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IC-MA Datasheet(PDF) 11 Page - IC-Haus GmbH |
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IC-MA Datasheet(HTML) 11 Page - IC-Haus GmbH |
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11 / 18 page  iC-MA ANGULAR HALL SENSOR / ENCODER Rev B3, Page 11/18 Analog modes of operation Mode NEN CFG1 CFG2 CFG3 Port A Port B Port C Port D Res. Comment Analog S-Sensor low low low low PSIN VREF PCOS GAIN D-Sensor low open low low PSIN NSIN PCOS NCOS PRM D-Sensor low high low low PSIN NSIN PCOS NCOS In the analog modes of operation the amplified Hall voltages are available at the output ports. The sine/ cosine output signals are controlled to have stable am- plitudes of 1 V and referenced to a DC value equivalent to half of the supply voltage (VREF). Due to the inter- nal signal conditioning unit, no special adjustment is required. An externally connected interpolator can be used if further trimming of the output signals is desired. 0 100 200 300 400 500 600 700 0 1 2 3 4 5 Time [µs] NCOS GAIN PCOS PSIN NSIN VREF Figure 7: Analog mode output signals after switch- ing on the device S sensor mode After the device has been activated via NEN = low the sensor is set to its operating point. All signals are ref- erenced to half the supply voltage (VREF). In S sen- sor mode this potential is available at port B. Ports A and C output the sine and cosine Hall voltages set to 2 Vss. The angle can be calculated from the relation of the sine voltage (difference in voltage PSIN to VREF) to the cosine voltage (difference in voltage PCOS to VREF). The device supplies an angle which remains non-ambiguous over a 360° rotation of the permanent magnet. Signal GAIN allows conclusions to be drawn as to the operating point of the sensor. This is influenced by the amplitude of the magnetic field, the sensor supply voltage and temperature. The higher the GAIN poten- tial, the greater the necessary amplification of the Hall voltages; the external magnetic field is smaller. Be- sides recording the direction of magnetization of the permanent magnet the distance between the magnet and sensor may also be assessed using the GAIN sig- nal. If the gain is insufficient to boost the Hall voltages to 2 Vss the amplitude control reaches its upper limit and the output amplitude becomes smaller. The GAIN signal can be used to adjust the permanent magnet. If the central point of both the magnet and sensor iC-MA are the same the GAIN signal has no harmonics. A misaligned sensor must readjust the op- erating point depending on the angle; the GAIN signal varies in amplitude. To adjust the sensor to the magnet this must be shifted along its X- and Y-axis so that the GAIN signal has to readjust as little as possible. D sensor mode In D sensor mode differential sine (pin A and pin B) and cosine (pin C and pin D) signals are supplied at the out- put; as opposed to S sensor mode inverted Hall signals are now also available at the ports. The advantage of this mode of operation is the doubled signal amplitude of the differential Hall voltages and the lack of depen- dence on reference voltage VREF. The angle is now calculated via the ratio of the difference between PSIN and NSIN and between PCOS and NCOS. D sensor mode is also available with a reduced power consumption (PRM or Power Reduced Mode). In this mode the Hall sensor is supplied with current less fre- quently, reducing the power consumption. Here it must be observed that the maximum rotating frequency also drops by a factor of 2. |
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