參數(shù)資料
型號(hào)： ICL8052A
廠商： Intersil Corporation
英文描述： Precision 4 1/2 Digit, A/D Converter
中文描述： 精密4 1 / 2位，A / D轉(zhuǎn)換
文件頁(yè)數(shù)： 17/23頁(yè)
文件大小： 582K
代理商： ICL8052A
17
Interfacing with UARTs and
Microprocessors
Figure 15 shows a very simple interface between a free-
running 8068A/8052A/71C03A and a UART. The five
STROBE pulses start the transmission of the five data words.
The digit 5 word is 0000XXXX, digit 4 is 1000XXXX, digit 3 is
0100XXXX, etc. Also, the polarity is transmitted indirectly by
using it to drive the Even Parity Enable Pin (EPE). If EPE of
the receiver is held low, a parity flag at the receiver can be
decoded as a positive signal, no flag as negative. A complex
arrangement is shown in Figure 14. Here the UART can
instruct the A/D to begin a measurement sequence by a word
on RRI. The Busy signal resets the Data Ready Reset (DRR).
Again STROBE starts the transmit sequence. A quad 2 input
multiplexer is used to superimpose polarity, over-range, and
under-range onto the D
5
word since in this instance it is
known that B
2
= B
4
= B
8
= 0.
For correct operation it is important that the UART clock be
fast enough that each word is transmitted before the next
STROBE pulse arrives. Parity is locked into the UART at
load time but does not change in this connection during an
output stream.
Circuits to interface the 71C03(A) directly with three popular
microprocessors are shown in Figures 17, 18 and 19. The
main differences in the circuits are that the IM6100 with its
12-bit word capability can accept polarity, over-range, under-
range, 4 bits of BCD and 5 digits simultaneously where the
8080/8048 and the MC6800 groups with 8-bit words need to
have polarity, over-range and under-range multiplexed onto
the Digit 5 word - as in the UART circuits. In each case the
microprocessor can instruct the A/D when to begin a
measurement and when to hold this measurement.
FIGURE 12. CMOS OSCILLATOR
FIGURE 13. LM311 OSCILLATOR
FIGURE 14. GROSS OVERVOLTAGE PROTECTION CIRCUIT
R
37.5k
f
OSC
= 0.45/RC
C
100pF
LM311
-
+
1
4
3
2
7
8
56k
1k
30k
16k
16k
390pF
+5V
0.22
μ
F
A2
+
-
A3
+
-
INTEG.
COMP.
A1
+
-
BUFFER
14
11
9
INT OUT
-INT IN
BUF OUT
10
-BUF IN
-1.2V
2
1
-15V
7
8
+15V
12
+INT IN
13
8052A/
8068A
INT.
REF.
6
3
+BUF IN
5
REF
OUT
300pF
COMP
OUT
100K
0.22
μ
F
2N5458
2N5461
S
D
S
D
REF
COMP
TO ICL71C03
Application Notes
NOTE #
DESCRIPTION
AN016
“Selecting A/D Converters”
AN017
“The Integrating A/D Converter”
AN018
“Do’s and Don’ts of Applying A/D Converters”
AN023
“Low Cost Digital Panel Meter Designs”
AN028
“Build an Auto-Ranging DMM Using the 8052A/7103A
A/D Converter Pair,” by Larry Goff
ICL8052A/ICL71C03, ICL8068A/ICL71C03
相關(guān)PDF資料
PDF描述
ICL8068A Precision 4 1/2 Digit, A/D Converter
ICL8068 Precision 4 1/2 Digit, A/D Converter
ICL8068ACDD 14-Bit/16-Bit, Microprocessor- Compatible, 2-Chip, A/D Converter
ICL8068CDD 14-Bit/16-Bit, Microprocessor- Compatible, 2-Chip, A/D Converter
ICL71C03 Precision 4 1/2 Digit, A/D Converter(精密4 1/2 位A/D轉(zhuǎn)換器)
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