BMD040-3MP - Bosch Sensortec

Data sheet

BMD040

Bosch Sensortec

Rev. 1.3 Page 1 - proprietary information 23 October 2008

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BMD040 Data sheet

Order code 0 273 300 139

Package type TO-8

Data sheet version 1.3

Release date 23 October 2008

Document number BST-BMD040-DS000-03

Notes Specification subject to change without notice. Proprietary information, not

intended for publication. Product photos and pictures are for illustration

purposes only and may differ from the real product’s appearance.

BMD040

Analog pressure sensor

Data sheet

BMD040

Bosch Sensortec

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BMD040 - High precision 3MPa absolute pressure sensor

Key feature s

• High precision barometric pressure sensor

• Pressure range: 50 … 3,000kPa

• TO-8 metal can package

• Fully calibrated

• Temperature compensated

• Fast ratiometric analog output technology

• ESD-protection and short circuit protected

• Inverse polarity protected up to 300mA supply current and

on board diagnosis capability due to high driver output

• Temperature range -30 ... +100°C

• RoHS-compliant

Typical applications

• HVAC (heating, ventilation, air-conditioning)

• Fuel pressure measurement

• Air pressure measurement

• Hydraulic pressure measurement

General description

The BMD040 analog output, absolute pressure sensor comprises a piezo-resistive pressure

sensor element and a circuitry for signal amplification and temperature compensation. Both

components are integrated on a single silicon chip. The active surface of the silicon chip is

exposed to a reference vacuum that is formed by an evacuated TO-type housing. The medium

to be measured is led up by a pressure nozzle to the back side of the diaphragm, which is

resistant to most of the measured media.

Data sheet

BMD040

Bosch Sensortec

Rev. 1.3 Page 3 - proprietary information 23 October 2008

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Table of contents

1 DATA..................................................................................................................................... 4

1.1 MAXIMUM RATINGS OF PRESSURE SENSOR......................................................................... 4

1.2 OPERATING CHARACTERISTICS OF PRESSURE SENSOR....................................................... 4

1.3 SIGNAL EVALUATION.......................................................................................................... 5

1.4 SIGNAL RANGE CHECK....................................................................................................... 5

1.5 TRANSFER FUNCTION OF PRESSURE SENSOR..................................................................... 6

1.6 ACCURACY OF PRESSURE SENSOR .................................................................................... 7

1.7 DATA OF CLK PIN ............................................................................................................ 8

1.8 TYPICAL TEMPERATURE DEPENDENCE OF CLK-PIN (SCHEMATIC)....................................... 8

2 INSTALLATION INSTRUCTIONS......................................................................................... 9

3 ASSEMBLY INSTALLATION.............................................................................................. 10

4 MAXIMUM STORAGE TIME............................................................................................... 11

5 PIN ASSIGNMENT.............................................................................................................. 12

6 PACKAGE........................................................................................................................... 13

7 LEGAL DISCLAIMER ......................................................................................................... 14

7.1 PRODUCT USE ................................................................................................................ 14

7.2 ENGINEERING SAMPLES................................................................................................... 14

7.3 APPLICATION EXAMPLES AND HINTS ................................................................................. 14

8 DOCUMENT HISTORY AND MODIFICATION................................................................... 15

Data sheet

BMD040

Bosch Sensortec

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1 Data

(valid for BMD040 only, not for module)

1.1 Maximum ratings of pressure sensor

Parameter Condition Value Unit Max. time

Supply Voltage US,max. 16 V 1 min

Pressure (burst pressure) pabs,max. 9000 kPa 1 min

Proven pressure P_prov 4500 kPa 1 min.

Temperature t -40/+130 °C 100 h

Storage Temperature T -30/+120 °C < 6 weeks

The output is resistant to short circuit to 0 V respectively 5 V. The sensor is resistant to

reverse voltage for 5 min at room temperature, as the maximum current is limited to 0.3 A.

