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參數(shù)資料
| 型號(hào)： | EVAL-AD7719EB |
| 廠商： | Analog Devices, Inc. |
| 英文描述： | Connector Backshell |
| 中文描述： | 低電壓，低功耗，工廠校準(zhǔn)，16-/24-Bit雙ADC |
| 文件頁(yè)數(shù)： | 19/40頁(yè) |
| 文件大?。?/td> | 367K |
| 代理商： | EVAL-AD7719EB |
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REV. 0
AD7719
–19–
Communications Register (A3, A2, A1, A0 = 0, 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 write operation, and to which register this operation takes place. For read or write operations, once 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 AD7719 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 32
serial clock cycles with DIN high, returns the AD7719 to this default state by resetting the part. Table IX outlines the bit designa-
tions for the Communications Register. CR0 through CR7 indicate the bit location, CR denoting the bits are in the Communications
Register. CR7 denotes the first bit of the data stream.
CR7
CR6
CR5
CR4
CR3
CR2
CR1
CR0
WEN
(0)
R/
W
(0)
0 (0)
0 (0)
A3 (0)
A2 (0)
A1 (0)
A0 (0)
Table IX. Communications Register Bit Designations
Bit
Location
Bit
Name
Description
CR7
WEN
Write Enable Bit. A 0 must be written to this bit so the write operation to the Communications Register
actually takes place. If a 1 is written to this bit, the part will not clock on to subsequent bits in the regis-
ter. It will stay at this bit location until a 0 is written to this bit. Once a 0 is written to the
WEN
bit, the
next seven bits will be loaded to the Communications Register.
A zero in this bit location indicates that the next operation will be a write to a specified register. A one in
this position indicates that the next operation will be a read from the designated register.
A zero must be written to this bit position to ensure correct operation of the AD7719.
A zero must be written to this bit position to ensure correct operation of the AD7719.
Register Address Bits. These address bits are used to select which of the AD7719
’
s registers are being
accessed during this serial interface communication. A3 is the MSB of the three selection bits.
CR6
R/
W
CR5
CR4
CR3
–
CR0
Zero
Zero
A3
–
A0
Table X. Register Selection Table
A3
A2
A1
A0
Register
0
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
0
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
0
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
Communications Register during a Write Operation
Status Register during a Read Operation
Mode Register
Main ADC Control Register (AD0CON)
Aux ADC Control Register (AD1CON)
Filter Register
Main ADC Data Register
Aux ADC Data Register
I/O Control Register
Main ADC Offset Calibration Register
Aux ADC Offset Calibration Register
Main ADC Gain Calibration Register
Aux ADC Gain Calibration Register
Test 1 Register
Test 2 Register
Undefined
ID Register
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