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參數(shù)資料
| 型號： | A1354KKTTN-T |
| 元件分類： | 磁阻傳感器 |
| 英文描述： | MAGNETIC FIELD SENSOR-HALL EFFECT, RECTANGULAR, THROUGH HOLE MOUNT |
| 封裝： | LEAD FREE, PLASTIC, SIP-4 |
| 文件頁數(shù)： | 13/22頁 |
| 文件大?。?/td> | 531K |
| 代理商： | A1354KKTTN-T |
The Calibration Test mode is provided so that the user can com-
pensate for differences in the ground potential between the A1354
and any interface circuitry used to measure the pulse width of the
A1354 output. This test mode is optional and must be enabled
by blowing its programming bit. After the test mode bit has been
blown, the device enters Calibration Test mode every time the
device is powered-up.
In customer applications the PWM interface circuitry (body con-
trol module: BCM in figure 7) and the A1354 may be powered
via different power and ground circuits. As a result, the ground
reference for the A1354 may differ from the ground reference of
the BCM. In some customer applications this ground difference
can be as large as ± 0.5 V.
Differences in the ground reference for the A1354 and the BCM
can result in variations in the threshold voltage used to measure
the duty cycle of the A1354. If the PWM conversion threshold
voltage varies, then the duty cycle will vary because there is a
finite rise time, tr, and fall time, tf, in the PWM waveform. This
problem is shown in figure 8.
The Calibration Test mode allows end users to compensate
for any threshold errors that result from a difference in system
ground potentials. While the A1354 is in the test period, the
Calibration Test Mode
V
OH
V
OL
Figure 8. When the threshold voltage is correctly centered between VOH and VOL, the duty cycle accurately coincides with the
applied magnetic field. If the threshold voltage is raised, the output duty cycle appears shorter than expected. Conversely, if
the threshold voltage is lowered, the output duty cycle is longer than expected.
GND
GND1
A1354
BCM
VCC
1
4
VCC
CBYPASS
GND2
10 nF
4.7 kΩ
CL
Figure 7: In many applications the A1354 may be powered using a different ground
reference than the BCM. This may cause the ground reference for the A1354 (GND 1) to
differ from the ground reference of the BCM (GND 2) by as much as to ±0.5 V.
High Precision 2-Wire Linear Hall Effect Sensor IC
with Pulse Width Modulated Output
A1354
20
Allegro MicroSystems, Inc.
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
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參數(shù)描述 |
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| A1354P1-6 | 功能描述:SWITCH HARDWARE RoHS:是 類別:開關(guān) >> 配件 系列:- 標(biāo)準包裝:100 系列:- 其它名稱:886.0007886.0007-ND |
| A1354P2-4 | 制造商:APEM 功能描述: |
| A1354P2-5 | 功能描述:SWITCH HARDWARE RoHS:是 類別:開關(guān) >> 配件 系列:- 標(biāo)準包裝:100 系列:- 其它名稱:886.0007886.0007-ND |
| A1355P1-2 | 制造商:APEM 功能描述: |
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