MLX90818LXE-BAE-017-SP 数据手册
MLX90818
Absolute Pressure Sensor
1. Features and Benefits
2. Application Examples
High accuracy absolute pressure sensor
±0.5% to ±0.75% for extended life
operation at 150°C
Digital SENT output with available
compensated
±1°C
accurate
NTC
temperature information
System in a package: MEMS, analog front
end circuitry, 16 bit microcontroller,
voltage regulators, SENT driver
Large automotive temperature range
(-40°C to 150°C)
Excellent harsh media compliance
Automotive qualified and automotive
diagnostic features (clamping levels,
multiple internal fault diagnostics)
Factory calibrated or fully programmable
through the connector for customized
calibration curves at customers
Assembled in a rugged easy to use 4x5mm
DFN package
Automotive applications with absolute
pressure from 1bar to 5.5bar
Manifold and Turbo Manifold Air Pressure
Manifold and Turbo Manifold Air Pressure
combined with Temperature
3. Ordering information
Product Code
Temperature
Code
Package
Code
Option Code
Packing
Form Code
MLX90818
L
XE
BBG-015
RE
MLX90818
L
XE
BBG-016
RE
MLX90818
L
XE
BBG-017
RE
Legend:
Temperature Code:
Package Code:
Option Code:
Packing Form:
Ordering example:
L (-40°C to 150°C)
XE = DFN14
BBG-015 = 0.1 to 4bar absolute pressure / 193 to 3896LSB SENT output / no NTC
BBG-016 = 0.1 to 3bar absolute pressure / 193 to 3896LSB SENT output / NTC
BBG-017 = 0.1 to 4bar absolute pressure / 193 to 3896LSB SENT output / NTC
RE = Reel
MLX90818LXE-BBG-015-RE
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MLX90818
Absolute Pressure Sensor
4. Functional Diagram
Temperature
sensor
Piezoresistive
sensing element
Broken wire
detection
Test
Gain & Offset
compensation
OPA
Diagnostic signals
5. General Description
Supply
Analog & Digital
Regulator and
POR
DSP
M
U
X
Overvoltage &
reverse voltage
protection
ADC
Micro controller
16 bits
Gain & Offset temperature
compensation
Pressure lineariztion
Programmable filter
Slew
rate
control
SENT
driver
SENT
Output
Diagnostics Logic
Rom
FW
EE
PROM
Ram
NTC interface
Ground
NTC (optional)
Figure 1: Functional block diagram
The MLX90818 is a packaged, factory calibrated,
absolute pressure sensor delivering a digital
output signal using the SENT protocol.
Use of an optimized architecture and a high
density CMOS technology imparts the MLX90818
with best in class automotive EMC performance.
A DSP based architecture using a 16bit
microcontroller
provides
outstanding
performance in terms of initial accuracy.
A smart package and die assembly concept suits
applications
with
stringent
automotive
temperature and stress conditions needing small
drift over life.
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MLX90818
Absolute Pressure Sensor
Contents
1. Features and Benefits ............................................................................................................................ 1
2. Application Examples............................................................................................................................. 1
3. Ordering information............................................................................................................................. 1
4. Functional Diagram ............................................................................................................................... 2
5. General Description ............................................................................................................................... 2
6. Glossary of Terms .................................................................................................................................. 4
7. Absolute Maximum Ratings ................................................................................................................... 4
8. Pin Definitions and Descriptions ............................................................................................................ 5
9. General Electrical Specifications ............................................................................................................ 6
10. Detailed General Description............................................................................................................... 7
11. Default programmed settings .............................................................................................................. 8
11.1. MLX90818LXE-BBG-015 ................................................................................................................. 10
11.2. MLX90818LXE-BBG-016 ................................................................................................................. 11
11.3. MLX90818LXE-BBG-017 ................................................................................................................. 12
12. Filters ................................................................................................................................................ 13
12.1. PFLT ................................................................................................................................................. 13
12.2. SSF ................................................................................................................................................... 13
13. Analog Front End ............................................................................................................................... 15
14. ADC ................................................................................................................................................... 17
15. Digital ................................................................................................................................................ 17
16. NTC Temperature Linearization ......................................................................................................... 18
17. SENT Configuration............................................................................................................................ 19
17.1. Fast Channel Configuration ............................................................................................................ 19
17.2. Slow Channel Configuration ........................................................................................................... 20
18. Wrong Connections Overview ........................................................................................................... 25
19. Diagnostics ........................................................................................................................................ 26
19.1. Input Diagnostics ............................................................................................................................ 26
19.2. Diagnostic Sources .......................................................................................................................... 26
19.3. Fast and Slow Channel Diagnostics ................................................................................................ 27
20. Timings .............................................................................................................................................. 32
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Absolute Pressure Sensor
21. Application Information..................................................................................................................... 33
22. Standard information regarding manufacturability of Melexis products with different soldering
processes............................................................................................................................................ 34
23. ESD Precautions................................................................................................................................. 34
24. Package Information.......................................................................................................................... 35
25. PCB Land Pattern Recommendation .................................................................................................. 36
26. Contact .............................................................................................................................................. 37
27. Disclaimer .......................................................................................................................................... 37
6. Glossary of Terms
Bar: Pressure unit (1bar = 100kPa)
POR: Power-on Reset
ADC: Analog to Digital Converter
DSP: Digital Signal Processor
EMC: Electro Magnetic Compatibility
SENT: Single Edge Nibble Transmission
OV: Over Voltage
UV: Under Voltage
FC: SENT Fast Channel
FC1: SENT Fast Channel 1
FC2: SENT Fast Channel 2
7. Absolute Maximum Ratings
Parameter
Supply Voltage (overvoltage)
Value
18
Units
V
Reverse Voltage Protection
-18
V
Positive output voltage
18
V
Reverse output voltage
-18
V
Operating Temperature Range
-40 to 150
°C
Storage Temperature Range
-40 to 150
°C
Programming Temperature Range
-40 to 125
°C
15
Bar
Burst pressure (Room Temperature)
Table 1: Absolute maximum ratings
Exceeding the absolute maximum ratings may cause permanent damage. Exposure to absolute-maximum-rated
conditions for extended periods may affect device reliability.
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MLX90818
Absolute Pressure Sensor
8. Pin Definitions and Descriptions
14
1
8
7
Figure 2: Package pinout (bottom view)
Pin number
1
2
3
4
5
6
7
Description
Test pin
Not Connected
SENT output
Not Connected
Test pin
Not Connected
Supply input
Pin number
14
13
12
11
10
9
8
Description
Ground
Not Connected
NTC input
Not Connected
Ground
Not Connected
NTC input
Table 2: Pinout definitions and descriptions
18VZZZ
Figure 3: Package marking (top view)
Symbol
Function / Description
V
MEMS and ASIC traceability letter
ZZZ
Last 3 digits of ASIC lot number
YY
Year of assembly
WW
Calendar week of assembly
XX
Last 2 digits of the sensor wafer lot #
Table 3: Package marking definition
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MLX90818
Absolute Pressure Sensor
9. General Electrical Specifications
DC Operating Parameters TA = -40°C to 150°C
Parameter
Symbol
Nominal supply voltage Vdd
Nominal supply current Idd
Decoupling capacitor on
supply
Supply series resistor
Capacitive load on
output
Min
4.5
Typ(1)
5
8.3
100
Max
5.5
9.5
Units
V
mA
nF
0
10
27
Ohm
No output load, no NTC connected
Not mandatory but recommended
for optimal EMC performance
Pure capacitive load
CRC load circuit
(C close to device + Series R + C
close to connector)
Resistive load on output
Supply programming
Vdd_com
entry level
Analog POR level (rising)
Analog POR hysteresis
Digital POR level (rising)
Digital POR hysteresis
Power up time
Pull-up to Vdd at receiver
(2)
Threshold to enter communication
mode
10
6.2
3.1
100
2.05
10
2.2
10
1.1nF + 2.2nF +
100Ω + 220Ω +
1.1nF
2.2nF
55
7
7.8
3.5
2.3
Time from reaching minimum
allowed supply voltage of 4.5V till
the first falling edge of the first
SENT frame
Using default filter setting PFLT = 0
and SSF = 1. Tick time = 3us and
Pause Pulse enabled.
