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PDF A1351 Data sheet ( Hoja de datos )
| Número de pieza | A1351 | |
| Descripción | High Precision Linear Hall Effect Sensor IC | |
| Fabricantes | Allegro MicroSystems | |
| Logotipo |  |
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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.
1 page  
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 specified
Characteristic
Symbol
Test Conditions
Min. Typ. Max. Units
Quiescent Duty Cycle Programming
Initial Quiescent Duty Cycle Output
Coarse Quiescent Duty Cycle Output
Programming Bits6
D(Q)UNIinit
D(Q)BIinit
B = 0 G, TA = 25°C
B = 0 G, TA = 25°C
– 19.5 –
– D(Q)PRE –
–1–
%D
%D
bit
Guaranteed Quiescent Duty Cycle Output
Range7
Quiescent Duty Cycle Output Programming
Bits
D(Q)UNI
D(Q)BI
B = 0 G, TA = 25°C
B = 0 G, TA = 25°C
10 – 25 % D
36 – 66 % D
– 9 – bit
Average Quiescent Duty Cycle Output Step
Size8, 9
StepD(Q) TA = 25°C
0.07 0.08 0.09 % D
Quiescent Duty Cycle Output Programming
Resolution10
ErrPGD(Q) TA = 25°C
–
StepD(Q)
× ±0. 5
–
%D
Sensitivity Programming
Initial Sensitivity
Guaranteed Sensitivity Range11
Sensitivity Programming Bits
Sensinit
Sens
TA = 25°C
–
0.055
–
SensPRE
–
8
–
0.095
–
% D/G
% D/G
bit
Average Sensitivity Step Size8,9
Sensitivity Programming Resolution10
StepSENS
ErrPGSENS
TA = 25°C
TA = 25°C
700 785 870 μ% D/G
–
StepSENS
× ±0.5
–
μ% D/G
Carrier Frequency Programming
Guaranteed Carrier Frequency Programming
Range1,13
fPWM
105 125 160 Hz
Carrier Frequency Programming Bits
– 4 – bit
Average Carrier Frequency Step Size8,9
Carrier Frequency Programming Resolution10
StepfPWM
ErrPGfPWM
TA = 25°C
5 6.7 8
StepfPWM
× ±0.5
Hz
Hz
Calibration Test Mode Programming
Calibration Test Mode Selection Bit
CAL
– 1 – bit
Lock Bit Programming
Overall Programming Lock Bit
LOCK
– 1 – bit
Factory Programmed Temperature Coefficients
Sensitivity Temperature Coefficient12
Sensitivity Temperature Coefficient Error
Quiescent Duty Cycle Drift12
Quiescent Duty Cycle Drift Error
TCSens
ErrTCSENS
∆D(Q)
Err∆D(Q)
TA = 125 °C
TA = 125 °C
TA = 125 °C
TA = 125 °C, Sens = SensPRE
–0–
– < ±0.01 –
–0–
– < ±0.2 –
%/°C
%/°C
%D
%D
Continued on the next page…
Allegro MicroSystems, Inc.
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
4
5 Page 
A1351
High Precision Linear Hall Effect Sensor IC
with a Push/Pull, Pulse Width Modulated Output
Symmetry Sensitivity Error The magnetic sensitivity of an
A1351 device is constant for any two applied magnetic fields of
equal magnitude and opposite polarities.
Symmetry error, SymERR (%), is measured and defined as:
SymERR
=
⎛
⎜⎜1–
⎝
SensBPOS
SensBNEG
⎞
⎟⎟ ×100%
⎠
,
(13)
where SensBx is as defined in equation 4, and BPOS and BNEG are
positive and negative magnetic fields such that |BPOS| = |BNEG|.
Note that the symmetry error specification is only valid for bipolar
devices.
Duty Cycle Jitter The duty cycle of the PWM output may vary
slightly over time despite:
• the presence of a constant applied magnetic field, and
• a constant carrier frequency for the PWM signal.
This phenomenon is known as jitter, and is defined as:
JD = ±
%DB(max) – %DB(min)
2
,
(14)
where %DB(max) and %DB(min) are the maximum and mini-
mum duty cycles measured the over 1000 PWM clock periods
with a constant applied magnetic field. JD is given in %D (see
figure below).
Duty Cycle Resolution The ability to know the value of the
applied magnetic field from the device output is affected by jitter.
The resolution of the magnetic field, in Gauss (G), is defined as:
RES =
JDC
Sens
.
(15)
tPERIOD
±Jitter
Jitter is instability or small rapid irregularity about a specific data position in
a periodic electrical signal waveform from cycle to cycle. In this figure, the
A1351 PWM Output jitter is ±0.025% D at 25°C, Sens = 0.095% D/G.
Allegro MicroSystems, Inc.
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
10
11 Page | ||
| Páginas | Total 24 Páginas | |
| PDF Descargar | [ Datasheet A1351.PDF ] | |
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