050
Advanced Differential Sensor Signal Conditioner
1.3. Inherent Characteristics
For specifications marked with an asterisk (*), there is no measurement in mass production—the parameter is
guaranteed by design and/or quality observations.
Table 1.3
Inherent Characteristics
No.
Parameter
Symbol
1.3.1
Selectable input span,
bridge sensor measurement
VIN_SP
1.3.2
Analog offset comp range
(6 bit setting)
Conditions
Refer to section 2.3.1.
Maximum bias current
rADC
Min
1
2
Max
Unit
2
280
mV/V
-20
20
Counts
-25
25
Counts
9
15
Bits
10
90
%VDDA
1.3.3
Analog-to-digital conversion
(ADC) resolution
1.3.4
ADC input range
1.3.5
Digital-to-analog conversion
(DAC) resolution
rDAC
1.3.6
PWM resolution
rPWM
9
1.3.7
Bias current for external
temperature diodes
ITS
8
1.3.8
Sensitivity internal
3
temperature diode
1.3.9
Clock frequency*
3-bit setting
Range
STT_SI
fCLK
11
At analog output
Raw values without
conditioning
Guaranteed adjustment range
Typ
Bits
12
Bits
18
40
A
2800
3200
3600
ppm
FS/K
1
2
4
MHz
1.
Set configuration word ADJREF:BCUR ( bits 4-6) to 111 (for details, see the ZSC31050 Functional Description).
2.
15-bit resolution is not applicable for 1st order ADC and not recommended for sensors with high nonlinearity behavior.
3.
FS = Full scale.
Data Sheet
July 27, 2015
© 2015 Zentrum Mikroelektronik Dresden AG — Rev. 1.21
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 32
ZSC31050
Advanced Differential Sensor Signal Conditioner
1.3.1.
Cycle Rate versus ADC Resolution
The following specifications are guaranteed by design and/or quality observations.
Important Note: Combining first-order configuration of the ADC with 15-bit resolution is not allowed.
Table 1.4
Cycle Rate versus ADC Resolution
ADC Order
(OADC)
1
2
1.3.2.
Conversion Cycle fCYC
Resolution
rADC
fCLK=2MHz
fCLK=2.25MHz
[Bit]
[Hz]
[Hz]
9
1302
1465
10
781
879
11
434
488
12
230
259
13
115
129
14
59
67
11
3906
4395
12
3906
4395
13
1953
2197
14
1953
2197
15
977
1099
PWM Frequency
The following specifications are not measured in mass production; they are guaranteed by design and/or quality
observations.
Table 1.5
PWM Frequency
PWM
Resolution
rPWM [Bit]
PWM Frequency in Hz at 2 MHz Clock
1
PWM Frequency in Hz at 2.25 MHz Clock
Clock Divider
2
Clock Divider
1
0.5
0.25
0.125
1
0.5
0.25
0.125
9
3906
1953
977
488
4395
2197
1099
549
10
1953
977
488
244
2197
1099
549
275
11
977
488
244
122
1099
549
275
137
12
488
244
122
61
549
275
137
69
1.
Internal RC oscillator: coarse adjustment to 1, 2 and 4 MHz, fine-tuning +/- 25%; external clock is also possible.
2.
Internal RC oscillator: coarse adjustment to 1.125, 2.25 and 4.5 MHz, fine-tuning +/- 25%; external clock is also possible.
Data Sheet
July 27, 2015
© 2015 Zentrum Mikroelektronik Dresden AG — Rev. 1.21
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 32
ZSC31050
Advanced Differential Sensor Signal Conditioner
1.4.
Electrical Parameters
Unless otherwise noted, voltages are relative to VSS and analog-to-digital conversion = 2
resolution = 13 bits, gain 210, fclk2.25MHz.
nd
order,
Note: See important notes at the end of the table.
Table 1.6
Electrical Parameters
No.
1.4.1.
Parameter
Symbol
Supply current
1.4.1.2
Supply current for
current loop
1.4.1.3
Temperature coefficient
voltage reference *
ISUPP
ISUPP_CL
Max
Unit
Without bridge and load current,
bias adjustment  4, fCLK2.4MHz
2.5
4
mA
Without bridge current,
fCLK1.2MHz,
1
bias adjustment  1
2.0
2.75
mA
±50
200
ppm/K
-2 to -10
2 to 10
nA
0.025
0.975
VDDA
0.95
LSB
4
LSB
TCREF
Parasitic differential input
offset current *
IIN_OFF
-200
Temperature range =
TAMB_TQI (-40 to 85C)
DAC and Analog Output (OUT Pin)
2
VOUT_SR
Voltage Mode, RLOAD > 2KΩ
VDDAADV
Temperature range = TAMB_TQI
DNLOUT
VDDAADV
Temperature range = TAMB_TQI
1.4.3.1
Output signal range
1.4.3.2
Output DNL
1.4.3.3
Output INL
1.4.3.4
Output slew rate *
SROUT
1.4.3.5
Short circuit current *
IOUT_max
1.4.3.6
Addressable output
signal range *
VOUT_ADR
1.4.4.
Typ
Analog Front End
1.4.2.1
1.4.3.
Min
Supply/ Regulation
1.4.1.1
1.4.2.
Conditions
3
INLOUT
Voltage Mode
Load capacitance <20nF
Using conditions of 1.4.3.1
0.1
5
2048 steps
10
0
20
mA
1
VDDA
PWM Output (OUT Pin, IO1 Pin)
1.4.4.1
PWM high voltage
VPWM_H
Load resistance > 10k
1.4.4.2
PWM low voltage
VPWM_L
Load resistance > 10k
1.4.4.3
PWM output slew rate *
SRPWM
Load capacitance < 1nF
15
At rADC = 13 bits
75
1.4.5.
V/s
0.9
VDDA
0.1
VDDA
V/s
Temperature Sensors (IR_TEMP Pin)
1.4.5.1
Sensitivity external diode
/ resistor meas.
Data Sheet
July 27, 2015
STTS_E
210
© 2015 Zentrum Mikroelektronik Dresden AG — Rev. 1.21
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.
µV/LSB
10 of 32
ZSC31050
Advanced Differential Sensor Signal Conditioner
No.
1.4.6.
Parameter
Symbol
Conditions
Min
Typ
Max
Unit
Digital Outputs (IO1, IO2, OUT Pins in Digital Mode)
1.4.6.1
Output high level
VDOUT_H
Load resistance > 1 k
1.4.6.2
Output low level
VDOUT_L
Load resistance > 1 k
1.4.6.3
Output current *
IDOUT
1.4.7.
System Response
4
1.4.7.1
Startup time
1.4.7.2
Response time *
1.4.7.3
Overall accuracy
(deviation from ideal line
including INL, gain, and
5
offset errors) *,
0.9
VDDA
0.1
4
st
tSTA
Power-on to 1 measurement result
at output
2
tRESP
66% change in input signal; refer to
Table 2.3 for fCON.
1.66
ACOUT
VDDA
mA
5
ms
3.66
1/fCON
TAMB_TQI (-25 to 85 C) & VDDAADV
0.10
%
TAMB_TQA (-40 to 125 C) & VDDAADV
0.25
%
TAMB_TQE (-40 to 150 C) & VDDAADV
0.50
%
2.66
1.4.7.4
Analog output noise:
peak-to-peak *
VNOISE, PP
Shorted inputs, gain  210
bandwidth  10kHz
10
mV
1.4.7.5
Analog output noise:
RMS *
VNOISE, RMS
Shorted inputs, gain  210
bandwidth  10kHz
3
mV
1.4.7.6
Ratiometricity error
REOUT_5V
±5% respectively 1000ppm ±10%
(5V)
500
ppm
REOUT_3V
±5% respectively 2000ppm ±10%
(3V)
1000
ppm
1.
Recommended bias adjustment  4; note the application recommendations and power consumption adjustment constraints given
in the ZSC31050 Application Note—Current Loop.
2.
De-rated performance in lower part of supply voltage range (2.7 to 3.3V): 2.5 to 5 %VDDA and 95 to 97.5%VDDA.
3.
Output linearity and accuracy can be enhanced by an additional analog output stage calibration.
4.
OWI, start window disabled (depending on resolution and configuration, start routine begins approximately 0.8ms after power-on).
5.
Accuracy better than 0.5% requires offset and gain calibration for the analog output stage; parameter only for ratiometric output.
The current loop application is verified and validated for 5V operation only and external supply >7V (upper limit is dependent on
the external components used). Accuracy and temperature range should be validated based on the schematic design used. Refer
to the ZSC31050 Application Note—Current Loop for more information.
*
For specifications marked with an asterisk (*), there is no measurement in mass production—the parameter is guaranteed by
design and/or quality observations.
Data Sheet
July 27, 2015
© 2015 Zentrum Mikroelektronik Dresden AG — Rev. 1.21
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 32
ZSC31050
Advanced Differential Sensor Signal Conditioner
1.5. Interface Characteristics
Table 1.7.
Interface Characteristics
No.
1.5.1.
Parameter
Symbol
Min
Typ
Max
Unit
0.7
1
VDDA
-
5.5
V DC
0
0.3
VDDA
VI2C_OUT_L
0.1
VDDA
400
pF
400
kHz
2
Multiport Serial Interfaces (I C™, SPI)
1.5.1.1
Input high level
1
VI2C_IN_H
1.5.1.2
Input low level
1.5.1.3
Output low level
1.5.1.4
Load capacitance at the
SDA pin
CSDA
1.5.1.5
Clock frequency at the
2
SCL pin
fSCL
1.5.1.6
Pull-up resistor
RI2C_PU
1.5.1.7
Input capacitance
(each pin)
CI2C_IN
1.5.2.
Conditions
VI2C_IN_L
fCLK ≥ 2MHz