For other configurations refer to
Table 8 in chapter 12.
Default configuration BBG-015,
BBG-016 and BBG-017. Other
configurations in Table 9.
Response time(3)
Pressure output noise
Sensing element supply
voltage
Sensing element
sensitivity
On chip temperature
accuracy
ADC resolution
Input voltage range on
NTC pin
Remarks
VDDA
-9%
3.5
-10
1
Typical values are defined at T A = +25 °C and VDD = 5V.
2
As specified in the SENT standard
3
Number of SENT frames between pressure step and settled output (last frame containing stable pressure data)
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3901090818
V
500
2.7
200
1.1
mV
V
mV
msec
3
SENT
frames
3
LSB pk-pk
+9%
V
mV/V/bar
+10
°C
3.5
Bit
V
16
0
kOhm
V
3.9
9
On chip PTAT temperature
nF
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MLX90818
Absolute Pressure Sensor
Parameter
Symbol
NTC Temperature
Output noise
NTC Temperature range
NTC Temperature
response time
Remarks
Min
Typ(1)
-55
Max
1
Units
LSB pk-pk
200
100
°C
msec
Table 4: Electrical specifications
10. Detailed General Description
The MLX90818 contains a pressure sensing element which consists of a diaphragm realized in the silicon chip by
wafer bonding on an etched cavity with built in reference vacuum. The diaphragm reacts to a change in absolute
pressure. The internal strain increases, in particular at the border of the diaphragm. Here, the piezo-resistive
elements have been implanted into the silicon diaphragm forming a Wheatstone bridge, which act as a
transducer.
The electronics front end amplifies the signal from the bridge, performs a coarse offset compensation and an
ADC conversion. The DSP performs the compensations over temperature. Furthermore, the digital circuit
provides some filtering, the possibility to linearize the pressure signal and also implements the clamping function.
This chip delivers a SENT output compliant with SAE J2716 spec dated April 2016. On one of the fast channels of
the SENT message it is possible to select to transmit linearized and calibrated temperature information measured
by an external NTC thermistor. An analog interface is available for the external thermistor and the 16bits DSP
performs the calibration and linearization of the measured thermistor temperature.
Extensive protection of the supply lines allows the MLX90818 to handle extreme overvoltage conditions and is
immune to severe external disturbances. Several diagnostic functions (over-voltage, under-voltage, overpressure,
under pressure detections) have been implemented on the 90818 and can be enabled by programming EEPROM
settings. Figure 4 describes MLX90818 block diagram.
Temperature
sensor
Piezoresistive
sensing element
Broken wire
detection
Test
Gain & Offset
compensation
OPA
Diagnostic signals
Supply
Analog & Digital
Regulator and
POR
DSP
M
U
X
Overvoltage &
reverse voltage
protection
ADC
Micro controller
16 bits
Gain & Offset temperature
compensation
Pressure lineariztion
Programmable filter
Slew
rate
control
SENT
driver
SENT
Output
Diagnostics Logic
Rom
FW
EE
PROM
Ram
NTC interface
Ground
NTC (optional)
Figure 4: MLX90818 block diagram
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MLX90818
Absolute Pressure Sensor
11. Default programmed settings
The MLX90818 is calibrated at the final manufacturing test steps. During the calibration, settings are stored in the
on chip EEPROM to define the pressure transfer curve. Besides pressure, the internal temperature and optionally
the NTC temperature calibrations are performed. The default temperature characteristic can be found in the
graph of Figure 5. The SENT parameters and the IC filter values are also configured.
SENT Output
in LSB
4088
1
Temperature in °C
-73.025
437.85
Figure 5: NTC and internal temperature transfer function
SENT Output
in LSB
HCL
O2
εp
εo
Absolute Pressure
in Bar
O1
LCL
P1
P2
Figure 6: Pressure transfer function description at room temperature
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MLX90818
Absolute Pressure Sensor
Temperature Factor
Pressure Accuracy
Fe
Fc
-40
-20
10
35
60
85
110
135
150
Temperature (°C)
Fc
Fe
Figure 7: Pressure accuracy temperature factor
Temperature Accuracy
(°C)
εTe
εTc
-40
35
100
150
170
Temperature (°C)
εTc
εTe
Figure 8: NTC temperature accuracy
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MLX90818
Absolute Pressure Sensor
11.1. MLX90818LXE-BBG-015
Transfer Curve
Parameter
Pressure 1
Pressure 2
Output 1
Output 2
Low clamping level
High clamping level
Pressure Accuracy
Parameter
Symbol
Remarks
P1
P2
O1
O2
LCL
HCL
See Figure 6: Pressure
transfer function
description at room
temperature
Symbol
Remarks
Output accuracy
εo
Pressure accuracy
εp
Center temperature
accuracy factor
Extended temperature
accuracy factor
Fc
Overall accuracy
expressed as output
value (FS range from
193 to 3896)
Overall accuracy
expressed as pressure
value
See Figure 7: Pressure
accuracy temperature
factor
Value
Unit
0.1
4
193
3896
1
4088
Min
Max
Unit
-19
-0.5
19
0.5
LSB
%FS
-20
20
mBar
Fe
Typ
Bar
Bar
LSB
LSB
LSB
LSB
1
1.5
Table 5: BBG-015 Default configuration
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MLX90818
Absolute Pressure Sensor
11.2. MLX90818LXE-BBG-016
Transfer Curve
Parameter
Pressure 1
Pressure 2
Output 1
Output 2
Low clamping level
High clamping level
Pressure Accuracy
Parameter
Symbol
Remarks
P1
P2
O1
O2
LCL
HCL
See Figure 6: Pressure
transfer function
description at room
temperature
Symbol
Remarks
Output accuracy
εo
Pressure accuracy
εp
Center temperature
accuracy factor
Extended temperature
accuracy factor
NTC Accuracy
Parameter
Fc
Overall accuracy
expressed as output
value (FS range from
193 to 3896)
Overall accuracy
expressed as pressure
value
See Figure 7: Pressure
accuracy temperature
factor
Value
Unit
0.1
3
193
3896
1
4088
Min
Typ
Max
Unit
-19
-0.5
19
0.5
LSB
%FS
-15
15
mBar
1
1.5
Fe
Symbol
Center NTC
temperature accuracy
εTc
Extended NTC
temperature accuracy
εTe
Bar
Bar
LSB
LSB
LSB
LSB
Remarks
Overall accuracy
using the default NTC
as described in Table
12
See Figure 8: NTC
temperature accuracy
Min
Typ
Max
Unit
-1
1
°C
-2
2
°C
Table 6: BBG-016 Default Configuration
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MLX90818
Absolute Pressure Sensor
11.3. MLX90818LXE-BBG-017
Transfer Curve
Parameter
Pressure 1
Pressure 2
Output 1
Output 2
Low clamping level
High clamping level
Pressure Accuracy
Parameter
Symbol
Remarks
P1
P2
O1
O2
LCL
HCL
See Figure 6: Pressure
transfer function
description at room
temperature
Symbol
Remarks
Output accuracy
εo
Pressure accuracy
εp
Center temperature
accuracy factor
Extended temperature
accuracy factor
NTC Accuracy
Parameter
Fc
Overall accuracy
expressed as output
value (FS range from
193 to 3896)
Overall accuracy
expressed as pressure
value
See Figure 7: Pressure
accuracy temperature
factor
Value
Unit
0.1
4
193
3896
1
4088
Min
Typ
Max
Unit
-19
-0.5
19
0.5
LSB
%FS
-20
20
mBar
1
1.5
Fe
Symbol
Center NTC
temperature accuracy
εTc
Extended NTC
temperature accuracy
εTe
Bar
Bar
LSB
LSB
LSB
LSB
Remarks
Overall accuracy
using the default NTC
as described in Table
12
See Figure 8: NTC
temperature accuracy
Min
Typ
Max
Unit
-1
1
°C
-2
2
°C
Table 7: BBG-017 Default Configuration
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MLX90818
Absolute Pressure Sensor
12. Filters
There are two filters available to filter the pressure signal. The first filter is a Small Signal Filter which can be
disabled or enabled. The second filter is a first order low pass filter for the pressure signal which has a
programmable depth.
