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A3054SU Datasheet(PDF) 3 Page - Allegro MicroSystems |
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A3054SU Datasheet(HTML) 3 Page - Allegro MicroSystems |
3 / 12 page 3054 MULTIPLEXED TWO-WIRE HALL-EFFECT SENSOR ICs FUNCTIONAL BLOCK DIAGRAM SENSOR LOCATION ( ±0.005” [0.13 mm] die placement) CLOCK Dwg. FH-009 BUS SWITCH IN (OPTIONAL) GROUND CMOS LOGIC REG COMP COMP RESET 1 3 2 1 3 2 Dwg. MH-002-10A 0.015" 0.38 mm NOM BRANDED SURFACE ACTIVE AREA DEPTH 0.073" 1.85 mm A 0.090" 2.29 mm DEFINITION OF TERMS Sensor Address Each bus sensor has a factory-specified predefined address. At present, allowable sensor addresses are integers from 01 to 30. LOW-to-HlGH Clock Threshold (VCLH) 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 that monitors the supply voltage, VBUS. HlGH-to-LOW Threshold (VHL) 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 that monitors the supply voltage, VBUS. Bus HIGH Voltage (VH) Bus HIGH voltage during addressing. Voltage should be greater than VCLH. Address LOW Voltage (VL) Bus LOW voltage during addressing. Voltage should be greater than VRST and less than VCHL. Bus Reset Voltage (VRST) Voltage level while resetting sensors. Sensor Quiescent Current Drain (IQ) The current drain of bus sensors when active but not addressed. IQH is the quiescent current drain when the sensor is not addressed and is at VH IQL is the quiescent current drain when the sensor is not addressed and is at VL. Note that IQL is greater than IQH. Diagnostic Phase Period on the bus when the address voltage is at VH. 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 VL. During this period, a correctly addressed sensor that detects a magnetic field greater than the magnetic oper- ate point, BOP, responds by maintaining a current drain of IS on the bus. This response from the sensor is called the signal response and the bus current is called the signal current. Sensor Address Response Current (IS) Sensor current during the diagnostic and the signal responses of the bus sensor. This is accomplished by enabling an internal constant-current source. |
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