MLX90215LVA-BC03 - Melexis Technologies NV

MLX90215

Precision Programmable

Linear Hall Effect Sensor

3901090215 Page 1 9/09/03

Rev 007

Description

The MLX90215 is a Programmable Linear Hall Effect

sensor IC fabricated utilizing silicon-CMOS technology.

It possesses active error correction circuitry which

virtually eliminates the offset errors normally associated

with analog Hall Effect devices. All magnetic response

functions of the MLX90215 are fully programmable for

even greater versatility. The V

OQ (VOUT@ B=0),

sensitivity, direction of slope and the magnitude of

sensitivity drift over temperature, are all programmable.

The ratiometric output voltage is proportional to the

supply voltage. When using the supply voltage as a

reference for an A/D converter, fluctuations of ±10% in

supply voltage will not affect accuracy. When

programmed for a conventional sensitivity (with a

positive gain), the voltage at the output will increase as

a South magnetic field is applied to the branded face of

the MLX90215. Conversely, the voltage output will

decrease in the presence of a North magnetic field. The

MLX90215 has a sensitivity drift of less than +1%

error, and VOQ stability drift of less than +0.4% error,

over a broad temperature range.

Functional Diagram

Features and Benefits

• Programmable Linear Hall IC

• Quad Switched / Chopper Stabilized

• Ratiometric Output for A/D Interface

• Adjustable Quiescent Voltage (VOQ )

• Very Low Quiescent Voltage Temperature Drift

• Adjustable Sensitivity

• Adjustable Temperature Compensation of Sensitivity

Applications

• Linear Position Sensing

• Rotary Position Sensing

• Current Sensing

Ordering Information

Part No. Temperature Suffix Package

MLX90215 L (-40oC to 150oC) VA(4 Lead SIP)

MLX90215 E (-40oC to 85oC) VA(4 Lead SIP)

Chopper

Shift Register (RAM)

OTPROM (ROM)

Program

Decoder

DAC

Hall Plate

Pin 1 - VDD (Supply)

Pin 2 - Test/Readback Enable

Pin 3 - VSS (Ground)

Pin 4 - Output

Note: Static sensitive device, please observe ESD precautions.

3901090215 Page 2 9/09/03

Rev 007

MLX90215

Precision Programmable

Linear Hall Effect Sensor

Parameter Symbol Test Conditions Min Typ Max Units

Supply Voltage VDD Operating 4.5 5.0 5.5 V

Supply Current IDD B = 0, VDD = 5V, IOUT = 0 2.5 4.0 6.5 mA

Output Current (1) IOUT VDD = 5V + 10% -2 - 2 mA

Quiescent Output Voltage (2) VOQ 10-Bit Programmable, B = 0 0.5 - 4.5 V

Output Voltage (1) VOH VDD = 5V, IOUT = -2mA 4.50 4.65 V

Bandwidth (3) BW RoughGain @ Min - 1.300 kHz

Bandwidth (3) BW RoughGain @ Max 0.130 - kHz

Step Response Time (6) TRMIN RoughGain @ Min 25 - µs

Step Response Time (6) TRMIN RoughGain @ Max 250 µs

Offset Voltage Adjustment

Resolution ∆VOQ B = 0, TA = 25oC , 1/2 Vdd = 1

B = 0, TA = 25oC , 1/2 Vdd = 0 -1.5

-6.0 - 1.5

6.0 mV

Offset Voltage Drift

over Temperature ∆VOQ/∆T B = 0, TA = -40oC to 150oC

S < 100mV/mT & VOQ > 0.75V -20 - 20 mV

Offset Voltage Drift (2)

over Temperature ∆VOQ/∆T B = 0, TA = -40oC to 150oC

S > 100mV/mT & VOQ < 0.75V -40 - 40 mV

Range of Sensitivity (7) s 13-Bit Programmable 5 - 140 mV/mT

Peak to Peak Noise (4) 8 25 60 mV

Output Resistance ROUT 6 Ω

Sensitivity Drift(5) TA = 25oC -1 - 1 %

MLX90215 Electrical Specifications

DC Operating Parameters TA = -40oC to 150oC, VDD = 5.0V (Unless otherwise specified)

Output Voltage (1) VOL VDD = 5V, IOUT = 2mA 0.35 0.50 V

Sampling Rate fSAMP RoughGain @ Max and Min 4 - 40 kHz

Melexis Inc. reserves the right to make changes without further notice to any products herein to improve reliability, function, or design. Melexis does not

assume any liability arising from the use of any product or application of any product or circuit described herein.

