FS970X datasheet(17/46 Pages) FORTUNE

17 / 46 page

FS970X

Rev. 4.4

17/46

Function Decoder

Function decoder includes two set of input – MODE and RANGE. RANGE controls area network switch to

determine measurement range, and MODE controls the function network signal to determine measurement

mode.

As shown in Chart 5, the setup of register MODE3:0 (represents MODE<3:0>) can decode the control signals

such as cap. Sdt. Vsr. Cntd and endvo. It also controls the measurement mode and operation status of

function network.

When High Bandwidth AC is capable of processing AC signal more than 1 MHz, SDV can be the direct output

of SDV. Refer to section 7.5.1 for details.

Measurement Mode

MODE3:0 cap sdt vsr cntd endvo

DCmV, DCV, ACV, and PKH

0000

DIODE

0001

High Bandwidth AC

0011

Resistor x, Continuity

100x

Capacitor x

101x

Chart 5

Control of Measurement mode .

As shown in Chart 6, area network switch is controlled by both MODE3:0 and RANGE3:0. The four bits in

RANGE directly controls network resistor path: 1k

path of 10M

d by

Formula 2

e a b c d f

    

Under Range Divider mode, area network becomes decay network. It controls area network on/off status to

determine different measurement range according to the setup of RANGE3:0. Under Resistor mode, area

network will become the reference resistor initiated by appropriate returned Ω supply. It selects different

reference resistor to determine different measurement range according to the setup of RANGE3:0. Resistor I or

II represent respectively whether reference resistor is parallel with the 10 M resistor. Under Capacitor mode,

area network becomes charge/discharge resistor with power supply. Capacitor I or II also represent whether

charge/discharge resistor is parallel with 10 M resistor.

Range Mode

MODE3:0 RANGE3:0 onek2:0 tenk2:0 hunk2:0 onem2:0 tenm1:0

Range Divider

00xx

abcd

0aa

0bb

0cc

0dd

Resistor I

1000

abcd

aaa

Bbb

ccc

ddd

Resistor II

1001

abcd

aaa

Bbb

ccc

ddd

Capacitor I

1010

abcd

aaa

Bbb

ccc

ddd

Capacitor II

1011

abcd

aaa

Bbb

ccc

ddd

Chart 6

Decay network switch.

FS970X Datasheet(PDF) 17 Page - Fortune Semiconductor Corp.

FS970X Datasheet(HTML) 17 Page - Fortune Semiconductor Corp.

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