Ver 1.5

17/03/29

20

ES166

LCR/DMM analog front

2.9 LC impedance mode

F3

F2

F1

F0

Measurement mode

Read data bytes

0

1

1

0

LC impedance mode A(31-00), B(31-00), C(31-00)

Note: A/B/C/D is 32-bit signed integer. (2’s complement binary number)

Measured in series mode Zs = Rs + jXs

)

0

(

2

)

0

(

2

1

}

Im{

1

}

Re{

32

32

32

32

>

⋅⋅

⋅⋅

⋅⋅

⋅⋅

⋅⋅

⋅⋅

⋅⋅

⋅⋅

⋅

×

×

=

<

⋅⋅

⋅⋅

⋅⋅

⋅⋅

⋅⋅

⋅

×

×

×

−

=

=

×

=

=

×

×

−

=

Xs

f

Xs

Ls

Xs

Xs

f

Cs

Xs

C

R

B

Zs

Rs

C

R

A

Zs

Range

Range

π

π

In parallel mode:

command.

Control bits

Terminal

Equivalent Range Resistor

RR1

RR0

PG1

PG0

1

0

0

0

SW3

100k

Ω

0

1

0

0

SW2

10k

Ω

0

0

0

0

SW1

1k

Ω

0

0

0

1

SW1

100

Ω

0

0

1

0

SW1

10

Ω

f

is the test frequency for LC impedance measurement which could be selected by

MCU write command.

Control bits

Frequency ( f )

FG1

FG0

0

0

100 Hz

0

1

120 Hz

1

0

1 kHz

1

1

10 kHz

o

o

Rs

Xs

Q

D

Xp

Rp

Rs

Xs

Q

90

90

)

(

tan

1

|

|

|

|

1

+

≤

≤

−

⋅⋅

⋅⋅

⋅⋅

⋅⋅

=

=

=

=

−

θ

θ