1.2 Operating characteristics of pressure sensor

Parameter Symbol Value Unit

min. typ. max.

Pressure range pabs 50 3000 kPa

Temperature range t -30 100 °C

Supply voltage US 4.75 5.0 5.25 V

Supply current at U S = 5 V lS 6.0 9.0 12.5 mA

Output load current lL -1.0 0.5 mA

Load resistance to US

or to ground Rpull-up

Rpull-down 5.0

10.0 kΩ

kΩ

Load capacitance CL 12 nF

Response time T10/90 1.0 ms

Lower limit at US = 5 V Uout,min. 0.25 0.3 0.35 V

Upper limit at US = 5 V Uout,max. 4.65 4.7 4.75 V

Output resistance to ground, US

open 1) Rlo 2.4 4.7 8.2 kΩ

Output resistance to US, ground

open 1) Rhi 3.4 5.3 8.2 kΩ

1) valid only for measuring voltage < 0.5V

Data sheet

BMD040

Bosch Sensortec

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1.3 Signal evaluation

The pressure sensor supplies an analogue output signal, which is ratiometric to the supply

voltage. An RC low-pass filter with for instance τ = 2ms is recommended as an input circuitry for

the following electronics in order to suppress possibly disturbing harmonic vibrations.

The output voltage of the CLK PIN (to be measured using a high input impedance > 2MΩ, e.g.

buffer with subsequent filtering) is decreasing with increasing temperature.

Proper signal evaluation is performed by applying 10nF capacitors between VDD and GND and

between OUT and GND. Maximum total capacitive load on the OUT-pin must be below 25nF

(including the 10nF mentioned before).

1.4 Signal range check

The electric output of the sensor is designed in such a way, that failures in function by cable

breaks or short circuits can be detected by a suitable input circuitry of the following electronics.

For the signal range check the diagnosis ranges beyond the characteristic limits are provided.

Example of circuitry for detection of several kinds of failures by signal out of characteristic limits:

Figure 1. Application note (example)

Buffer &

filter

CLK

Data sheet

BMD040

Bosch Sensortec

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1.5 Transfer function of pressure sensor

Uout = (c1* pabs + c0) * US

where Uout = signal output voltage in V

S = supply voltage in V

abs = absolute pressure in kPa

0 = 0.0864407

1 = 0.0002712

Figure 2. Characteristics at US = 5.000 V (schematic view)

3000

Data sheet

BMD040

Bosch Sensortec

Rev. 1.3 Page 7 - proprietary information 23 October 2008

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1.6 Accuracy of pressure sensor

Figure 3. Characteristic tolerance (2s values)

Figure 4. Tolerance broadening as a function of temperature (schematic view)

100

1,0

1,38

-30 70

Factor

Temperature [°C]

3000

120

-90

-120

50 2000

Absolute pressure [kPa]

Tolerance

[kPa]

Data sheet

BMD040

Bosch Sensortec

Rev. 1.3 Page 8 - proprietary information 23 October 2008

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Including all temperature and pressure tolerances a total tolerance over the whole

temperature and pressure range of in total ±4,75% as 2s-value has to be taken into

account.

1.7 Data of CLK PIN

• UCLK is 4 times threshold voltage of one diode without additional measures for

temperature compensation, linearization, etc.

• UCLK gives an indication about temperature dependence

• Measurement of UCLK should be using a high ohmic impedance (e. g. buffer),

subsequent filtering is recommended

1.8 Typical temperature dependence of CLK-PIN (schematic)

Figure 5. Characteristic UCLK = f(t), typical behaviour

• Typical dependence of output voltage is approximately -8mV/K

• Typical output voltage range of CLK pin at room temperature is 2.6V to 3.0V

temperature

UCLK

Data sheet

BMD040

Bosch Sensortec

Rev. 1.3 Page 9 - proprietary information 23 October 2008

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2 Installation instructions

The sensor is designed for attachment to a plane surface. The pressure nozzle might be sealed

in some applications by an O-ring and might be fixed to a PCB or something similar. The hole in

the fixture on customer side and the fastening must be designed in accordance to the offer

drawing so that a long-term, leak proof seal at the port to the measured medium are guaranteed

(if leakage is required).

