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HAL805UT-E Datasheet(PDF) 7 Page - Micronas |
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HAL805UT-E Datasheet(HTML) 7 Page - Micronas |
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7 / 24 page  PRELIMINARY DATA SHEET HAL 805 Micronas 7 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 three 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 and TCSQ for the temperature characteristics of the mag- netic 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 (see Fig. 2–4 and Fig. 2–5 for examples). – 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 Micronas registers and LOCK for the locking of all registers. The Micronas registers are programmed and locked during production and are read-only for the customer. These registers are used for oscillator frequency trimming, A/D converter offset compensation, and several other special 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 magnetic north and south poles at the branded side of the package) to a digital value. Positive values correspond to a mag- netic north pole on the branded side of the package. The digital signal is filtered in the internal low-pass fil- ter and is readable in the ADC-READOUT register. Depending on the programmable magnetic range of the Hall IC, the operating range of the A/D converter is from −30 mT...+30 mT up to −150 mT...+150 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 ADC-READOUT at any given magnetic field depends on the programmed magnetic field range but also on the filter frequency. Fig. 2–6 shows the typical ADC-READOUT values for the different magnetic field ranges with the filter frequency set to 2 kHz. The rela- tionship between the minimum and maximum ADC- READOUT values and the filter frequency setting is listed in the following table. ∆V OUT ∆B Sensitivity = VOUT ∼ Sensitivity × B + VOQ Filter Frequency ADC-READOUT RANGE 80 Hz −3968...3967 160 Hz −1985...1985 500 Hz −5292...5290 1 kHz −2646...2645 2 kHz −1512...1511 –2000 –1500 –1000 –500 0 500 1000 1500 2000 –200–150–100 –50 0 50 100 150 200 mT B ADC- READOUT Range 150 mT Filter = 2 kHz Range 90 mT Range 60 mT Range 30 mT Fig. 2–6: Typical ADC-READOUT versus magnetic field for filter = 2 kHz |
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