ATS657 查看數據表（PDF） - Allegro MicroSystems

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ATS657

Dynamic, Self-Calibrating, Threshold-Detecting, Differential Speed and Direction Hall-Effect Gear Tooth Sensor IC

Allegro MicroSystems 

ATS657

Dynamic, Self-Calibrating, Threshold-Detecting, Differential

Speed and Direction Hall-Effect Gear Tooth Sensor IC

Start-Up Detection

After the power-on time is complete, the ATS657 internally

detects the profile of the target. The output becomes active at the

first detected switchpoint. Figure 3 shows where the first output

pulse occurs for various starting target phases. After calibration is

complete, direction information is available and this information

is communicated through the output pulse width.

Forward Target Rotation (Target passes from pin 4 to pin 1)

Valley

Tooth

Target Differential

Magnetic Profile

tw(ND)

Power-on

opposite valley

tw(ND)

IC Output

Power-on opposite

rising edge

tw(ND)

Power-on

opposite tooth

t

Power-on opposite

falling edge

Device Location at Power-On

Figure 3. Start-up position effect on first device output switching

Allegro MicroSystems, Inc.

8

115 Northeast Cutoff

Worcester, Massachusetts 01615-0036 U.S.A.

1.508.853.5000; www.allegromicro.com

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