HAL856UT-A datasheet(13/42 Pages) MICRONAS

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DATA SHEET

HAL856

Micronas

March 23, 2010; DSH000142_002EN

Current Source

The CURRENTSOURCE register contains three “sub”-

registers: The 3 LSB contain the HIGH CURRENT set-

ting, the next 4 bits the LOW CURRENT setting of the

2-wire output. The two MSB are used for the SLEW

RATE register.

There are 12 combinations of high and low current lev-

els.

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 (Programmer Board Version 5.1) and the

corresponding software (PC856) for the input of the

For the individual calibration of each sensor in the cus-

tomer application, a two-point adjustment is recom-

mended (see Fig. 2–6 on page 15 for an example).

The calibration shall be done as follows:

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, the

part number and the output format are given for this

application.

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)

– OUTPUT FORMAT

(according to the application requirements)

–OUTPUT PERIOD

(according to the application requirements)

–PARTNUMBER

(in case Biphase-M output format is used)

– LOW CURRENT

– HIGH CURRENT

– OFFSET CORRECTION

–SLEW RATE

Write the appropriate settings into the HAL856 regis-

ters.

Table 2–8: HIGH/LOW CURRENT register definition

Typ. Supply Current

HIGH

CURRENT

LOW

CURRENT

IDD,Low

IDD,High

Unit

13.5

14.5

15.5

616

713.5

714

714.5

715

715.5

716

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