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參數(shù)資料
| 型號(hào)： | A1642LKTN-I2-T |
| 元件分類： | 磁阻傳感器 |
| 英文描述： | MAGNETIC FIELD SENSOR-HALL EFFECT, 3-100mT, RECTANGULAR, THROUGH HOLE MOUNT |
| 封裝： | LEAD FREE, SIP-4 |
| 文件頁數(shù)： | 13/13頁 |
| 文件大?。?/td> | 326K |
| 代理商： | A1642LKTN-I2-T |
9
A1642LK-DS
Worcester, Massachusetts 01615-0036 (508) 853-5000
115 Northeast Cutoff, Box 15036
www.allegromicro.com
Allegro MicroSystems, Inc.
Two-Wire True Zero-Speed Miniature Differential Peak-Detecting Sensor with Continuous Calibration
A1642LK
Automatic Gain Control (AGC)
This feature allows the device to operate with an optimal internal
electrical signal, regardless of the air gap (within the AG speci-
cation). During calibration, the device determines the peak-to-
peak amplitude of the signal generated by the target. The gain of
the sensor is then automatically adjusted. Figure 5 illustrates the
effect of this feature.
Automatic Offset Adjust (AOA)
The AOA is patented circuitry that automatically compensates
for the effects of chip, magnet, and installation offsets. (For
capability, see Dynamic Offset Cancellation, in the Operat-
ing Characteristics table.) This circuitry is continuously active,
including both during calibration mode and running mode, com-
pensating for any offset drift. Continuous operation also allows it
to compensate for offsets induced by temperature variations over
time.
Digital Peak Detection
A digital DAC tracks the internal analog voltage signal VPROC,
and is used for holding the peak value of the internal analog
signal. In the example shown in gure 6, the DAC would rst
track up with the signal and hold the upper peak’s value. When
VPROC drops below this peak value by BOP, the device hyster-
esis, the output would switch and the DAC would begin tracking
the signal downward toward the negative VPROC peak. Once the
DAC acquires the negative peak, the output will again switch
states when VPROC is greater than the peak by the value BRP. At
this point, the DAC tracks up again and the cycle repeats. The
digital tracking of the differential analog signal allows the sensor
to achieve true zero-speed operation.
Figure 5. Automatic Gain Control (AGC). The AGC function corrects for
variances in the air gap. Differences in the air gap affect the magnetic
gradient, but AGC prevents that from affecting device performance, as
shown in the lowest panel.
N
S
AGSmall
AGLarge
AGSmall
AGLarge
Internal Differential
Analog Signal
Response, with AGC
Internal Differential
Analog Signal
Response, without AGC
V+
Target
Ring Magnet
Figure 6: Peak Detecting Switchpoint Detail
Device
Output Current
BRP
Internal
Differential
Analog Signal
V+
I+
BOP
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