ES5120
3 3/4 DIGIT A/D CONVERTER
Pin No. Pin No.
(40-pin (44-pin Flat
Package) Package) Symbol Descrlption
Buzzer control input. Connecting BUZIN to V＋ turns the buzzer
23
19
BUZIN
on. BUZIN is logically ORed(internally) with the "logic level low"
input. There is an internal 5μA pulldown to DGND.
24
20
FREQ/
Voltage or frequency measurement select input. When connected to
DGND, the a-d converter function is active. When connected to V
＋ the frequency counter function is active. This pin has an internal
5μA pulldown to DGND.
VOLTS
Peak Hold input. When connected to V＋, the converter will only
25
21 PKHOLD
update the display if a new conversion value is greater than the
preceeding 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
pulldown to DGND.
(Note : This pin may be with the function of EOC/HOLD which
depends on chip bonding.)
22
23
UR
OR
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.
CYRUSTEK [ Cyrustek corporation ]
