TC820CLW Просмотр технического описания (PDF) - TelCom Semiconductor Inc => Microchip

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TC820CLW

3-3/4 DIGIT A/D CONVERTER WITH FREQUENCY COUNTER AND LOGIC PROBE

TelCom Semiconductor Inc => Microchip 

3-3/4 A/D CONVERTER WITH

FREQUENCY COUNTER

AND LOGIC PROBE

1

TC820

PIN DESCRIPTION

Pin No.

(40-Pin

Package)

20

Pin No.

(44-Pin Flat

Package)

16

Symbol

DP0/LO

21

17

DP1/HI

22

18

BUZOUT

23

19

BUZIN

24

20

FREQ/

VOLTS

25

21

PKHOLD

22

UR

23

OR

26

24

VSS

27

25

COM

28

26

CR+ EF

29

27

CR– EF

30

28

VR+ EF

31

29

VR– EF

32

30

VI–N

33

31

VI+N

34

32

VBUFF

35

33

CAZ

36

34

VINT

35

EOC/

HOLD

37

36

OSC1

38

37

OSC2

39

38

OSC3

40

39

VDD

Description

Dual-purpose input. Decimal point select input for voltage measurements. In logic

mode, connecting this pin to VDD will turn on the "low" LCD segment. There is an

internal 5µA pull-down to DGND in volts mode only. Decimal point logic:

DP1 DP0 Decimal Point Selected

0

0

None

0

1

DP1

1

0

DP2

1

1

DP3

Dual-purpose input. Decimal point select input for voltage measurements. In logic

mode, connecting this pin to VDD will turn on the "high" LCD segment. There is an

internal 5µA pull-down to DGND in volts mode only.

Buzzer output. Audio frequency, 5kHz, output which drives a piezoelectric buzzer.

Buzzer control input. Connecting BUZIN to VDD turns the buzzer on. BUZIN is

logically ORed (internally) with the "logic level low" input. There is an internal 5µA

pull-down to DGND.

Voltage or frequency measurement select input. When unconnected, or connected

to DGND, the A/D converter function is active. When connected to VDD, the

frequency counter function is active. This pin has an internal 5µA pull-down

to DGND.

Peak hold input. When connected to VDD, the converter will only update the display

if a new conversion value is greater than the preceding value. Thus, the peak

reading will be stored and held indefinitely. When unconnected, or connected to

DGND, the converter will operate normally. This pin has an internal 5µA pull-down

to DGND.

Underrange output. This output will be HIGH when the digital reading is 380 counts

or less.

Overrange output. This output will be HIGH when the analog signal input is greater

than full scale. The LCD will display "OL" when the input is overranged.

Negative supply connection. Connect to negative terminal of 9V battery.

Analog circuit ground reference point. Nominally 3.3V below VDD.

Positive connection for reference capacitor.

Negative connection for reference capacitor.

High differential reference input connection.

Low differential reference input connection.

Low analog input signal connection.

High analog input signal connection.

Buffer output. Connect to integration resistor.

Auto-zero capacitor connection.

Integrator output. Connect to integration capacitor.

Bidirectional pin. Pulses low (i.e., from VDD to DGND) at the end of each

conversion. If connected to VDD, conversions will continue, but the display is not

updated.

Crystal oscillator (input) connection.

Crystal oscillator (output) connection.

RC oscillator connection.

Positive power supply connection, typically 9V.

2

3

4

5

6

7

8

TELCOM SEMICONDUCTOR, INC.

3-153

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