hi7131 Intersil Corporation, hi7131 Datasheet - Page 12

• Manufacturer Part Number: hi7131
• Description: 3 1/2 Digit, Low Power, High Cmrr, Lcd/led Display-type A/d Converters
• Manufacturer: Intersil Corporation

†
†
ONE INVERTER SHOWN FOR CLARITY
ONE INVERTER SHOWN FOR CLARITY
THREE INVERTERS
THREE INVERTERS
TYPICAL SEGMENT OUTPUT
TYPICAL SEGMENT OUTPUT
INTERNAL DIGITAL GROUND
GND
0.5mA
8mA
0.5mA
2.0mA
HI7133
HI7131
V
SEGMENT
V+
SEGMENT
+
OUTPUT
TO
OSC 1
OSC 1
FROM COMPARATOR OUTPUT
FROM COMPARATOR OUTPUT
POLARITY
40
40
POLARITY
†
†
TO SWITCH DRIVERS
TO SWITCH DRIVERS
OSC 2
OSC 2
FIGURE 94. DIGITAL SECTION
CLOCK
CLOCK
HI7131, HI7133
COUNTER
1000’s
39
39
COUNTER
1000’s
3-1837
b
a
OSC 3
OSC 3
b
a
COUNTER
SEGMENT
DECODE
COUNTER
SEGMENT
e
DECODE
100’s
38
f
e
38
LCD PHASE DRIVER
100’s
7
f
d
g
INTERNAL
7
a
d
GROUND
DIGITAL
g
a
+4
+4
c
b
c
LATCH
b
c
LATCH
c
SEGMENT
COUNTER
e
DECODE
SEGMENT
COUNTER
f
DECODE
e
10’s
f
d
10’s
g
7
a
d
7
LOGIC CONTROL
g
LOGIC CONTROL
a
c
b
c
b
e
SEGMENT
COUNTER
f
DECODE
d
V
g
1’s
SEGMENT
COUNTER
a
TH
e
7
DECODE
f
UNITS
c
b
= 1V
d
g
7
a
c
b
21
200
500
500
BACKPLANE
6.2V
37
26
37
21
V+
TEST
V-
TEST
GND