ICM7217_01 Datasheet, PDF (19/20 Pages) Intersil Corporation – 4-Digit LED Display, Programmable Up/Down Counter

22pF 22pF
14
2
13
10kΩ
BCD
OUT
25 - 28
4
5
24
6
7
10kΩ
CRYSTAL
f = 5.24288MHz
R_S = 75Ω
ICM7207A
4
10
5
6
1_/4
CD4011
ICM7217
COUNT
8
STORE
9
RESET
14
15 - 19
21, 22
20
INPUT
FIGURE 23. PRECISION FREQUENCY COUNTER (MHz MAXIMUM)
COMMON ANODE
V+ = 5V _{LED DISPLAY}
4 DIGITS
7 SEGMENTS
400mV
FULL SCALE
INPUT
+
-
0.1µF
+5V
S
DQ
Q
R
1 GND
2 STATUS
V_DD 40
REF IN - 39
3 POL
REF CAP - 38
4 OR
REF CAP + 37
5 B12
REF IN + 36
6 B11
IN HI 35
7 B10
IN LO 34
8 B9
COMMON 33
9 B8
INT 32
10 B7 _ICM7109 AZ 31
11 B6
BUF 30
12 B5
REF OUT 29
13 B4
14 B3
V_SS 28
SEND 27
15 B2
RUN/HOLD 26
16 B1
BUF OSC OUT 25
17 TEST
OSC SEL 24
18 LBEN
OSC OUT 23
19 HBEN
OSC IN 22
20 CE/LOAD
MODE 21
+5V
1µF
100K
10K
0.1µF
0.22µF
47K
+5V
100pF
100K
100K
+5V
+5V
4 DIGIT COMMON ANODE
LED DISPLAY
S
D Q ₂₇₀
Q
7
R
LED
MINUS SIGN
+5V
10µF
TARE
5 x 1N4148
1 ^CARRY/
BORROW
2 _ZERO
3 EQUAL
D0 28
D1 27
D2 26
4 BCD 8
D3 25
5 BCD 4
6 BCD 2
7 BCD 1
V_DD 24
DISP. ₂₃
CONT.
G 22
8 COUNT
B 21
9 STORE
10 UP/DOWN
V_SS 20
E 19
11 LOAD REG.
F 18
12 LOAD CTR.
D 17
13 SCAN
A 16
14 RESET
C 15
ICM7217
7
+5V
47µF
FIGURE 24. AUTO-TARE SYSTEM FOR A/D CONVERTER
19