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參數(shù)資料
| 型號(hào)： | HI-7159A |
| 廠商： | Intersil Corporation |
| 英文描述： | 128 MACROCELL 3.3 VOLT ISP CPLD - NOT RECOMMENDED for NEW DESIGN |
| 中文描述： | 微處理器兼容，5-1/2位A / D轉(zhuǎn)換 |
| 文件頁數(shù)： | 10/14頁 |
| 文件大小： | 210K |
| 代理商： | HI-7159A |
10
Due to the wide range of baud rates available in the serial
modes, some of the lower baud rates will take longer to transfer
the output data than it takes to perform a conversion. In these
cases the continuous mode should not be used. Table 11
shows the percentage of the total conversion time that it takes
to read all the data from the converter for the two serial modes.
These are best case numbers, assuming that the bytes are
transmitted and received end-to-end. An asterisk indicates that
it is impossible to get all the data out within one conversion.
Percentages in the 20-50% range indicate that it is possible to
get valid data out with very tight code. In all cases the status
byte should be checked before and after the reading to ensure
data integrity.
Crystal Oscillator
The HI-7159A uses a single pin crystal oscillator design
(Figure 7). The crystal is connected between Pin 27 and
V
CC
; no load capacitors or other components are
necessary. The user has a choice of crystal frequencies:
2.4576MHz or 2.4MHz. An off-the-shelf 2.4576MHz crystal
works well and provides baud rates of exactly 19.2K, 9600,
1200, and 300. However its total integration period will be
16.28ms, or 0.39ms shorter than a 60Hz cycle. This
effectively reduces the normal mode AC rejection.
A 2.4MHz crystal results in an integration period of 16.67ms,
exactly the length of one 60Hz AC cycle. Normal mode AC
rejection is greatest at this frequency. At 2.4MHz, however,
the Baud rates will be off by -2.34%. This error is not large
enough to cause any errors with most peripherals, and only
applies to operation in Serial Modes 1 and 2.
Communication in Serial Mode 0 and the Parallel Mode is
independent of the crystal frequency. For this mode a
2.4MHz crystal is recommended.
While the oscillator was designed to operate at
2MHz - 2.5MHz, the HI-7159A itself will operate reliably
down to less than 600kHz when driven with an external
clock. Benefits at lower clock frequencies include reduced
rollover error (gain error for negative input voltages) and
lower noise. The baud rates mentioned throughout this data
sheet correspond to a crystal frequency of 2.4576MHz. At
1.2MHz, the actual baud rates will be half the speed they
were at 2.4MHz, i.e., 9600, 4800, 600 and 150 baud. At
600kHz they will be one-fourth.
SEND COMMAND BYTE
(INITIATE SINGLE CONVERSION)
CONVERSION RESULT
IS VALID
D6 = 1
GET STATUS BYTE
GET DIGIT BYTES
NO
YES
FIGURE 5. READING THE HI-7159A IN THE SINGLE
CONVERSION MODE
GET STATUS BYTE
GET DIGIT BYTES
D6 = 0
CONVERSION
RESULT IS
VALID
GET STATUS BYTE
YES
NO
CONVERSION
RESULT MAY
BE INVALID:
DISCARD
RESULT
NO
YES
D6 = 1
FIGURE 6. READING THE HI-7159A IN THE CONTINUOUS
CONVERSION MODE
TABLE 11. SERIAL MODES
1
/
2
BAUD
RATE
CONVERSION TYPE
5
1
/
2
COMP
*
/
*
54%/
*
5
1
/
2
UNCOMP
*
/
*
*
/
*
4
1
/
2
COMP
*
/
*
*
/
*
4
1
/
2
UNCOMP
*
/
*
*
/
*
54%/
*
300
1200
9600
7%/13%
14%/25%
27%/50%
19200
4%/7%
7%/13%
14%/25%
27%/50%
+5V
1
27
V
CC
X
TAL
CRYSTAL
(2MHz TO 2.5MHz)
HI-7159A
FIGURE 7. SINGLE-PIN OSCILLATOR
HI-7159A
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