An overview of the noise levels using different filter and gain combinations can be found in Table 9.
12.1. PFLT
PFLT is a programmable first order low pass filter. The depth of this filter can be selected. This filter can be
configured to select the optimal trade-off between response time and output noise.
The low pass filter is implemented according to the following formula:
( )
( )
(
)
(
)
The PFLT parameter in the formula is set in EEPROM and can have a value between 0 and 9. An overview of
typical response times when applying a step on the input using different PFLT filter settings can be found in Table
8. The number of SENT frames indicated in the table includes the last frame which contains stable pressure data.
Filter setting 0 disables the PFLT.
PFLT setting
0
1
2
3
4
5
6
7
8
9
Response time
in SENT
frames(4)
3
3
4
7
13
23
45
88
173
346
Table 8: Filter settings with corresponding typical response times
12.2. SSF
The SSF (Small Signal Filter) is a digital filter which is designed not to have an impact on the response time of a
fast changing pressure signal like a pressure step. When a large signal change at the input is present, the filter is
bypassed and not filtering the signal. For small signal changes, which are in most cases noise, the filter is used
and filtering the pressure signal.
4
Tick time is set to 3us and Pause Pulse is enabled.
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MLX90818
Absolute Pressure Sensor
The Small Signal Filter can be enabled or disabled in EEPROM. It is advised not to use the SSF in combination with
the PFLT enabled.
Analog front
end gain (CG)
0
0
0
0
0
0
0
0
0
0
0
0
10
10
10
10
10
10
10
10
10
10
10
10
31
31
31
31
31
31
31
31
31
31
31
31
Digital gain
(G0)
10000
10000
10000
10000
17000
17000
17000
17000
30000
30000
30000
30000
10000
10000
10000
10000
17000
17000
17000
17000
30000
30000
30000
30000
10000
10000
10000
10000
17000
17000
17000
17000
30000
30000
30000
30000
PFLT setting
SSF
0
1
4
9
0
1
4
9
0
1
4
9
0
1
4
9
0
1
4
9
0
1
4
9
0
1
4
9
0
1
4
9
0
1
4
9
1
0
0
0
1
0
0
0
1
0
0
0
1
0
0
0
1
0
0
0
1
0
0
0
1
0
0
0
1
0
0
0
1
0
0
0
Noise
(LSB pk-pk)
2
2
1
1
2
2
1
0
4
3
2
1
3
2
1
0
4
4
2
1
5
5
3
1
8
8
6
3
12
11
10
4
41
38
15
8
Table 9: Filter settings and gain combinations with corresponding pressure noise values
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MLX90818
Absolute Pressure Sensor
13. Analog Front End
The analog front end of the MLX90818 consists of a chopping stage and 3 amplification stages as can be seen in
Figure 9. There are also several input diagnostics integrated into this front end to be able to detect a broken InP
or InN connection or an input which is out of range. This diagnostic information is transferred to the
microcontroller to handle further action for example flagging a diagnostic message.
G = 4.5 to 10.5
3 bits
G = 1.25 or 3.5
CSOF: 1/3 to 2/3
of VDDA
G = 1.6, 3.2 or 6.4
InP
Input
Diag
nostics
InN
OPA
Chopping
1us/phase
Stage 1:
Instrumentation amplifier
OPA
Stage 2:
Differential amplifier
Stage 3:
Integrator
Figure 9: Analog front end block diagram
The first stage is an instrumentation amplifier of which the gain can be programmed using 3 bits to cover a gain
range between 4.5 and 10.6.
Transfer equation:
OUTP1 – OUTN1 = Gst1*(InP – InN) in phase 1
OUTP1 – OUTN1 = Gst1*(InN – InP) in phase 2
The second stage is a fully differential amplifier. The gain of the amplifier can be calibrated using 1 bit.
Transfer equation:
OUTP2 – OUTN2 = -Gst2*(OUTP1 – OUTN1) – Gst2*(CSOF1 – CSOF2) in phase 1
OUTP2 – OUTN2 = -Gst2*(OUTN1 – OUTP1) – Gst2*(CSOF2 – CSOF1) in phase 2
The CSOF1 and CSOF2 signals are generated by the coarse offset DAC with the following transfer functions:
VDDA
2 1 VDDA CO[6 : 0]
CO7
1 * *
*
2
2
127
3 3
VDDA
2 1 VDDA CO[6 : 0]
CO7
CSOF 2
1 * *
*
2
2
127
3 3
CSOF1
CO[6:0] fixes the DAC output. CO7 is used for the polarity.
The third stage is an integrator which is controlled using 2 bits to set a gain between 1.6 and 6.4
Transfer equation at the outputs of the amplifier:
OUTP3 – OUTN3 = -N*(C1/C2)*(OUTP2 – OUTN2)
OUTP3_common_mode and OUTN3_common_mode = VCM = VDDA/2
In this equation N represents the number of integration cycles which is a fixed value of N = 40.
C2 is a fixed feedback capacitor of approximately 5pF. C1 can have 3 different values: 0.2pF, 0.4pF or 0.8pF.
Transfer equation after the ADC:
Pressure_ADC = ((OUTN3 – OUTP3)*216/VDDA) + 32768
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MLX90818
Absolute Pressure Sensor
An overview of all possible values for Gst1, Gst2 and Gst3 can be found in Table 10 below.
The input stage is designed to work with an input common-mode voltage range between 42%Vbrg and 58%Vbrg.
Gain
setting
Gst1
Gst2
Gst3
Total
gain
FS Differential
Input Signal
[-]
[V/V]
[V/V]
[V/V]
[V/V]
[mV]
4.49
5.06
5.8
6.52
7.43
8.37
9.35
10.6
4.49
5.06
5.8
6.52
7.43
8.37
9.35
10.6
4.49
5.06
5.8
6.52
7.43
8.37
9.35
10.6
4.49
5.06
5.8
6.52
7.43
8.37
9.35
10.6
-1.25
-1.25
-1.25
-1.25
-1.25
-1.25
-1.25
-1.25
-3.5
-3.5
-3.5
-3.5
-3.5
-3.5
-3.5
-3.5
-3.5
-3.5
-3.5
-3.5
-3.5
-3.5
-3.5
-3.5
-3.5
-3.5
-3.5
-3.5
-3.5
-3.5
-3.5
-3.5
1.6
1.6
1.6
1.6
1.6
1.6
1.6
1.6
1.6
1.6
1.6
1.6
1.6
1.6
1.6
1.6
3.2
3.2
3.2
3.2
3.2
3.2
3.2
3.2
6.4
6.4
6.4
6.4
6.4
6.4
6.4
6.4
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
-9.0
-10.1
-11.6
-13.0
-14.9
-16.7
-18.7
-21.2
-25.1
-28.3
-32.5
-36.5
-41.6
-46.9
-52.4
-59.4
-50.3
-56.7
-65.0
-73.0
-83.2
-93.7
-104.7
-118.7
-100.6
-113.3
-129.9
-146.0
-166.4
-187.5
-209.4
-237.4
± 195
± 173
± 151
± 134
± 118
± 105
± 94
± 83
± 70
± 62
± 54
± 48
± 42
± 37
± 33
± 29
± 35
± 31
± 27
± 24
± 21
± 19
± 17
± 15
± 17
± 15
± 13
± 12
± 11
±9
±8
±7
Table 10: Gain and input signal range of the analog front end
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14. ADC
The 16 bit differential ADC has a range from –VDDA/2 to +VDDA/2.
