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參數(shù)資料
| 型號： | A1645LK-I2 |
| 廠商： | Allegro Microsystems Inc |
| 文件頁數(shù)： | 9/14頁 |
| 文件大?。?/td> | 356K |
| 描述： | IC SENSOR HALL EFFECT AC 4-SIP |
| 產(chǎn)品培訓(xùn)模塊： | Current Sensor |
| 標(biāo)準(zhǔn)包裝： | 500 |
| 傳感范圍： | 120mV 跳閘，120mV 釋放 |
| 類型： | 專用型 |
| 電源電壓： | 4 V ~ 24 V |
| 電流 - 電源： | 8.4mA |
| 輸出類型： | 數(shù)字，開路集電極 |
| 工作溫度： | -40°C ~ 150°C |
| 封裝/外殼： | 4-SIP |
| 供應(yīng)商設(shè)備封裝： | 4-SIP |
| 包裝： | 散裝 |
Two-Wire True Zero-Speed Miniature Differential
Peak-Detecting Sensor IC with Continuous Calibration
A1642
9
Allegro MicroSystems, LLC
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
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 device 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,
compensating for 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 V
PROC
,
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 peaks value. When
V
PROC
drops below this peak value by B
OP
, the device hyster-
esis, the output would switch and the DAC would begin tracking
the signal downward toward the negative V
PROC
peak. Once the
DAC acquires the negative peak, the output will again switch
states when V
PROC
is greater than the peak by the value B
RP
. At
this point, the DAC tracks up again and the cycle repeats. The
digital tracking of the differential analog signal allows the device
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
N
S
S
AG
Small
AG
Large
AG
Small
AG
Large
Internal Differential
Analog Signal
Response, with AGC
Internal Differential
Analog Signal
Response, without AGC
V+
V+
Target
Ring Magnet
Figure 6: Peak Detecting Switchpoint Detail
Device
Output Current
B
RP
Internal
Differential
Analog Signal
V+
I+
B
OP
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