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High Precision, Output Pin Programmable
Linear Hall Effect Sensor ICs
A1373 and
A1374
20
Allegro MicroSystems, Inc.
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
" A bypass capacitor rated at 0.1糉 must be mounted between the
VOUT pin and the GND pin during programming. The power
supply used for programming should be capable of delivering 28
V and 300 mA.
" Before beginning any Blow Fuse mode or Lock Device mode
code sequence, the device MUST be reset by cycling V
CC
 power-
off and power-on again. Cycling power resets the device by set-
ting all bitfields that have intact fuses to 0. Bitfields with blown
fuses are unaffected.
In Try Value mode, to retain register settings from previous code
sequences, do not cycle power between sequences.
When a register is selected in Register Selection mode, when
the V
PH
 pulse is sent to enter the Bitfield Selection mode, the
bitfields with intact fuses in that register are reset to 0.
" In Try Value mode, all bits in the register can be set in one code
sequence. For example, setting the binary value 0110 and sending
a V
PH
 pulse sets code 6. However, because of the power require-
ment, blowing fuses in Blow Fuse mode must be performed one
bitfield at a time. In order to program (blow fuses) for binary
0110, the bitfields MUST be programmed (blown) in two differ-
ent code sequences:one setting the 0100 bit, and the other setting
the 0010 bit (in either order). Power must be cycled before each
of the two sequences.
" Although a bitfield cannot be reset once its fuse is blown,
additional bitfields can be blown at any time, until the device is
locked by setting the Lock bit. For example, if bit 1 (0010) has
been blown, it is possible to blow bit 0 (0001). Because bit 1 was
already blown, the end result will be 0011 (code 3).
" Before powering down the device after programming, observe
the recommended delay at the mid voltage level, to ensure that
the last V
PH
 pulse has decayed before voltage drops to the V
PL
 
voltage. This will avoid the generation of overlapping V
PL
 and
V
PH
 pulses. At the end of a Lock Device mode code sequence,
the delay is not necessary.
" Programming order is important in both Try Value mode and
in Blow Fuse mode. There will be a slight parametric shift in
sensitivity after programming the temperature coefficient, and a
slight quiescent voltage shift with polarity. Subsequent changes to
sensitivity can cause a shift in the quiescent output voltage.
The following order is recommended:
a.    Polarity
b.    TC Register
c.    Sens Coarse
d.    QVO Coarse
e.    Sens Fine
g.    QVO Fine
The Clamp Bit register can be programmed at any point in the
order, as no parametric shift is observed due to clamps.
" The actual distribution of parametric programming ranges are
wider than the specified programming ranges, in order to take
in to account manufacturing spread. The maximum possible
attainable range can be used with the understanding that other
specified parameters might be out of datasheet specification in
the extended range. (For an example, see the chart Sensitivity
Temperature Coefficient Range, in the Typical Characteristics
section.)
Programming Guidelines
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A1374EKBTI-T 制造商:ALLEGRO 制造商全称:Allegro MicroSystems 功能描述:High Precision, Output Pin Programmable Linear Hall Effect Sensors
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A1374LKBTI 制造商:ALLEGRO 制造商全称:Allegro MicroSystems 功能描述:High Precision, Output Pin Programmable Linear Hall Effect Sensors
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