The recommended installation position is pressure port inclined downwards, installation only on

clean side. Potentially freezing media and condensate are not allowed to accumulate at the

pressure port and may not be introduced on transport and assembly either.

In the interest of good continuity on the connectors, it is essential that not only the connector on

the component side is according to specification, but that the material quality and exact fit of a

cable harness connector (if such one is used) or another connector are also guaranteed. Any

connector should therefore be according to the Bosch Sensortec offer drawing specification.

When mounting the BMD040 to a printed circuit board (PCB) special care has to be taken in

order to stay below a certain temperature budget during the soldering process. For further

details on the recommended soldering conditions for the BMD040, please contact Bosch

Sensortec.

Data sheet

BMD040

Bosch Sensortec

Rev. 1.3 Page 10 - proprietary information 23 October 2008

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Specification is subject to chan

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3 Assembly installation

In order to avoid deterioration or pre-damage of the sensor at the user following points have to

be absolutely noticed:

a) It has to be ensured that the O-ring (if an O-ring is used) will not be damaged at assembly.

Only a thin film of ‘Shell Ondina Oil 68’ or light engine oil (5W20) may be applied as

lubricant. Don't use silicone based lubricants.

b) The sensor must not be mounted with striking tools (e.g. hammer). The maximum allowed

force at the pins is 10N. In order to avoid leakage through the glass isolation around the

pins, use as low as possible forces.

c) When the assembly unit is exposed to a leakage test, don't exceed maximum overpressure.

d) At immersion test plug connector and pressure port for protection against water ingress.

e) Avoid reverse voltage and over-voltage when electrical tests are applied to the sensor.

f) It is recommended to keep the distance between the TO-8-bottom plate and the PCB at

approximately 1.8 … 2.0mm (see figure 7 and figure 8), which is the thickness of the square

metal part at the bottom plate. This part is holding the pressure pipe. This mounting

condition prevents possible shortcuts between the electrical connections (TO-8 housing is

connected to GND).

g) It has to be ensured, that pressure is only applied via the pressure pipe, since above a

certain pressure, the metal cap will start to bend. This critical pressure level is slightly above

the full scale pressure range.

h) The sensor is sensitive to temperatures above 170°C, thus temperatures above this value

at the TO8-cell (not at the pins) must be avoided.

As a consequence:

(1) Reflow soldering of the sensor is forbidden, since too high temperatures may

occur. By using hand or dip soldering of the pins the temperature at the pins

may exceed 170°C, but not in the inner part of the sensor. For checking the

temperature of the housing, a thermo couple or temperature probe could be

used.

(2) The pressure of the measured media has to be applied via the pressure pipe.

Thus this pressure pipe has to be connected to the device (e. g. an air-

conditioner) without leakage. This could be done by using an O-ring or laser

welding or soldering. Depending on the pressure range some methods are not

feasible (e. g. O-Ring for 30 bar applications). If laser welding or soldering is

used, the same temperature restriction is valid as described in (1), but in this

case the pressure pipe is introducing the temperature.

(3) A dedicated assessment of the influence of the implementation method (O-

Ring, soldering, welding, etc.) could be done together with Bosch Sensortec in

order to ensure proper assembly and to avoid damage of the sensor.

If the installation of the sensor takes place at the supplier e.g. of an assembly unit, the supplier

has to be instructed accordingly.

If the pressure sensor is removed after field use from the interface of an assembly unit e.g. rail,

the sensor has to be replaced by a new sensor to guarantee tightness.

Data sheet

BMD040

Bosch Sensortec

Rev. 1.3 Page 11 - proprietary information 23 October 2008

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4 Maximum storage time

Maximum storage time: 3 years

Storage temperature: 0 ... 40°C

Relative humidity: 40... 60%

Short-term exceeding of storage conditions is possible (see maximum ratings).