Notes:

(1) If output current and voltage specifications are exceeded, linearity will be degraded.

(2) If VOQ is programmed beyond these limits, the temperature compensation may become a problem at high

temperatures. It is not recommended to program values of VOQ below 1V or above 4V when sensitivity exceeds 100

mV/mT. Temperature instability can occur on some devices under these conditions.

(3) Bandwidth is related to the sample rate and ROUGHGAIN. Bandwidth is estimated by (sample rate / 30)

(4) Peak to Peak Noise is a function of ROUGHGAIN setting. See page 5, Peak to Peak Noise versus Sensitivity.

(5) Sensitivity drift is independent of other parameters and does not include individual tolerances (∆VOQ or ∆VOQ/∆T).

The tolerance for sensitivity ±1% of its initial value. This does not include tolerance stack-up.

(6) If the step input occurs in the middle of a sample interval, the small signal response delay will double. For

ROUGHGAIN values less than or equal to 3, response time may be limited by the slew rate.

(7) 1 mT = 10 Gauss

MLX90215

Precision Programmable

Linear Hall Effect Sensor

3901090215 Page 3 9/09/03

Rev 007

How does it Work?

The MLX90215 programming is done through the

output pin, by changing supply voltage levels. Please

note that the VDD is raised to approximately 13V and

18V during programming. Any connected components

must also tolerate this voltage excursion. When the

supply voltage is at 4.5V to 5.5V, the output behaves

normally. If the supply voltage is raised to 13V, the

output then behaves as an input, or LOAD mode,

allowing the 37-bit word to be clocked in. All data is

loaded through a single line, with no dedicated clock

signal. Clock and data are integrated into one signal

which is initiated with the beginning of the LOAD

sequence, then clocked with the positive edge of each

bit. Variables are changed with the PC software and

loaded into the temporary register of the device (RAM)

via the timings of the programmer’s microcontroller.

Data can be loaded as many times as desired while in

LOAD mode. Once a word is loaded, results are

checked by observing the output voltage. This can be

done with an external Voltmeter attached directly to pin

4 of the device, or with the internal ADC of the

programmer. Once the desired program is loaded, the

word can be “Zapped” permanently into ROM.

This is done when the supply voltage rises above 18V,

or ZAP mode, creating enough current to “Zap” 31

zener diodes which correspond to the temporary

cannot be erased.

The above description is only for reference. The voltage

levels and data transfer rates are completely controlled

by the ASIC programmer. For more information on the

programmer hardware, contact Melexis and request a

datasheet for the SDAP programmer.

Programming The Quiescent Offset Voltage (VOQ)10

bits, 1024 steps of resolution, are allotted to adjust the

Quiescent Offset Voltage (VOQ). By utilizing the

HALFVDD function, the VOQ can be set to one of two

ranges. With the HALFVDD function disabled, the VOQ

can be programmed within a range of 10% to 90% VDD

with about 5mV per step resolution. With the

HALFVDD function enabled, the device may be

programmed within a 2V to 3V window with less than

1mV per step resolution

Programming the Sensitivity (Gain)

The sensitivity is programmed with a ROUGHGAIN

and a FINEGAIN adjustment. The ROUGHGAIN is

adjusted by utilizing three bits, or 8 increments. The

FINEGAIN is programmed with 10 bits or 1024

increments. The sensitivity can be programmed within a

range of 5mV/mT to 140mV/mT. Another 1-bit function

allows the direction of the sensitivity to be reversed.

The INVERTSLOPE function, when activated, will

cause the Voltage output of the MLX90215 to decrease

in the presence of a South magnetic field, and to

increase in the presence of a North magnetic field. Table

2 expresses examples of sensitivity resulting from

programming ROUGH GAIN and FINE GAIN codes,

with the INVERT SLOPE function turned off.

Note: Tables 1 and 2 are examples how various codes affect the device.

Output voltage will vary slightly from device to device. Use these tables

for reference only.

