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參數資料
| 型號： | MAX110 |
| 廠商： | Maxim Integrated Products, Inc. |
| 英文描述： | Low-Cost, 2-Channel, 4-Bit Serial ADCs(±5V，2通道，±14位串行模數轉換器) |
| 中文描述： | 低成本、2通道、±14位串行ADC |
| 文件頁數： | 13/24頁 |
| 文件大?。?/td> | 286K |
| 代理商： | MAX110 |
M
Low-Cost, 2-Channel, ±14-Bit S erial ADCs
______________________________________________________________________________________
13
CS
SCLK
t
CSH
t
CSS
t
CK
t
DH
MSB
LSB
t
DS
DIN
DOUT
BUSY
t
DH
t
CK
t
DO
t
DA
POL
OFL
MSB
DO
END OF
CONVERSION
START OF
CONVERSION
Figure 6. Detailed Serial-Interface Timing
The ADC serial interface operates with just SCLK, DIN,
and DOUT (allow sufficient time for the conversion to
complete between read/write operations). Achieve con-
tinuous operation by connecting
BUSY
to an uncommit-
ted μP I/O or interrupt, to signal the processor when the
conversion results are ready. Figures 8a and 8b show
the timing for SPI/Microwire and QSPI operation.
The fully static 16-bit I/O register allows infinite time
between the two 8-bit read/write operations necessary
to obtain the full 16 bits of data with SPI and Microwire.
CS
must remain low during the entire two-byte transfer
(Figure 8a). QSPI allows a full 16-bit data transfer
(Figure 8b).
Interfacing to the 80C32 Microcontroller Family
Figure 7c shows the general 80C32 connection to the
MAX110/MAX111 using Port 1. For a more detailed dis-
cussion, see the MAX110 evaluation kit manual.
I/O S hift Register
Serial data transfer is accomplished with a 16-bit fully
static shift register. The 16-bit control word shifted into
this register during a data-transfer operation controls
the ADC’s various functions. The MSB (
NO-OP
)
enables/disables transfer of the control word within the
ADC. A logic 1 causes the remaining 15 bits in the con-
trol word to be transferred from the I/O register into the
control register when
CS
goes high, updating the
ADC’s configuration and starting a new conversion. If
I/O
SCK
MISO
MOSI
MASKABLE
INTERRUPT
SS
a. SPI/QSPI
+5V
μP
CS
SCLK
DOUT
DIN
BUSY
MAX110
MAX111
I/O
SK
SI
SO
MASKABLE
INTERRUPT or I/O
b. MICROWIRE
μP
CS
SCLK
DOUT
DIN
BUSY
P1.0
P1.1
P1.2
P1.3
P1.4
c. 80C51/80C32
μP
CS
SCLK
DIN
DOUT
BUSY
MAX110
MAX111
MAX110
MAX111
Figure 7. Common Serial-Interface Connections
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