500
10
Also valid for SPI.
pF
One-Wire Serial Interface (ZACwire™)
1.5.2.1
OWI start window
tOWI_start
1.5.2.2
Pull-up resistance
master
ROWI_PU
1.5.2.3
OWI load capacitance
1.5.2.4
Voltage level low
VOWI_L
1.5.2.5
Voltage level high
VOWI_H
COWI_LOAD
20
20s < tOWI_BIT < 100s
0.08
tOWI_BIT /
ROWI_PU
0.2
VDDA
0.75
The maximum value in V DC is independent from VDDA in I²C™ Mode.
2.
Internal clock frequency fCLK must be at least 5 times higher than the communication clock frequency.
July 27, 2015

330
1.
Data Sheet
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VDDA
12 of 32
ZSC31050
Advanced Differential Sensor Signal Conditioner
2
Circuit Description
Note: This data sheet provides specifications and a general overview of ZSC31050 operation. For details of
operation, including configuration settings and related EEPROM registers, refer to the ZSC31050 Functional
Description.
2.1. Signal Flow
The ZSC31050’s signal path includes both analog (shown in pink in Figure 2.1) and digital (blue) sections. The
analog path is differential; i.e., the differential bridge sensor signal is handled internally via two signal lines that
are symmetrical around a common mode potential (analog ground = VDDA/2), which improves noise rejection.
Therefore it is possible to amplify positive and negative input signals, which are located in the common mode
range of the signal input.
Figure 2.1
Block Diagram of the ZSC31050
Ext. Temp. Sens.
IR_TEMP
CTRL-REGS
SCL
SDA
SIF
VBR
+
Gain
Factor

Temp. Sens.
Select
PCOMP
ADC Mode
Offset
Shift
RAM
VINP
PGA
MUX
ADC
CMC
DAC
FIO1
OUT /
OWI
PWM
FIO2
IO1
IO2
VINN
Analog Front-End (AFE)
EEPROM
Int. Temp. Sensor
External
Temperature
Sensor
Digital Section
Sensor Bridge
Interfaces
IN3
PGA
Programmable Gain Amplifier
MUX
Multiplexer
ADC
Analog-to-Digital Converter
CMC
Calibration Microcontroller
DAC
Digital-to-Analog Converter
FIO1
Flexible I/O 1: Analog Out (voltage/current), PWM2, ZACwire™ (one-wire-interface)
FIO2
Flexible I/O 2: PWM1, SPI Data Out, SPI Slave Select, Alarm1, Alarm2
SIF
Serial interface: I C™ Data I/O, SPI Data In, Clock
PCOMP
Programmable Comparator
EEPROM
Nonvolatile Memory for Calibration Parameters and Configuration
TS
On-Chip Temperature Sensor (pn-junction)
ROM
Memory for Correction Formula and Algorithm
PWM
PWM Module
Data Sheet
July 27, 2015
2
© 2015 Zentrum Mikroelektronik Dresden AG — Rev. 1.21
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13 of 32
ZSC31050
Advanced Differential Sensor Signal Conditioner
The differential signal from the bridge sensor is pre-amplified by the programmable gain amplifier (PGA). The
multiplexer (MUX) transmits the signals from the bridge sensor, external diode, or separate temperature sensor to
the ADC in a specific sequence (the internal pn-junction (TS) can be used instead of the external temperature
diode). Next, the ADC converts these signals into digital values.
The digital signal correction takes place in the calibration microcontroller (CMC). It is based on a special
correction formula located in the ROM and sensor-specific coefficients (stored in the EEPROM during calibration).
Depending on the programmed output configuration, the corrected sensor signal is output as an analog value, a
2
PWM signal, or a digital value in the format of SPI, I C™, or ZACwire™. The output signal is provided at two
flexible I/O modules (FIO) and at the serial interface (SIF). The configuration data and the correction parameters
can be programmed into the EEPROM via the digital interfaces.
The modular circuit concept used in the design of the ZSC31050 allows fast customization of the IC for highvolumn applications if needed. Circuit blocks and functions can be added or removed, which can reduce the die
size (see section 7 for more details).
2.2. Application Modes
For each application, a configuration set must be established (generally prior to calibration) by programming the
on-chip EEPROM regarding to the following modes:

