HAL815 datasheet(9/24 Pages) MICRONAS

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ADVANCE INFORMATION

HAL 815

Micronas

Clamping Voltage

The output voltage range can be clamped in order to

detect failures like shorts to VDD or GND or an open

circuit.

The CLAMP-LOW register contains the parameter for

the lower limit. The lower clamping voltage is program-

mable between 0 V and VDD/2. For VDD = 5 V, the reg-

ister can be changed in steps of 2.44 mV.

The CLAMP-HIGH register contains the parameter for

the upper limit. The upper clamping voltage is pro-

grammable between 0 V and VDD. For VDD = 5 V, in

steps of 2.44 mV.

LOCKR

By setting this 1-bit register, all registers will be locked,

and the sensor will no longer respond to any supply

voltage modulation.

Warning: This register cannot be reset!

ADC-READOUT

This 14-bit register delivers the actual digital value of

the applied magnetic field before the signal process-

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

the calibration procedure of the sensor in the system

environment.

2.3. Calibration Procedure

2.3.1. General Procedure

For calibration in the system environment, the applica-

tion 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 of the register values.

In this section, programming of the sensor using this

programming tool is explained. Please refer to

Section 5. on page 19 for information about program-

ming without this tool.

For the individual calibration of each sensor in the cus-

tomer application, a two point adjustment is recom-

mended (see Fig. 2–7 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, the filter frequency, and

low and high clamping voltage are given for this appli-

cation.

Therefore, the values of the following registers should

be identical for all sensors of the customer application.

–FILTER

(according to the maximum signal frequency)

–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)

– CLAMP-LOW and CLAMP-HIGH

(according to the application requirements)

Write the appropriate settings into the HAL 815 regis-

ters.

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