KMZ10C,112 NXP Semiconductors, KMZ10C,112 Datasheet - Page 26

• Manufacturer Part Number: KMZ10C,112
• Description: IC MAGNETIC FIELD SENSOR SOT195
• Manufacturer: NXP Semiconductors
• Type: Special Purposer

Specifications of KMZ10C,112

• Sensing Range: 2mV/V
• Voltage - Supply: 5 V ~ 10 V
• Output Type: Analog
• Operating Temperature: -40°C ~ 150°C
• Package / Case: SOT-195
• Mounting Style: SMD/SMT
• Maximum Operating Temperature: + 150 C
• Minimum Operating Temperature: - 40 C
• Supply Voltage (min): 5 V
• Supply Voltage (max): 10 V
• Operating Temperature (min): -40C
• Operating Supply Voltage (typ): 5V
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Current - Supply: -
• Current - Output (max): -
• Features: -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant
• Other names: 933698480112; KMZ10C T/R; KMZ10C T/R

Philips Semiconductors
Block 4 (rectification) performs synchronous rectification
of the flipped signal, to recover measured field information.
If R7 = R8 = R9 this block performs alternate
+1 and 1 amplification, depending whether the sensor is
operating with a normal or inverted characteristic. When
the flipping signal is LOW, switch S1 is closed and the
op-amp acts as an inverting amplifier ( 1 amplification); if
the flipping signal is HIGH, then S1 is open and the
amplification is +1 and no modifications are made to the
input signal. With this rectification, the offset-compensated
measured signal is recovered from the original sensor
signal.
Block 5 smoothes the rectified signal so that a single
continuous output signal is generated. As long as a
compensation coil is used, it is recommended that this filter
is also used, to ensure stable operation. If compensation
is not used, then it is possible to use less expensive
components. This block, as well as the rectifier Block 4 can
even be omitted entirely if, for example, the output signal
is then passed to a microcontroller which can easily
perform the rectification and smoothing, especially if it is
also being used to generate the flipping frequency.
The components in Block 6 drive the compensation coil
and ensure that V
current. If the application does not need the highest
accuracy, reduced circuit complexity can be used.
B. F
In this case, Block 3 should be removed.
C. C
If a stabilization magnet or periodic re-setting is used
instead of flipping, then Block 3 (flipping filter), Block 4
(rectifier) and Block 5 (smoothing) can be omitted.
The flipping generation circuitry can also be simplified (by
leaving out C5, R18, and TR1) or omitted if a stabilization
magnet is used.
D. G
The circuitry described above operates with inexpensive
op-amps such as the LM324 and LM532, keeping costs
low. However, this represents just one possible system
solution and, depending on the required functions, further
reductions in cost can be achieved by replacing the
op-amps with transistor solutions. In designs that do not
utilize some blocks in the circuit, such as offset
compensation, this should certainly be considered. A very
simple set-up can be used if a microprocessor is already
available within the system (Fig.28).
1998 Jun 12
Magnetic field sensors
LIPPING CIRCUIT WITH NO OFFSET COMPENSATION
IRCUIT WITH NO FLIPPING COMPENSATION
ENERAL REMARKS
out
is proportional to the compensation
26
Application examples
In this section, we look at three weak field measurement
applications:
1. Electronic compass
2. Earth geomagnetic field compensation in CRTs
3. Traffic detection.
Note: topics related to the measurement of weak currents
are described in detail in Chapter “Current measurement”.
E
A typical application of weak field measurement is that of
the electronic compass. Here, two sensors are aligned in
the same plane but at 90 degrees to one another. This
provides a two dimensional compass, with the sensors
measuring the x- and y-components of the measured
(earth) field.
handbook, halfpage
LECTRONIC COMPASS
Fig.28 Set-up for weak field measurement using a
5 V
5 V
compensation
microprocessor.
flipping
KMZ51
coil
coil
5 V
A
A
D
D
I/O PORT
P
General
MBH622