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參數(shù)資料
| 型號(hào)： | A3054 |
| 廠商： | Allegro MicroSystems, Inc. |
| 英文描述： | Multiplexed Two-Wire Hall Effect Sensor(多路復(fù)用2線霍爾效應(yīng)傳感器) |
| 中文描述： | 復(fù)用兩線霍爾效應(yīng)傳感器（多路復(fù)用2線霍爾效應(yīng)傳感器） |
| 文件頁數(shù)： | 4/12頁 |
| 文件大?。?/td> | 87K |
| 代理商： | A3054 |
3054
MULTIPLEXED
TWO-WIRE
HALL-EFFECT SENSOR ICs
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
A device may be addressed by changing the supply
voltage as shown in Figure 1. A preferred addressing
protocol is as follows: the bus supply voltage is brought
low (<2.5 V) so that all devices on the bus are reset. The
voltage is then raised to the address LOW voltage (V
L
) and
the bus quiescent current is measured. The bus is then
toggled between V
L
and V
H
(address HIGH voltage), with
each positive transition representing an increment in the
bus address. After each voltage transition, the bus current
may be monitored to check for diagnostic and signal
responses from sensor ICs.
Sensor Addressing
When a sensor detects a bus address equal to its
factory-programmed address, it responds with an increase
in its supply current drain ( I
S
) during the next HIGH portion
ADDRESSING PROTOCOL
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 been
switched ON. When a device is deactivated by changing
the bus address, all magnetic memory is lost.
Magnetic Hysteresis (B
HYS
)
Difference between the B
OP
and B
RP
magnetic field
thresholds.
FIGURE 1
BUS TIMING
SAND SIGNAL CURRENTS
DIAGNOSTIC
DIAGNOSTIC
DIAGNOSTIC
DIAGNOSTIC
ADDRESS
n
RESET
ADDRESS 01
SENSOR 02 —
DIAGNOSTIC
SENSOR 01
VH
VL
VRST
0
IS
IQL
IQH
0
IS
0
IS
n IQL
n IQH
0
tphl
tplh
VCLH
VCHL
Dwg. WH-005
BUS
VOLTAGE
SENSOR 02
WITH NO
MAGFIELD
SCURRENT
MAGFIELD
BUS CUTWITH
MAGNETIC
SEFIELD AT
RESET
IQL
IQH
SENSOR 01
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