There are 7 different ADC channels. Channel 0 is not used. Table 11 below describes all the channels.
ADC
Signal
Remarks
SIN[2:0]
0
1
2
3
4
5
6
7
P
Tint
Vsup
InP/InN
Vdig
Tntc
VBE
Nothing connected
Pressure
Internal Temperature
External Supply
Multiplexing between Positive/Negative Sensor Output
Digital Regulator
NTC Output
Internal Voltage
Table 11: ADC channels
The different channels are converted in a constantly repeating sequence at a rate of 50µsec for each individual
conversion. The order is shown in Figure 10 below.
P
Tint
P
VBE
P
Tntc
P
Vsup
P
InP/InN
P
VBE
P
Tntc
P
Vdig
P
Tint
P
...
Figure 10: ADC sequence
15. Digital
The digital is built around a 16-bit microcontroller. It contains besides the processor also ROM, RAM and EEPROM
and a set of user and system IO registers.
Temperature compensation of the pressure signal and pressure linearization is handled by the microcontroller.
For the pressure compensation there are EEPROM parameters allocated to be able to cover a large variety of
calibration approaches.
Both for gain and offset of the pressure signal, there is a separate temperature dependency programmable
ranging from a temperature independence to a first order, second order and finally a third order compensation.
This is reflected in EEPROM parameters for the offset (O0, O1, O2 and O3) and for the gain (G0, G1, G2 and G3).
If required, the linearity of the pressure signal can also be compensated without a temperature dependency or
with a first order temperature dependency through EEPROM parameters L0 and L1.
Linearization of the NTC temperature is also covered partially by the microcontroller. More information in this
topic can be found in chapter 16.
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16. NTC Temperature Linearization
The linearization of the NTC temperature signal is split up in several stages. A schematic overview of these steps
can be seen in Figure 11.
VDDA
3 or 4 points
MLX calibration
@ 3 temp
Rs
Vdiv
ADC_raw[15:0]
VDDA/2
ADC
Calibration
&
Compensation
Rntc
ADC_comp[15:0]
LUT
ADC_ROM
=>
Tntc
Figure 11: Block diagram NTC linearization
The complete system can be divided into 5 separate stages.
1. A resistor divider with internal resistor Rs is used to linearize Rntc into a voltage.
2. A fully differential amplifier with unity gain is used to drive the ADC.
3. The 16-bit ADC is being used to convert the analog resistor divider output voltage into a digital signal
called ADC_raw.
4. With the help of calibration data saved in EEPROM the microcontroller will perform a first compensation
on ADC_raw converting in to ADC_comp. This new value is targeted to be as close as possible to the value
ADC_ROM.
5. Finally a look up table (LUT) will be used to convert the ADC_ROM values into the Tntc value which is the
desired linearized NTC temperature.
The default NTC characteristic which is calibrated on option codes BBG-016 and BBG-017 can be found in Table
12. When using an NTC which does not match the coefficients described above, it is advised to contact Melexis.
The EEPROM coefficients which are used for the conversion from ADC_raw to ADC_comp are N0 to N3,
N0_Diff_Low to N3_Diff_Low, N0_Diff_High to N3_Diff_High and TEMP1 to TEMP3.
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Absolute Pressure Sensor
T (°C)
RT/R25
R (Ω)
-55
53.68 268400
-50
39.112 195560
-45
28.817 144085
-40
21.459 107295
-35
16.142
80710
-30
12.259
61295
-25
9.3959 46979.5
-20
7.2644
36322
-15
5.6633 28316.5
-10
4.4503 22251.5
-5
3.5236
17618
0
2.8102
14051
5
2.2567 11283.5
10
1.8243
9121.5
15
1.4841
7420.5
20
1.2147
6073.5
25
1
5000
30 0.82785 4139.25
35
0.689
3445
40 0.57639 2881.95
45 0.48457 2422.85
50 0.40931 2046.55
55 0.34731 1736.55
60 0.29599 1479.95
65 0.25332
1266.6
70 0.21768
1088.4
T (°C)
75
80
85
90
95
100
105
110
115
120
125
130
135
140
145
150
155
160
165
170
175
180
185
190
195
200
RT/R25
0.18779
0.16261
0.14131
0.12324
0.10783
0.094663
0.083361
0.073638
0.06524
0.057964
0.05164
0.046128
0.041309
0.037085
0.033373
0.030102
0.027213
0.024654
0.022384
0.020364
0.018564
0.016955
0.015515
0.014223
0.013063
0.012017
R (Ω)
938.95
813.05
706.55
616.2
539.15
473.315
416.805
368.19
326.2
289.82
258.2
230.64
206.545
185.425
166.865
150.51
136.065
123.27
111.92
101.82
92.82
84.775
77.575
71.115
65.315
60.085
Table 12: Default NTC characteristic
17. SENT Configuration
The SENT output is designed to be compliant with the SAE J2716 rev. Apr 2016 SENT standard. The tick time is
configurable in EEPROM using parameter TICK_DIV. The available tick time settings are 3us, 4us, 6us, 10us, 12us
and 16us. A pause pulse can also be enabled to have a fixed frame length of 282 ticks. This can be done using
parameter PAUSE.
In the default configuration a tick time of 3us is selected and the pause pulse is enabled.
17.1. Fast Channel Configuration
On the fast channel, 8 different options are available to configure channel 1 and channel 2. An overview of these
different options and how to configure them can be found in Table 13.
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1
2
FC_CFG
setting
0
1
Pressure (3x 4 bit)
Pressure (3x 4 bit)
3
2
Pressure (3x 4 bit)
4
3
Pressure (3x 4 bit)
5
6
7
4
5
6
Pressure only (3x 4 bit)
Pressure only (4x 3 bit)
Data indicated by pointer 1
(3x 4 bit)
Inverse of Pressure (3x 4 bit)
Rolling counter (2x 4 bit) and
inverse of MSN of Pressure
(1x 4 bit)
Medium temperature
(3x 4 bit)
Internal temperature
(3x 4 bit)
/
/
Data indicated by pointer 2
(3x 4 bit)
8
7
Pressure (3x 4 bit)
0 (3x 4 bit)
#
Fast Channel 1
Fast Channel 2
Remark
Default
Configuration(5)
BBG-015
NTC temperature
BBG-016,
BBG-017
PTAT temperature
In this mode no
diagnostics are
available. FC
configuration only
used by Melexis.
Table 13: Fast channel configuration options
The selection of the fast channel output mode can be done by changing the parameter ‘FC_CFG’ in the EEPROM.
17.2. Slow Channel Configuration
The Slow Serial Channel is implemented according to the Enhanced Serial Message Format using 12 bit data and 8
bit message ID as described in the reference SENT protocol standard SAE J2716 rev. Apr 2016.
An overview of the different slow channel messages which are available in the MLX90818 can be found in Table
14. From this table 16 messages can be configured completely in EEPROM. The 12 bit data content of these
messages can be configured freely. The ID of programmable message PR0, PR1, PR2 and PR3 is copied from
EEPROM (2x 4 bit). The ID of PR5 is 1 bit higher than of PR4. The same is valid for the other pairs: PR6-7, PR8-9, …,
PR14-15. This programmable ID is indicated in Table 14 as 0xYZ.