Sensor channel

Sensor mode: ratiometric voltage or current supply mode.

Input range: the gain of the analog front end must be chosen with respect to the maximum sensor signal
span, which also requires adjusting the zero point of the ADC.

Additional offset compensation, the Extended Zero-Point Compensation (XZC), must be enabled if
required; e.g., if the sensor offset voltage is close to or larger than the sensor span.

Resolution/response time: The ADC must be configured for resolution and conversion settings (1st or 2nd
order). These settings influence the sampling rate, signal integration time, and, as a result, the noise
immunity.

Polarity of the sensor bridge inputs: this allows inverting the sensor bridge inputs
 Analog output


Choice of output type (voltage value, current loop, or PWM) for output register 1.
Optional additional output register 2: PWM via IO1 pin or alarm out module via IO1 or IO2 pin .
 Digital communication: The protocol and its parameters must be selected.
 Temperature


The temperature sensor type for the temperature correction must be chosen (only main channel (T1) is
usable for correction).
Optional: a secondary temperature sensor (T2) can be chosen as a second sensor output.
 Supply voltage: For non-ratiometric output, the voltage regulation must be configured.
Note:
Not all possible combinations of settings are allowed (see section 2.5).
Data Sheet
July 27, 2015
© 2015 Zentrum Mikroelektronik Dresden AG — Rev. 1.21
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written consent of the copyright owner. The information furnished in this publication is subject to changes without notice.
14 of 32
ZSC31050
Advanced Differential Sensor Signal Conditioner
The calibration procedure must include establishing the coefficients for calibration calculation and the following
steps depending on configuration:

Adjustment of the extended offset compensation

Zero compensation of temperature measurement

Adjustment of the bridge current

Settings for the reference voltage if using the reference voltage

Settings for the thresholds and delays for the alarms if using the alarms
2.3. Analog Front-End (AFE)
The analog front-end consists of the programmable gain amplifier (PGA), the multiplexer (MUX), and the analogto-digital converter (ADC).
2.3.1.
Programmable Gain Amplifier (PGA)
The following tables show the adjustable gains, the processable sensor signal spans, and the common mode
range allowed.
Table 2.1
§
Adjustable Gains, Resulting Sensor Signal Spans, and Common Mode Ranges
No.
PGA Gain aIN
Gain Amp1
Gain Amp2
Gain Amp3
Max. Span
VIN_SP in mV/V
Input Range
§
VIN_CM in % VDDA
1
420
30
7
2
2
43 to 57
2
280
30
4.66
2
3
40 to 59
3
210
15
7
2
4
43 to 57
4
140
15
4.66
2
6
40 to 59
5
105
15
3.5
2
8
38 to 62
6
70
7.5
4.66
2
12
40 to 59
7
52.5
7.5
3.5
2
16
38 to 62
8
35
3.75
4.66
2
24
40 to 59
9
26.3
3.75
3.5
2
32
38 to 62
10
14
1
7
2
50
43 to 57
11
9.3
1
4.66
2
80
40 to 59
12
7
1
3.5
2
100
38 to 62
13
2.8
1
1.4
2
280
21 to 76
Bridge in voltage mode; refer to the ZSC31050 Functional Description for the usable input signal / common mode range at the bridge in
current mode.
Data Sheet
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© 2015 Zentrum Mikroelektronik Dresden AG — Rev. 1.21
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written consent of the copyright owner. The information furnished in this publication is subject to changes without notice.
15 of 32
ZSC31050
Advanced Differential Sensor Signal Conditioner
2.3.2.
Extended Zero Point Compensation (XZC)
The ZSC31050 supports two methods of sensor offset cancellation (zero shift):
 Digital offset correction
 XZC – an analog cancellation for large offset values (up to approximately 300% of span)
The digital sensor offset correction is processed at the digital signal correction/conditioning by the CMC. The XZC
analog sensor offset pre-compensation is needed for compensation of large offset values, which would overdrive
the analog signal path due to uncompensated amplification. For analog sensor offset pre-compensation, a
compensation voltage is added in the analog pre-gaining signal path (coarse offset removal). The analog offset
compensation in the AFE can be adjusted by 6 EEPROM bits as described in the ZSC31050 Functional
Description. It allows an analog zero-point shift of up to 300% of the processable signal span.
The zero-point shift ZXZC of the temperature measurements can also be adjusted by 6 EEPROM bits
(recommended ZXZC= -20 to +20). It is calculated by equation (1):
V XZC
k  Z XZC

VDDBR
20  aIN
(1)
Where
VXZC
=
Extended zero compensation voltage
VDDBR =
Bridge voltage
k
=
Calculation factor
aIN
=
Input gain
Table 2.2
Extended Zero Point Compensation (XZC) Range
PGA Gain
aIN
Max. Span
VIN_SP
(mV/V)
Calculation
Factor k
Offset Shift
per Step
(% Full Span)
Approx. Maximum
Offset Shift
(mV/V)
Approx. Maximum Shift
(% VIN_SP)
(@ ± 20 Steps)
420
2
3.0
15%
+/- 7
330
280
3
1.833
9%
+/- 6
200
210
4
3.0
15%
+/- 14
330
140
6
1.833
9%
+/- 12
200
105
8
1.25
6%
+/- 12
140
70
12
1.833
9%
+/- 24
200
52.5
16
1.25
6%
+/- 22
140
35
24
1.833
9%
+/-48
200
Data Sheet
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written consent of the copyright owner. The information furnished in this publication is subject to changes without notice.
16 of 32
ZSC31050
Advanced Differential Sensor Signal Conditioner
PGA Gain
aIN
Max. Span
VIN_SP
(mV/V)
Calculation
Factor k
Offset Shift
per Step
(% Full Span)
Approx. Maximum
Offset Shift
(mV/V)
Approx. Maximum Shift
(% VIN_SP)
(@ ± 20 Steps)
26.3
32
1.25
6%
+/- 45
140
14
50
3.0
15%
+/- 180
330
9.3
80
1.833
9%
+/- 160
200
7
100
1.25
6%
+/- 140
140
2.8
280
0.2
1%
+/- 60
22
Note: ZXZC can be adjusted in the range of –31 to 31; however, parameters are guaranteed only for -20 to 20.
2.3.3.
Measurement Cycle Performed by Multiplexer
Depending on EEPROM settings, the multiplexer selects the following inputs in a set sequence as shown in
Figure 2.2. Refer to the ZSC31050 Functional Description for EEPROM details.



