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A1351 Schematic ( PDF Datasheet ) - Allegro MicroSystems

Teilenummer A1351
Beschreibung High Precision Linear Hall Effect Sensor IC
Hersteller Allegro MicroSystems
Logo Allegro MicroSystems Logo 




Gesamt 24 Seiten
A1351 Datasheet, Funktion
A1351
High Precision Linear Hall Effect Sensor IC
with a Push/Pull, Pulse Width Modulated Output
Discontinued Product
This device is no longer in production. The device should not be
purchased for new design applications. Samples are no longer available.
Date of status change: April 30, 2012
Recommended Substitutions:
For existing customer transition, and for new customers or new appli-
cations, contact Allegro Sales.
NOTE: For detailed information on purchasing options, contact your
local Allegro field applications engineer or sales representative.
Allegro MicroSystems, Inc. reserves the right to make, from time to time, revisions to the anticipated product life cycle plan
for a product to accommodate changes in production capabilities, alternative product availabilities, or market demand. The
information included herein is believed to be accurate and reliable. However, Allegro MicroSystems, Inc. assumes no respon-
sibility for its use; nor for any infringements of patents or other rights of third parties which may result from its use.






A1351 Datasheet, Funktion
A1351
High Precision Linear Hall Effect Sensor IC
with a Push/Pull, Pulse Width Modulated Output
OPERATING CHARACTERISTICS (continued) valid over full operating temperature range, TA; CBYPASS = 0.1 μF, VCC = 5 V, unless otherwise specied
Characteristic
Symbol
Test Conditions
Min. Typ. Max. Units
Drift Characteristics
Maximum Sensitivity Drift Through
Temperature Range14
SensTC
– < ±2 –
%
Sensitivity Drift Due to Package Hysteresis1
Error Components
SensPKG TA = 25°C, after temperature cycling
– < ±1 –
%
Linearity Sensitivity Error15
LinERR
B = 400 G and 200 G, and
B = – 400 G and – 200 G
– < ±0.5 –
%
Symmetry Sensitivity Error16
SymERR B = ±300 G
– < ±1 –
%
1 See Characteristic Definitions section.
2 fC varies up to approximately ±20% over the full operating ambient temperature range, TA, and process.
3 Measured as 10% to 90% (or 90% to 10%) of the PWM signal.
4 Jitter is dependent on the sensitivity of the device.
5 Raw device characteristic values before any programming.
6 Bit for selecting between D(Q)UNI and D(Q)BI programming ranges.
7 D(Q)(max) is the value available with all programming fuses blown (maximum programming code set). The D(Q) range is the total range from
D(Q)(init) up to and including D(Q)(max). See Characteristic Definitions section. Quiescent Duty Cycle may drift by an additional –0.8% D to 0.3% D over the lifetime of this
product.
8 Step size is larger than required, in order to provide for manufacturing spread. See Characteristic Definitions section.
9 Non-ideal behavior in the programming DAC can cause the step size at each significant bit rollover code to be greater than twice the maximum
specified value of StepD(Q), StepSENS, or StepfPWM.
10 Overall programming value accuracy. See Characteristic Definitions section.
11 Sens(max) is the value available with all programming fuses blown (maximum programming code set). Sens range is the total range from Sensinit up
to and including Sens(max). See Characteristic Definitions section. Sensitivity may drift by an additional ±2.5% over the lifetime of this product.
12 Programmed at 125°C and calculated relative to 25°C.
13 PWM Carrier Frequency may drift by an additional ±17 Hz over the lifetime of this product.
14 Sensitivity drift from expected value at TA after programming TCSENS. See Characteristic Definitions section.
15 Linearity is only guaranteed for output duty cycle ranges of ±40% D from the quiescent output for bidirectional devices and +40% D from the quiescent output for
unidirectional devices. These linearity ranges are only valid within the operating output range of the device. The operating output range is confined to the region between the
output clamps. Linearity may shift by up to ±0.25% over the lifetime of this product.
16 Symmetry error is only valid for bipolar devices. Symmetry may shift by up to ±0.6% over the lifetime of this product.
Allegro MicroSystems, Inc.
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
5

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A1351 pdf, datenblatt
A1351
High Precision Linear Hall Effect Sensor IC
with a Push/Pull, Pulse Width Modulated Output
A1351 Calibration Test Mode
In customer applications the PWM interface circuitry (body con-
trol module; BCM in figure 12) and the A1351 may be powered
via different power and ground circuits. As a result, the ground
reference for the A1351 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 A1351 and the BCM can result in variations in the threshold
voltage used to measure the duty cycle of the A1351. 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 13.
The A1351 Output Calibration mode is used to compensate for
this error in the duty cycle. While the A1351 is in Output Calibra-
tion mode, the device output waveform is a fixed 50% duty cycle
(the programmed quiescent duty cycle value) regardless of the
applied external magnetic field. After powering-up, the 1351 out-
puts its quiescent duty cycle waveform for 800 ms, regardless of
the applied magnetic field (see figure 14). This allows the BCM
to compare the measured quiescent duty cycle with an ideal 50%
duty cycle.
This test period allows end users to compensate for any threshold
errors that result from a difference in system ground potentials.
Figure 12. In many applications the A1351 may be powered using a different ground
reference than the BCM. This may cause the ground reference for the A1351 (GND 1)
to differ from the ground reference of the BCM (GND 2) by as much as to ± 0.5 V.
Figure 13. 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.
Allegro MicroSystems, Inc.
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
11

12 Page





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