HAL856 datasheet(11/42 Pages) MICRONAS

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DATA SHEET

HAL856

Micronas

March 23, 2010; DSH000142_002EN

Output Period

The OUTPUT PERIOD register defines the PWM

period of the output signal.

Output Bittime

The OUTPUT BITTIME register defines the bit time of

the Biphase-M output signal. OUTPUT BITTIME is

“sub”-register of the SPECIAL CUSTOMER register.

Note: Setting the Biphase-M bit time to 40

μs simulta-

neously switches the programming telegram to

the same bit time. Hence after writing the

OUTPUT BITTIME register the timing of the pro-

gramming device has to be set accordingly.

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 adaption is done by

programming the TC (Linear Temperature Coefficient)

and the TCSQ registers (Quadratic Temperature Coef-

ficient). 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 signal characteristic can be

fixed over the full temperature range. The sensor can

compensate for linear temperature coefficients ranging

from about

−2100 ppm/K up to 600 ppm/K and qua-

dratic coefficients from about

−5ppm/K2 to 5 ppm/K2.

Please refer to Section 4.3. on page 30 for the recom-

mended settings for different linear temperature coeffi-

cients.

Slope

The SLOPE register contains the parameter for the

multiplier in the DSP. The Slope is programmable

between

−4 and 4. The register can be changed in

steps of 0.00049. Slope = 1 corresponds to an

increase of the output signal by 100% if the digital

value at the A/D-converter output increases by 2048.

For all calculations, the digital value after the digital

signal processing is used. This digital information is

readable from the DIGITAL OUTPUT register.

Shift

The SHIFT register contains the parameter for the

adder in the DSP. Shift is the output signal without

external magnetic field (B = 0 mT) and programmable

from

−100% up to 100%. For calibration in the system

environment, a 2-point adjustment procedure is rec-

ommended. The suitable Slope and Shift values for

each sensor can be calculated individually by this pro-

cedure.

Part Number

In case of Biphase-M output, a part number can be

defined. This part number will be sent during power-on

of the sensor if the PARTNUMBER ENABLE bit is set.

Afterwards, the sensor will send the digital value corre-

sponding to the applied magnetic field.

– The PARTNUMBER ENABLE bit is part of the

SPECIAL CUSTOMER register.

– The OUTPUT PERIOD register defines the time

interval for which the part number is sent.

Table 2–4: OUTPUT PERIOD register definition

PWM Output Period

Bit Setting

128 ms; 12-bit resolution

64 ms; 12-bit resolution

32 ms; 12-bit resolution

16 ms; 12-bit resolution

8 ms; 12-bit resolution

4 ms; 11-bit resolution

2 ms; 10-bit resolution

1 ms; 9-bit resolution

Table 2–5: OUTPUT BITTIME register definition

Biphase-M Output Bit Time

Bit Setting

μs0

84 µs

168 µs

320 µs

700 µs

1.6 ms

3.2 ms

6.4 ms

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