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HAL805UT-A Datasheet(PDF) 10 Page - Micronas |
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HAL805UT-A Datasheet(HTML) 10 Page - Micronas |
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10 / 30 page  HAL 805 DATA SHEET 10 Feb. 14, 2006; 6251-513-3DS Micronas Clamping Voltage The output voltage range can be clamped in order to detect failures like shorts to VDD or GND or an open circuit. The CLAMP-LOW register contains the parameter for the lower limit. The lower clamping voltage is program- mable between 0 V and VDD/2. For VDD = 5 V, the reg- ister can be changed in steps of 2.44 mV. The CLAMP-HIGH register contains the parameter for the upper limit. The upper clamping voltage is pro- grammable between 0 V and VDD. For VDD = 5 V, in steps of 2.44 mV. LOCKR By setting this 1-bit register, all registers will be locked, and the sensor will no longer respond to any supply voltage modulation. This bit is active after the first power-off and power-on sequence after setting the LOCK bit. Warning: This register cannot be reset! ADC-READOUT This 14-bit register delivers the actual digital value of the applied magnetic field before the signal process- ing. This register can be read out and is the basis for the calibration procedure of the sensor in the system environment. 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 and the corresponding software for the input of the register values. In this section, programming of the sensor using this programming tool is explained. Please refer to Section 5. on page 25 for information about program- ming without this tool. For the individual calibration of each sensor in the cus- tomer application, a two point adjustment is recom- mended (see Fig. 2–7 for an example). When using the application kit, the calibration can be done in three steps: 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, and low and high clamping voltage are given for this appli- cation. 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) – CLAMP-LOW and CLAMP-HIGH (according to the application requirements) Write the appropriate settings into the HAL805 regis- ters. |
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