FS9701B datasheet(30/46 Pages) FORTUNE

30 / 46 page

FS970X

Rev. 4.4

30/46

AGND

OSR

2.4 V

2 k



VRH

VRL

INH

INL

 ~ 500 

REF

1 k



AGND

OSR

1.2 V

2 k



VRH

VRL

INH

INL

 ~ 5 M

REF

10 M



AGND

OSR

1.2 V

2 k



VRH

VRL

INH

INL

 ~ 5 k

REF

10 k



AGND

OSR

1.2V

2 k



VRH

VRL

INH

INL

 ~ 50 k

REF

100 k



AGND

OSR

1.2 V

2 k



VRH

VRL

INH

INL

 ~ 500 k

REF

1 M



(a)

(b)

(c)

(d)

(e)

AGND

OSR

1.2 V

2 k



VRH

VRL

INH

INL

 ~ 50 M

REF

10 M



(f)

VRH - VRL =

0.8 V ~ 0.686 V

INH - INL =

0 V ~ 0.343 V

VRH - VRL =

1.0 V ~ 0.706 V

INH - INL =

0 V ~ 0.353 V

INH - INL =

0 V ~ 0.395 V

VRH - VRL =

1.176 V ~ 0.789 V

VRH - VRL =

1.198 V ~ 0.799 V

INH - INL =

0 V ~ 0.399 V

VRH - VRL =

1.20 V ~ 0.80 V

INH - INL =

0 V ~ 0.40 V

VRH - VRL =

1.20 V ~ 0.20 V

INH - INL =

0 V ~ 1.00 V

Graph 14. The converting voltage range of scale-type resistor measurement.

The 1

st condition is low resistance under 5 k

.

The

can be obtained by setting the reference voltage

equivalent to 0.8 V. The 0.8 V can be generated by the fixed voltage generator in the chip. (as shown in Chart

7), through ACBUF output, connecting to AX3 and then into VRH. Or obtained through ACBUF, connecting

to AX5, through Ωpower supply, and returning to VRH.

The 2

nd condition is middle resistance between 50 k

 ~ 5 M.

The

can be obtained by setting the

reference voltage equivalent to 1.0 V. Under this condition, the

value, just like the other measuring

value, can be processed by the same parameter.

The 3

rd condition is high resistance – 50 M

.

Because the various range of the reference voltage is too

great, the value of

can be easily use an approximate number. Therefore it can be obtained by reducing

the Bargrapg display speed and using the reading of the high resolution output, or reduce the digit of the

Bargraph to 10 or 20 digit.

By using the method illustrated in this section to set the reference voltage between 0.8 V and 1.0V when cut in

the resistor file and calibrate the

of under 5 k and 50 k ~ 5 M respectively. According to different

measurement range to select different

. Then using the calculation shown in 8.5.2, we can complete the

calculation of 50 digit of fast Bargraph display.

The Conversion of Digital Output & Equivalent Voltage

Take the high resolution digital output of FS970X, the output, SUM1<23:0>, is the compensation value of

2/24bits. Whereas, SUM1<23> is the symbol bit – “0” = positive, and “1” = negative. The floating point locates

between SUM1<22> and SUM1<21>.

Assuming SUM1<23:0>=0010_1000_0000_0000_0000_0000, the equivalent floating point calculation is:

Formula 10

625

125

......

0000

1000

SUM

































Assuming SUM1<23:0>=1101_1111_1111_1111_1111_1111, the equivalent floating point calculation is:

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