All programmable messages can also be enabled and disabled, but not all independently of each other:
PR0, PR1, PR2 and PR3 can be each independently enabled or disabled
PR4 and PR5 are together enabled or disabled
PR6 and PR7 are together enabled or disabled
PR8, PR9, PR10 and PR11 are together enabled or disabled
PR12, PR13, PR14 and PR15 are together enabled or disabled
5
MLX90818 Option Code default configuration
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#
0
1
2
3
4
Type
RAM
EEPROM
EEPROM
EEPROM
RAM
ID
0x01
0x03
0x04
0x05
0x06
Description
Diagnostic codes
Sensor Type
Configuration code
Manufacturer Code
SENT revision
5
RAM
0x07
6
RAM
0x08
7
EEPROM 0xYZ
8
RAM
0x23
Fast channel 1
Characteristic X1
Fast channel 1
Characteristic X2
Fully Programmable
message 0
Internal Temperature
9
RAM
0x09
10 RAM
11 ROM
Fast channel 1
Characteristic Y1
0x0A Fast channel 1
Characteristic Y2
0x0B Fast channel 2
Characteristic X1
12 ROM
0x0C
Fast channel 2
Characteristic X2
13 ROM
0x0D Fast channel 2
Characteristic Y1
14 ROM
0x0E
Fast channel 2
Characteristic Y2
15 EEPROM 0x29
Sensor ID #1
16 EEPROM 0xYZ
Fully Programmable
message 1
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3901090818
Data
Error_flags (See chapter 0 Diagnostics)
Configurable 0 to 15
Configurable 0 to 4095
Configurable 0 to 4095
Selectable by bit in EEPROM
Data = 3 or 4
Fast channel 1 Characteristic Configuration
Enable / disable shared with MID08
Fast channel 1 Characteristic Configuration
Enable / disable shared with MID07
Programmable ID: 8 bit
Programmable Data: 12 bit
According to default linear temperature transfer
characteristic in SAE J2716 standard
Fast channel 1 Characteristic Configuration
Enable / disable shared with MID0A
Fast channel 1 Characteristic Configuration
Enable / disable shared with MID09
If FC2 is pressure (FC_CFG = 0): ID0B = ID07
If FC2is temperature (FC_CFG = 2 or 3):
Default temperature Characteristic X1: Fixed
value: 233
Enable / disable shared with MID0C / 0D / 0E
If FC2 is pressure (FC_CFG = 0): ID0C = ID08
If FC2is temperature (FC_CFG = 2 or 3):
Default temperature Characteristic X2: Fixed
value: 423
Enable / disable shared with MID0B / 0D / 0E
If FC2 is pressure (FC_CFG = 0): ID0D = ID09
If FC2is temperature (FC_CFG = 2 or 3):
Default temperature Characteristic Y1: Fixed
value: 264
Enable / disable shared with MID0B / 0C / 0E
If FC2 is pressure (FC_CFG = 0): ID0E = ID0A
If FC2is temperature (FC_CFG = 2 or 3):
Default temperature Characteristic Y2: Fixed
value: 1784
Enable / disable shared with MID0B / 0C / 0D
Programmable Data: 12 bit
Enable / disable shared with MID2A / 2B / 2C
Programmable ID: 8 bit
Programmable Data: 12 bit
Rep
Y
N
N
N
N
N
N
N
Y
N
N
N
N
N
N
N
N
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Absolute Pressure Sensor
Type
Description
#
ID
17 EEPROM 0x2A Sensor ID #2
18 EEPROM 0x2B
Sensor ID #3
19 EEPROM 0x2C
Sensor ID #4
20 EEPROM 0xYZ
Fully Programmable
message 2
21 EEPROM 0xYZ
22 EEPROM 0xYZ
Fully Programmable
message 3
Programmable message 4
23 EEPROM 0xYZ
Programmable message 5
24 EEPROM 0xYZ
Programmable message 6
25 EEPROM 0xYZ
Programmable message 7
26 EEPROM 0xYZ
27 EEPROM 0xYZ
28 EEPROM 0xYZ
29 EEPROM 0xYZ
Programmable message 8
Programmable message 9
Programmable message 10
Programmable message 11
Data
Programmable Data: 12 bit
Enable / disable shared with MID29 / 2B / 2C
Programmable Data: 12 bit
Enable / disable shared with MID29 / 2A / 2C
Programmable Data: 12 bit
Enable / disable shared with MID29 / 2A / 2B
Programmable ID: 8 bit
Programmable Data: 12 bit
Programmable ID: 8 bit
Programmable Data: 12 bit
Programmable ID: 8 bit
Programmable Data: 12 bit
Enable / disable shared with programmable
message 5
Message ID = ID programmable message 4 + 1
Programmable Data: 12 bit
Enable / disable shared with programmable
message 4
Programmable ID: 8 bit
Programmable Data: 12 bit
Enable / disable shared with programmable
message 7
Message ID = ID programmable message 6 + 1
Programmable Data: 12 bit
Enable / disable shared with programmable
message 6
Programmable ID: 8 bit
Programmable Data: 12 bit
Enable / disable shared with programmable
messages 9 / 10 / 11
Message ID = ID programmable message 8 + 1
Programmable Data: 12 bit
Enable / disable shared with programmable
messages 8 / 10 / 11
Programmable ID: 8 bit
Programmable Data: 12 bit
Enable / disable shared with programmable
messages 8 / 9 / 11
Message ID = ID programmable message 10 + 1
Programmable Data: 12 bit
Rep
N
N
N
N
N
N
N
N
N
N
N
N
N
Enable / disable shared with programmable
messages 8 / 9 / 10
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Type
#
ID
30 EEPROM 0xYZ
31 EEPROM 0xYZ
32 EEPROM 0xYZ
33 EEPROM 0xYZ
Description
Programmable message 12
Programmable message 13
Programmable message 14
Programmable message 15
34 RAM
0x10
Medium Temperature
35 RAM
0xE1
Device start-up check
Data
Programmable ID: 8 bit
Programmable Data: 12 bit
Rep
N
Enable / disable shared with programmable
messages 13 / 14 / 15
Message ID = ID programmable message 12 + 1
Programmable Data: 12 bit
N
Enable / disable shared with programmable
messages 12 / 14 / 15
Programmable ID: 8 bit
Programmable Data: 12 bit
N
Enable / disable shared with programmable
messages 12 / 13 / 15
Message ID = ID programmable message 14 + 1
Programmable Data: 12 bit
N
Enable / disable shared with programmable
messages 12 / 13 / 14
According to default linear temperature transfer
characteristic in SAE J2716 standard
Start-up self-check result data
Y
N
Table 14: Slow channel messages
Messages which have a “Y” in the column Rep of Table 14 can be selected to have a higher occurrence in the slow
channel message sequence. Their repetition rate can be configured as indicated in Table 15. The repeatable
messages MID01h, MID10h and MID23h can be configured individually to have their own repetition rate. The
repetition factor setting can be done in respectively “SENT_REP_FACT_ID_01”, “SENT_REP_FACT_ID_10” and
“SENT_REP_FACT_ID_23”.
Repetition Factor Setting
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
Real Repetition Factor
Message repetition disabled
Message repeat every 2 messages
Message repeat every 3 messages
Message repeat every 4 messages
Message repeat every 5 messages
Message repeat every 6 messages
Message repeat every 7 messages
Message repeat every 8 messages
Message repeat every 9 messages
Message repeat every 10 messages
Message repeat every 12 messages
Message repeat every 16 messages
Message repeat every 20 messages
Message repeat every 24 messages
Message repeat every 28 messages
Message repeat every 30 messages
Table 15: Repetition rate settings
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Once a message is configured to be repeatable, it will automatically have the highest priority. Therefore it will
appear first in the slow message sequence.
The priority order between MID01, MID10 and MID23 can also be configured using EEPROM parameter
“SC_R_O”:
SC_R_O = 0: Priority order: ID01h > ID10h > ID23h (default setting)
SC_R_O = 1: Priority order: ID10h > ID23h > ID01h
An overview of the default slow channel configurations for our different option codes can be found in Table 16.
Option
code
Info
BBG-015
BBG-016
BBG-017
Option
code
BBG-015
BBG-016
BBG-017
Option
code
BBG-015
BBG-016
BBG-017
0
0x01
1
0x03
2
0x04
3
0x05
4
0x06
5
0x07
6
0x08
7
0xYZ
8
0x23
9
0x09
10
0x0A
Enabled
Rep 6
ID
0x01
0x03
0x04
0x05
0x06
0x07
0x08
0x81
0x23
0x09
0x0A
Data
Diag.
0x004
0x000
0x006
0x004
0x053
0x144
0x000
Temp.
