HAL880 datasheet(9/34 Pages) MICRONAS

9 / 34 page

DATA SHEET

HAL880

Micronas

Feb. 23, 2009; DSH000152_001EN

Filter

The FILTER bit is bit number 4 of the MODE register; it

defines the

−3 dB frequency of the digital low pass

filter.

Bit Time

The BITTIME bit is bit number 5 of the MODE register;

It defines the protocol bit time for the communication

between the sensor and the programmer board.

Output Format

The OUTPUTMODE bits are the bits numbers 6 to 7 of

the MODE register.

TC Register

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 adaption is done by

programming the TC (Temperature Coefficient) and

the TCSQ registers (Quadratic Temperature Coeffi-

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

perature dependence of the magnetic sensitivity can

be matched to the magnet and the sensor assembly.

As a result, the output voltage characteristic can be

fixed over the full temperature range. The sensor can

compensate for linear temperature coefficients ranging

from about

−3100 ppm/K up to 1000 ppm/K and qua-

dratic coefficients from about

−7ppm/K² to 2ppm/K².

The full TC range is separated in the following four

ranges:

TC (5 bit) and TCSQ (3 bit) have to be selected individu-

ally within each of the four ranges. For example: 0 ppm/k

requires TC-Range = 1, TC = 15 and TCSQ = 1.

Sensitivity

The SENSITIVITY register contains the parameter for

the multiplier in the DSP. The Sensitivity is program-

mable between

−4 and 4. For V

DD = 5 V, the register

can be changed in steps of 0.00049.

For all calculations, the digital value from the magnetic

field of the D/A converter is used. This digital informa-

tion is readable from the D/A-READOUT register.

VOQ

The VOQ register contains the parameter for the

adder in the DSP. VOQ is the output voltage without

external magnetic field (B = 0 mT) and programmable

from

−V

DD up to VDD. For VDD = 5 V, the register can

be changed in steps of 4.9 mV.

Note: If VOQ is programmed to a negative voltage, the

maximum output voltage is limited to:

−3 dB Frequency

FILTER

500 Hz

1kHz

Bit Time

BITTIME

1:64 (Typ. 1.75 ms)

1:128 (Typ. 3.5 ms)

Output Format

OUTPUTMODE

Analog Output (12 bit)

TC-Range [ppm/k]

GROUP

−3100 to −1800

−1750 to −550

−500 to +450 (default value)

+450 to +1000

SENSITIVITY

out

16384

ΔDA-Readout V

---------------------------------------------------------------

OUTmax

HAL880 Datasheet(PDF) 9 Page - Micronas

HAL880 Datasheet(HTML) 9 Page - Micronas

Html Pages

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 32 33 34

Datasheet Download

Link URL