HAL855UT-K datasheet(28/42 Pages) MICRONAS

28 / 42 page

HAL855

DATA SHEET

Nov. 26, 2008; DSH000149_003EN

Micronas

4.3. Measurement of a Biphase-M Output Signal

In order to read the Biphase-M signal Micronas sug-

gests to use a port interrupt which is configured to gen-

erate interrupts with both the falling and rising edge of

the incoming signal.

With each interrupt a timer shall be read out. The first

two edges (SYNC bit) define the bit time tp0. Compar-

ing subsequent timer readouts with tp0 successively

decodes the Biphase-M pattern.

4.4. Temperature Compensation

The relationship between the temperature coefficient

of the magnet and the corresponding TC and TCSQ

codes for linear compensation is given in the following

table. In addition to the linear change of the magnetic

field with temperature, the curvature can be adjusted

as well. For this purpose, other TC and TCSQ combi-

nations are required which are not shown in the table.

Micronas also offers a software named TC-Calc to

optimize the TC and TCSQ values for each individual

application based on customer measurement results.

Please contact Micronas for more detailed information.

Table 4–1: Temperature compensation

Typ. Temperature Coefficient

of Magnet (ppm/K)

TCSQ

600

570

540

520

490

470

440

420

360

330

300

280

260

240

200

180

150

130

−20

−50

−70

−100

−180

−200

−230

−260

−280

−360

−390

−410

−31

−490

−30

−510

−29

−540

−28

−610

−27

−640

−26

−670

−25

−740

−24

−780

−23

−840

−22

−880

−21

−950

−20

−980

−19

−1010

−18

Table 4–1: Temperature compensation, continued

Typ. Temperature Coefficient

of Magnet (ppm/K)

TCSQ

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