TC820CLW データシートの表示（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

FUNCTIONAL BLOCK DIAGRAM

CR+ EF

VI+N

VI–N

VR+ EF

VR– EF

COMMON

VDD

VSS

CR–EF VBUFF CAZ VINT OSC1 OSC2

OSC3

BUZ IN

LOGIC

LOW

÷8

÷2

FREQUENCY COUNTER INPUT

LOW TO LCD

BATT

DETECT

A/D CONTROL

DEINT

UNDERRANGE

OVERRANGE

EOC

RANGE

RANGE/FREQ

INPUT

TC820

A/D COUNTER SELECT

SEL

B

A

RANGE

A/D COUNTER

(3999 COUNTS)

COMPARATOR

A>B

LOW BATT

DISPLAY

LATCH

LOGIC

LOW

TRIPLEX

DRIVERS

15

DGND UR OR EOC/

HOLD

PEAK

HOLD

ANNUNC VDISP SEG0 • • • BP3

1

TC820

2

BUZZER

DRIVER

RANGE/

FREQ

3

FREQ/

VOLTS

4

LOGIC

DP0/LO

DP1/HI

5

6

7

TELCOM SEMICONDUCTOR, INC.

8

3-155

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