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HAL825UT-A Datasheet(PDF) 8 Page - Micronas |
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HAL825UT-A Datasheet(HTML) 8 Page - Micronas |
8 / 32 page HAL82x DATA SHEET 8 Feb. 3, 2009; DSH000143_003EN Micronas 2.2. Digital Signal Processing and EEPROM The DSP is the main part of this sensor and performs the signal conditioning. The parameters for the DSP are stored in the EEPROM registers. The details are shown in Fig. 2–3. Terminology: SENSITIVITY: name of the register or register value Sensitivity: name of the parameter The EEPROM registers consist of four groups: Group 1 contains the registers for the adaption of the sensor to the magnetic system: MODE for selecting the magnetic field range and filter frequency, TC, TCSQ and TC-Range for the temperature characteris- tics of the magnetic sensitivity. Group 2 contains the registers for defining the output characteristics: SENSITIVITY, VOQ, CLAMP-LOW, and CLAMP-HIGH. The output characteristic of the sensor is defined by these 4 parameters. – The parameter VOQ (Output Quiescent Voltage) cor- responds to the output voltage at B = 0 mT. – The parameter Sensitivity defines the magnetic sen- sitivity: – The output voltage can be calculated as: The output voltage range can be clamped by setting the registers CLAMP-LOW and CLAMP-HIGH in order to enable failure detection (such as short-circuits to VDD or GND and open connections). Group 3 contains the general purpose register GP. The GP Register can be used to store customer informa- tion, like a serial number after manufacturing. Micro- nas will use this GP REGISTER to store informations like, Lot number, wafer number, x and y position of the die on the wafer, etc. This information can be readout by the customer and stored in it’s on data base or it can stay in the sensor as is. Group 4 contains the Micronas registers and LOCK for the locking of all registers. The Micronas registers are programmed and locked during production. These reg- isters are used for oscillator frequency trimming, A/D converter offset compensation, and several other spe- cial settings. An external magnetic field generates a Hall voltage on the Hall plate. The ADC converts the amplified positive or negative Hall voltage (operates with mag- netic north and south poles at the branded side of the package) to a digital value. The digital signal is fil- tered in the internal low-pass filter and manipulated according to the settings stored in the EEPROM. The digital value after signal processing is readable in the D/A-READOUT register. Depending on the program- mable magnetic range of the Hall IC, the operating range of the A/D converter is from −30 mT...+30 mT up to −100 mT...+100 mT. During further processing, the digital signal is multi- plied with the sensitivity factor, added to the quiescent output voltage and limited according to the clamping voltage. The result is converted to an analog signal and stabilized by a push-pull output transistor stage. The D/A-READOUT at any given magnetic field depends on the programmed magnetic field range, the low-pass filter, TC values and CLAMP-LOW and CLAMP-HIGH. The D/A-READOUT range is min. 0 and max. 16383. Note: During application design, it should be taken into consideration that the maximum and mini- mum D/A-READOUT should not saturate in the operational range of the specific application. Range The RANGE bits are bit 2 and 3 of the MODE register; they define the magnetic field range of the A/D con- verter. Sensitivity V Δ OUT B Δ ----------------- = V OUT Sensitivity ∼ BV OQ + × Magnetic Field Range RANGE −30 mT...30 mT 0 −60 mT...60 mT 1 −80 mT...80 mT 2 −100 mT...100 mT 3 |
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