ZMD31050
Advanced Differential Sensor Signal Conditioner
Data Sheet
Rev. 1.06 / October 2009
Data Sheet
Advanced Differential Sensor Signal Conditioner
ZMD31050
Brief Description
ZMD31050 is a CMOS integrated circuit for
highly-accurate amplification and sensor-specific
correction of bridge sensor signals. The device
provides digital compensation of sensor offset,
sensitivity, temperature drift and non-linearity by a
16-bit RISC micro controller running a correction
algorithm with correction coefficients stored in
non-volatile EEPROM.
The ZMD31050 accommodates virtually any
bridge sensor (e.g. piezo-resistive, ceramic-thick
film or steel membrane based). In addition, the IC
can interface a separate temperature sensor.
The bi-directional digital interfaces (I
2
C, SPI,
ZACwire
TM
) can be used for a simple PC-
controlled one-shot calibration procedure, in order
to program a set of calibration coefficients into an
on-chip EEPROM. Thus a specific sensor and a
ZMD31050 are mated digitally: fast, precise and
without the cost overhead associated with laser
trimming, or mechanical potentiometer methods.
Digital compensation of sensor offset,
sensitivity, temperature drift and non-
linearity
Accommodates nearly all bridge sensor
types (signal spans from 1 up to 275mV/V
processable)
Digital one-shot calibration: quick and
precise
Selectable compensation temperature T1
source: bridge, thermistor, internal diode
or external diode
Output options: voltage (0V to 5V),
2
current (4mA to 20mA), PWM, I C, SPI,
ZACwire
TM
(one-wire-interface), alarm
Adjustable output resolution (up to 15 bits)
versus sampling rate (up to 3.9kHz)
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)
Operation temperature -40 to +125°C (-40
to +150°C derated, depending on product
version)
Supply voltage +2.7V to +5.5V
Available in SSOP16 or as die
Benefits
No external trimming components
required
PC-controlled configuration and
calibration via digital bus interface -
simple, low cost
85°C; ±0.25% FSO @ -40°C to 125°C)
ZMD31050 Overview
High accuracy (±0.1% FSO @ -25°C to
Available Support
Application kit (SSOP16 samples,
calibration PCB, calibration software,
technical documentation)
Support for industrial mass calibration
Quick circuit customization for large
production volumes
Features
Data Sheet
Rev. 1.06
October 2009
© 2009 ZMD AG Rev. 1.06
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
Advanced Differential Sensor Signal Conditioner
ZMD31050
Contents
1
Electrical Characteristics ............................................................................................................................ 5
1.1. Absolute Maximum Ratings ................................................................................................................ 5
1.2. Operating Conditions
(Voltages related to VSS)............................................................................ 5
1.3. Build In Characteristics ....................................................................................................................... 6
1.4. Electrical Parameters
4
(Voltages related to VSS).......................................................................... 8
1.4.1. Supply / Regulation...................................................................................................................... 8
1.4.2. Analog Front End ......................................................................................................................... 8
1.4.3. DAC & Analog Output (Pin OUT)................................................................................................ 8
1.4.4. PWM Output (Pin OUT, IO1) ....................................................................................................... 8
1.4.5. Temperature Sensors (Pin IR_TEMP)......................................................................................... 8
1.4.6. Digital Outputs (IO1, IO2, OUT in digital mode) .......................................................................... 8
1.4.7. System Response........................................................................................................................ 9
1.5. Interface Characteristics ..................................................................................................................... 9
1.5.1. Multiport Serial Interfaces (I
2
C, SPI) ............................................................................................ 9
1.5.2. One Wire Serial Interface (ZACwire™)........................................................................................ 9
Circuit Description .................................................................................................................................... 10
2.1. Signal Flow........................................................................................................................................ 10
2.2. Application Modes............................................................................................................................. 11
2.3. Analog Front End (AFE).................................................................................................................... 12
2.3.1. Programmable Gain Amplifier (PGA)......................................................................................... 12
2.3.2. Extended Zero Point Compensation (XZC) ............................................................................... 12
2.3.3. Measurement Cycle realized by Multiplexer .............................................................................. 13
2.3.4. Analog-to-Digital Converter........................................................................................................ 14
2.4. System Control.................................................................................................................................. 15
2.5. Output Stage ..................................................................................................................................... 16
2.5.1. Analog Output ............................................................................................................................ 17
2.5.2. Comparator Module (ALARM Output) ....................................................................................... 17
2.5.3. Serial Digital Interface................................................................................................................ 17
2.6. Voltage Regulator ............................................................................................................................. 18
2.7. Watchdog and Error Detection.......................................................................................................... 18
Application Circuit Examples.................................................................................................................... 19
ESD/Latch-Up-Protection ......................................................................................................................... 21
Pin Configuration and Package................................................................................................................ 21
Reliability .................................................................................................................................................. 22
Customization........................................................................................................................................... 22
Related Documents.................................................................................................................................. 22
Document Revision History ...................................................................................................................... 23
2
3
4
5
6
7
8
9
Data Sheet
Rev. 1.06
October 2009
© 2009 ZMD AG Rev. 1.06
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
Advanced Differential Sensor Signal Conditioner
ZMD31050
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 ZMD31050................................................................................................10
Measurement cycle ZMD31050 ..................................................................................................13
Example 1 ...................................................................................................................................19
Example 2 ...................................................................................................................................19
Example 3 ...................................................................................................................................19
Example 4 ...................................................................................................................................19
Example 5 ...................................................................................................................................20
Pin Configuration.........................................................................................................................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 2.1
Table 2.2
Table 2.3
Table 2.4.
