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HAL800 Datasheet(PDF) 7 Page - Micronas |
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HAL800 Datasheet(HTML) 7 Page - Micronas |
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7 / 24 page  HAL 800 Micronas 7 2.2. Digital Signal Processing and EEPROM The DSP is the major 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 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 (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 is defined as: – 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). 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. The ADC converts positive or negative Hall voltages (operates with magnetic north and south poles at the branded side of the package) in a digital value. This signal is filtered in the Digital Filter and is readable in the ADC-READOUT register as long as the LOCK bit is not set. Note: The ADC-READOUT values and the resolution of the system depends on the filter frequency. Positive values accord to a magnetic north pole on the branded side of the package. Fig. 2–6 and Fig. 2–7 show typi- cal ADC-READOUT values for the different magnetic field ranges and filter frequencies. –6000 –4000 –2000 0 2000 4000 6000 –200–150–100 –50 0 50 100 150 200 mT B ADC- READOUT Filter = 500 Hz Range 150 mT Range 90 mT Range 75 mT Range 30 mT Fig. 2–6: Typical ADC-READOUT versus magnetic field for filter = 500 Hz ∆V OUT ∆B Sensitivity = VOUT ∼ Sensitivity × B + VOQ –1500 –1000 –500 0 500 1000 1500 –200–150–100 –50 0 50 100 150 200 mT B ADC- READOUT Range 150 mT Range 90 mT Range 75 mT Range 30 mT Filter = 2 kHz Fig. 2–7: Typical ADC-READOUT versus magnetic field for filter = 2 kHz |
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