11/01/05

3

ES51986

6000 Count AUTO DMM

Pin Description

Pin No Symbol

Type

Description

1

NC

2

V+

P

Positive supply voltage, output of on-chip DC-DC converter.

3

V+

P

Positive supply voltage, output of on-chip DC-DC converter.

4

NC

5

CL+

IO

High resolution positive connection for reference capacitor.

6

CL-

IO

High resolution negative connection for reference capacitor.

7

CIL

O

High resolution integrator output. Connected to integral capacitor

8

CAZL

O

High resolution auto-zero capacitor connection.

9

BUFL

O

Integral resistor connection for high resolution buffer output

10

IVSH

I

High current measurement input.

11

IVSL

I

Low current measurement input

12

OVX

I

Input high voltage for resistance measurement

13

OVH

I

Output connection for resistance measurement

14

OVSG

I

Sense low voltage for resistance measurement

15

NC

16

OR1

O

Reference resistor connection for 600.0Ω range

17

VR5

O

Voltage measurement ÷10000 attenuator(6000V)

18

VR4

O

Voltage measurement ÷1000 attenuator(600.0V)

19

VR3

O

Voltage measurement ÷100 attenuator(60.00V)

20

VR2

O

Voltage measurement ÷10 attenuator(6.000V)

21

TEST 5

I/O

Test pin

22

ACVL

O

Negative output of AC to DC converter

23

ACVH

O

Positive output of AC to DC converter.

24

NC

25

ADI

I

Negative input of internal AC to DC Opamp.

26

NC

27

ADO

O

Output of internal AC to DC Opamp.

28

NC

29

VRH

O

Output of band-gap voltage reference .Typically –1.2V

30

VR

I

Reference input voltage connection. Typically –100mV

31

VA+

I

For ADP. Deintegrating voltage positive input. The input should

be higher than VA-.

32

VA-

For ADP. Deintegrating voltage negative input. The input should

be lower than VA+.

33

ADP

I

ADP input

34

SGND

G

Signal Ground

35

VR1

I

Measurement input

36

NC

37

VBAR

I

In capacitance mode, a compensation capacitance is connected

In temperature mode, it is used to control decimal point. See page 11

38

R9K

O

Connect to a 9KΩ resister for capacitor measurement.

39

R1K

O

Connect to a 1KΩ resister for capacitor measurement.

40

CA-

IO

Negative auto-zero capacitor connection for capacitor measurement

41

CA+

IO

Positive auto-zero capacitor connection for capacitor measurement

42

SLEEP

O

Asserts low in the sleep mode. See page 9, function description

43

FREQ

I

Frequency counter input, offset V-/2 internally by the chip.

44

NC

45

RS232

I

Pulse low to enable serial data output.

46

BKLIT

I

Back light function. Pulse low to set BKOUT pin output

O

LCD segment line 17~13