HAL1002 datasheet(12/29 Pages) MICRONAS

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HAL 1002

DATA SHEET

April 25, 2014; DSH000163_001EN

Micronas

LOCK Register

By setting the LSB of this 2-bit register, all registers will

be locked, and the sensor will no longer respond to

any supply voltage modulation. This bit is active after

the first power-off and power-on sequence after setting

the LOCK bit. After locking of sensor is active, it will no

longer respond to power supply modulation.

Warning: This register cannot be reset!

ADC-READOUT Register

This 14-bit register delivers the actual digital value of

the applied magnetic field after filtering but before the

signal processing. This register can be read out and is

the basis for the calibration procedure of the sensor in

the system environment.

D/A-READOUT

This 14-bit register delivers the actual digital value of

the applied magnetic field after the signal processing.

This register can be read out and is the basis for the

calibration procedure of the sensor in the system

environment.

Note: The MSB and LSB are reversed compared with

all the other registers. Please reverse this regis-

ter after readout.

Note: During calibration it is mandatory to select the

Analog Output as output format.The D/A-Read-

out register can be read out only in the output

mode. For all other modes the result read back

from the sensor will be a 0. After the calibration

the output format can than easily be switched to

the wanted output mode.

3.4. General Calibration Procedure

For

calibration

the

system

environment,

the

application kit from Micronas is recommended. It

contains the hardware for the generation of the serial

telegram for programming and the corresponding

software for the input or calculation of the register

values.

In this section, the programming of the sensor using

this tool is explained. Please refer to Section 5. on

page 24 for information about programming without

this tool.

For the individual calibration of each sensor in the

customer‘s application, a two-point adjustment is

recommended (see Fig. 3–1 for an example). When

using the application kit, the calibration can be done in

three steps:

Step 1: Input of the registers which need not be

adjusted individually

The magnetic circuit, the magnetic material with its

temperature characteristics, and the filter frequency,

are given for this application.

Therefore, the values of the following registers should

be identical for all sensors in the application.

–FILTER

(according to maximum signal frequency)

The 500 Hz range is recommended for highest

accuracy.

–RANGE

(according to the maximum magnetic field at the

sensor position)

– TC and TCSQ

(depends on the material of the magnet and the

other temperature dependencies of the application)

Write the appropriate settings into the HAL1002

registers.

Step 2: Calculation of the Sensor Parameters

Fig. 3–1 shows the typical characteristics for a

contactless switch. There is a mechanical range where

the sensor must be switched high and where the

sensor must be switched low.

Set the system to the calibration point where the

sensor output must be high, and press the key

“Readout BOFF”. The result is the corresponding

ADC-READOUT value.

Note: The magnetic south pole on the branded side

generates negative ADC-READOUT values, the

north polarity positive values.

Then, set the system to the calibration point where the

sensor output must be low, press the key “Readout

BON” and get the second ADC-READOUT value.

Now, adjust the hysteresis to the desired value. The

hysteresis is the difference between the switching

points and suppresses oscillation of the output signal.

With 100% hysteresis, the sensor will switch low and

high exactly at the calibration points. A lower value will

adjust the switching points closer together. Fig. 3–1

shows an example with 80% hysteresis.

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