True Zero-Speed Low-Jitter High Accuracy
Gear Tooth Sensor IC
ATS625LSG
14
Allegro MicroSystems, Inc.
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
Switchpoints
Switchpoints in the ATS625 are a percentage of the amplitude of
the signal, V
PROC
, after normalization with AGC. In operation,
the actual switching levels are determined dynamically. Two
DACs track the peaks of V
PROC
(see the Update subsection).
The switching thresholds are established at 40% and 60% of the
values held in the two DACs. The proximity of the thresholds
near the 50% level ensures the most accurate and consistent
switching, because it is where the slope of V
PROC
is steepest and
least affected by air gap variation.
The low hysteresis, 20%, provides high performance over vari-
ous air gaps and immunity to false switching on noise, vibration,
backlash, or other transient events.
Figure 8 graphically demonstrates the establishment of the
switching threshold levels. Because the thresholds are established
dynamically as a percentage of the peak-to-peak signal, the effect
of a baseline shift is minimized. As a result, the effects of offsets
induced by tilted or off-center installation are minimized.
Update
The ATS625 incorporates an algorithm that continuously moni-
tors the system and updates the switching thresholds accordingly.
The switchpoint for each edge is determined by the signal result-
ing from the previous two edges. Because variations are tracked
in real time, the device has high immunity to target run-out and
retains excellent accuracy and functionality in the presence of
both run-out and transient mechanical events. Figure 9 shows
how the device uses historical data to provide the switching
threshold for a given edge.
Switching Threshold Levels
At Constant V
PROC
Level
0
100
B
OP
V+
B
RP
Off On Off On
60
40
Figure 8. Switchpoint Relationship to Thresholds.The device switches
when V
PROC
passes a threshold level, B
OP
or B
RP
, while changing in the
corresponding direction: increasing for a B
OP
switchpoint, and decreasing
for a B
RP
switchpoint.
Figure 9. Switchpoint Determination. The two previous V
PROC
peaks are
used to determine the next threshold level: panel A, operate point, and
panel B, release point.
Dynamic B
OP
Threshold Determination
Dynamic B
RP
Threshold Determination
0
100
B
OP
V+
On Off
60
0
100
V+
B
RP
Off On
40
(A)
(B)
发布紧急采购，3分钟左右您将得到回复。
相关PDF资料
ATS627LSGTN-T
IC HALL EFFECT GEAR SENSOR 4-SIP
ATS635LSETN-T
IC SENSOR GEAR TOOTH 4-SIP
ATS643LSHTN-I2-T
IC SENSOR GEAR TOOTH 4-SIP
ATS645LSHTN-I1
IC SENSOR GEAR TOOTH 4-SIP
ATS667LSGTN-T
IC SENSOR GEAR TOOTH 4SIP
ATS674LSETN-LT-T
IC SENSOR GEAR TOOTH 4-SIP
ATS682LSHTN-T
IC HALL EFFECT SENSOR 4SIP
ATS685LSHTN-T
IC HALL EFFECT GEAR SENSOR 4SIP
相关代理商/技术参数
ATS625LSGTN-T3
制造商:ALLEGRO 制造商全称:Allegro MicroSystems 功能描述:True Zero-Speed Low-Jitter High Accuracy Gear Tooth Sensor
ATS627LSG
制造商:ALLEGRO 制造商全称:Allegro MicroSystems 功能描述:True Zero Speed, Low Jitter, High Accuracy Position Sensor IC
ATS627LSGTN-T
功能描述:IC HALL EFFECT GEAR SENSOR 4-SIP RoHS:是 类别:传感器，转换器 >> 磁性 - 霍尔效应，数字式开关，线性，罗盘 (IC) 系列:- 标准包装:1 系列:- 传感范围:20mT ~ 80mT 类型:旋转 电源电压:4.5 V ~ 5.5 V 电流 - 电源:15mA 电流 - 输出（最大）:- 输出类型:数字式，PWM，8.5 位串行 特点:可编程 工作温度:-40°C ~ 150°C 封装/外壳:20-SSOP（0.209"，5.30mm 宽） 供应商设备封装:20-SSOP 包装:Digi-Reel® 其它名称:AS5132-HSST-500DKR
ATS630LSA
制造商:未知厂家 制造商全称:未知厂家 功能描述:Analog IC
ATS630LSB
制造商:未知厂家 制造商全称:未知厂家 功能描述:Analog IC
ATS631LSA
制造商:未知厂家 制造商全称:未知厂家 功能描述:Analog IC
ATS631LSB
制造商:未知厂家 制造商全称:未知厂家 功能描述:Analog IC
ATS632LSA
制造商:Allegro MicroSystems 功能描述:Zero-Speed, Self-Calibrating, Non-Oriented, Hall-Effect Gear-Tooth Sensor Module