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HAL855 Datasheet(PDF) 9 Page - Micronas |
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HAL855 Datasheet(HTML) 9 Page - Micronas |
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9 / 42 page  DATA SHEET HAL855 Micronas Nov. 26, 2008; DSH000149_003EN 9 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 on page 8. Terminology: SLOPE: name of the register or register value Slope: 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. The parameters SLOPE and SHIFT are used for the individual calibration of the sensor in the magnetic cir- ucit. – The parameter Shift corresponds to the output sig- nal at B = 0 mT. – The parameter Slope defines the magnetic sensitiv- ity. Group 2 contains the registers for defining the output characteristics: OUTPUT FORMAT, OUTPUT PERIOD or OUTPUT BITTIME, SLEW RATE and OUTPUT CHARACTERISTIC. The shape of the output signal is determined by the output characteristic, which, in turn, is defined by the 32 setpoints of the sensor. A value for each of the set- points must be defined. The setpoints are distributed evenly along the magnetic field axis allowing linear interpolation between the 32 setpoints (see Fig. 2–4). Group 3 contains the PARTNUMBER, the Micronas registers, and LOCK for the locking of all registers. After locking, the PARTNUMBER register is only avail- able in Biphase-M output mode. The Micronas regis- ters are programmed and locked during production and are read-only for the customer. These registers are used for oscillator frequency trimming and several other special settings. An external magnetic field generates a Hall voltage on the Hall plate. The A/D-converter converts the ampli- fied positive or negative Hall voltage (operates with magnetic north and south poles at the branded side of the package) to a digital value. The digital signal is filtered 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 DIGITAL OUTPUT register. Depending on the pro- grammable 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 calcu- lated based on the values of slope, shift, and the defined output characteristic. The result is converted to the different digital output formats (PWM and Biphase-M) and stabilized by a open-drain output tran- sistor stage. The DIGITAL OUTPUT value at any given magnetic field depends on the settings of the magnetic field range, the low-pass filter, TC, TCSQ values and the programmed output characteristic. The DIGITAL OUTPUT range is min. 0 to max. 4095. Note: During application design, it should be taken into consideration that DIGITAL OUTPUT should not saturate in the operational range of the specific application. % Setpoint PWM HAL 855 0 4 8 121620242832 0 10 20 30 40 50 60 70 80 90 100 Logarithmic Sine Linear Logarithmic Sine Linear Fig. 2–4: Example for different output characteristics |
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