ZMD31150
Fast Automotive Sensor Signal Conditioner
Data Sheet
Rev. 1.04 / November 2009
Data Sheet
Fast Automotive Sensor Signal Conditioner
ZMD31150
Brief Description
The ZMD31150 is a CMOS integrated circuit for
highly-accurate amplification and sensor-specific
correction of bridge sensor signals. Digital
compensation of sensor offset, sensitivity,
temperature
drift,
and
non-linearity
is
accomplished via a 16-bit RISC microcontroller
running a correction algorithm, with calibration
coefficients stored in an EEPROM.
The ZMD31150 is adjustable to nearly all bridge
sensor types. Measured values are provided at
the analog voltage output or at the digital
ZACwire
TM
and I
2
C interface. The digital interface
can be used for a simple PC-controlled calibration
procedure, in order to program a set of calibration
coefficients into an on-chip EEPROM. Thus, a
specific sensor and a ZMD31150 are mated
digitally: fast, precise, and without the cost
overhead associated with trimming by external
devices or a laser.
Benefits
No external trimming components
required
Only a few external protection devices
needed
PC-controlled configuration and One-
Shot calibration via I
2
C or ZACwire
TM
interface: Simple, cost efficient, quick,
and precise
ZACwire
TM
interface
End-of-Line calibration via I
2
C or
High accuracy (0.25% FSO @ -25 to
85° C; 0.5% FSO @ -40 to 125° C)
The ZMD31150 is optimized for
D31150
automotive environments by its special
protection circuitry and excellent
electromagnetic compatibility
Features
Digital compensation of sensor offset,
sensitivity, temperature drift, and non-
linearity
Adjustable to nearly all bridge sensor types,
analog gain of 420, overall gain up to 2000
Output options: ratiometric analog voltage
output (5 - 95% in maximum, 12.4 bit
resolution) or ZACwire
TM
(digital one-wire-
interface)
Temperature compensation: internal or
external diode, bridge resistance, thermistor
Sensor biasing by voltage or constant
current
Sample rate up to 7.8 kHz
High voltage protection up to 33 V
Reverse polarity and short circuit protection
Wide operation temperature -40 to +150 °C
Supply voltage 4.5 to 5.5 V
Traceability by user-defined EEPROM
entries
Several safety and diagnostic functions
Available Support
Evaluation Kit
Application Notes
Mass calibration solution
ZMD31150 Overview
VCC
Sensor
Module
ZMD
31150
OUT
GND
Data Sheet
Rev. 1.04
November 2009
© 2009 ZMD AG Rev. 1.04
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 / 23
Data Sheet
Fast Automotive Sensor Signal Conditioner
ZMD31150
Contents
Electrical Characteristics ............................................................................................................................ 5
1.1. Absolute Maximum Ratings ................................................................................................................ 5
1.2. Operating Conditions .......................................................................................................................... 5
1.3. Electrical Parameters .......................................................................................................................... 6
1.3.1. Supply Current and System Operation Conditions ...................................................................... 6
1.3.2. Analog Front-End (AFE) Characteristics ..................................................................................... 6
1.3.3. Temperature Measurement (refer chapter 0) .............................................................................. 6
1.3.4. Sensor Connection Check ........................................................................................................... 7
1.3.5. AD-Conversion............................................................................................................................. 7
1.3.6. DAC & Analog Output (Pin AOUT) ............................................................................................. 7
1.3.7. System Response........................................................................................................................ 8
1.4. Interface Characteristics & EEPROM ................................................................................................. 8
1.4.1. I
2
C Interface (refer ZMD31150_FD_Rev_*.pdf for timing details) ............................................... 8
1.4.2. ZACwire™ One Wire Interface (OWI).......................................................................................... 9
1.4.3. EEPROM...................................................................................................................................... 9
2 Circuit Description .................................................................................................................................... 10
2.1. Signal Flow........................................................................................................................................ 10
2.2. Application Modes............................................................................................................................. 10
2.3. Analog Front End (AFE).................................................................................................................... 11
2.3.1. Programmable Gain Amplifier (PGA)......................................................................................... 11
2.3.2. Measurement Cycle ................................................................................................................... 12
2.3.3. Analog-to-Digital Converter........................................................................................................ 13
2.4. Temperature Measurement............................................................................................................... 14
2.5. System Control and Conditioning Calculation................................................................................... 15
2.5.1. Operation Modes ....................................................................................................................... 15
2.5.2. Start Up Phase........................................................................................................................... 15
2.5.3. Conditioning Calculation ............................................................................................................ 16
2.6. Analog Output AOUT ........................................................................................................................ 16
2.7. Serial Digital Interface ....................................................................................................................... 16
2.8. Failsafe Features, Watchdog and Error Detection............................................................................ 17
2.9. High Voltage, Reverse Polarity and Short Circuit Protection............................................................ 17
3 Application Circuit Examples.................................................................................................................... 18
