Vicom Systems FC-FC3 Manual do Utilizador descarregar pdf (Página 40)

CONFIDENTIAL [AK8999A/AW/AD]

MS1600-E-00 2014/05

- 40 -

7) The Initial State Setup of VOUT pin, DET1 pin and DET2 pin at Power-Up

To make the Pressure Threshold Detectors generate the correct result at power up, the initial state of VOUT pin,

and the output polarity and the detection direction of the Pressure Threshold Detectors must be set by

EEPROM (EVOUT[1:0], EINV1[0], EIN1L[0], EINV2[0], EIN2L[0]).

The relation between the data in EEPROM and the output waveform of VOUT pin, DET1 pin and DET2 pin is

explained in the following figures.

7.1) Detection Conditions: EIN1L[0]=EIN2L[0]=EINV1[0]=0h, EINV2[0]=1h, EVOUT[1:0]=0h

7.2) Detection Conditions: EIN1L[0]=EIN2L[0]=1h, EINV1[0]=0h, EINV2[0]=1h, EVOUT[1:0]=1h

DET1 pin

DET1 state

High

Low

nitial

state

Detection result

VDD

VOUT pin

VOUT state

Normal output

Detection threshold

VDD

VOUT pin

Detection threshold

Normal output

VSS

DET2 pin

High

Low

VOUT state

Initial

state

Detection result

DET2 state

unknown

(VDD 1V)

unknown

(VDD 1V)

VSS

unknown

(VDD 1V)

unknown

(VDD 1V)

DET1 pin

DET1 state

Low

Initial state

Detection result

VDD

VOUT pin

VOUT state

Normal output

VDD

Detection threshold

DET2 pin

DET2 state

High

Detection result

VDD

VOUT pin

VOUT state

Normal output

VDD

Detection threshold

unknown

(VDD 1V)

unknown

(VDD 1V)

unknown

(VDD 1V)

unknown

(VDD 1V)

Initial state

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