Internal offset of the input channel (auto-zero)
measured by short circuiting the input
Bridge temperature signal measured by external
and internal diode (pn-junction)
Bridge temperature signal measured by bridge
resistors
Temperature measured by external thermistor
Pre-amplified bridge sensor signal
Figure 2.2.
Measurement Cycle ZSC31050
Start Routine
n
Bridge sensor measurement
1
Temp 1 auto-zero
The complete measurement cycle is controlled by the
CMC. The cycle diagram at the right shows its principle
structure.
n
Bridge sensor measurement
1
Temp 1 measurement
n
Bridge sensor measurement
The EEPROM adjustable parameters are
1
Bridge sensor auto-zero
n * T2E
Bridge sensor measurement
T2E
Temp 2 auto-zero
n * T2E
Bridge sensor measurement
T2E
Temp 2 measurement
n
Bridge sensor measurement
1
Common mode voltage




Measurement count n (bits 9:7 in configuration
word CFGCYC):
n =<1, 2, 4, 8, 16, 32, 64, 128>
Temperature 2 measurement enable, T2E=<0, 1>
After power-on, the start routine is called. It includes the
bridge sensor and auto-zero measurement. It also measures the main temperature channel and its auto-zero if
enabled.
i
g
.
4
:
Data Sheet
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17 of 32
M
e
a
s
u
r
ZSC31050
Advanced Differential Sensor Signal Conditioner
2.3.4.
Analog-to-Digital Converter
The ADC is a charge-balancing converter using full differential switched capacitor technique. It can be used as a
first or second order converter:
In the first order mode, the ADC is inherently monotone and insensitive against short and long term instability of
the clock frequency. The conversion cycle time depends on the desired resolution and can be roughly calculated
by equation (2):
t CYC _ 1  2 rADC s
(2)
The available ADC resolutions are rADC = <9, 10, 11, 12, 13, 14>.
In the second order mode, two conversions are stacked with the advantage of a much shorter conversion cycle
time but with the drawback of a lower noise immunity caused by the shorter signal integration period. The
conversion cycle time in this mode is roughly calculated by equation (3):
t CYC _ 2  2
 rADC  3 


2


s
(3)
The available ADC resolutions are rADC = <11, 12, 13, 14, 15>.
The result of the AD conversion is a relative counter result corresponding to equation (4):
 VADC_DIFF  VADC_OFF

Z ADC  2 rADC  
 1  RSADC 
VADC_REF


ZADC
Number of counts; i.e., the result of the conversion)
VADC_DIFF
Differential input voltage of ADC: (aIN * VIN_DIFF)
VADC_REF
Reference voltage of ADC: (VBR or VDDA)
VADC_OFF
Residual offset voltage of analog front-end to ADC
RSADC
Digital ADC range shift (RSADC = /2, /4, /8,
1
3
7
(4)
15
/16, controlled by EEPROM setting)
A sensor input signal can be shifted via the RSADC value into the optimal input range of the ADC.
The potential at the VBR pin is used as the ADC’s reference voltage VADC_REF in “VADC_REF = VBR” mode. The
mode is determined by the CFGAPP:ADCREF configuration register in EPPROM as described in the ZSC31050
Functional Description. Sensor bridges with no ratiometric behavior (e.g., temperature-compensated bridges) that
are supplied by a constant current, require the VDDA potential as VADC_REF and this can be adjusted in the
configuration. If this mode is enabled, XZC cannot be used (adjustment=0), but it must be enabled (refer to the
calculation spreadsheet ZSC31050_Bridge_Current_Excitation_Rev*.xls for details).
Note:
The AD conversion time (sample rate) is only part of the complete signal conditioning cycle.
Data Sheet
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ZSC31050
Advanced Differential Sensor Signal Conditioner
Table 2.3
ADC
Order
(OADC)
1
2
Output Resolution versus Sample Rate
Maximum Output Resolution
rADC
**
Sample Rate fCON
Digital OUT
Analog OUT
rPWM
fCLK=2MHz
fCLK =2.25MHz
(Bit)
(Bit)
(Bit)
(Bit)
(Hz)
(Hz)
9
9
9
9
1302
1465
10
10
10
10
781
879
11
11
11
11
434
488
12
12
11
12
230
259
13
13
11
12
115
129
14
14
11
12
59
67
10
10
10
10
3906
4395
11
11
11
11
3906
4395
12
12
11
12
3906
4395
13
13
11
12
1953
2197
14
14
11
12
1953
2197
15
15
11
12
977
1099
2.4. System Control
The system control is started by the internal power-on reset (POR) using the internal clock generator or an
external clock. It has the following features:
 Control of the I/O functions and the measurement cycle using the EEPROM-stored configuration settings.
 16-bit correction calculation for each measurement signal using the EEPROM-stored calibration coefficients
and ROM-based algorithms.
 Error checking: To increase safety, the EEPROM data are verified via an EEPROM signature during the
initialization procedure and the registers of the CMC are continuously observed with a parity check. If an
error is detected, the error flag of the CMC is set and the outputs are driven to a diagnostic value. See
section 2.7.
Note:
**
Conditioning options include up to third-order sensor input correction (de-rated). The available adjustment
ranges depend on the specific calibration parameters; basically, offset compensation and linear correction
are only limited by the loss of resolution the compensation will cause. The second-order correction is
possible up to approximately 20% of the full-scale difference from a straight line; third-order is possible up
to approximately 10% (ADC resolution = 13 bits). The temperature calibration includes first and second
order correction, which should be sufficient in almost all applications. ADC resolution also affects
calibration options – each additional bit of resolution reduces the calibration range by approximately 50%.
ADC resolution should be 1 to 2 bits higher than applied output resolution
Data Sheet
July 27, 2015
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19 of 32
ZSC31050
Advanced Differential Sensor Signal Conditioner
2.5. Output Stage
The ZSC31050 provides the following I/O pins: OUT, IO1, IO2 and SDA. The signal formats listed in Table 2.4
2
can be output via these pins: analog (voltage or current), PWM, data (SPI/I C™), alarm. The following values can
be provided at the I/O pins: bridge sensor signal, temperature signal 1, temperature signal 2, and alarms.
Note: The alarm signals (Alarm 1 and Alarm 2) only apply to the bridge sensor signal; they cannot be used as an
alarm for the temperature signal.
Because some pins are dual-purpose, there are restrictions on the possible combinations for outputs and
interface connections. Table 2.4 gives an overview of valid combinations. For some combinations in the SPI
Mode, pin assignments depend on whether the ZSC31050 is in the Command Mode (CM) or the Normal
Operation Mode (NOM) as indicated in the “Mode” column (refer to the ZSC31050 Functional Description for
more details).
Note: In the SPI Mode, the IO2 pin is used as the Slave Select, so no Alarm 2 can be output in this mode.
Table 2.4.
Output Configurations Overview
Configuration
Number
SIF
2
I C™
I/O Pins Used
SPI
OUT
IO1
1

