MLX90326 Datasheet DownloadLink 5366

MLX90326
Analog 0-5V Sensor Interface IC
Features and Benefits
Application Examples
Analog 0-5V ratiometric output
Single pin programming (through output)
Fast response time
Extended temperature range
Cost effective “electronic trimming”
Second order compensation of offset and gain
Internal temperature sensor provided
Pressure transducers, strain gauges,
accelerometers, position sensors, etc…
Industrial sensors
Automotive after market sensors
All resistive bridge sensors
Ordering Information
Part No.
MLX90326LFR
1 Functional Diagram
Temperature Code
L (-40°C to 150°C)
Package Code
FR (SSOP 209 mil)
2 General Description
The MLX90326 covers the most typical resistive
type of Wheatstone bridge applications for use in
an industrial or automotive after market
environment. It is a monolithic silicon analog
integrated sensor interface that converts small
changes in resistors, configured in a full
Wheatstone bridge on a sensing element, to large
output voltage variations.
The signal conditioning includes gain adjustment,
offset control and second order temperature
compensation in order to accommodate variations
of the different resistive sensing elements.
Compensation values are stored in EEPROM and
can be reprogrammed with an interface circuit and
a provided software.
The MLX90326 is programmed with a single wire
serial interface through the output pin.
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Data Sheet
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MLX90326
Analog 0-5V Sensor Interface IC
Table of Contents
1 Functional Diagram........................................................................................................... 1
2 General Description .......................................................................................................... 1
3 Absolute Maximum Ratings .............................................................................................. 3
4 Pin Definitions and Descriptions ....................................................................................... 4
5 General Electrical Specifications....................................................................................... 5
6 General Description .......................................................................................................... 7
7 Unique Features ............................................................................................................... 7
8 Application Information ..................................................................................................... 8
8.1 Ratio-metric mode with external temperature sensor.................................................. 8
8.2 Ratio-metric mode with no external temperature sensor............................................. 9
8.3 Non Ratio-metric mode with external temperature sensor. ......................................... 9
8.4 Non Ratio-metric mode with no external temperature sensor. .................................. 10
9 Standard information regarding manufacturability of Melexis products with different
soldering processes ........................................................................................................... 11
10 ESD Precautions........................................................................................................... 11
11 Package Information ..................................................................................................... 12
12 Disclaimer ..................................................................................................................... 13
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MLX90326
Analog 0-5V Sensor Interface IC
3 Absolute Maximum Ratings
Parameter.
Supply Voltage, VDD- VSS
Min
Max
Units
4.5
5.5
V
Operating Temperature Range, Tenvironment
-40
150
ºC
Storage Temperature Range
-50
150
°C
Programming Temperature Range
-40
125
°C
130
°C/W
Package Thermal Resistance
ESD Sensitivity
2
kV
Comments
Operating within specifications
HBM.
CDF - AEC - Q100-002
Table 1: Absolute maximum ratings
Exceeding the absolute maximum ratings may cause permanent damage. Exposure to absolute-maximumrated conditions for extended periods may affect device reliability.
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MLX90326
Analog 0-5V Sensor Interface IC
4 Pin Definitions and Descriptions
Package
Pin
Nr
1
Short
Name
INM
IN
2
ANAGND
gnd
3
INP
IN
4
SUB
gnd
5
TMP
IN
6
DIGGND
gnd
Digital Ground
7
Test
NC
On module to ground.
8
TESTOU
T
OUT
Test
Test Output.
On module to ground
9
TESTIN1
IN
Test
Test Input 1: CLKEXT, TEST (3 level)
10
TESTIN2
IN
Test
Test Input 2: DATAIN, SCAN (3 level)
11
FLT
OUT
Analog
Filter pin
12
OUT
BI
Analog
Analog output and communication pin
13
Test
NC
14
VDD
power
Dir
Type
Analog
Function / Description
Bridge Sensor Negative
Analog Ground
Analog
Bridge Sensor Positive
Substrate Ground
Temp
External Temperature Sensor (Resistor to supply)
On module to ground
Supply
Supply
Table 2: Pin definitions and descriptions
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MLX90326
Analog 0-5V Sensor Interface IC
5 General Electrical Specifications
o
o
DC Operating Parameters TA = -40 C to 150 C, VDD = 5.0V (unless otherwise specified)
Parameter.
Symbol
Max
Units
4.5
5.5
V
No output load,
VDD=5V±10%
4
9
mA
Output
capacitive load
10Ω < RSERIES <
10 kΩ
0
100
nF
Output resistive
load
To reach
5%VDD to
95%VDD
2.4
kΩ
± 1.9
mA
Supply Voltage
VDD
Supply Current
IDD
Comments
Output current
capability
Min
Typ
VDD=5V±10%
Output short
circuit current
±50
mA
Digital output
current
±2
±5
mA
VDD line
inductance
0
22
µH
Max
Units
442
V/V
Signal path general Specifications
Parameter.
