SM3600AP

SEIKO NPC CORPORATION - 7

Operating Procedure

under conditions of stable magnetic field near the SM3600AP. Bias voltage correction is then performed for 1 ms (max) using the auto bias

Timing diagram

Auto-Bias Function

The auto-bias function corrects the bias voltage of the internal amplifier of the SM3600AP to set the DC output voltage of the magnetic

The auto-bias function starts when the SET pin is switched from LOW to HIGH. The bias voltage of the internal amplifier is automatically

the OUT pin.

The SM3600AP is sensitive to changes in magnetic field, including the geomagnetic field. The auto-bias function should be used at regular

intervals if the magnetic field near the sensor modules changes or if the sensor is used continuously for extended periods. To start the

auto-bias function, switch the SET pin LOW and then HIGH again.

Standby Mode

Switch the CE pin to LOW to enter standby mode (state 1). In this mode, the OUT pin output is at VSS level and the current consumption

falls to 100 µA(typ). When restarting operation from standby mode, always run the auto-bias function after switching the CE pin to HIGH.

detected signal

VDD

CE

SET

OUT

VREF

state 1

state 2

state 3

state 4

≧

required 100µs

maximum1ms

state 1: Standby mode

state 2: Before the auto-bias function starts

state 3: Auto-bias function in progress

state 4: Normal operation