2

3

4

ALARM1
5

PWM1
6

PWM1
7

Analog
8

Analog
9

Analog
10

Analog
ALARM1
11

Analog
PWM1
12

Analog
PWM1
13

PWM2
14

PWM2
15

PWM2
16

PWM2
ALARM1
17

PWM2
PWM1
18

PWM2
PWM1
Data Sheet
July 27, 2015
IO2
SDA
Mode
Data I/O
ALARM1
Data I/O
ALARM2
Data I/O
ALARM2
Data I/O
Data I/O
ALARM2
Data I/O
Data I/O
ALARM1
Data I/O
ALARM2
Data I/O
ALARM2
Data I/O
Data I/O
ALARM2
Data I/O
Data I/O
ALARM1
Data I/O
ALARM2
Data I/O
ALARM2
Data I/O
Data I/O
ALARM2
Data I/O
© 2015 Zentrum Mikroelektronik Dresden AG — Rev. 1.21
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written consent of the copyright owner. The information furnished in this publication is subject to changes without notice.
20 of 32
ZSC31050
Advanced Differential Sensor Signal Conditioner
Configuration
Number
SIF
2
I C™
I/O Pins Used
SPI
OUT

19

20

21

22
Analog

23
Analog

24
Analog

25
PWM2

26
PWM2

27
2.5.1.
PWM2
Mode
IO1
IO2
SDA
Data out
(SDO)
Slave select
Data in
Data out
(SDO)
Slave select
Data in
CM
ALARM1
-
-
NOM
Data out
Slave select
Data in
CM
PWM1
-
-
NOM
Data out
Slave select
Data in
Data out
Slave select
Data in
CM
ALARM1
-
-
NOM
Data out
Slave select
Data in
CM
PWM1
-
-
NOM
Data out
Slave select
Data in
Data out
Slave select
Data in
CM
ALARM1
-
-
NOM
Data out
Slave select
Data in
CM
PWM1
-
-
NOM
Analog Output
For the analog output, three 15-bit registers store the compensated measurement results for the bridge sensor
signal and temperature measurements 1 and 2. Each register can be independently switched to either the digitalto-analog converter module (DAC) or the PWM module (see Figure 2.1) and then output via the FIO1 or FIO2
output module connected to the OUT or IO1 pin respectively according to Table 2.5. Refer to the ZSC31050
Functional Description for details.
Table 2.5.
Analog Output Configuration
Output Module
OUT
Voltage (DAC)

