7

Typical Integrator Amplifier Output Waveform (INT Pin)

AUTO ZERO PHASE

(COUNTS)

6143 - 2048

INTEGRATE

PHASE FIXED

2048 COUNTS

DE-INTEGRATE PHASE

0 - 4095 COUNTS

FIGURE 1A. TYPICAL CONNECTION DIAGRAM UART INTERFACE-TO TRANSMIT LATEST RESULT, SEND ANY WORD TO UART

18

1

25

2

19

17

21

20

27

GND

BUF OSC

STATUS

HBEN

3 - 8

B9 - B12, POL,OR

9 - 16

TEST

LBEN

MODE

CE/LOAD

SEND

28

40

39

38

37

36

35

34

33

32

31

30

29

26

24

23

22

V+

REF IN -

REF CAP-

REF CAP+

REF IN+

IN HI

IN LO

COMMON

INT

AZ

BUF

REF OUT

V-

RUN/HOLD

OSC SEL

OSC OUT

OSC IN

GND

GND

+5V

1

µF

0.01

µF

0.33

µF

0.15

µF

1M

Ω

3.58MHz

CRYSTAL

-

+

+

INPUT

GND

EXTERNAL

REFERENCE

-5V

GND

-

20k

Ω 0.2V REF

200k

Ω 2V REF

+5V OR OPEN

OUT

/

/

6

8

B1 - B8

1

2

3

4

13

14

15

16

20

25

V+

OSC CONTROL

GND

RRD

5 - 12

PE

FE

OE

SFD

RRI

TRO

18

40

17

39

38

37

36

35

34

31

24

19

23

22

21

XTAL

XTAL

EPE

CLS1

CLS2

SBS

PI

CLR

26 - 33

TRE

DRR

DR

TBRL

TBRE

MR

GND

GND

TBR 1 - 8

+5V

+5V

8

/

GND

1000pF

RBR 1 - 8

SERIAL

OUTPUT

SERIAL

INPUT

+5V

+5V

+5V

IM6403

CMOS UART

ICL7109

CMOS A/D CONVERTER

FOR LOWEST POWER CONSUMPTION

TBR1 - TBR8 INPUTS SHOULD HAVE 100k

Ω

PULLUP RESISTORS TO +5V

+5V

ICL7109