HAL856 Datasheet, PDF (27/42 Pages) Micronas – Programmable Linear Hall-Effect Sensor with Arbitrary Output Characteristic (2-Wire)

DATA SHEET
HAL 856
3.7. Magnetic Characteristics
at T_J = −40 °C to +170 °C, V_DD = 4.5 V to 14 V, after programming and locking of the device,
at Recommended Operation Conditions if not otherwise specified in the column “Conditions”.
Typical Characteristics for T_J = 25 °C and V_DD = 5 V.
For all other temperature ranges this table is also valid, but only in the junction temperature range defined by the
temperature range (Example: For K-Type this table is limited to T_J = −40 °C to +140 °C).
Symbol
B_Offset
ΔB_Offset/ΔT
Δα
NL_SB(T)
Parameter
Pin No.
Magnetic Offset
3
Magnetic Offset Change
due to T_J
Error of Linear Temperature
Coefficient of Magnetic Sensitivity
Integral Non-Linearity of
Temperature Dependence of
Sensitivity
Min.
−1
−15
−400
−
−
B_Hysteresis
Magnetic Hysteresis
−20
Typ.
0
0
0
1
2
0
Max.
1
15
400
−
−
20
Unit
mT
μT/K
Conditions
B = 0 mT, T_J = 25 °C
B = 0 mT
ppm/K TC and TCSQ suitable for the
application
%
α < 2000 ppm/K
%
α >= 2000 ppm/K
TC and TCSQ suitable for the
application
μT
Range = 30 mT, Filter = 500 Hz
Definition of Sensitivity Errors over Temperature
A ideal Hall-effect device would not be affected by
temperature. Its temperature compensation would
allow to compensate for a linear temperature coeffi-
cient α_IDEAL of a permanent magnet.
S_IDEAL = 1 + α_IDEAL × (T – T₀)
The temperature dependence of the sensitivity of a
real sensor is not ideally linear. Its linear temperature
coefficient α is determined by a linear least square fit.
S_B = S₀ × (1 + α × (T – T₀) + res(T))
S₀ and α are the fit parameters, res(T) the residual error.
Micronas specifies two sensitivity errors over
temperature:
1. the error of the linear temperature coefficient α:
Δα = α – α_IDEAL
2. the maximum residual error over temperature
resulting from the least square fit, i.e., the integral
non-linearity of the temperature dependence of sen-
sitivity:
NL_SB(T) = max_T res(T)
Micronas
March 23, 2010; DSH000142_002EN
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