PWM

Data Sheet
July 27, 2015
IO1

© 2015 Zentrum Mikroelektronik Dresden AG — Rev. 1.21
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written consent of the copyright owner. The information furnished in this publication is subject to changes without notice.
21 of 32
ZSC31050
Advanced Differential Sensor Signal Conditioner
The voltage output module consists of an 11-bit resistor string DAC with a buffered output and a subsequent
inverting amplifier with a class AB rail-to-rail operational amplifier. The two internal feedback networks are
connected to the FBN and FBP pins. This structure offers wide flexibility for the output configuration; for example,
voltage output and 4 mA to 20 mA current loop output. Accidentally short-circuiting the analog output to VSS or
VDDA does not damage the ZSC31050.
The PWM module outputs the analog measurement value via a stream of pulses with a duty cycle that is
determined by the analog value. The PWM frequency depends on the resolution and clock divider settings. The
maximum analog output resolution is 12 bits; however the maximum PWM frequency is 4 kHz (9 bits). If both
PWM2 and SPI protocol are activated (configuration numbers 25, 26, and 27 in Table 2.4), the output IO1 pin is
shared between the PWM output and the SPI SDO output of the serial interface, and SPI interface communication
(Command Mode) interrupts the PWM output.
2.5.2.
Comparator Module (ALARM Output)
The comparator module consists of two comparator channels that can be connected to IO1 and IO2. Each can be
independently programmed for threshold, hysteresis, switching direction, and on/off delay. A window comparator
mode is also available.
2.5.3.
Serial Digital Interface
The ZSC31050 includes a serial digital interface that is able to communicate in three different communication
2
protocols: I C™, SPI, and ZACwire™ (one-wire communication). In SPI mode, the IO2 pin operates as the slaveselect input, and the IO1 pin is the data output (SDO).
Initializing Communication
After power-on for approximately 20ms (the start window), the ZSC31050 interface is in the ZACwire™ mode,
which allows communication via the one-wire interface (the OUT pin).
If a proper communication request is detected during the start window, the interface stays in the ZACwire™ mode
(the Command Mode). This state can be left by set commands or a new power-on.
If no request is received during the start window, then the serial interface switches to communication via either
2
I C™ or SPI mode depending on EEPROM settings. The OUT pin can be used as an analog output or as a PWM
output depending on EEPROM settings. The start window can be disabled (or enabled) by a special EEPROM
setting.
For a detailed description of the serial interfaces, see the ZSC31050 Functional Description.
Data Sheet
July 27, 2015
© 2015 Zentrum Mikroelektronik Dresden AG — Rev. 1.21
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.
22 of 32
ZSC31050
Advanced Differential Sensor Signal Conditioner
2.6. Voltage Regulator
For 3V to 5V (±10%) ratiometric output applications, the external supply voltage can be used for sensor element
biasing. If an absolute analog output is required, then the internal voltage regulator with an external power
regulation element (JFET) can be used. The regulation is bandgap-reference-based and designed for an external
supply voltage VSUPP in the range of 7V to 40V DC. The internal supply and sensor bridge voltage can be varied
between 3V and 5.5V in four steps with the voltage regulator as determined by a configuration word in EEPROM.
2.7. Watchdog and Error Detection
The ZSC31050 detects various possible errors. A detected error is signaled by changing to a diagnostic mode. In
this case, the analog output is set to the high or low level (maximum or minimum possible output value)
depending on the error and the output registers of the digital serial interface are set to a correlated error code.
A watchdog continuously monitors the operation of the CMC and the progress of the measurement loop.
A continuous check of the sensor bridge for broken wires is done by two comparators monitoring the input voltage
of each input [(VSSA + 0.5V) to (VDDA – 0.5V)]. The common mode voltage of the sensor is continuously
monitored to detect sensor aging.
Different functions and blocks in the digital section are continuously monitored, including the RAM, ROM,
EEPROM, and register contents.
See section 1.3.4 in the ZSC31050 Functional Description for a detailed description of all monitored blocks and
methods of indicating errors.
Data Sheet
July 27, 2015
© 2015 Zentrum Mikroelektronik Dresden AG — Rev. 1.21
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.
23 of 32
ZSC31050
Advanced Differential Sensor Signal Conditioner
3
Application Circuit Examples
Figure 3.1
Application Example 1
Figure 3.2
Typical ratiometric measurement with voltage output,
temperature compensation via external diode, internal
VDD regulator, and active sensor connection check
(bridge must not be at VDDA)
Application Example 2
0V to 10V output configuration with supply regulator
(external JFET), temperature compensation via internal diode, and bridge in voltage mode
VDDA = 5V
+2.7V to +5.5V
+7V to +40V
VSUPP
VSUPP
C1
0.1µF
C2
0.1µF
VDD 8
SDA 7
C2
0.1µF
SDA
C3
0.1µF
11 FBP
12 IR_TEMP
13 VBR
14 VINP
ZSC31050
Serial Interface
15 VSS
SCL 6
VDD
8
SDA
7
SDA
11 FBP
SCL
6
SCL
IO2
5
IO1
IO1
4
IO2
SCL
IO2 5
IO2
IO1 4
IO1
Out: 0 to 10V
ZD
6.8V
Flexible I/Os
12 IR_TEMP
13 VBR
VGATE 3
14 VINP
IN3 2
16 VINN
9 FBN
10 OUT
ZSC31050
9 FBN
10 OUT
R3
390Ω
IN3 2
16 VINN
C2
< 15nF
Sensor Bridge
Out / OWI
C1
0.1µF
VGATE 3
15 VSS
VDDA 1
R1
2.2kΩ
R4
1kΩ
R2
2kΩ
VDDA 1
Sensor Bridge
GND
Figure 3.3
Application Example 3
GND
Figure 3.4
Absolute voltage output, supply regulator (external
JFET), constant current excitation of the sensor bridge,
temperature compensation by bridge voltage drop
measurement, internal VDD regulator without external
capacitor
VDDA = 5V
Application Example 4
Ratiometric bridge differential signal measurement,
3–wire connection for end-of-line calibration at OUT
pin (ZACwire™), additional temperature measurement with external thermistor, and PWM output at
IO1 pin
+7V to +40V
+2.7V to +5.5V
VSUPP
C2
0.1µF
RBR_REF
C1
0.1µF
C2
0.1µF
RT
9 FBN
VDD 8
10 OUT
SDA 7
SDA
11 FBP
SCL 6
SCL
IO2 5
IO1
12 IR_TEMP
IO1 4
IO2
9 FBN
VDD 8
10 OUT
SDA 7
SDA
11 FBP
SCL 6
SCL
VSUPP
C1
0.1µF
ZD
6.8V
13 VBR
14 VINP
15 VSS
16 VINN
Sensor Bridge
Data Sheet
July 27, 2015
Flexible I/Os
13 VBR
14 VINP
VGATE 3
PTC
IN3 2
15 VSS
16 VINN
VDDA 1
C2
< 15nF
ZSC31050
12 IR_TEMP
ZSC31050
Serial Interface
IO2 5
IO1 4
PWM OUT
