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參數(shù)資料
| 型號(hào)： | HI3-7159A-5Z |
| 廠商： | Intersil |
| 文件頁(yè)數(shù)： | 13/14頁(yè) |
| 文件大?。?/td> | 0K |
| 描述： | IC ADC 5-1/2 DIGIT 28-PDIP |
| 標(biāo)準(zhǔn)包裝： | 13 |
| 位數(shù)： | 5.5 位 |
| 采樣率（每秒）： | 200k |
| 數(shù)據(jù)接口： | 串行，并聯(lián) |
| 轉(zhuǎn)換器數(shù)目： | 1 |
| 電壓電源： | 單電源 |
| 工作溫度： | 0°C ~ 70°C |
| 安裝類型： | 通孔 |
| 封裝/外殼： | 28-DIP（0.600"，15.24mm） |
| 供應(yīng)商設(shè)備封裝： | 28-PDIP |
| 包裝： | 管件 |
| 輸入數(shù)目和類型： | 1 個(gè)差分，雙極 |
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8
Serial Mode 2
Serial Mode 2 is selected by tying SEL (pin 28) low, SMS0
(pin 18) high, and SMS1 (pin 19) low, as shown in Figure 4C.
This mode of operation is identical to Serial Mode 1, except
that each device now has one of 32 unique addresses
determined by the state of pins 20-23 and 17, as shown in
Table 3. This allows multiple HI-7159As to be attached to the
same pair of serial lines.
When the microprocessor sends out an Address Byte (Table
4) that matches one of the HI-7159As’ hardwired addresses,
that particular HI-7159A is selected for all further I/O until
another Address Byte with a different address is
transmitted.
Reading the HI-7159A
Despite the wide variety of interface options available on the
HI-7159A, the procedure for communicating with it is
essentially the same in all four modes. (Serial Mode 2 differs
from the rest in two respects: the chip to be communicated
with must rst be sent an address byte to select it, and the
digit bytes are sent one by one, for a total of six bytes,
instead of in pairs.) There are two types of bytes that can be
sent to the converter, commands and requests. A command
byte (Table 5) sets the parameters of and initiates a
conversion. Those parameters are: continuity of the
conversion (single or continuous), resolution (51/2 or 4
1/
2
digits), and type of conversion (Compensated,
Uncompensated, or Error Only). Bit D0 = 0 indicates that this
is a command byte and a new conversion(s) should be
started.
A request byte (Table 6) asks for either the status of the
converter or the result of a conversion. All bits of a request
should be set to 0 except D3, D2, and D0. D3 and D2
determine the type of request (status or digit pair), and D0 =
1 indicates to the HI-7159A that this is a request byte. Serial
Mode 2 uses a slightly modied request byte, shown in Table
7, allowing it to individually select each of the six digit bytes.
Upon receipt of a request, the HI-7159A will respond with
either a status or a digit byte. The status byte (Table 8)
returns the current state of the converter. Bit D6 = 1
indicates that a new conversion has been completed since
the last time the status byte was read. Bit D6 is cleared after
it is read. Bit D4 shows the current continuity (single or
continuous). Bit D3 indicates the resolution (51/2 or 4
1/
2
digits) of the conversion, and bits D2 and D1 indicate the
type (Compensated, Uncompensated, or Error Only). Bit
D0 = 0 indicates that there was no parity error detected in
the last request byte.
The three digit bytes (Table 9) each contain two nibbles
representing two digits of the conversion. The sixth nibble
contains the MSD (most signicant digit), polarity
(1 = positive) and overrange (1 = overrange) information. In
Serial Mode 2 the digits (Table 10) are requested and
received individually, so a total of six requests and six reads
is necessary to obtain all 51/2 digits.
TABLE 3. HARDWARE ADDRESS SELECTION FOR MODE 2
PIN 17
PIN 23
PIN 22
PIN 21
PIN 20
B4 (MSB)
B3
B2
B1
B0 (LSB)
TABLE 4. SERIAL MODE 2 ADDRESS BYTE FORMAT (SENT TO HI-7159A)
ADDRESS BIT
(RESERVED)
(MSB)
(LSB)
D7
D6
D5
D4
D3
D2
D1
D0
1
0
B4B3B2B1B0
TABLE 5. COMMAND BYTE FORMAT (SENT TO HI-7159A)
(RESERVED)
CONTINUITY
RESOLUTION
CONVERSION TYPE
COMMAND BIT
D7
D6
D5
D4
D3
D2
D1
D0
0
Single
0
51/2
1
Comp
1
0
Continuous
1
41/2
0
Uncomp
1
0
Error Only
0
1
TABLE 6. REQUEST BYTE FORMAT, PARALLEL AND SERIAL MODE 1 (SENT TO HI-7159A)
(RESERVED)
BYTE REQUEST
(RESERVED)
REQUEST BIT
D7
D6
D5
D4
D3
D2
D1
D0
0
Digit Pair 0, 1
0
1
Digit Pair 2, 3
0
1
Digit Pair 4, 5
1
0
Converter Status
1
HI-7159A
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