Protecting against external effect (i.e. precipitation, vapor)

Data sheet

BMD040

Bosch Sensortec

Rev. 1.3 Page 12 - proprietary information 23 October 2008

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5 Pin assignment

A = supply (+5 V)

B = ground (contacted to TO-8 can)

C = pressure output

CLK = temperature output, high impedance, can be connected to ground if not used

UP1 = programming pin, can be connected to ground

UP2 = programming pin, can be connected to ground

Figure 6: Pin assignment – view from above

Data sheet

BMD040

Bosch Sensortec

Rev. 1.3 Page 13 - proprietary information 23 October 2008

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6 Package

Figure 7: Package dimensions (all in mm), type writing is in the hatched area

Figure 8: Pressure supply pipe with tolerance data (all in mm)

Data sheet

BMD040

Bosch Sensortec

Rev. 1.3 Page 14 - proprietary information 23 October 2008

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7 Legal disclaimer

7.1 Product use

Bosch Sensortec products are developed for the consumer goods industry. They may only be

used within the parameters of this product data sheet. Bosch Sensortec products are provided

with the express understanding that there is no warranty of fitness for a particular purpose. They

are not fit for use in life-sustaining, safety or security sensitive systems or any system or device

that may lead to bodily harm or property damage if the system or device malfunctions. In

addition, Bosch Sensortec products are not fit for use in products which interact with motor

vehicle systems.

The resale and/or use of products are at the purchaser’s own risk and his own responsibility.

The examination of fitness for the intended use is the sole responsibility of the Purchaser.

The purchaser shall indemnify Bosch Sensortec from all third party claims, including any claims

for incidental, or consequential damages, arising from any product use not covered by the

parameters of the respective valid product data sheet or not approved by Bosch Sensortec and

reimburse Bosch Sensortec for all costs in connection with such claims.

The purchaser must monitor the market for the purchased products, particularly with regard to

product safety and inform Bosch Sensortec without delay of all security relevant incidents.

7.2 Engineering samples

Engineering Samples are marked with an asterisk (*) or (e). Samples may vary from the valid

technical specifications of the product series contained in this data sheet. They are therefore not

intended or fit for resale to third parties or for use in end products. Their sole purpose is internal

client testing. The testing of an engineering sample may in no way replace the testing of a

product series. Bosch Sensortec assumes no liability for the use of engineering samples. By

accepting the engineering samples, the Purchaser agrees to indemnify Bosch Sensortec from

all claims arising from the use of engineering samples.

7.3 Application examples and hints

With respect to any examples or hints given herein, any typical values stated herein and/or any

information regarding the application of the device, Bosch Sensortec hereby disclaims any and

all warranties and liabilities of any kind, including without limitation warranties of non-

infringement of intellectual property rights or copyrights of any third party. The information given

in this document shall in no event be regarded as a guarantee of conditions or characteristics.

They are provided for illustrative purposes only and no evaluation regarding infringement of

intellectual property rights or copyrights or regarding functionality, performance or error has

been made.

Data sheet

BMD040

Bosch Sensortec

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8 Document history and modification

Rev. No Chapter Description of modification/changes Date

1.0 Initial version 05-June-07

1.1 Title Introduced part number 26-Oct-2007

1.6 Added some comments on tolerance values 26-Oct-2007

1.2 3 Modified and added assembly recommendations 03-Dec-2007

7 Update of legal disclaimer 03-Dec-2007

1 Added storage temp, increase temp.-range 16-Jan-2008

1.3 1.3 Added info on external 10nF capacitors 23-Oct-2008

Bosch Sensortec GmbH

Gerhard-Kindler-Strasse 8

72770 Reutlingen / Germany

contact@bosch-sensortec.com

www.bosch-sensortec.com

Modifications reserved | Printed in Germany

Specifications subject to change without notice

Document-number: BST-BMD040-DS000-03

Version_1.3_102008