Table 2.5.
Table 5.1.
Absolute Maximum Ratings ..........................................................................................................5
Operating Conditions ....................................................................................................................5
Build In Characteristics .................................................................................................................6
Cycle Rate versus A/D-Resolution................................................................................................7
PWM Frequency ...........................................................................................................................7
Electrical Parameters ....................................................................................................................8
Interface Characteristics ...............................................................................................................9
Adjustable gains, resulting sensor signal spans, and common mode ranges ............................12
Extended Zero Point Compensation Range ...............................................................................13
Output Resolution versus Sample Rate......................................................................................14
Output configurations overview...................................................................................................16
Analog output configuration ........................................................................................................17
Pin Configuration.........................................................................................................................21
Data Sheet
Rev. 1.06
October 2009
© 2009 ZMD AG Rev. 1.06
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
Advanced Differential Sensor Signal Conditioner
ZMD31050
1
1.1.
No.
1.1.1
1.1.2
1.1.3
1.1.4
1.1.5
Electrical Characteristics
Absolute Maximum Ratings
Absolute Maximum Ratings
Parameter
Digital Supply Voltage
Analog Supply Voltage
Voltage at all analog and
digital I/O – Pins
Voltage at Pin FBP
Storage temperature
Symbol
VDD
AMR
VDDA
AMR
V
A_I/O
,
V
D_I/O
V
FBP_AMR
T
STG
1
Table 1.1
min
-0.3
-0.3
-0.3
-1.2
-45
typ
max
6.5
6.5
VDDA
+0.3
VDDA
+0.3
150
Unit
V DC
V DC
V DC
V DC
C
Conditions
To VSS
To VSS
Exception see 1.1.4
4 mA to 20mA – Interface
1.2.
No.
1.2.1
1.2.2.1
1.2.2.2
1.2.3
1.2.4
1.2.5
1.2.6
1.2.7
1.2.8
1.2.9
1.2.10
1.2.11
1.2.12
Operating Conditions
Parameter
Ambient temperature
advanced performance
Ambient temperature
Automotive range
Ambient temperature
Extended automotive range
Ambient temperature
EEPROM programming
EEPROM programming
cycles
Data retention (EEPROM)
Analog Supply Voltage
Analog Supply Voltage
advanced performance
Digital Supply Voltage
External Supply
Voltage
Common mode input range
Input Voltage Pin FBP
Sensor Bridge Resistance
(Voltages related to VSS)
Symbol
min
-25
-40
-40
-25
typ
max
85
125
150
85
100
15
a
V DC
V DC
VDDA
V DC
V DC
VADC_
REF
V DC
k
k
Full temperature range
CurrentLoop-IF 4 to
20mA
Averaged
temp < 85C
Ratiometric mode
Ratiometric mode
External powered
Voltage regulator mode
with ext. JFET
Depends on gain adjust,
refer chapter 2.3.1.
Unit
C
C
C
C
Operation life time <
1000h @ 125 to 150C
Conditions
TQI = -25 to 85C
TQC = 0 to 70C
Table 1.2
Operating Conditions
T
ADV
T
AMB_TQA
T
AMB_TQE
T
AMB_EEP
VDDA
VDDA
ADV
VDD
V
SUPP
V
IN_CM
V
IN_FBP
R
BR
R
BR_CL
2.7
4.5
-
2.7
VDDA
+ 2V
0.21
-1
3.0
5.0
1
5.5
5.5
1.05
-
2
0.76
VDDA
25.0
25.0
1
2
Default configuration: 2 order AD-conversion, 13Bit Resolution, gain >=210, fclk<=2.25MHz
Maximum depending on breakdown voltage of external JFET, notice application hints in related application note.
Data Sheet
Rev. 1.06
October 2009
© 2009 ZMD AG Rev. 1.06
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.
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