Vicom Systems FC-FC3 Bedienungsanleitung PDF herunterladen (Seite 32)

CONFIDENTIAL [AK8999A/AW/AD]

MS1600-E-00 2014/05

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1.5) S/H Circuit Output Error Adjustment

The S/H circuit output voltage is adjusted to become 0.5*VDD at VOUT pin by using the Output

reference voltage adjustment EEPROM (address: 03h, 08h, data: ELV[8], ELV[7:0]).

1.6) Input gain (G1/G2) setup

Set up G1/G2 gain so that Gain Amp.1/2 output voltages become the ranges (In the case of

VDD = 5V, G1  1600mV, G2  1850mV). The voltage and temperature coefficient which are

used for calculation is as follows.

The offset voltage and the span voltage at 25C take the MAX values of the pressure sensor to be used.

And the offset voltage temperature drift coefficient and the sensitivity temperature drift coefficient take

the MIN values (minus polarity) of the pressure sensor to be used.

Voff25: Offset voltage of the pressure sensor@25C

Vsp25: Span voltage of the pressure sensor @25C

Ktoff: Offset voltage temperature drift coefficient of the pressure sensor (MIN value)

Ktsp: Sensitivity temperature drift coefficient of the pressure sensor (MIN value)

■ In the case of VDD = 5V and temperature = -40 to 105C

Gain Amp.1 output

= G1*(Voff25+Vsp25+ktoff*(-40[C]-25[C])+Vsp25*ktsp*(-40[C]-25[C]))  1600mV

Gain Amp.2 output

= G1*G2*(Vsp25+Vsp25*ktsp*(-40[C]-25[C]))  1850mV

■ In the case of VDD = 3.3V/3.0V and temperature = -40 to 105C

Gain Amp.1 output

= G1*(Voff25+Vsp25+ktoff*(-40[C]-25[C])+Vsp25*ktsp*(-40[C]-25[C]))  750mV/750mV

Gain Amp.2 output

= G1*G2*(Vsp25+Vsp25*ktsp*(-40[C]-25[C]))  990mV/850mV

VOUT

CSCLK

1 4 169

Twr_REG

Hi-z

Level shift

monitor

CSCLK High Time

Analog

Output

1 2 ... 27 28 29 30 31 32 33 34 35 36 37 ... 67 68

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Vicom Systems FC-FC3 Bedienungsanleitung Seite 32