ICL7109
Typical Integrator Amplifier Output Waveform (INT Pin)
AUTO ZERO PHASE
(COUNTS)
6143 - 2048
INTEGRATE
PHASE FIXED
2048 COUNTS
DE-INTEGRATE PHASE
0 - 4095 COUNTS
TOTAL CONVERSION TIME = 8192 x t
CLOCK
(IN FREE-RUN MODE)
+5V
1 V+
XTAL 40
+5V
GND
1 GND
BUF OSC
25 OUT
2 STATUS
V+ 40
REF IN - 39
REF CAP- 38
REF CAP+ 37
REF IN+ 36
19 HBEN
GND
+5V
6
26 - 33 31
TBR 1 - 8
TRE 24
DRR 18
8
/
8
/
/
IN HI 35
IN LO 34
COMMON
3-8
B9 - B12, POL,OR INT
9 - 16
AZ
B1 - B8
BUF
17 TEST
18 LBEN
33
32
31
30
C
AZ
0.33µF
R
INT
-5V
20kΩ 0.2V REF
200kΩ 2V REF
1µF
+5V
1000pF
2 OSC CONTROL XTAL 17
GND
+5V
3 GND
4 RRD
EPE 39
CLS1 38
CLS2 37
5 - 12
RBR 1 - 8
13 PE
14 FE
15 OE
+5V
16 SFD
SBS 36
PI 35
CLR 34
-
GND
EXTERNAL
REFERENCE
+
+
1MΩ
0.01µF
-
C
INT
0.15µF
INPUT
GND
+5V
REF OUT 29
V- 28
SERIAL
INPUT
20 RRI
DR 19
21 MODE
RUN/HOLD 26
+5V OR OPEN
TBRL 23
TBRE 22
20 CE/LOAD
27 SEND
GND
OSC SEL 24
OSC OUT 23
OSC IN 22
GND
3.58MHz
CRYSTAL
SERIAL
OUTPUT
25 TRO
IM6403
CMOS UART
MR 21
ICL7109
CMOS A/D CONVERTER
FOR LOWEST POWER CONSUMPTION
TBR1 - TBR8 INPUTS SHOULD HAVE 100kΩ
PULLUP RESISTORS TO +5V
FIGURE 1A. TYPICAL CONNECTION DIAGRAM UART INTERFACE-TO TRANSMIT LATEST RESULT, SEND ANY WORD TO UART
7
INTERSIL [ INTERSIL CORPORATION ]
