MLX90215 datasheet(7/10 Pages) MELEXIS

7 / 10 page

MLX90215

Precision Programmable

Linear Hall Effect Sensor

3901090215

Page 7

9/09/03

Rev 007

ClampingtheOutputVoltage

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

5 to 45

10 to 90

5 to 95

ApplicationComments

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 VDD 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 i s

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

function enabled.

3.) Best linearity of sensitivity is obtained when the

gain

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.

InstallationComments

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.

BitAllocationTable

Bit

Function

INVERTSLOPE

OFFSETDAC 5

OFFSETDAC 6

OFFSETDAC 7

OFFSETDAC 8

OFFSETDAC 9

OFFSETDAC 4

OFFSETDAC 3

OFFSETDAC 2

OFFSETDAC 1

OFFSETDAC 0

FINEGAIN 0

FINEGAIN 1

FINEGAIN 2

HALFVDD

FINEGAIN 3

FINEGAIN 4

FINEGAIN 5

FINEGAIN 8

FINEGAIN 9

FINEGAIN 7

ROUGHGAIN 2

ROUGHGAIN 1

ROUGHGAIN 0

TEMP CO 0

TEMP CO 1

TEMP CO 2

TEMP CO 3

TEMP CO 4

CLAMP 1

CLAMP 0

MEMLOCK

TEST 0

TEST 1

TEST 2

TEST 3

FINEGAIN 6

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