HAR2425 datasheet(18/33 Pages) MICRONAS

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HAR 24xy

DATA SHEET

July 14, 2015; DSH000170_001EN

Micronas

Failure Indication for HAR 2455

The HAR 2455 indicates a failure by changing the

PWM frequency. The different errors are then coded in

different duty-cycles.

Note: In case of an error the sensor changes the

selected PWM frequency. Example:

During normal operation the PWM frequency is

1 kHz, in case of an error 500 Hz.

3.4. Calibration of the Sensor

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 LabView based

programming environment for the input of the register

values (see Section 6.2. on page 32).

For the individual calibration of each sensor in the cus-

tomer application, a two point calibration is recom-

mended.

A detailed description of the calibration software exam-

ple provided by Micronas, calibration algorithm, pro-

gramming sequences and register value calculation

can be found in the Application Note “HAL 24xy Pro-

gramming Guide”.

Table 3–5: Failure indication for HAR 2455

Failure Mode

Frequency

Duty-Cycle

EEPROM and state

machine self-test

50%

95%

Adder overflow

50%

85%

Overvoltage

50%

75%

Undervoltage

50%

100%

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