0x0C1
0xF38
Enabled
Rep 6
ID
0x01
0x03
0x04
0x05
0x06
0x07
0x08
0x81
0x23
0x09
0x0A
Data
Diag.
0x007
0x000
0x006
0x004
0x053
0x0F4
0x000
Temp.
0x0C1
0xF38
Enabled
Rep 6
ID
0x01
0x03
0x04
0x05
0x06
0x07
0x08
0x81
0x23
0x09
0x0A
Data
Diag.
0x007
0x000
0x006
0x004
0x053
0x144
0x000
Temp.
0x0C1
0xF38
12
0x0C
13
0x0D
14
0x0E
15
0x29
16
0xYZ
17
0x2A
18
0x2B
19
0x2C
20
0xYZ
22
0xYZ
23
0xYZ
ID
0x29
0x80
0x2A
0x2B
0x2C
0x81
21
0xYZ
0x90
0x91
Data
ID(6)
0x000
ID(6)
ID(6)
ID(6)
0x000
0x000
0x000
ID
0x29
0x80
0x2A
0x2B
0x2C
0x81
0x90
0x91
Data
ID(6)
0x000
ID(6)
ID(6)
ID(6)
0x000
0x000
0x000
ID
0x29
0x80
0x2A
0x2B
0x2C
0x81
0x90
0x91
Data
ID(6)
0x000
ID(6)
ID(6)
ID(6)
0x000
0x000
0x000
30
0xYZ
31
0xYZ
32
0xYZ
33
0xYZ
34
0x10
35
0xE1
Info
Enabled
Enabled
Enabled
24
0xYZ
25
0xYZ
26
0xYZ
27
0xYZ
28
0xYZ
29
0xYZ
ID
0x92
0x93
0x94
0x95
0x96
0x97
Data
0x000
0x000
0x000
0x000
0x000
0x000
Enabled
ID
0x92
0x93
0x94
0x95
0x96
0x97
Data
0x000
0x000
0x000
0x000
0x000
0x000
Enabled
ID
0x92
0x93
0x94
0x95
0x96
0x97
Data
0x000
0x000
0x000
0x000
0x000
0x000
Info
Enabled
11
0x0B
Table 16: Default configuration slow channel messages
6
The ID available in the data of slow channel messages 0x29 – 0x2C is a unique sensor ID
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18. Wrong Connections Overview
Table 17 provides an overview of the behavior of the MLX90818 when different combinations of connections to
GND, VDD and OUT are made.
GND
VDD
SENT out
Effect on output
0V
5V
Normal operation
Disconnected
5V
No communication
Normal operation
0V
Disconnected
No communication
Normal operation
0V
5V
SAE Standard
Load Circuit
SAE Standard
Load Circuit
SAE Standard
Load Circuit
Disconnected
Action after wrong
connection
Normal operation
No communication
Normal operation
0V
5V
0V
Normal operation
0V
5V
5V
0V
5V
18V
0V
0V
0V
18V
No communication
Normal operation
5V
5V
No communication
Normal operation
5V
0V
SAE Standard
Load Circuit
SAE Standard
Load Circuit
SAE Standard
Load Circuit
SAE Standard
Load Circuit
0V – No
communication
5V – No
communication
18V – No
communication
No communication
No communication
Normal operation
Normal operation
Normal operation
Normal operation
Table 17: Wrong connections overview
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Absolute Pressure Sensor
19. Diagnostics
19.1. Input Diagnostics
An overview of the different sensing element diagnostics conditions and their corresponding fast channel
mapping and diagnostic bit information in slow channel can be found in Table 18.
Condition
Sensing element supply disconnected
Sensing element GND disconnected
Sensing element P output disconnected
Sensing element N output disconnected
Sensing element supply shorted to GND
Sensing element P output shorted to GND
Sensing element N output shorted to GND
Sensing element P output shorted to Vbrg
Sensing element N output shorted to Vbrg
Fast Channel Code
4090
4090
4090
4090
4090
4090
4090
4090
4090
Error(7)
ERROR_SPSN
ERROR_SPSN
ERROR_PRESS_BROKEN_W
ERROR_PRESS_BROKEN_W
ERROR_SPSN
ERROR_SPSN
ERROR_SPSN
ERROR_SPSN
ERROR_SPSN
Table 18: Input diagnostics
19.2. Diagnostic Sources
The MLX90818 product has several internal checks which monitor the status of device. These checks or
diagnostic sources can be enabled or disabled based on the sensor module requirements. An overview of the
different diagnostic sources, their enable/disable parameter and the explanation of their functionality can
be found below in table Table 19.
Bit
10
9
8
7
6
5
4
3
2
1
0
Parameter
ERR_EN_TINT
ERR_EN_IO
ERR_EN_SPSN
ERR_EN_PV
ERR_EN_PP
ERR_EN_BW
ERR_EN_TMED
ERR_EN_VDIG
ERR_EN_VSUPH
ERR_EN_VSUPL
ERR_EN_TCHIP
Error condition
The Internal temperature could not be measured/calculated
RAM configuration error
SP or SN pin voltage out of range
The pressure value could not be measured/calculated
Pressure parameter error
A broken wire is detected in the pressure sensor path
The Medium temperature could not be measured/calculated
The digital voltage is out of range
The supply voltage is too high
The supply voltage is too low
The chip temperature out of range
Table 19: Diagnostic sources
7
See tables 21 to 23 for more information on the errors
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19.3. Fast and Slow Channel Diagnostics
There are two values reserved to show an error diagnostic mode in the fast channel. These values are 4090 and
4091. According to the type of diagnostic flag, one of the values will be transmitted if enabled. Internal errors like
for example PRESS_BROKEN_W or PRESS_PAR use 4090 to indicate an error condition on the fast channel.
Errors conditions which can be linked to external influences can be configured to either transmit 4090 or 4091.
These errors are VSUP_HIGH, VSUP_LOW, T_CHIP and VDIG.
For both VSUP_HIGH and VSUP_LOW fast channel overwriting using an error message can even be disabled. This
allows you to still decode properly the pressure or optionally temperature information in case of an over voltage
or under voltage condition. The OV or UV condition can still be monitored using the status bits for FC1 and FC2
and the slow channel diagnostic message MID01.
An overview of the fast channel error configuration can be found in Table 20. The EEPROM parameters V_ERR,
FCE_VSUP, FCE_VDIG and FCE_TCHIP handle this configuration.
Fast
Channel
ERR_VSUP
No change
4091
4090
Parameter
V_ERR
FCE_VSUP
0
Not applicable
1
0
1
1
Fast
Parameter
Channel
ERR_VDIG FCE_VDIG
4091
0
4090
1
Fast
Channel
ERR_TCH
4091
4090
Parameter
FCE_TCHIP
0
1
Table 20: Fast channel error configuration
The diagnostic slow channel message (MID 1) can be enabled or disabled independent of the other slow channel
messages and it has an adjustable repetition factor (2, 4, .., 30).
More information on the different diagnostics shown in SENT, their fast channel, slow channel and status bit
mapping can be found in the tables below.
