HAL810 Datasheet, PDF(9/30 Page) Micronas – Programmable Linear Hall-Effect Sensor

English

English German Russian Spanish Italian Polish Chinese Japanese Korean French Portuguese	Language :

HAL810 Datasheet, PDF (9/30 Pages) Micronas – Programmable Linear Hall-Effect Sensor

◁

DATA SHEET

HAL 810

Note: During application design, it should be taken into

consideration that the maximum and minimum

ADC-READOUT is not exceeded during calibra-

tion and operation of the Hall IC. Consequently,

the maximum and minimum magnetic fields that

may occur in the operational range of a specific

application should not saturate the A/D converter.

Please note that the A/D converter saturates at

magnetic fields well above, respectively below,

the magnetic range limits. This large safety band

between specified magnetic range and true oper-

ational range helps to avoid saturation.

Range

The RANGE bits are the three lowest bits of the

MODE register; they define the magnetic field range

of the A/D converter.

Magnetic Field Range

â30 mTâ¦30 mT

â40 mTâ¦40 mT

â60 mTâ¦60 mT

â75 mTâ¦75 mT

â80 mTâ¦80 mT

â90 mTâ¦90 mT

â100 mTâ¦100 mT

â150 mTâ¦150 mT

Range

Filter

The FILTER bits are the three highest bits of the

MODE register; they define the â3 dB frequency of the

digital low pass filter.

â3 dB Frequency

80 Hz

160 Hz

500 Hz

1 kHz

2 kHz

Filter

TC and TCSQ

The temperature dependence of the magnetic sensitiv-

ity can be adapted to different magnetic materials in

order to compensate for the change of the magnetic

strength with temperature. The adaptation is done by

programming the TC (Temperature Coefficient) and

the TCSQ registers (Quadratic Temperature Coeffi-

cient). Thereby, the slope and the curvature of the

temperature dependence of the magnetic sensitivity

can be matched to the magnet and the sensor assem-

bly. As a result, the output characteristic can be fixed

over the full temperature range. The sensor can com-

pensate for linear temperature coefficients ranging

from about â3100 ppm/K up to 400 ppm/K and qua-

dratic coefficients from about â5 ppm/KÂ² to 5 ppm/KÂ².

Please refer to Section 4.3. on page 23 for the recom-

mended settings for different linear temperature coeffi-

cients.

DCSensitivity

The DCSENSITIVITY register contains the parameter

for the multiplier in the DSP. The DCSensitivity is pro-

grammable between â4 and 4. The register can be

changed in steps of 0.00049. DCSensitivity = 1 corre-

sponds to an increase of the output duty cycle by

100% if ADC-READOUT increases by 2048.

For all calculations, the digital value of the A/D con-

verter is used. This digital information is derived

from the magnetic signal and is readable from the

ADC-READOUT register.

DCSensitivity =

ÎDCOUT * 2048

ÎADC-Readout * 100%

DCOQ

The DCOQ register contains the parameter for the

adder in the DSP. DCOQ is the output duty cycle with-

out external magnetic field (B = 0 mT, respectively

ADC-READOUT = 0) and programmable from â100%

to 100%. The register can be changed in steps of

0.0976%.

Note: If DCOQ is programmed as negative values, the

maximum output duty cycle is limited to:

DCOUTmax = DCOQ+100%

For calibration in the system environment, a 2-point

adjustment procedure (see Section 2.3.) is recom-

mended. The suitable DCSensitivity and DCOQ values

for each sensor can be calculated individually by this

procedure.

Micronas

Feb. 6, 2009; DSH000034_003EN

▷