參數(shù)資料
型號： AD7193BRUZ-REEL
廠商： Analog Devices Inc
文件頁數(shù)： 16/57頁
文件大小： 0K
描述： IC ADC 24BIT SPI 4.8KHZ 28TSSOP
標準包裝： 2,500
位數(shù)： 24
采樣率（每秒）： 4.8k
數(shù)據(jù)接口： DSP，MICROWIRE?，QSPI?，串行，SPI?
轉(zhuǎn)換器數(shù)目： 1
電壓電源： 模擬和數(shù)字
工作溫度： -40°C ~ 105°C
安裝類型： 表面貼裝
封裝/外殼： 28-TSSOP（0.173"，4.40mm 寬）
供應商設備封裝： 28-TSSOP
包裝： 帶卷 (TR)
輸入數(shù)目和類型： 4 個差分，單極；4 個差分，雙極；8 個偽差分，單極；8 個偽差分，雙極
AD7193
Data Sheet
Rev. D | Page 22 of 56
COMMUNICATIONS REGISTER
RS2, RS1, RS0 = 000
The communications register is an 8-bit write-only register. All
communications to the part must start with a write operation to
the communications register. The data written to the communi-
cations register determine whether the next operation is a read
or write operation and in which register this operation occurs. For
read or write operations, when the subsequent read or write oper-
ation to the selected register is complete, the interface returns to
where it expects a write operation to the communications register.
This is the default state of the interface and, on power-up or after
a reset, the ADC is in this default state waiting for a write
operation to the communications register. In situations where the
interface sequence is lost, a write operation of at least 40 serial
clock cycles with DIN high returns the ADC to this default state
by resetting the entire part. Table 17 outlines the bit designations
for the communications register. CR0 through CR7 indicate the
bit location, CR denoting that the bits are in the communications
register. CR7 denotes the first bit of the data stream. The number
in parentheses indicates the power-on/reset default status of
that bit.
CR7
CR6
CR5
CR4
CR3
CR2
CR1
CR0
WEN(0)
R/W(0)
RS2(0)
RS1(0)
RS0(0)
CREAD(0)
0(0)
Table 17. Communications Register (CR) Bit Designations
Bit Location
Bit Name
Description
CR7
WEN
Write enable bit. For a write to the communications register to occur, 0 must be written to this bit. If a 1 is
the first bit written, the part does not clock onto subsequent bits in the register; rather, it stays at this bit
location until a 0 is written to this bit. After a 0 is written to the WEN bit, the next seven bits are loaded to
the communications register. Idling the DIN pin high between data transfers minimizes the effects of
spurious SCLK pulses on the serial interface.
CR6
R/W
0 in this bit location indicates that the next operation is a write to a specified register.
1 in this bit position indicates that the next operation is a read from the designated register.
CR5 to CR3
RS2 to RS0
Register address bits. These address bits are used to select which registers of the ADC are selected during
the serial interface communication (see Table 18).
CR2
CREAD
Continuous read of the data register. When this bit is set to 1 (and the data register is selected), the serial
interface is configured so that the data register can be continuously read; that is, the contents of the data
register are automatically placed on the DOUT pin when the SCLK pulses are applied after the RDY pin
goes low to indicate that a conversion is complete. The communications register does not have to be
written to for subsequent data reads. To enable continuous read, Instruction 01011100 must be written to the
communications register. To disable continuous read, Instruction 01011000 must be written to the communica-
tions register while the RDY pin is low. While continuous read is enabled, the ADC monitors activity on the
DIN line so that it can receive the instruction to disable continuous read. Additionally, a reset occurs if
40 consecutive 1s occur on DIN; therefore, hold DIN low until an instruction is written to the device.
CR1 to CR0
0
These bits must be programmed to Logic 0 for correct operation.
Table 18. Register Selection
RS2
RS1
RS0
Register
Register Size
0
Communications register during a write operation
8 bits
0
Status register during a read operation
8 bits
0
1
Mode register
24 bits
0
1
0
Configuration register
24 bits
0
1
Data register/data register plus status information
24 bits/32 bits
1
0
ID register
8 bits
1
0
1
GPOCON register
8 bits
1
0
Offset register
24 bits
1
Full-scale register
24 bits
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