SM3600AP datasheet(7/11 Pages) NPC

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SM3600AP

SEIKO NPC CORPORATION - 7

Operating Procedure

When CE is HIGH and SET is LOW, a VDD/2 DC voltage is output on the OUT pin (state 2). Switch the SET pin from LOW to HIGH

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

function (described below). The VDD/2 DC voltage output is maintained during the correction interval (state 3). After correction finishes,

the magnetic detection signal is output on the VDD/2 reference voltage on the OUT pin (state 4).

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

detection signal to the VDD/2 reference voltage.

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

corrected so that the DC voltage output under the existing magnetic field condition is the VDD/2 reference voltage. After correction is

finished (1 ms max.), the magnetic detection signal amplified by the internal amplifier is superimposed on the VDD/2 reference voltage on

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

Low: VSS

VSS

VDD

SET

OUT

VDD

VREF

VSS

High: VDD

VDD/2

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

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