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参数资料
| 型号： | A1354KKTTN-T |
| 元件分类： | 磁阻传感器 |
| 英文描述： | MAGNETIC FIELD SENSOR-HALL EFFECT, RECTANGULAR, THROUGH HOLE MOUNT |
| 封装： | LEAD FREE, PLASTIC, SIP-4 |
| 文件页数： | 2/22页 |
| 文件大小： | 531K |
| 代理商： | A1354KKTTN-T |
and for unipolar devices as:
D(BPOS) – D(Q)
BPOS
Sens =
,
(5)
where BPOS and BNEG are two magnetic fields with opposite
polarities.
Guaranteed Sensitivity Range The magnetic sensitivity,
Sens, can be programmed around its nominal value within the
sensitivity range limits: Sens(min) and Sens(max). Refer to the
Guaranteed Quiescent Duty Cycle Output Range section for a
conceptual explanation of how value distributions and ranges are
related.
Average Sensitivity Step Size Refer to the Average Qui-
escent Duty Cycle Output Step Size section for a conceptual
explanation.
Sensitivity Programming Resolution Refer to the Quies-
cent Duty Cycle Output Programming Resolution section for a
conceptual explanation.
Guaranteed Carrier Frequency Range The PWM output
signal carrier frequency, fPWM, can be programmed around its
nominal value in fast mode or slow mode.
Average Carrier Frequency Step Size Refer to the Average
Quiescent Duty Cycle Output Step Size section for a conceptual
explanation.
Carrier Frequency Programming Resolution Refer to the
Quiescent Duty Cycle Output Programming Resolution section
for a conceptual explanation.
Sensitivity Temperature Coefficient Device Sensitiv-
ity changes as temperature changes, with respect to its pro-
grammed sensitivity temperature coefficient, TCSENS. TCSENS
is programmed at 125°C, and calculated relative to the nominal
sensitivity programming temperature of 25°C. TCSENS (%/°C) is
defined as:
SensT2 – SensT1
SensT1
T2–T1
1
TCSens =
×100%
,
(6)
where T1 is the nominal Sens programming temperature of 25°C,
and T2 is the TCSENS programming temperature of 125°C. The
expected value of Sens over the full ambient temperature range,
SensEXPECTED(TA), is defined as:
SensT1× [100% +TCSENS (TA –T1)]
SensEXPECTED(TA) =
100 %
(7)
SensEXPECTED(TA) should be calculated using the actual measured
values of SensT1 and TCSENS rather than ideal programming
target values.
Sensitivity Drift Through Temperature Range Second
order sensitivity temperature coefficient effects cause the mag-
netic sensitivity, Sens, to drift from its expected value over the
operating ambient temperature range, TA. For purposes of speci-
fication, the sensitivity drift through temperature range, SensTC,
is defined as:
SensTA – SensEXPECTED(TA)
SensEXPECTED(TA)
SensTC =
×100% .
(8)
Sensitivity Drift Due to Package Hysteresis Package
stress and stress relaxation can cause the device sensitivity at
TA = 25°C to change during and after temperature cycling.
For purposes of specification, the sensitivity drift due to package
hysteresis, SensPKG, is defined as:
Sens(25°C)2 – Sens(25°C)1
Sens(25°C)1
SensPKG =
×100% ,
(9)
where Sens(25°C)1 is the programmed value of sensitivity at
TA = 25°C, and Sens(25°C)2 is the value of sensitivity at TA =
25°C, after temperature cycling TA up to 125°C, down to –40°C,
and back to up 25°C.
Linearity Sensitivity Error The A1354 is designed to provide
a linear output in response to a ramping applied magnetic field.
Consider two magnetic fields, B1 and B2. Ideally, the sensitivity
of a device is the same for both fields, for a given supply voltage
and temperature. Linearity error is present when there is a differ-
ence between the sensitivities measured at B1 and B2.
High Precision 2-Wire Linear Hall Effect Sensor IC
with Pulse Width Modulated Output
A1354
10
Allegro MicroSystems, Inc.
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
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