UnitsHalfVDD OffsetDAC Output

512

1023

512

1023

4.97

2.47

0.03

3.07

2.45

1.83

Table 1 - Programming Offset Voltage (V

)

RoughGain FineGain Output Units

1023

4.1

9.4

6.2

14.6

9.5

22.4

mV/mT

Table 2 - Programming Sensitivity

mV/mT

1023

14.2

33.1

21.5

50.4

31.3

72.5

mV/mT

46.2

107

mV/mT

68.9

140

mV/mT

1023

3901090215 Page 4 9/09/03

Rev 007

MLX90215

Precision Programmable

Linear Hall Effect Sensor

Programming the Temperature Compensation

The MLX90215 has a 5-bit (32 step) programmable

adjustment that changes it’s sensitivity drift over a given

temperature range. By adjusting the TC code the

sensitivity can be programmed to increase as

temperature increases to counteract the decrease in

magnetic flux most magnets display over temperature.

For example a SmCo (Samarium Cobalt) magnet has a

temperature coefficient of approximately -300 ppm/oC.

The MLX90215 can be programmed with a TC of 300

ppm/oC to counteract the TC of the magnet and greatly

improve linearity in the application over temperature.

Table 3 (left) illustrates the way the TC code affects the

sensitivity temperature drift. Also note in Table 3, the

overlap in TC codes. The numbers in the table represent

typical results and are for reference only. For accurate

results the TC code must be determined experimentally.

This TC code map applies to MLX90215’s with a first

line brand showing “215DB”

Special Note

The MLX90215 programmed with a zero TC code

(default) has a typical TC value between the range of –

300 to –600 ppm/oC. This means sensitivity will

decrease slightly as temperature increases. The slightly

negative initial TC value allows the MLX90215 to be

accurately programmed up to 0 TC. Almost all magnets

have a naturally negative TC code. The natural TC of a

magnet added with the initial negative TC value of the

MLX90215 could degrade linearity over a large

temperature span. Using a TC code of 6, 7, or 8 will

give the MLX90215 a slightly positive TC code.

Previous revisions of the MLX90215 with second line

brand of “15AXX” or “15DXX” should refer to factory

for TC code maps.

Diagnostic Characteristics

TC Code Min Typical Max Units

0 -700 -550 -350 ppm/oC

1 -625 -450 -275 ppm/oC

2 -525 -375 -175 ppm/oC

3 -450 -300 -100 ppm/oC

4 -350 -200 -25 ppm/oC

5 -275 -125 50 ppm/oC

6 -200 -50 125 ppm/oC

7 -100 25 225 ppm/oC

8 125 275 425 ppm/oC

9 225 350 525 ppm/oC

10 300 425 600 ppm/oC

11 375 525 700 ppm/oC

12 450 600 775 ppm/oC

13 525 675 850 ppm/oC

14 600 775 950 ppm/oC

15 675 850 1025 ppm/oC

16 975 1300 1550 ppm/oC

17 1025 1375 1650 ppm/oC

18 1125 1470 1750 ppm/oC

19 1200 1550 1825 ppm/oC

20 1275 1650 1950 ppm/oC

21 1325 1725 2025 ppm/oC

22 1425 1800 2125 ppm/oC

23 1475 1900 2200 ppm/oC

24 1500 2000 2425 ppm/oC

25 1550 2100 2525 ppm/oC

26 1600 2200 2625 ppm/oC

27 1675 2275 2700 ppm/oC

28 1750 2375 2825 ppm/oC

29 1825 2450 2925 ppm/oC

30 1900 2550 3025 ppm/oC

31 1950 2650 3125 ppm/oC

Table 3 - Temperature Compensation

Condition Output Level

VOUT Shorted to VDD VOUT = VDD

VOUT Shorted to VSS VOUT = VSS

VOUT open with pull up load VOUT = VDD

VOUT open with pull down load VOUT = VSS

VSS open with pull up load VOUT = VDD

VSS open with pull down load

> 10 K Ohms VOUT = VDD

or 94% VDD

VDD open with pull up load

> 4.7 K Ohms VOUT = VSS

or 3% VDD

VDD open with pull down load VOUT = VSS

Temperature Compensation

Temperature compensation (TC) is defined as the

change in sensitivity over temperature. Expressed in

(Parts Per Million per Degree Celcius) ppm/oC.