Symbol
Comments
Overall gain
Coarse gain
Gdido
Gdts
Gcs
Fine gain
Typical sensor
output span that
can be
accommodated
to achieve 4V
output span
3901090326
Rev 002
Min
Typ
12.7
Fgain
1bit
programmable
V/V
3.25 (Gdido = 0)
13 (Gdido = 1)
1bit
programmable
V/V
2 (Gdts = 0)
5 (Gdts = 1)
1bit
programmable
10 bit
programmable
V/V
1.24 (Gcs = 0)
1.9375 (Gcs =1)
0.448
0.99
V/V
1.8
63
mV/Vsupply
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MLX90326
Analog 0-5V Sensor Interface IC
Typical sensor
offset that can
be compensated
10
Output Offset
programmable
Output Offset
resolution
Overall non
linearity
Best fit value
Wake-up time at
power up
97.2
mV/Vsupply
90
%VDD
0.1
%VDD
±0.1
%VDD
10
ms
Output noise
47nF FLT
capacitance with
maximum gain
5
mVrms
Response time
Set by an
external
capacitor
0.1
ms
Table 3: Electrical specifications
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MLX90326
Analog 0-5V Sensor Interface IC
6 General Description
The MLX90326 can be used with almost any type of resistive bridge sensor without the need of any
additional signal conditioning.
The differential input signal is offset compensated and amplified to achieve the desired output voltage. With a
coarse gain calibration the MLX90326 can easily accommodate sensor output spans in the 1.8mV/V to
63mV/V range to achieve 4 V output span. Sensor output offsets up to 97.2mV/V (depending on the sensor
output span and on the desired output offset) can be compensated with the coarse offset calibration to
achieve an output offset in the 0.5V to 4.5V range.
7 Unique Features
Offset canceling
The offset of amplifier DIDO is cancelled by using a chopping mechanism. Also the
amplifier DTS and all sample-and-hold circuits make use of an offset canceling mechanism. This means
that the contribution of the on-chip offsets and offset drifts is negligible compared to the external sensor
offset and offset drift.
Coarse and fine second order calibration of the sensitivity and offset.
The MLX90326 can be calibrated to achieve 4V output span for a sensor output span in the 1.8mV/V to
63mV/V and can compensate 0.4mV/V to 97.2mV/V input offset depending on the sensor output span and on
the desired MLX90326 output offset voltage. A wide range of sensor sensitivity and offset temperature drift
can be compensated with the second order fine gain and offset calibration.
EEPROM
All the calibration data is stored three times on an EEPROM and a majority voting is done when accessing
data. Parity check is used to diagnose data corruption. After all calibrations parameters were successfully
written to EEPROM, the EEPROM can be locked by sending a ‘Lock EEPROM’ command (see paragraph 6).
This is strongly recommended to avoid in application mode data corruption. For reliability reasons, actually
each calibration bit is stored three times in the EEPROM and the circuit uses a hardware majority voting
system when accessing data.
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MLX90326
Analog 0-5V Sensor Interface IC
8 Application Information
VDD
8.1 Ratio-metric mode with external temperature sensor.
The external temperature sensor is only needed for applications where the temperature surrounding the
customer sensor is different from the temperature surrounding the MLX90326. In the ratio-metric application
mode, to keep the accuracy, the same supply should be used for the customer sensor, the MLX90326 and an
ADC that makes the digital conversion of the analog output signal.
The C1 capacitor value (output) is typically 47nF. Range: 0 – 100nF.
The capacitor C2 on the FLT pin is optional. Typical value = 10nF. Range: 0 – 100nF. It is used to decrease
the noise and set the bandwidth of the system. The decoupling capacitors C3 between the supply and the
ground and C4 between output and supply have a typical value of 47nF.
The external resistor R1 is placed between the TMP pin and the supply. It is used as an external temperature
sensor. The external temperature sensor could be of type Panasonic, ERAS15J103V (R1 = 10k +/- 5%, TCR
= 1500ppm/degC +/- 200ppm/degC) for the -40ºC to 140ºC temperature range.
Typical pull up resistor R2 value is 2.4kOhm.
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MLX90326
Analog 0-5V Sensor Interface IC
8.2 Ratio-metric mode with no external temperature sensor.
VDD
VDD
INM
INP
C3
1
2
3
4
5
6
7
14
13
12
11
10
9
8
C4
R2
OUT
FLT
C1
C2
C1, C2, C3, C4 and R2 have the same values as for the ratio-metric application with use of external
temperature sensor.
The internal temperature sensor can be used when the temperature surrounding the customer sensor and
the MLX90326 is the same.
