DATA SHEET
HAL880
Filter
TC-Range [ppm/k]
−3100 to −1800
GROUP
The FILTER bit is bit number 4 of the MODE register; it
defines the −3 dB frequency of the digital low pass
filter.
0
2
1
3
−1750 to −550
−500 to +450 (default value)
+450 to +1000
−3 dB Frequency
500 Hz
FILTER
0
1
1 kHz
TC (5 bit) and TCSQ (3 bit) have to be selected individu-
ally within each of the four ranges. For example: 0 ppm/k
requires TC-Range = 1, TC = 15 and TCSQ = 1.
Bit Time
The BITTIME bit is bit number 5 of the MODE register;
It defines the protocol bit time for the communication
between the sensor and the programmer board.
Sensitivity
The SENSITIVITY register contains the parameter for
the multiplier in the DSP. The Sensitivity is program-
mable between −4 and 4. For VDD = 5 V, the register
can be changed in steps of 0.00049.
Bit Time
BITTIME
1:64 (Typ. 1.75 ms)
1:128 (Typ. 3.5 ms)
0
1
For all calculations, the digital value from the magnetic
field of the D/A converter is used. This digital informa-
tion is readable from the D/A-READOUT register.
ΔVout × 16384
Output Format
---------------------------------------------------------------
SENSITIVITY =
2 × ΔDA-Readout × VDD
The OUTPUTMODE bits are the bits numbers 6 to 7 of
the MODE register.
VOQ
Output Format
OUTPUTMODE
The VOQ register contains the parameter for the
adder in the DSP. VOQ is the output voltage without
external magnetic field (B = 0 mT) and programmable
from −VDD up to VDD. For VDD = 5 V, the register can
be changed in steps of 4.9 mV.
Analog Output (12 bit)
0
TC Register
The temperature dependence of the magnetic sensitiv-
ity can be adapted to different magnetic materials in
order to compensate for the change of the magnetic
strength with temperature. The adaption is done by
programming the TC (Temperature Coefficient) and
the TCSQ registers (Quadratic Temperature Coeffi-
cient). Thereby, the slope and the curvature of the tem-
perature dependence of the magnetic sensitivity can
be matched to the magnet and the sensor assembly.
As a result, the output voltage characteristic can be
fixed over the full temperature range. The sensor can
compensate for linear temperature coefficients ranging
from about −3100 ppm/K up to 1000 ppm/K and qua-
dratic coefficients from about −7 ppm/K² to 2 ppm/K².
The full TC range is separated in the following four
ranges:
Note: If VOQ is programmed to a negative voltage, the
maximum output voltage is limited to:
VOUTmax = VOQ + VDD
Micronas
Feb. 23, 2009; DSH000152_001EN
9
MICRONAS [ MICRONAS ]