SensT1 = Sensitivity measured at Temperature 1 (T1)

SensT2 = Sensitivity measured at Temperature 2 (T2)

Sens25 = Initial Sensitivity measured at 25oC

ppm

TTSensSensSens

TC o

TT 6

21 10

21 1∗

−

∗

−

MLX90215

Precision Programmable

Linear Hall Effect Sensor

3901090215 Page 5 9/09/03

Rev 007

-6

-12

-18

Output Voltage (V)

Flux Density (mT)

Typical Output Voltage versus

Magnetic Flux Density

Sensitivity = 140mV/mT

MLX90215

-90

-180

-270

180

270

Output Voltage (V)

Flux Density (mT)

Typical Output Voltage versus

Magnetic Flux Density

Sensitivity = 10mV/mT

MLX90215

MLX90215 Performance

3901090215 Page 6 9/09/03

Rev 007

MLX90215

Precision Programmable

Linear Hall Effect Sensor

Supply Voltage (Over Voltage) 18V

Supply Voltage (Operating) 5V + 10%

Reverse Voltage Protection -14.5V

Magnetic Flux Density Unlimited

Supply Current, IDD 6.5 mA

Output Current (Short to VDD) +12 mA

Output Current (Short to VSS) -12 mA

Operating Temperature Range, TA -40°C to 150°C

Storage Temperature Range, TS -55°C to 165°C

ESD Sensitivity +5kV

Absolute Maximum Ratings

Melexis Programmer

Melexis offers a programmer (PTC-01) for

programming the MLX90215. The PTC-01 comes

complete with windows based software that makes

programming the MLX90215 simple. The programmer

communicates with a PC via a RS232 serial interface.

The programmer and software allows users to load

settings in the MLX90215, take measurements,

calibrate sensors, and program the MLX90215. For

more information the PTC-01 goto

www.melexis.com, or contact Melexis.

Left, PTC-01 windows

based software.

Works with any 9 Pin

Serial Port equipped

PC running windows

9x,W2000 or XP.

Melexis PTC-01

Programmer

MLX90215

Precision Programmable

Linear Hall Effect Sensor

3901090215 Page 7 9/09/03

Rev 007

Clamping the Output Voltage

The MLX90215 has a 2-bit CLAMP feature which

allows Four output voltage options. The CLAMP

feature is independent of the gain, and will not effect

sensitivity of the device. The table below illustrates

limits for each of the four options.

Bit Value Limits (% VDD)

0 (default) no clamp

1 5 to 45

2 10 to 90

3 5 to 95

Application Comments

The following is a list of recommended operating

parameters that will help to ensure the accuracy and

stability of the MLX90215. These are not the absolute

programming limits of the device.

1.) Voq is best programmed in the absence of any

magnetic influence and to voltages closest to 1/2

VDD, where temperature drift will be +/-0.4% or

less. It is not recommended to use VOQ values close

to 0 volts or V

DD when programming extremely

high sensitivity (> 100 mV/mT) values. Tempera-

ture instability may be observed on some devices

under these conditions.

2.) Best linearity of sensitivity is obtained when VOQ is

programmed at 1/2VDD. This is with the 1/2VDD

function enabled.

3.) Best linearity of sensitivity is obtained when the

gain is programmed between 5mV/mT and

100mV/mT.

4.) Best temperature stability is realized when the

temperature compensation function is programmed

to zero ppm/oC.

5.) The Test/Readback pin is for diagnostic use only.

This pin is normally tied to GND. Contact Melexis

for more details on programming this device.

Installation Comments

1.) Avoid mechanical stress on leads or package.

Stress may cause VOQ shift.

A.) Avoid bending leads at the package interface.

B.) Support the leads by clamping, when bending.

C.) Avoid gluing device to another material. This

may cause temperature-related stress.

2.) CMOS products are static sensitive devices, please

observe ESD precautions.

3.) Observe temperature limits during soldering.

