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UGN3055U Datasheet(PDF) 3 Page - Allegro MicroSystems |
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UGN3055U Datasheet(HTML) 3 Page - Allegro MicroSystems |
3 / 8 page 3055 MULTIPLEXED TWO-WIRE HALL EFFECT SENSOR IC FUNCTIONAL BLOCK DIAGRAM SENSOR LOCATION (±0.005” [0.13 mm] die placement) A 1 3 2 Dwg. MH-002A 0.015" 0.38 mm NOM 0.071" 1.80 mm 0.084" 2.13 mm BRANDED SURFACE ACTIVE AREA DEPTH CLOCK Dwg. FH-009 BUS SWITCH IN (OPTIONAL) GROUND CMOS LOGIC REG COMP COMP RESET 1 3 2 DEFINITION OF TERMS Sensor Address Each bus sensor has a factory-specified predefined address. At present, allowable sensor addresses are integers from 1 to 30. LOW-to-HlGH Clock Threshold (V CLH) Minimum voltage required during the positive-going transition to increment the bus address and trigger a diagnostic response from the bus sensors. This is also the maximum threshold of the on-chip comparator, which monitors the supply voltage, V BUS. HlGH-to-LOW Threshold (V HL) Maximum voltage required during the negative-going transition to trigger a signal current response from the bus sensors. This is also the maximum threshold of the on- chip comparator, which monitors the supply voltage, V BUS. Bus HIGH Voltage (V H) Bus HIGH voltage required for addressing. Voltage should be greater than V CLH. Address LOW Voltage (V L) Bus LOW Voltage required for addressing. Voltage should be greater than V RST and less than VCHL. Bus Reset Voltage (V RST) Voltage level required to reset individual sensors. Sensor Quiescent Current Drain (I Q) The current drain of bus sensors when active but not addressed. I QH is the maximum quiescent current drain when the sensor is not addressed and is at V H. I QL is the maximum quiescent current drain when the sensor is not addressed and is at V L. Diagnostic Phase Period on the bus when the address voltage is at V H. During this period, a correctly addressed sensor responds by increasing its current drain on the bus. This response from the sensor is called the diagnostic response and the bus current increase is called the diagnostic current. Signal Phase Period on the bus when the address voltage is at V L. During this period, a correctly addressed sensor that detects a magnetic field greater than magnetic Operate Point, B OP, responds by maintaining a current drain of I S on the bus. This response from the sensor is called the signal response and the bus current increase is called the signal current. Sensor Address Response Current (I S) Current returned by the bus sensors during the diagnostic and the signal responses of the bus sensors. This is accomplished by enabling the constant current source (CCS). Magnetic Operate Point (B OP) Minimum magnetic field required to switch ON the Hall amplifier and switching circuitry of the addressed sensor. This circuitry is only active when the sensor is addressed. Magnetic Release Point (B RP) Magnetic field required to switch OFF the Hall amplifier and switching circuitry after the output has switched ON. This is due to magnetic memory in the switching circuitry. However, when a device is deactivated by changing the current bus address, all magnetic memory is lost. Magnetic Hysteresis (B HYS) Difference between the B OP and BRP magnetic field thresh- olds. |
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