REVISION 003 – 25 FEBRUARY 2019
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Page 27 of 37
MLX90818
Absolute Pressure Sensor
ERROR_ENABLE
parameter
FC_CFG = 0
FC_CFG = 1
FC_CFG = 2
FC_CFG = 3
ERROR
FC1
FC2
St[0]
St[1]
FC1
FC2
St[0]
St[1]
FC1
FC2
St[0]
St[1]
FC1
FC2
St[0]
St[1]
0
0
P
Tmed
0
0
P
Tint
0
0
N.A.
no error
P
~P
0
0
P
cnt &
~MSN(P)
-
not calibrated
4095
4095
1
1
4095
nc
1
nc
4095
4095
1
1
4095
4095
1
1
DIAG_INT
initialization error
4090
4090
1
1
4090
nc
1
nc
4090
4090
1
1
4090
4090
1
1
ERR_EN_TINT
T_INT
nc
nc
nc
nc
nc
nc
nc
nc
nc
nc
nc
nc
nc
4090
nc
1
ERR_EN_IO
RAM_IO_CFG
4090
4090
1
1
4090
nc
1
nc
4090
4090
1
1
4090
4090
1
1
ERR_EN_SPSN
SPSN
4090
4090
1
1
4090
nc
1
nc
4090
nc
1
nc
4090
nc
1
nc
ERR_EN_PV
PRESS
4090
4090
1
1
4090
nc
1
nc
4090
nc
1
nc
4090
nc
1
nc
ERR_EN_PP
PRESS_PAR
4090
4090
1
1
4090
nc
1
nc
4090
nc
1
nc
4090
nc
1
nc
ERR_EN_BW
PRESS_BROKEN_W
4090
4090
1
1
4090
nc
1
nc
4090
nc
1
nc
4090
nc
1
Nc
ERR_EN_TMED
T_MED
nc
nc
nc
nc
nc
nc
nc
nc
nc
4090
nc
1
nc
nc
nc
Nc
ERR_EN_VDIG
VDIG
ERR_VDIG
ERR_VDIG
1
1
ERR_VDIG
nc
1
nc
ERR_VDIG
ERR_VDIG
1
1
ERR_VDIG
ERR_VDIG
1
1
ERR_EN_TCHIP
T_CHIP
ERR_TCHIP
ERR_TCHIP
1
1
ERR_TCHIP
nc
1
nc
ERR_TCHIP
ERR_TCHIP
1
1
ERR_TCHIP
ERR_TCHIP
1
1
ERR_EN_VSUPH
VSUP_HIGH
ERR_VSUP
ERR_VSUP
1
1
ERR_VSUP
nc
1
nc
ERR_VSUP
ERR_VSUP
1
1
ERR_VSUP
ERR_VSUP
1
1
ERR_EN_VSUPL
VSUP_LOW
ERR_VSUP
ERR_VSUP
1
1
ERR_VSUP
nc
1
nc
ERR_VSUP
ERR_VSUP
1
1
ERR_VSUP
ERR_VSUP
1
1
DIAG_P1
P @ FC1 =
1
nc
1
nc
1
nc
1
nc
1
nc
1
nc
1
nc
1
Nc
DIAG_P1
P @ FC1 =
4088
nc
1
nc
4088
nc
1
nc
4088
nc
1
nc
4088
nc
1
Nc
DIAG_P2
P @ FC1 =
< Y1
nc
nc
nc
< Y1
nc
nc
nc
< Y1
nc
nc
nc
< Y1
nc
nc
Nc
DIAG_P2
P @ FC1 =
>Y2
nc
nc
nc
>Y2
nc
nc
nc
>Y2
nc
nc
nc
>Y2
nc
nc
Nc
DIAG_T1
T @ FC2 =
nc
1
nc
1
nc
1
nc
1
DIAG_T1
T @ FC2 =
nc
4088
nc
1
nc
4088
nc
1
DIAG_T2
T @ FC2 =
nc
=2266
nc
1
Table 21: Diagnostics in fast channel configuration 0 - 3
REVISION 003 – 25 FEBRUARY 2019
3901090818
Page 28 of 37
MLX90818
Absolute Pressure Sensor
ERROR_ENABLE
parameter
FC_CFG = 4
FC_CFG = 5
FC_CFG = 6
FC1
St[0]
FC1
St[0]
FC1
FC2
FC_CFG = 7
ERROR
St[0]
St[1]
FC1
St[0]
St[1]
N.A.
no error
P (3x 4b)
0
P (4x 3b)
0
[fc0_ptr]
[fc1_ptr]
0
0
P
0
0
0
-
not calibrated
4095
1
4095
1
nc
nc
nc
nc
4095
nc
1
nc
DIAG_INT
initialization error
4090
1
4090
1
nc
nc
nc
nc
4090
nc
1
nc
ERR_EN_TINT
T_INT
nc
nc
nc
nc
nc
nc
nc
nc
nc
nc
nc
nc
ERR_EN_IO
RAM_IO_CFG
4090
1
4090
1
nc
nc
nc
nc
4090
nc
1
nc
ERR_EN_SPSN
SPSN
4090
1
4090
1
nc
nc
nc
nc
4090
nc
1
nc
ERR_EN_PV
PRESS
4090
1
4090
1
nc
nc
nc
nc
4090
nc
1
nc
ERR_EN_PP
PRESS_PAR
4090
1
4090
1
nc
nc
nc
nc
4090
nc
1
nc
ERR_EN_BW
PRESS_BROKEN_W
4090
1
4090
1
nc
nc
nc
nc
4090
nc
1
nc
ERR_EN_TMED
T_MED
nc
nc
nc
nc
nc
nc
nc
nc
nc
nc
nc
nc
ERR_EN_VDIG
VDIG
ERR_VDIG
1
ERR_VDIG
1
nc
nc
nc
nc
ERR_VDIG
nc
1
nc
ERR_EN_TCHIP
T_CHIP
ERR_TCHIP
1
ERR_TCHIP
1
nc
nc
nc
nc
ERR_TCHIP
nc
1
nc
ERR_EN_VSUPH
VSUP_HIGH
ERR_VSUP
1
ERR_VSUP
1
nc
nc
nc
nc
ERR_VSUP
nc
1
nc
ERR_EN_VSUPL
VSUP_LOW
ERR_VSUP
1
ERR_VSUP
1
nc
nc
nc
nc
ERR_VSUP
nc
1
nc
DIAG_P1
P @ FC1 =
1
1
1
1
nc
nc
1
nc
1
nc
1
nc
DIAG_P1
P @ FC1 =
4088
1
4088
1
nc
nc
1
nc
4088
nc
1
nc
DIAG_P2
P @ FC1 =
< Y1
nc
< Y1
nc
nc
nc
nc
nc
< Y1
nc
nc
nc
DIAG_P2
P @ FC1 =
>Y2
nc
>Y2
nc
nc
nc
nc
nc
>Y2
nc
nc
nc
DIAG_T1
T @ FC2 =
nc
nc
nc
nc
DIAG_T1
T @ FC2 =
nc
nc
nc
nc
DIAG_T2
T @ FC2 =
nc
nc
nc
nc
DIAG_T2
T @ FC2 =
nc
nc
nc
nc
Table 22: Diagnostics in fast channel configuration 4 - 7
REVISION 003 – 25 FEBRUARY 2019
3901090818
FC2
Page 29 of 37
MLX90818
Absolute Pressure Sensor
ERROR_ENABLE
parameter
ERROR
N.A.
no error
-
not calibrated
DIAG_INT
initialization error
Slow channel diagnostic
000h
nc = no change
003h (only once when reinit passes after reset)
(Remark: in contrary to the other errors, DIAG_INT is used here to enable/disable the complete check and not only the
customized slow channel error reporting)
ERR_EN_TINT
T_INT
A05h if DIAG_INT=1, else set bit 11 & 10
ERR_EN_IO
RAM_IO_CFG
A05h if DIAG_INT=1, else set bit 11 & 9
ERR_EN_SPSN
SPSN
A05h if DIAG_INT=1, else set bit 11 & 8
ERR_EN_PV
PRESS
A05h if DIAG_INT=1, else set bit 11 & 7
ERR_EN_PP
PRESS_PAR
A05h if DIAG_INT=1, else set bit 11 & 6
ERR_EN_BW
PRESS_BROKEN_W
A05h if DIAG_INT=1, else set bit 11 & 5
ERR_EN_TMED
T_MED
A05h if DIAG_INT=1, else set bit 11 & 4
ERR_EN_VDIG
VDIG
A05h if DIAG_INT=1, else set bit 11 & 3
ERR_EN_TCHIP
T_CHIP
A05h if DIAG_INT=1, else set bit 11 & 0
ERR_EN_VSUPH
VSUP_HIGH
ERR_EN_VSUPL
VSUP_LOW
DIAG_P1
P @ FC1 =
002h if DIAG_PCL = 0 / 812h if DIAG_PCL = 1
DIAG_P1
P @ FC1 =
001h if DIAG_PCL = 0 / 811h if DIAG_PCL = 1
DIAG_P2
P @ FC1 =
002h
DIAG_P2
P @ FC1 =
001h
DIAG_T1
T @ FC2 =
005h
DIAG_T1
T @ FC2 =
004h
DIAG_T2
T @ FC2 =
805h (Remark: value 186 matches with -50 degC)
DIAG_T2
T @ FC2 =
804h (Remark: value 2266 matches with +210 degC)
021h / 901h if DIAG_VSUP = 0 / 1, but set bit 11 & 2 if also other errors are reported in the fast channel
and if DIAG_INT=0 (if DIAG_INT=1 and other errors, then A05h)
020h / 900h if DIAG_VSUP = 0 / 1, but set bit 11 & 1 if also other errors are reported in the fast channel
and if DIAG_INT=0 (if DIAG_INT=1 and other errors, then A05h)
Table 23: Diagnostics in slow channel
REVISION 003 – 25 FEBRUARY 2019
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Page 30 of 37
MLX90818
Absolute Pressure Sensor
Multiple diagnostic errors can be flagged in the range 8xxh – FFFh in case parameter DIAG_INT is set to 0.