4 Pin Configuration, Latch-Up and ESD Protection .................................................................................... 20
4.1. Pin Configuration and Latch-up Conditions ...................................................................................... 20
4.2. ESD-Protection.................................................................................................................................. 20
5 Package.................................................................................................................................................... 21
6 Quality and Reliability............................................................................................................................... 21
7 Customization........................................................................................................................................... 21
8 Additional Documents .............................................................................................................................. 22
9 Glossary ................................................................................................................................................... 22
10
Document Revision History .................................................................................................................. 23
1
Data Sheet
Rev. 1.04
November 2009
© 2009 ZMD AG Rev. 1.04
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 / 23
Data Sheet
Fast Automotive Sensor Signal Conditioner
ZMD31150
List of Figures
Figure 2.1
Figure 2.2
Figure 3.1
Figure 3.2
Figure 3.3
Figure 5.1
Block Diagram of the ZMD31150................................................................................................10
Measurement Cycle ....................................................................................................................13
Bridge in Voltage Mode, External Diode Temperature Sensor...................................................18
Bridge in Voltage Mode, External Thermistor .............................................................................19
Bridge in Current Mode, Temperature Measurement via Bridge TC ..........................................19
ZMD31150 Pin Diagram..............................................................................................................21
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 1.8
Table 1.9
Table 1.10
Table 1.11
Table 1.12
Table 2.1
Table 2.2
Table 2.3
Table 3.1
Table 4.1
Table 8.1
Absolute Maximum Ratings ..........................................................................................................5
Operating Conditions ....................................................................................................................5
Parameters for Supply Current and System Operation Conditions ..............................................6
Parameters for AFE ......................................................................................................................6
Parameters for Temperature Measurement..................................................................................6
Parameters for Sensor Connection Check ...................................................................................7
Parameters for AD-Conversion.....................................................................................................7
Parameters for DAC & Analog Output ..........................................................................................7
Parameters for System Response ................................................................................................8
Parameters for I
2
C Interface .........................................................................................................8
Parameters for ZACwire
TM
............................................................................................................9
Parameters for EEPROM..............................................................................................................9
Adjustable gains, resulting sensor signal spans, and common mode ranges ............................11
Analog Zero Point Shift Ranges (XZC) .......................................................................................12
Analog Output resolution versus sample rat ...............................................................................14
Application Circuit Parameters....................................................................................................18
Pin Configuration and Latch-Up Conditions................................................................................20
Additional Documents .................................................................................................................22
Data Sheet
Rev. 1.04
November 2009
© 2009 ZMD AG Rev. 1.04
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 / 23
Data Sheet
Fast Automotive Sensor Signal Conditioner
ZMD31150
1
1.1.
Electrical Characteristics
Absolute Maximum Ratings
Absolute Maximum Ratings
Parameter
Supply Voltage
1
Potential at pin AOUT
1
Analog Supply Voltage
1
Parameters apply in operation temperature range and without time limitations.
Table 1.1
Symbol
V
DDE_AMR
V
OUT
V
DDA_AMR
V
A_IO
V
D_IO
T
STG
Min
-33
-33
-0.3
-0.3
-55
Max
33
33
6.5
V
DDA
+ 0.3
150
Unit
V
DC
V
DC
V
DC
V
DC
C
Conditions
To V
SSE
, refer to chapter 3 for application
circuits
Related to V
SSE
Related to V
SSA
, V
DDE
- V
DDA
< 0.35 V
Related to V
SSA
Voltage at all analog and
digital IO – Pins
Storage temperature
1.2.
Operating Conditions
Operating Conditions
Parameter
Ambient temperature
2
All voltages are related to V
SSA
.
Table 1.2
Symbol
T
AMB
T
AMB_TQA
T
AMB_TQI
V
DDE
R
BR_V
R
BR_C
R
IBR
I
BR_MAX
V
BR_TOP
TC R
IBR
Min
-40
-40
-25
4.5
3, 4
3, 4
Typ
Max
150
125
85
Unit
C
C
C
V
DC
k
k
k
Conditions
TQE
TQA
TQI
Ambient temperature
advanced performance
4
Ambient temperature
advanced performance
4
Supply Voltage
Bridge Resistance
Bridge Resistance
Resistor R
IBR
4
5.0
5.5
25
10
2
Bridge Voltage Mode
Bridge Current Excitation,
note I
BR_MAX
I
BR
= V
DDA
/ (16 * R
IBR
)
0.07 * R
BR
2
15/16 *
V
DDA
- 0.3
50
Maximum Bridge Current
Maximum Bridge Top
Voltage
TC Current Reference
Resistor
4
mA
V
ppm/K Behavior influences generated
current
1
2
Refer to the 'ZMD31150 High Voltage Protection Description' for specification and detailed conditions
Notice temperature profile description in the 'ZMD31150 Dice Package Document' for operation in temperature range > 125 °C
3
Symmetric behavior and identical electrical properties (especially with regard to the low pass characteristic) of both sensor inputs of
the ZMD31150 are required. Unsymmetrical conditions of the sensor and/or external components connected to the sensor input pins
of ZMD31150 can generate a failure in signal operation
4
No measurement in mass production, parameter is guaranteed by design and/or quality observation
Data Sheet
Rev. 1.04
November 2009
© 2009 ZMD AG Rev. 1.04
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 / 23
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