APX9131
Function Description
Operation
Pole-independent
The output of APX9131 switches low (turns on) when The pole-independent sensing technique allows for
in presence of strong flux density facing the marked operation with either a north or south pole magnet
side of package exceeds the operate point BOPS (or is orientation, enhancing the manufacturability of the
less than BOPN). After turn-on, the output is capable of device. The state-of-the-art technology provides the
sinking up to 1 mAand the output voltage is low(turns same output polarity for either pole in presence.
on). In absence of flux density belowthe release point
Awake & Sleep
BRPS (or increased above BRPN), the APX9131 output
switcheshigh(turnsoff). The differencein the magnetic Internal awake & sleep timing blockcircuit activatesthe
sensor for 180 usanddeactivates it for theremainder of
operated and released point is the hysteresis (Bhys) of
the device. This built-in hysteresis allows clean the period (60 ms). A short “awake” time allows for
stabilization prior to the sensor sampling and data
latching on the falling edge of the timing pulse. While
in sleep cycle the output is latched in its previous
state.
switching of the output even in the presence of external
mechanical bouncing vibration and electrical noise.
OUTPUT OFF
5V
Chopper Stabilized Technique
BOPN
BOPS
MAX
The chopper stabilized technique cancels the
mismatching of the hall element, the amplifier offset
voltage and temperature sensitive drift by the dynamic
offset cancellation and switched capacitor technique.
This technique produces devices have an extremely
stable Hall output voltage, therefore the magnetic
switch points are stable.
BRPN
BRPS
OUTPUT ON
+B
0
-B
0
MAGNETIC FLUX
Application Information
It is strongly recommended that an external bypass connected a pull-up resistor to a supply voltage which
capacitor be connected (in close to the Hall sensor)
is lower than 5V, connect a 50kW resistor to VDD in
between the supply and ground of the device to reduce
common use.
both external noise and noise generated by the
chopper-stabilization technique. This is especially
true due to the relatively high impedance of battery
supplies.The output is an open drain output, it must be
Copyright ã ANPEC Electronics Corp.
6
www.anpec.com.tw
Rev. A.7 - Sep., 2005
ANPEC [ ANPEC ELECTRONICS COROPRATION ]
