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參數(shù)資料
| 型號： | LTC1094CN#PBF |
| 廠商： | Linear Technology |
| 文件頁數(shù)： | 8/32頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC DATA ACQ SYS 10BIT 8CH 20-DIP |
| 標(biāo)準(zhǔn)包裝： | 18 |
| 類型： | 數(shù)據(jù)采集系統(tǒng)（DAS），ADC |
| 分辨率（位）： | 10 b |
| 數(shù)據(jù)接口： | 串行 |
| 電壓電源： | 雙 ± |
| 電源電壓： | ±5V，4.5V，10V |
| 工作溫度： | -40°C ~ 85°C |
| 安裝類型： | 通孔 |
| 封裝/外殼： | 20-DIP（0.300"，7.62mm） |
| 供應(yīng)商設(shè)備封裝： | 20-PDIP |
| 包裝： | 管件 |
| 產(chǎn)品目錄頁面： | 1345 (CN2011-ZH PDF) |
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16
LTC1091/LTC1092
LTC1093/LTC1094
U
S
A
O
PPLICATI
WU
U
I FOR ATIO
3. Accommodating Microprocessors with
Different Word Lengths
The LTC1091/LTC1093/LTC1094 will fill zeros indefinitely
after the transmitted data until CS is brought high. At that
time the DOUT line is disabled. This makes interfacing easy
to MPU serial ports with different transfer increments
including 4 bits (e.g., COP400) and 8 bits (e.g., SPI and
MICROWIRE/PLUS
TM). Any word length can be accommo-
dated by the correct positioning of the start bit in the
LTC1091 input word.
Figure 1 shows examples of LTC1091 input and output
words for 4-bit and 8-bit processors. A complete data
exchange can be implemented with two 4-bit MPU outputs
and three inputs in 4-bit systems and one 8-bit output and
two inputs in 8-bit systems. The resulting data winds up
left justified in the MPU with zeros automatically filled in
the unused low order bits by the LTC1091. In section 5
another example is given using the MC68HC05C4 which
MICROWIRE/PLUS is a trademark of National Semiconductor Corp.
eliminates one 8-bit transfer and positions data right
justified inside the MPU.
4. Operation with DIN and DOUT Tied Together
The LTC1091/LTC1093/LTC1094 can be operated with
DIN and DOUT tied together. This eliminates one of the lines
required to communicate to the MPU. Data is transmitted
in both directions on a single wire. The processor pin
connected to this data line should be configurable as either
an input or an output. The LTC1091, for example, will take
control of the data line and drive it low on the 4th falling
CLK edge after the start bit is received (see Figure 2).
Therefore, the processor port line must be switched to an
input before this happens, to avoid a conflict.
In the next section, an example is made of interfacing
the LTC1091 with DIN and DOUT tied together to the Intel
8051 MPU.
FILL ZEROS
X = DON’T CARE
1091/2/3/4 F01
CLK
CS
DOUT
MPU SENDS
2 DIN WORDS
4-BIT
TRANSFERS
MPU READS BACK
3 DOUT WORDS
START
BIT
DIN
Hi-Z
START
MSBF
X
0
1
B9
B8
B7
B6
B5
B4
B3
B2
B1
B0
SGL/
DIFF
ODD/
SIGN
SGL/
DIFF
ODD/
SIGN
MSBF
X
SGL/
DIFF
ODD/
SIGN
B9
B8
B7
B6
B5
B4
B3
B2
B1
B0
0
B9
B8
B7
B6
B5
B4
B3
B2
B1
B0
0
START
BIT
0
1
MPU SENDS
1 DIN WORD
8-BIT
TRANSFERS
MPU READS BACK
2 DOUT WORDS
Figure 1. LTC1091 Input and Output Word Arrangements for 4-Bit and 8-Bit Serial Port Microprocessors
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