VGATE 3
IN3 2
VDDA 1
Sensor Bridge
C2
< 15nF
Out / OWI
Out / OWI
GND
GND
© 2015 Zentrum Mikroelektronik Dresden AG — Rev. 1.21
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.
24 of 32
ZSC31050
Advanced Differential Sensor Signal Conditioner
Figure 3.5
Application Example 5
Two-wire 4 to 20 mA configuration (7 to 40 V), temperature compensation via internal diode
VDDA = 5V
+7V to +40V
VSUPP
ZD
7.5V
(Current Loop+)
C1
0.1µF
C2
0.1µF
9 FBN
VDD 8
10 OUT
SDA 7
SDA
11 FBP
SCL 6
SCL
IO2 5
IO2
IO1 4
IO1
C3
10nF
12 IR_TEMP
13 VBR
14 VINP
15 VSS
16 VINN
ZSC31050
Serial Interface
Flexible I/Os
VGATE 3
IN3 2
VDDA 1
C4
220pF
Re
RB
2.2kΩ
Sensor Bridge
150Ω
Rsens
50Ω
(Current Loop)
GND
Note: It is possible to combine or separate connectivity of different application examples. For VDD generation,
ZMDI recommends using the internal supply voltage regulator with an external capacitor. Refer the ZSC31050
Application Note—Current Loop for use of supply voltage regulation features (non-ratiometric mode) and current
loop output mode.
4
ESD/Latch-Up-Protection
All pins have an ESD protection of >2000V, except the VINN, VINP, and FBP pins, which have an ESD protection
>1200V. All pins have a latch-up protection of 100mA or +8V/ –4V (relative to VSS/VSSA). Refer to section 5 for
details and restrictions. ESD protection referenced to the Human Body Model is tested with devices in SSOP16
packages during product qualification. The ESD test follows the Human Body Model with 1.5kOhm/100pF based
on MIL 883, method 3015.7.
Data Sheet
July 27, 2015
© 2015 Zentrum Mikroelektronik Dresden AG — Rev. 1.21
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.
25 of 32
ZSC31050
Advanced Differential Sensor Signal Conditioner
5
Pin Configuration and Package
Table 5.1.
Pin Configuration
Pin
Name
1
VDDA
2
IN3
3
Description
Remarks
Latch-up Related Application Circuit
Restrictions and/or Remarks
Positive analog supply voltage
Supply
Resistive temperature sensor IN
and external clock IN
Analog IN
Freely accessible by application (vulnerable to
latch-up if specifications in section 4 are
exceeded)
VGATE
Gate voltage for external regulator
FET
Analog OUT
Only connection to external FET
4
IO1
SPI data out or ALARM1 or PWM1
Output
Digital IO
Freely accessible by application
5
IO2
SPI slave select or ALARM2
Digital IO
Freely accessible by application
6
SCL
I²C™ clock or SPI clock
Digital IN, pull-up
Freely accessible by application
7
SDA
Data I/O for I²C™ or data IN for SPI Digital I/O, pull-up
Freely accessible by application
8
VDD
Positive digital supply voltage
Supply
Only capacitor to VSS is allowed; otherwise no
application access
9
FBN
Negative feedback connection
output stage
Analog I/O
Freely accessible by application
10
OUT
Analog output or PWM2 output or
one-wire interface I/O
Analog OUT or
Digital I/O
Freely accessible by application
11
FBP
Positive feedback connection
output stage
Analog I/O
Freely accessible by application
12
IR_TEMP
Current source resistor I/O and
temperature diode in
Analog I/O
Circuitry secures potential is within VSS-VDDA
range; otherwise no application access
13
VBR
Bridge top sensing in bridge
current out
Analog I/O
Only short to VDDA or connection to sensor
bridge; otherwise no application access
14
VINP
Positive input from sensor bridge
Analog IN
Freely accessible by application
15
VSS
Negative supply voltage
Ground
16
VINN
Negative input from sensor bridge
Analog IN
Data Sheet
July 27, 2015
Freely accessible by application
© 2015 Zentrum Mikroelektronik Dresden AG — Rev. 1.21
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written consent of the copyright owner. The information furnished in this publication is subject to changes without notice.
26 of 32
ZSC31050
Advanced Differential Sensor Signal Conditioner
The standard package for the ZSC31050 is a SSOP16 (5.3mm body width) with lead-pitch 0.65mm:
Figure 5.1.
Pin Configuration
Pin Name
FBN
OUT
FBP
IR_TEMP
VBR
VINP
VSS
VINN
6
Pin-Name
9
10
11
12
13
14
15
16
8
7
6
5
4
3
2
1
VDD
SDA
SCL
IO2
IO1
VGATE
IN3
VDDA
Reliability
The ZSC31050 is qualified according to the AEC-Q100 standard, operating temperature grade 0. A fit rate < 5fit
(temp=55°C, S=60%) is guaranteed. A typical fit rate of the C7A technology that is used for the ZSC31050 is
2.5fit.
7
Customization
For high-volume applications that require an upgraded or downgraded functionality compared to the ZSC31050,
ZMDI can customize the circuit design by adding or removing certain functional blocks.
ZMDI has a considerable library of sensor-dedicated circuitry blocks that enable ZMDI to provide a custom
solution quickly. Please contact ZMDI for further information.
Data Sheet
July 27, 2015
© 2015 Zentrum Mikroelektronik Dresden AG — Rev. 1.21
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.
27 of 32
ZSC31050
Advanced Differential Sensor Signal Conditioner
8
Ordering Information
Product Code
Description
Package
ZSC31050FEB
ZSC31050 Die — Temperature range: -40°C to +150°C
Unsawn on Wafer
ZSC31050FEC
ZSC31050 Die — Temperature range: -40°C to +150°C
Sawn on Wafer Frame
ZSC31050FEG1
ZSC31050 SSOP-16 — Temperature range: -40°C to +150°C
Tube: add “-T” to sales code
Reel: add “-R”
ZSC31050FAB
ZSC31050 Die — Temperature range: -40°C to +125°C
Unsawn on Wafer
ZSC31050FAC
ZSC31050 Die — Temperature range: -40°C to +125°C
Sawn on Wafer Frame
ZSC31050FAG1
ZSC31050 SSOP-16 — Temperature range: -40°C to +125°C
Tube: add “-T” to sales code
Reel: add “-R”
ZSC31050FIB
ZSC31050 Die — Temperature range: -25°C to +85°C
Unsawn on Wafer
ZSC31050FIC
ZSC31050 Die — Temperature range: -25°C to +85°C
Sawn on Wafer Frame
ZSC31050FIG1
ZSC31050 SSOP-16 — Temperature range: -25°C to +85°C
Tube: add “-T” to sales code
Reel: add “-R”
ZSC31050KIT Evaluation ZSC31050 SSC Evaluation Kit: 3 interconnecting boards, 5
Kit V3.1
ZSC31050 SSOP-16 samples, USB cable
(Software can be downloaded from www.zmdi.com/zsc31050)
Kit
ZSC31050 Mass
Calibration System V1.1
Kit
Data Sheet
July 27, 2015
Modular Mass Calibration System (MSC) for ZSC31050: MCS
boards, cable, connectors
(Software can be downloaded from www.zmdi.com/zsc31050)
© 2015 Zentrum Mikroelektronik Dresden AG — Rev. 1.21
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.
28 of 32
ZSC31050
Advanced Differential Sensor Signal Conditioner
9
Related Documents
Note: Rev_X_xy refers to the current revision number.
Document
File Name
ZSC31050 Feature Sheet
ZSC31050_Feature_Sheet_Rev_X_xy.pdf
ZSC31050 Functional Description
ZSC31050_FunctionalDescription_Rev_X_xy.pdf
ZSC31050 Evaluation Kit Description
ZSC31050_Evaluation_Kit_Description_Rev_X_xy.pdf
ZSC31050 Application Note—0-10V Output
