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参数资料
| 型号： | EVAL-AD7195EBZ |
| 厂商： | Analog Devices Inc |
| 文件页数： | 11/45页 |
| 文件大小： | 0K |
| 描述： | BOARD EVAL FOR AD7195 |
| 设计资源： | EVAL-AD7195EBZ Schematic AD7195 Gerber Files |
| 标准包装： | 1 |
| 主要目的： | 接口，模拟前端（AFE） |
| 已用 IC / 零件： | AD7195 |
| 次要属性： | 图形用户界面，USB 接口 |
| 已供物品： | 板 |
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AD7195
Rev. 0 | Page 18 of 44
COMMUNICATIONS REGISTER
(RS2, RS1, RS0 = 0, 0, 0)
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 communications register determines whether the next
operation is a read or a write operation and in which register
this operation takes place. For read or write operations, when
the subsequent read or write operation 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 19 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
Table 19. Communications Register 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 on to 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
A 0 in this bit location indicates that the next operation is a write to a specified register. A 1 in this 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 20).
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, the Instruction 01011100 must be written
to the communications register. To disable continuous read, the Instruction 01011000 must be written to
the communications 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 are seen 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 20. 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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