HAL855UT-K datasheet(15/42 Pages) MICRONAS

15 / 42 page

DATA SHEET

HAL855

Micronas

Nov. 26, 2008; DSH000149_003EN

Step 1: Input of the registers which need not be

adjusted individually

The register values for the following registers are given

for all applications:

–FILTER

Select the filter frequency: 500 Hz

–RANGE

Select the magnetic field range: 40 mT

–TC

For this magnetic material: 6

–TCSQ

For this magnetic material: 14

– OUTPUT FORMAT

Select the output format: PWM

– OUTPUT PERIOD

Select the output format: 8 ms

– PARTNUMBER

For this example: 1

– OFFSET CORRECTION

For this example: none

–SLEW RATE

For this example: 0 (fastest)

Enter these values in the software, and use the “write

and store” command for permanently writing the val-

ues in the registers.

Step 2: Initialize DSP

–SHIFT

Select Shift: 50%

–SLOPE

Select Slope: 0.1938 (see Table 2–8 on page 13)

– OUTPUT CHARACTERISTIC

Select output characteristic: ’Linear Standard’

Step 3: Define Calibration Points

The Micronas software PC85x uses default settings

DOUT1NOM = 0 and DOUT2NOM = 3968.

DOUT1NOM corresponds to the angle position −25°,

DOUT2NOM to +25°.

Step 4: Calculation of Shift and Slope

There are two ways to calculate the values for Shift

and Slope.

Manual Calculation:

1. Set the system to calibration point 1 (angle 1 = 25°)

2. read the register DIGITAL OUTPUT.

For our example, the result is

DIGITAL OUTPUT = DOUT1 = 3291.

3. Set the system to calibration point 2 (angle 2 =

−25°)

4. read the register DIGITAL OUTPUT again.

For our example, the result is

DIGITAL OUTPUT = DOUT2 = 985.

With these measurements and the pre-programming

of the sensor, the values for Slope and Shift are calcu-

lated as:

Write the calculated values for Slope and Shift and a

linear output characteristic ranging from 10% to 90%

output duty cycle into the EEPROM memory.

Software Calibration:

Use the menu CALIBRATE from the PC software and

enter the values for the registers which are not

adjusted individually. Set the system to calibration

point 1 (angle 1 = 25°), hit the button “Digital Output1”,

set the system to calibration point 2 (angle 2 =

−25°),

hit the button “Digital Output2”, and hit the button “Cal-

culate”. The software will then calculate the appropri-

ate Shift and Slope.

This calculation has to be done individually for each

sensor. Now, select an output characteristic from the

selection box “Output Characteristics” and then press

the button “write and store” for programming the sensor.

Step 5: Locking the Sensor

The last step is activating the LOCK function with the

“LOCK” command. Please note that the LOCK function

becomes effective after power-down and power-up of

the Hall IC. The sensor is now locked and does not

respond to any programming or reading commands.

Warning: This register cannot be reset!

Slope

3968

985

3291

–

()

-------------------------------

0.1938

0.3335

–

Shift

100%

4096

--------------

3968

985

2048

–

()

0.3335

–

()

0.1938

--------------------------------------------------------------

–

⎝⎠

⎛⎞

52.22%

HAL855UT-K датащи(PDF) 15 Page - Micronas

HAL855UT-K датащи(HTML) 15 Page - Micronas

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42

датащи скачать

ссылки URL