ZSC31050_AN_0-10V_Output_Rev_X_xy.pdf
ZSC31050 Application Note—Current Loop *
ZSC31050_AN_Current_Loop_Rev_X_xy.pdf
ZSC31050 Bridge Current Excitation Spreadsheet
ZSC31050_Bridge_Current_Excitation_Rev_X_xy.xls
ZSC31050 Application Note - External Protection Circuitry
ZSC31010/31015/31050 AN - External Protection Circuitry
Rev_X_xy.pdf
ZSC31050 Bandwidth Calculation Spread Sheet
ZSC31050_BandwidthCalculation_Rev_X_xy.xls
SSC Temperature Profile Calculation Spreadsheet *
SSC_Temperature_Profile_Calculation_Rev_X_xy.xlsx
Visit the ZSC31050 product page (www.zmdi.com/zsc31050) on ZMDI’s website www.zmdi.com or contact your
nearest sales office for the latest version of these documents.
* Documents marked with an asterisk (*) require a login account for access on the web. For detailed instructions, visit
www.zmdi.com/login-account-setup-procedure.
Data Sheet
July 27, 2015
© 2015 Zentrum Mikroelektronik Dresden AG — Rev. 1.21
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.
29 of 32
ZSC31050
Advanced Differential Sensor Signal Conditioner
10 Glossary
Term
Description
ADC
Analog-to-Digital Converter
AFE
Analog Front-End
CMC
Calibration Microcontroller
CMOS
Complementary Metal Oxide Semiconductor
DNL
Differential Nonlinearity
ESD
Electrostatic Device
FIO
Flexible Input/Output
FSO
Full Scale Output
IC
Integrated Circuit
INL
Integral Nonlinearity
MUX
Multiplexer
PGA
Programmable Gain Amplifier
POC
Power On Control
PWM
Pulse Width Modulation
PTC
Positive Temperature Coefficient
SIF
Serial Interface
T2E
Temperature 2 Measurement
TS
Temperature Sensor
XZC
Extended Zero-Point Compensation
Data Sheet
© 2015 Zentrum Mikroelektronik Dresden AG — Rev. 1.21
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.
July 27, 2015
30 of 32
ZSC31050
Advanced Differential Sensor Signal Conditioner
11 Document Revision History
Revision
Date
Description
1.00
-
First release of document.
1.01-1.02
-
Headlines and footnotes at all pages updated.
Input capacitance of digital interface pins added in 5.5.1.7.
1.03
-
Note 4 “Default Configuration” added in 5.4.
Overall accuracy / values and conditions for current loop output added in 5.4.7.3.
Reliability / fit rate values added in section 6.
1.04
September 2009
Reformatted with new ZMDI template.
October 2009
Update to “Related Documents” and “Document Revision History.”
Update of company references for ZMDI.
New format for revision numbering in footer.
November 30, 2009
Reformatted for new ZMDI template.
Addition of “ZSC31050 Feature Sheet” section on pages 2 and 3.
Addition of ordering codes for ZSC31050 and Evaluation Kits.
1.08-1.09
February 16, 2010
Addition of units for 1.4.1.2 and change in symbol for 1.5.2.1.
Addition of new design for block diagram and all application schematics.
Update for glossary. Addition of CM/nom information’s in Table 2.4.
Update for phone number for ZMD Far East, Ltd.
Update for ordering codes description.
Minor edits.
1.10
February 18, 2010
Changed CD to DVD in ordering code.
Removed die/package option “F.”
Minor edits.
1.11
July 29, 2010
Changed “Application Circuit Examples” in Figure 3.1 and Figure 3.5.
Addition of current consumption in feature sheet area.
New style for equation in section 2.3.2 and 2.3.4.
Correction of calculation formula for ZADC in section 2.3.4.
Minor edits to RSADC formula in section 2.3.4.
Update of product name from ZMD31050 to ZSC31050.
1.12
July 7, 2013
Addition of RB and C4 in to the current loop application circuit (Figure 3.5).
Changed absolute maximum ratings for I²C™ interface.
Updated ZMDI contact information and imagery for cover and headers.
Correction of equation (4).
Removal of ZSC31050FCxx part numbers.
Minor edits.
1.05-1.06
1.07
Data Sheet
July 27, 2015
© 2015 Zentrum Mikroelektronik Dresden AG — Rev. 1.21
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.
31 of 32
ZSC31050
Advanced Differential Sensor Signal Conditioner
Revision
1.13
Date
October 14, 2013
Description
Specification 1.2.4 for data retention for EEPROM changed to minimum 15 years.
Specification 1.3.4 added for ADC input range.
Added note to section 1.3.1 that first-order configuration of the ADC cannot be used
with 15-bit resolution.
Specification 1.4.7.3 updated to remove condition of current-loop output, etc.
Minor edits for clarity.
1.14
December 11, 2013
Update for part ordering tables: Mass Calibration Kit no longer includes DVD of
software. Software is now downloaded from www.zmdi.com/zsc31050 to ensure
user has the latest version of the software.
1.15
April 7, 2014
Related documents updated.
1.20
May 11, 2014
Product has passed AEC-Q100 at temperature grade 0 (-40C to 150C). Related
updates to page 2 and section 6.
Update for contact information.
1.21
July 27, 2015
Update for order codes for ZSC31050 SSC Evaluation Kit.
Update for contact information.
Sales and Further Information
www.zmdi.com
[email protected]
Zentrum Mikroelektronik
Dresden AG
Global Headquarters
Grenzstrasse 28
01109 Dresden, Germany
ZMD America, Inc.
1525 McCarthy Blvd., #212
Milpitas, CA 95035-7453
USA
Central Office:
Phone +49.351.8822.306
Fax
+49.351.8822.337
USA Phone 1.855.275.9634
Phone +1.408.883.6310
Fax
+1.408.883.6358
European Technical Support
Phone +49.351.8822.7.772
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,
licensee, or any other third party for any special, indirect, incidental, or consequential damages of any kind or nature whatsoever arising out of or
in any way related to the furnishing, performance, or use of this technical data. ZMD AG hereby expressly disclaims any liability of ZMD AG to any
customer, licensee or any other third party, and any such customer, licensee and any other third party hereby waives any liability of ZMD AG for
any damages in connection with or arising out of the furnishing, performance or use of this technical data, whether based on contract, warranty,
tort (including negligence), strict liability, or otherwise.
European Sales (Stuttgart)
Phone +49.711.674517.55
Fax
+49.711.674517.87955
Data Sheet
July 27, 2015
Zentrum Mikroelektronik
Dresden AG, Japan Office
2nd Floor, Shinbashi Tokyu Bldg.
4-21-3, Shinbashi, Minato-ku
Tokyo, 105-0004
Japan
ZMD FAR EAST, Ltd.
3F, No. 51, Sec. 2,
Keelung Road
11052 Taipei
Taiwan
Phone +81.3.6895.7410
Fax
+81.3.6895.7301
Phone +886.2.2377.8189
Fax
+886.2.2377.8199
Zentrum Mikroelektronik
Dresden AG, Korea Office
U-space 1 Building
Unit B, 906-1
660, Daewangpangyo-ro
Bundang-gu, Seongnam-si
Gyeonggi-do, 463-400
Korea
Phone +82.31.950.7679
Fax
+82.504.841.3026
© 2015 Zentrum Mikroelektronik Dresden AG — Rev. 1.21
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.
32 of 32