The level of the over and under voltage diagnostics can be configured according to the ranges described in Table
24.
Parameter
Under voltage detection
threshold range
Overvoltage detection
threshold range
Over-/Under-voltage
detection accuracy
Min
Max
Units
3.25
5.74
V
4.25
6.74
V
200
mV
Comment
Optional and Programmable
with 8 bits in parameter
VSUP_LOW
Optional and
Programmable with 8 bits in
parameter VSUP_HIGH
Table 24: MLX90818 under and overvoltage detection
The default configuration for diagnostics on the different option codes can be found in Table 25 below.
EEPROM Parameter
ERR_EN_TINT
ERR_EN_IO
ERR_EN_SPSN
ERR_EN_PV
ERR_EN_PP
ERR_EN_BW
ERR_EN_TMED
ERR_EN_VDIG
ERR_EN_VSUPH
ERR_EN_VSUPL
ERR_EN_TCHIP
FCE_VDIG
FCE_TCHIP
DIAG_PCL
DIAG_INT
V_ERR
FCE_VSUP
DIAG_VSUP
DIAG_P2
DIAG_P1
DIAG_T2
DIAG_T1
BBG-015
1
1
1
1
1
1
0
1
0
1 (4V)
1
1
1
0
1
0
1
1
1
1
0
0
BBG-016
1
1
1
1
1
1
1
1
0
1 (4.5V)
1
1
1
1
1
0
1
1
0
1
0
1
BBG-017
1
1
1
1
1
1
1
1
0
1 (4.5V)
1
1
1
1
1
0
1
1
0
1
0
1
Table 25: Default diagnostic configurations
REVISION 003 – 25 FEBRUARY 2019
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Page 31 of 37
MLX90818
Absolute Pressure Sensor
20. Timings
Parameter
SENT frame period
Symbol
tframe
Start-up time
(to first falling edge)
Start-up time
(up to first data
received)
tsu1
tsu2
Comment
Shortest message (without pause
pulse) and longest message
(pause pulse enabled).
Example in µs calculated using a
3µs tick time.
Based on default settings.
Min
154
462
Typ
0.7
1
First SENT frame contains valid
pressure data. Calculation based
on 3µs tick time.
Max
282
846(8)
Unit
ticks
µs
1.1
ms
1.946(8)
ms
Table 26: Start-up timings
tsu2
tsu1
OUT
tframe
Data
Data
Data
VDD
Figure 12: Start-up timings
8
Using nominal tick time, excluding tick time variations.
REVISION 003 – 25 FEBRUARY 2019
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Page 32 of 37
MLX90818
Absolute Pressure Sensor
21. Application Information
Application schematic using the NTC input
OUT
MLX90818
NTC
VDD
2.2nF
10nF
100nF
GND
Figure 13: Basic application schematic using NTC
Application schematic not using the NTC input
OUT
MLX90818
VDD
2.2nF
100nF
GND
Figure 14: Basic application schematic without NTC
These recommendations for external components are only providing a basic protection. Depending on the
module design and the EMC speciation requirements different configurations can be needed.
REVISION 003 – 25 FEBRUARY 2019
3901090818
Page 33 of 37
MLX90818
Absolute Pressure Sensor
22. 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.aspx
23. ESD Precautions
Electronic semiconductor products are sensitive to Electro Static Discharge (ESD).
Always observe Electro Static Discharge control procedures whenever handling semiconductor products.
REVISION 003 – 25 FEBRUARY 2019
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Page 34 of 37
MLX90818
Absolute Pressure Sensor
24. Package Information
Figure 15: MLX90818 package drawing
REVISION 003 – 25 FEBRUARY 2019
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Page 35 of 37
MLX90818
Absolute Pressure Sensor
25. PCB Land Pattern Recommendation
Figure 16: PCB Land Pattern
REVISION 003 – 25 FEBRUARY 2019
3901090818
Page 36 of 37
MLX90818
Absolute Pressure Sensor
26. Contact
For the latest version of this document, go to our website at www.melexis.com.
For additional information, please contact our Direct Sales team and get help for your specific needs:
Europe, Africa
Telephone: +32 13 67 04 95
Email : sales_europe@melexis.com
Americas
Telephone: +1 603 223 2362
Email : sales_usa@melexis.com
Asia
Email : sales_asia@melexis.com
27. Disclaimer
The information furnished by Melexis herein (“Information”) is believed to be correct and accurate. Melexis disclaims (i) any and all liability in connection with or arising out of the
furnishing, performance or use of the technical data or use of the product(s) as described herein (“Product”) (ii) any and al l liability, including without limitation, special,
consequential or incidental damages, and (iii) any and all warranties, express, statutory, implied, or by description, including warranties of fitness for particular purpose, noninfringement and merchantability. No obligation or liability shall arise or flow out of Melexis’ rendering of technical or other services.
The Information is provided "as is” and Melexis reserves the right to change the Information at any time and without notice. Therefore, before placing orders and/or prior to
designing the Product into a system, users or any third party should obtain the latest version of the relevant information to verify that the information being relied upon is current.
Users or any third party must further determine the suitability of the Product for its application, including the level of reliability required and determine whether it is fit for a
particular purpose.
The Information is proprietary and/or confidential information of Melexis and the use thereof or anything described by the In formation does not grant, explicitly or implicitly, to
any party any patent rights, licenses, or any other intellectual property rights.
This document as well as the Product(s) may be subject to export control regulations. Please be aware that export might require a prior authorization from competent authorities.
The Product(s) are intended for use in normal commercial applications. Unless otherwise agreed upon in writing, the Product(s) are not designed, author ized or warranted to be
suitable in applications requiring extended temperature range and/or unusual environmental requirements. High reliability applications, such as medical life-support or lifesustaining equipment are specifically not recommended by Melexis.
The Product(s) may not be used for the following applications subject to export control regulations: the development, produ ction, processing, operation, maintenance, storage,
recognition or proliferation of 1) chemical, biological or nuclear weapons, or for the development, production, maintenance o r storage of missiles for such weapons: 2) civil
firearms, including spare parts or ammunition for such arms; 3) defense related products, or other material for military use or for law enforcement; 4) any applications that, alone
or in combination with other goods, substances or organisms could cause serious harm to persons or goods and that can be used as a means of violence in an armed conflict or any
similar violent situation.
The Products sold by Melexis are subject to the terms and conditions as specified in the Terms of Sale, which can be found at https://www.melexis.com/en/legal/terms-andconditions.
This document supersedes and replaces all prior information regarding the Product(s) and/or previous versions of this document.
Melexis NV © - No part of this document may be reproduced without the prior written consent of Melexis. (2016)
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REVISION 003 – 25 FEBRUARY 2019
3901090818
Page 37 of 37
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