APX9131 datasheet(6/14 Pages) ANPEC

6 / 14 page

Rev. A.12 - Aug., 2009

APX9131

www.anpec.com.tw

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

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 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.

Function Description

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.

Operation

OUTPUT OFF

OPN

OPS

RPN

RPS

OUTPUT ON

MAGNETIC FLUX

-B

MAX

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 180

µs 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.

Chopper Stabilized Technique

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