DRV5023_16 Datasheet, PDF (18/28 Pages) Texas Instruments – Digital-Switch Hall Effect Sensor

DRV5023
SLIS151E – MAY 2014 – REVISED FEBRUARY 2016
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8.2.2 Alternative Two-Wire Application
For systems that require minimal wire count, the device output can be connected to V_CC through a resistor, and
the total supplied current can be sensed near the controller.
R1
+
OUT ₂ VCC ₁
±
GND ³
C1
Current
sense
Controller
Figure 22. 2-Wire Application
Current can be sensed using a shunt resistor or other circuitry.
8.2.2.1 Design Requirements
Table 4 lists the related design parameters.
Table 4. Design Parameters
DESIGN PARAMETER
Supply voltage
OUT resistor
Bypass capacitor
Current when B < B_RP
Current when B > B_OP
REFERENCE
V_CC
R1
C1
I_RELEASE
I_OPERATE
EXAMPLE VALUE
12 V
1 kΩ
0.1 µF
About 3 mA
About 15 mA
8.2.2.2 Detailed Design Procedure
When the open-drain output of the device is high-impedance, current through the path equals the I_CC of the
device (approximately 3 mA).
When the output pulls low, a parallel current path is added, equal to V_CC / (R1 + r_DS(on)). Using 12 V and 1 kΩ,
the parallel current is approximately 12 mA, making the total current approximately 15 mA.
The local bypass capacitor C1 should be at least 0.1 µF, and a larger value if there is high inductance in the
power line interconnect.
9 Power Supply Recommendations
The DRV5023 device is designed to operate from an input voltage supply (VM) range between 2.5 and 38 V. A
0.01-µF (minimum) ceramic capacitor rated for V_CC must be placed as close to the DRV5023 device as possible.
18
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