HAL2830 View Datasheet(PDF) - Micronas

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HAL2830

Linear Hall-Effect Sensor Family with SENT Interface

Micronas 

HAL 283x

DATA SHEET

3.2.1. Temperature Compensation

Terminology:

D0: name of the register or register value

d0: name of the parameter

The customer programmable parameters “c” (sensitiv-

ity) and d (offset) are polynomials of the temperature.

The temperature is represented by the adjusted read-

out value TVAL of a built-in temperature sensor.

The update rate of the temperature value TVAL is less

than 100 ms.

The sensitivity polynomial c(TVAL) is of second order

in temperature:

cTVAL = c0 + c1  TVAL + c2  TVAL2

For the definition of the polynomial coefficients please

refer to Section 3.2.2. on page 9.

The Offset polynomial d(TADJ) is linear in temperature:

dTVAL = d0 + d1  TVAL

For the definition of the polynomial coefficients, please

refer to Section 3.2.2. on page 9.

For the calibration procedure of the sensor in the sys-

tem environment, the two values HVAL and TADJ are

provided. These values are stored in volatile registers.

TVAL

The number TVAL provides the adjusted value of the

built-in temperature sensor.

TVAL is a 16-bit two’s complement binary ranging from

32768 to 32767.

It is stored in the TVD register.

Note: The actual resolution of the temperature sensor

is 12 bit. The 16-bit representation avoids

rounding errors in the computation.

The relation between TVAL and the junction tempera-

ture TJ is

TJ = 0 + TVAL  1

Table 3–1: Relation between TJ and TADJ (typical

values)

Coefficient

0

1

Value

Unit

71.65

°C

1 / 231.56 °C

HVAL

The number HVAL represents the digital output value y

which is proportional to the applied magnetic field.

HVAL is a 16-bit two’s complement binary ranging from

32768 to 32767.

It is stored in the HVD register.

y = H-----V----A----L--

32768

In case of internal overflows, the output will clamp to

the maximum or minimum HVAL value.

Please take care that during calibration, the output sig-

nal range does not reach the maximum/minimum

value.

8

Jan. 18, 2016; DSH000165_002EN

Micronas

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