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DRV5011 Arkusz danych(PDF) 12 Page - Texas Instruments

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Numer części DRV5011
Szczegółowy opis  Low-Voltage, Digital-Latch Hall Effect Sensor
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Producent  TI1 [Texas Instruments]
Strona internetowa  http://www.ti.com
Logo TI1 - Texas Instruments

DRV5011 Arkusz danych(HTML) 12 Page - Texas Instruments

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VCC
Controller
DRV5011
VCC
GND
OUT
DRV5011
VCC
GND
OUT
N
S
N
S
VCC
VCC
GPIO
GPIO
Copyright © 201 7, Texas Instrumen ts Incorpor ate d
12
DRV5011
SLVSCY6 – DECEMBER 2017
www.ti.com
Product Folder Links: DRV5011
Submit Documentation Feedback
Copyright © 2017, Texas Instruments Incorporated
8.2.2 Incremental Rotary Encoding Application
Figure 14. Incremental Rotary Encoding System
8.2.2.1 Design Requirements
For this design example, use the parameters listed in Table 2.
Table 2. Design Parameters
DESIGN PARAMETER
EXAMPLE VALUE
RPM range
0 to 45 k
Number of magnet poles
8
Magnetic material
Ferrite
Air gap above the Hall sensors
2.5 mm
Magnetic flux density peaks at the Hall
sensors at maximum temperature
±7 mT
8.2.2.2 Detailed Design Procedure
Incremental encoders are used on knobs, wheels, motors, and flow meters to measure relative rotary movement.
By attaching a ring magnet to the rotating component and placing a DRV5011 nearby, the sensor generates
voltage pulses as the magnet turns. If directional information is also needed (clockwise versus counterclockwise),
a second DRV5011 can be added with a phase offset, and then the order of transitions between the two signals
describes the direction.
Creating this phase offset requires spacing the two sensors apart on the PCB, and an ideal 90° quadrature offset
is attained when the sensors are separated by half the length of each magnet pole, plus any integer number of
pole lengths. Figure 14 shows this configuration, as the sensors are 1.5 pole lengths apart. One of the sensors
changes its output every 360° / 8 poles / 2 sensors = 22.5° of rotation. For reference, TI Design TIDA-00480,
Automotive Hall Sensor Rotary Encoder, uses a 66-pole magnet with changes every 2.7°.
The maximum rotational speed that can be measured is limited by the sensor bandwidth. Generally, the
bandwidth must be faster than two times the number of poles per second. In this design example, the maximum
speed is 45000 RPM, which involves 6000 poles per second. The DRV5011 sensing bandwidth is 30 kHz, which
is five times the pole frequency. In systems where the sensor sampling rate is close to two times the number of
poles per second, most of the samples measure a magnetic field that is significantly lower than the peak value,
because the peaks only occur when the sensor and pole are perfectly aligned. In this case, add margin by
applying a stronger magnetic field that has peaks significantly higher than the maximum BOP.


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