APX9131_09 Datasheet, PDF (6/14 Pages) Anpec Electronics Coropration – Hall Effect Micro Switch IC

APX9131
Function Description
Operation
The output of APX9131 switches low (turns on) when in
presence 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 (or increased
RPS
above B_RPN), the APX9131 output switches high (turns off).
The difference in the magnetic operated and released point
is the hysteresis (B_hys) of the device. This built-in hyster-
esis allows clean switching of the output even in the pres-
ence of external mechanical bouncing vibration and elec-
trical noise.
Chopper Stabilized Technique
The chopper stabilized technique cancels the mismatch-
ing of the hall element, the amplifier offset voltage and
temperature sensitive drift by the dynamic offset cancel-
lation and switched capacitor technique. This technique
produces devices have an extremely stable Hall output
voltage, therefore, the magnetic switch points are stable.
5V
MAX
B_OPN
OUTPUT OFF
B_OPS
B_RPN
B_{RPS OUTPUT ON}
0
-B
0
+B
MAGNETIC FLUX
Pole-Independent
The pole-independent sensing technique allows for op-
eration with either a north or south pole magnet
orientation, enhancing the manufacturability of the device.
The state-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 180µs and deactivates it for the remainder of the
period (60ms). A short “awake” time allows for stabiliza-
tion prior to the sensor sampling and data latching on the
falling edge of the timing pulse. When in sleep cycle, the
output is latched in its previous state.
Copyright © ANPEC Electronics Corp.
6
Rev. A.12 - Aug., 2009
www.anpec.com.tw