APX9132 Datasheet, PDF (6/11 Pages) Anpec Electronics Coropration – Hall Effect Micro Switch IC

APX9132
Function Description
Operation
The output of APX9132 switches low (turns on) when
in pres ence of strong flux density facing the marked
side of package exceeds the operate point B_OPS (or is
less than B_OPN). After turn-on, the output is capable of
sinking up to 1mA and the output voltage is low (turns
on). In absence of flux density below the release point
B_RPS (or increased above B_RPN), the APX9132 output
switc hes high (turns off). After turn-off, the output is
capable of sourcing up to 1mA and the output voltage
is high (turns off). The difference in the magnetic oper-
ated and released point is the hysteresis (B_hys) of the
device. This built-in hysteresis allows clean switching
of the output even in t he pres ence of ext ernal me-
chanical bouncing vibration and electrical noise.
5V
MAX
OUTPUT OFF
B_OPN
B_OPS
Pole-independent
The pole-independent sens ing technique allows for
operat ion with either a north or south pole magnet
orientat ion, enhancing t he manufacturabilit y of t he
device. The stat e-of-the-art technology provides the
same output polarity for either pole in presence.
Awake & Sleep
Internal awake & sleep timing block circuit activates
the sensor for 180 us and deac tivates it for t he re-
mainder of the period (60 ms). A short “awake” time
allows for stabilizat ion prior t o the sensor sampling
and data latching on the falling edge of the timing pulse.
While in sleep cycle the output is latched in its previ-
ous state.
Chopper Stabilized Technique
The chopper stabiliz ed technique cancels t he mis-
matching of the hall element, the amplifier offset volt-
age and temperature sensitive drift by the dynamic
offset cancellation and switched capacitor technique.
This technique produces devices have an extremely
st able Hall output voltage, therefore t he magnet ic
switch points are stable.
B_RPN
B_{RPS OUTPUT ON}
0
-B
0
+B
MAGNETIC FLUX
Application Information
It is strongly recommended that an ex ternal bypass
capacit or be connect ed (in close to the Hall sensor)
bet ween the s upply and ground of the devic e to re-
duce both external noise and noise generated by the
chopper-stabilization technique. This is especially true
due to the relatively high impedance of battery supplies.
C opyright © ANPEC Electronics C orp.
6
Rev. A.1 - Nov., 2005
www.anpec.com.tw