HAL856 Datasheet, PDF (13/42 Pages) Micronas – Programmable Linear Hall-Effect Sensor with Arbitrary Output Characteristic (2-Wire)

DATA SHEET
HAL 856
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.
Table 2–8: HIGH/LOW CURRENT register definition
Typ. Supply Current
I_DD,Low
6
I_DD,High
13.5
Unit
mA
HIGH
CURRENT
5
LOW
CURRENT
12
6
14
mA 4
12
6
14.5
mA 3
12
6
15
mA 2
12
6
15.5
mA 1
12
6
16
mA 0
12
7
13.5
mA 5
4
7
14
mA 4
4
7
14.5
mA 3
4
7
15
mA 2
4
7
15.5
mA 1
4
7
16
mA 0
4
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
register values.
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.
Micronas
March 23, 2010; DSH000142_002EN
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