High Precision, Output Pin Programmable
Linear Hall Effect Sensor ICs
A1373 and
A1374
5
Allegro MicroSystems, Inc.
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
CHARACTERISTIC PARAMETERS (continued)
SENSITIVITY TEMPERATURE COEFFICIENT PROGRAMMING over operating temperature range, V
CC
= 5.0 V, unless
otherwise noted
Sensitivity Temperature
Coefficient Range
TC
Sensitivity T/C codes 0 to 11,
minimum (absolute) positive
temperature coefficient attainable
–
0.07
–
%/°C
Sensitivity T/C codes 16 to 27,
minimum (absolute) negative
temperature coefficient attainable
–
–
0.016 – %/°C
Average Sensitivity
Temperature Coefficient Step
Size
4,
5
,
6
Step
TC
T
A
= 150C
–
0.01
–
%/°C
Sensitivity Temperature
Coefficient Programming Bits
––
5
– Bit
ONE-TIME PROGRAMMING
Device Programming Lock Bit
– – 1 – Bit
RATIOMETRY over operating temperature range, V
CC
= 5.0 V, unless otherwise noted
Quiescent Voltage Error
Rat
VOUT(Q)
V
CC
at V
OPERATING
–
±0.25
–%
Sensitivity Error
Rat
SENS
V
CC
at V
OPERATING
–
±1.0
–%
Clamp Error Rat
VOUTCLP
V
CC
at V
OPERATING
–
±1.5
–%
LINEARITY
over operating temperature range, V
CC
= 5.0 V, unless otherwise noted
Positive Linearity Error Lin+ V
CC
at V
OPERATING
–
±0.5
–%
Negative Linearity Error
Lin–
V
CC
at V
OPERATING
–
±0.5
–%
SYMMETRY
over operating temperature range, V
CC
= 5.0 V, unless otherwise noted
Symmetry Error
Sym
V
CC
at V
OPERATING
– V
CC
–
±0.35 –
%
ADDITIONAL CHARACTERISTICS
Sensitivity Drift
9
Sens – – ±2 %
Package Thermal Resistance
R
θJA
1 layer PCB with copper limited to
solder pads; see Allegro web site for
additional thermal information
– 177 –
°C/W
FAULT CONDITIONS
over operating temperature range, V
CC
= 5.0 V, unless otherwise noted
Shorted Output Wire
I
OUTSHT
VOUT pin to VCC pin – – 18 mA
VOUT pin to GND pin – – 4 mA
1
t
PO
does not include t
CLP
, specified in the Quiescent Programming sectio n of this table.
2
Peak to peak value exceeded: 0.3% (6).
3
For A1373, no digital noise is present at the output.
4
Step size is larger than required for the specified range, to take into account manufacturing spread.
5
Individual code step sizes can be greater than 2× larger than the step size at each significant bit rollover.
6
Average fine code step size in a given range = (Output value at highest fine code in the range – Output value at code 0 of the range) / Total quantity of
steps (codes) in the range.
7
Values indicated are valid if any additional magnetic field does not exceed B(kG)= ±2 (V) / Sens (mv/G), after V
OUTCLP
is reached.
8
Program the Sensitivity T/C register before programming Sensitivity Coarse and Sensitivity Fine, due to a worst case shift of ±3% in sensitivity at 25°C
at the maximum values for Sensitivity T/C: Positive T/C and Sensitivity T/C: Negative T/C. The Programming Guidelines section in this document lists a
complete recommended order for programming individual values.
9
Drift due to temperature cycling is due to package effects on the Hall transducer. The stress is reduced when the package is baked. However, it will
recover over time after removal from the bake.
Characteristic Symbol Test Conditions Min. Typ. Max Units