8.3 Non Ratio-metric mode with external temperature sensor.
VDD
VDD
Vbat
LM7805
C3
INM
VDD
INP
R1
1
2
3
4
5
6
7
14
13
12
11
10
9
8
C4
R2
OUT
FLT
C1
C2
With the use of an external voltage regulator to supply the sensor, the MLX90326 as well as an ADC used for
converting the analog output signal, the MLX90326 can be used in a non ratio-metric mode. An example of
standard voltage regulator is the LM7805. C1, C2, R1 and R2 are the same as in the ratio-metric application
mode. C4 has a typical value of 330nF and C3 of 100nF in this application mode.
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MLX90326
Analog 0-5V Sensor Interface IC
8.4 Non Ratio-metric mode with no external temperature sensor.
VDD
VDD
Vbat
LM7805
C3
INM
INP
1
2
3
4
5
6
7
14
13
12
11
10
9
8
R2
C4
OUT
FLT
C1
C2
In this application mode the LM7805 generates the supply for the sensor, for the MLX90326 and for an ADC
used to convert the analog output signal in a digital value. C1, C2, C3, C4 and R2 are the same as in the non
ratio-metric application mode with external temperature sensor.
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MLX90326
Analog 0-5V Sensor Interface IC
9 Standard information regarding manufacturability of Melexis products
with different soldering processes
Our products are classified and qualified regarding soldering technology, solderability and moisture sensitivity
level according to following test methods:
Reflow Soldering SMD’s (Surface Mount Devices)
•
•
IPC/JEDEC J-STD-020
Moisture/Reflow Sensitivity Classification for Nonhermetic Solid State Surface Mount Devices
(classification reflow profiles according to table 5-2)
EIA/JEDEC JESD22-A113
Preconditioning of Nonhermetic Surface Mount Devices Prior to Reliability Testing
(reflow profiles according to table 2)
Wave Soldering SMD’s (Surface Mount Devices) and THD’s (Through Hole Devices)
•
•
EN60749-20
Resistance of plastic- encapsulated SMD’s to combined effect of moisture and soldering heat
EIA/JEDEC JESD22-B106 and EN60749-15
Resistance to soldering temperature for through-hole mounted devices
Iron Soldering THD’s (Through Hole Devices)
•
EN60749-15
Resistance to soldering temperature for through-hole mounted devices
Solderability SMD’s (Surface Mount Devices) and THD’s (Through Hole Devices)
•
EIA/JEDEC JESD22-B102 and EN60749-21
Solderability
For all soldering technologies deviating from above mentioned standard conditions (regarding peak
temperature, temperature gradient, temperature profile etc) additional classification and qualification tests
have to be agreed upon with Melexis.
The application of Wave Soldering for SMD’s is allowed only after consulting Melexis regarding assurance of
adhesive strength between device and board.
Melexis is contributing to global environmental conservation by promoting lead free solutions. For more
information on qualifications of RoHS compliant products (RoHS = European directive on the Restriction Of
the use of certain Hazardous Substances) please visit the quality page on our website:
http://www.melexis.com/quality.asp
10 ESD Precautions
Electronic semiconductor products are sensitive to Electro Static Discharge (ESD).
Always observe Electro Static Discharge control procedures whenever handling semiconductor products.
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MLX90326
Analog 0-5V Sensor Interface IC
11 Package Information
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MLX90326
Analog 0-5V Sensor Interface IC
12 Disclaimer
Devices sold by Melexis are covered by the warranty and patent indemnification provisions appearing in its
Term of Sale. Melexis makes no warranty, express, statutory, implied, or by description regarding the
information set forth herein or regarding the freedom of the described devices from patent infringement.
Melexis reserves the right to change specifications and prices at any time and without notice. Therefore, prior
to designing this product into a system, it is necessary to check with Melexis for current information. This
product is intended for use in normal commercial applications. Applications requiring extended temperature
range, unusual environmental requirements, or high reliability applications, such as military, medical lifesupport or life-sustaining equipment are specifically not recommended without additional processing by
Melexis for each application.
The information furnished by Melexis is believed to be correct and accurate. However, Melexis shall not be
liable to recipient or any third party for any damages, including but not limited to personal injury, property
damage, loss of profits, loss of use, interrupt of business or indirect, special incidental or consequential
damages, of any kind, in connection with or arising out of the furnishing, performance or use of the technical
data herein. No obligation or liability to recipient or any third party shall arise or flow out of Melexis’ rendering
of technical or other services.
© 2005 Melexis NV. All rights reserved.
For the latest version of this document, go to our website at
www.melexis.com
Or for additional information contact Melexis Direct:
Europe, Africa, Asia:
Phone: +32 1367 0495
E-mail: [email protected]
America:
Phone: +1 603 223 2362
E-mail: [email protected]
ISO/TS 16949 and ISO14001 Certified
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