DRV5023_16 Datasheet, PDF (17/28 Pages) Texas Instruments – Digital-Switch Hall Effect Sensor

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DRV5023
SLIS151E – MAY 2014 – REVISED FEBRUARY 2016
8.2.1.2.1 Configuration Example
In a 3.3-V system, 3.2 V ≤ V_ref ≤ 3.4 V. Use Equation 3 to calculate the allowable range for R1.
V_ref max _{d R1 d} V_ref min
30 mA
100 µA
(3)
For this design example, use Equation 4 to calculate the allowable range of R1.
3.4 V _{d R1 d} 3.2 V
30 mA
100 µA
(4)
Therefore:
113 Ω ≤ R1 ≤ 32 kΩ
(5)
After finding the allowable range of R1 (Equation 5), select a value between 500 Ω and 32 kΩ for R1.
Assuming a system bandwidth of 10 kHz, use Equation 6 to calculate the value of C2.
u ¦_BW +]
1
2S u R1 u C2
(6)
For this design example, use Equation 7 to calculate the value of C2.
2 u 10 kHz
1
2S u R1 u C2
(7)
An R1 value of 10 kΩ and a C2 value less than 820 pF satisfy the requirement for a 10-kHz system bandwidth.
A selection of R1 = 10 kΩ and C2 = 680 pF would cause a low-pass filter with a corner frequency of 23.4 kHz.
8.2.1.3 Application Curves
OUT
OUT
R1 = 10-kΩ pullup
No C2
Figure 19. 10-kHz Switching Magnetic Field
0
R1 = 10-kΩ pullup
C2 = 680 pF
Figure 20. 10-kHz Switching Magnetic Field
-2
-4
-6
-8
-10
-12
-14
100
1000
10000
Frequency (Hz)
R1 = 10-kΩ pullup
C2 = 680 pF
Figure 21. Low-Pass Filtering
100000
D011
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