Bit Allocation Table

Bit Function

1 INVERTSLOPE

2 OFFSETDAC 5

3 OFFSETDAC 6

4 OFFSETDAC 7

5 OFFSETDAC 8

6 OFFSETDAC 9

7 OFFSETDAC 4

8 OFFSETDAC 3

9 OFFSETDAC 2

10 OFFSETDAC 1

11 OFFSETDAC 0

12 FINEGAIN 0

13 FINEGAIN 1

14 FINEGAIN 2

15 HALFVDD

16 FINEGAIN 3

17 FINEGAIN 4

18 FINEGAIN 5

19 FINEGAIN 8

20 FINEGAIN 9

22 FINEGAIN 7

23 ROUGHGAIN 2

24 ROUGHGAIN 1

25 ROUGHGAIN 0

26 TEMP CO 0

27 TEMP CO 1

28 TEMP CO 2

29 TEMP CO 3

30 TEMP CO 4

31 CLAMP 1

32 CLAMP 0

33 MEMLOCK

34 TEST 0

35 TEST 1

36 TEST 2

37 TEST 3

21 FINEGAIN 6

3901090215 Page 8 9/09/03

Rev 007

MLX90215

Precision Programmable

Linear Hall Effect Sensor

Physical Characteristics

MLX90215

Precision Programmable

Linear Hall Effect Sensor

3901090215 Page 9 9/09/03

Rev 007

Application Notes

Linear Precision Current Sensor

The Programmable gain, offset, and temperature

compensation of MLX90215 allows great flexiblity in

the design of a current sensor.

Current flowing through a conductor can produce a

proportional magnet field. The MLX90215 can then

produce an output voltage proportional to the current.

Using the programmable gain and offset function the

output of the MLX90215 can be adjusted to sense a

wide range of current allowing for a flexible design.

Slotted Torroid Example Assuming infinite

permeabilty of the core, the magnetic field through the

air gap produced by a single wire turn is given by

equation 2

Equation 2

Where: I = current in Amperes

B = magnetic field in Tesla

lg = length of air gap in Meters

uo = Permeability of free space (4π10-7H/m)

This equation is a close estimate for the field in the air

gap, but does not take into account magnetic losses in

the core, fringing effects, and mechanical tolerances of

the air gap. The programmable MLX90215 can be

adjusted to compensate for these errors simplifying the

design. The temperature compensation of MLX90215

can also be adjusted to counteract temperature losses of

core.

For sensing a current ±100A, with an air gap of 2mm

equation 2 yields a magnetic field range of ±63mT. The

output range of the MLX90215 is 0.5V to 4.5V (4V full

scale). Equations 3a and 3b yield a sensitivity of 32mV/

mT and a Voq of 2.5V.

Equation 3

a) S = 4000mV/ 126mT

b) Voq = 4V/2 + 0.5V

The resulting gain of the current sensor is 20mV/A with

an offset of 2.5V. For best results it is recommend that

MLX90215 be programmed with a Voq of 50% Vdd 1/2

Vdd bit set.

Magnetic Suppliers:

Elna Ferrites Technologies Inc

Eastern Components

Fair Rite Products Corp

3901090215 Page 10 9/09/03

Rev 007

MLX90215

Precision Programmable

Linear Hall Effect Sensor

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 informa-

tion set forth herein or regarding the freedom of the described devices from patent infringement. Melexis re-

serves the right to change specifications and prices at any time and without notice. Therefore, prior to design-

ing 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, un-

usual environmental requirements, or high reliability applications, such as military, medical life-support 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 dam-

ages, 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.

Reliability Information

Melexis devices are classified and qualified regarding suitability for infrared, vapor phase and wave soldering

with usual (63/37 SnPb-) solder (melting point at 183degC).

The following test methods are applied:

IPC/JEDEC J-STD-020A (issue April 1999)

Moisture/Reflow Sensitivity Classification For Nonhermetic Solid State Surface Mount Devices

CECC00802 (issue 1994)

Standard Method For The Specification of Surface Mounting Components (SMDs) of Assessed Quality

MIL 883 Method 2003 / JEDEC-STD-22 Test Method B102

Solderability

For all soldering technologies deviating from above mentioned standard conditions (regarding peak tempera-

ture, 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.

For more information on manufacturability/solderability see quality page at our website:

http://www.melexis.com/

For the latest version of this document, go to our website at:

www.melexis.com

Or for additional information contact Melexis Direct:

Europe and Japan: All other locations:

Phone: +32 13 67 04 95 Phone: +1 603 223 2362

E-mail: sales_europe@melexis.com E-mail: sales_usa@melexis.com

QS9000, VDA6.1 and ISO14001 Certified