3054 Datasheet, PDF (3/12 Pages) Allegro MicroSystems – MULTIPLEXED TWO-WIRE HALL-EFFECT SENSOR ICs

3054
MULTIPLEXED
TWO-WIRE
HALL-EFFECT SENSOR ICs
SENSOR LOCATION
(±0.005” [0.13 mm] die placement)
ACTIVE AREA DEPTH
0.015"
0.38 mm
NOM
0.090"
2.29 mm
0.073"
1.85 mm
A
BRANDED
SURFACE 1
2
3
FUNCTIONAL BLOCK DIAGRAM
1 _BUS
COMP
REG
COMP
CLOCK
CMOS LOGIC
RESET
3
SWITCH IN
(OPTIONAL)
Dwg. MH-002-10A
2 GROUND
Dwg. FH-009
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 (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 that
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 that monitors the supply voltage,
V_BUS.
Bus HIGH Voltage (V_H)
Bus HIGH voltage during addressing. Voltage should
be greater than V_CLH.
Address LOW Voltage (V_L)
Bus LOW voltage during addressing. Voltage should
be greater than V_RST and less than V_CHL.
Sensor Quiescent Current Drain (I_Q)
The current drain of bus sensors when active but not
addressed. I_QH is the quiescent current drain when the
sensor is not addressed and is at V_H I_QL is the quiescent
current drain when the sensor is not addressed and is at
V_L. Note that I_QL is greater than I_QH.
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 the magnetic oper-
ate 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 is called the signal
current.
Sensor Address Response Current (I_S)
Sensor current during the diagnostic and the signal
responses of the bus sensor. This is accomplished by
enabling an internal constant-current source.
Bus Reset Voltage (V_RST)
Voltage level while resetting sensors.