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| 型号： | EVAL-CN0204-SDPZ |
| 厂商： | Analog Devices Inc |
| 文件页数： | 17/32页 |
| 文件大小： | 0K |
| 描述： | BOARD CFTL AD5662 AD5751 |
| 设计资源： | CN-0204 CFTL Eval/Design Support |
| 标准包装： | 1 |
| 系列： | Circuits from the Lab™ |
| 主要目的： | 参考设计，模拟输出模块 |
| 嵌入式： | 否 |
| 已用 IC / 零件： | AD5662，AD5751，ADuM1301，ADuM5401 |
| 主要属性： | 隔离 |
| 已供物品： | 板 |
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AD5751
Data Sheet
Rev. B | Page 24 of 32
DEFAULT REGISTERS AT POWER-ON
The AD5751 power-on-reset circuit ensures that all registers are
loaded with zero code.
In software SPI mode, the part powers up with all outputs
disabled (OUTEN bit = 0). The user must set the OUTEN bit in
the control register to enable the output and, in the same write,
set the output range configuration using the R3 to R0 bits.
If hardware mode is selected, the part powers up to the
conditions defined by the R3 to R0 bits and the status of the
OUTEN pin. It is recommended to keep the output disabled
when powering up the part in hardware mode.
RESET FUNCTION
In software mode, the part can be reset using the RESET pin
(active low) or the reset bit (reset = 1). A reset disables both the
current and voltage outputs to their power-on condition. The
user must write to the OUTEN bit to enable the output and, in
the same write, set the output range configuration. The RESET
pin is a level sensitive input; the part stays in reset mode as long
as the RESET pin is low. The reset bit clears to 0 following a
reset command to the control register.
In hardware mode, there is no reset. If using the part in
hardware mode, the RESET pin should be tied high.
OUTEN
In software mode, the output can be enabled or disabled using
the OUTEN bit in the control register. When the output is
disabled, both the current and voltage channels go into tristate.
The user must set the OUTEN bit to enable the output and
simultaneously set the output range configuration.
In hardware mode, the output can be enabled or disabled using
the OUTEN pin. When the output is disabled, both the current
and voltage channels go into tristate. The user must write to the
OUTEN pin to enable the output. It is recommended that the
output be disabled when changing the ranges.
SOFTWARE CONTROL
Software control is enabled by connecting the HW SELECT pin
to ground. In software mode, the AD5751 is controlled over a
versatile 3-wire serial interface that operates at clock rates up to
50 MHz. It is compatible with SPI, QSPI, MICROWIRE, and
DSP standards.
Input Shift Register
The input shift register is 16 bits wide. Data is loaded into the
device MSB first as a 16-bit word under the control of a serial
clock input, SCLK. Data is clocked in on the falling edge of SCLK.
The input shift register consists of 16 control bits, as shown in
Table 7. The timing diagram for this write operation is shown in
Figure 2. The first three bits of the input shift register are used to set
the hardware address of the AD5751 device on the printed circuit
board (PCB). Up to eight devices can be addressed per board.
Bit D11, Bit D1, and Bit D0 must always be set to 0 during any
write sequence.
Table 7. Input Shift Register Contents for a Write Operation—Control Register
MSB
LSB
D15
D14
D13
D12
D11
D10
D9
D8
D7
D6
D5
D4
D3
D2
D1
D0
A2
A1
A0
R/W
0
R3
R2
R1
R0
CLRSEL
OUTEN
Clear
RSET
Reset
0
Table 8. Input Shift Register Descriptions for Control Register
Bit
Description
A2, A1, A0
Used in association with the AD2, AD1, and AD0 external pins to determine which part is being addressed by the system
controller.
A2
A1
A0
Function
0
Addresses part with Pin AD2 = 0, Pin AD1 = 0, Pin AD0 = 0.
0
1
Addresses part with Pin AD2 = 0, Pin AD1 = 0, Pin AD0 = 1.
0
1
0
Addresses part with Pin AD2 = 0, Pin AD1 = 1, Pin AD0 = 0.
0
1
Addresses part with Pin AD2 = 0, Pin AD1 = 1, Pin AD0 = 1.
1
0
Addresses part with Pin AD2 = 1, Pin AD1 = 0, Pin AD0 = 0.
1
0
1
Addresses part with Pin AD2 = 1, Pin AD1 = 0, Pin AD0 = 1.
1
0
Addresses part with Pin AD2 = 1, Pin AD1 = 1, Pin AD0 = 0.
1
Addresses part with Pin AD2 = 1, Pin AD1 = 1, Pin AD0 = 1.
R/W
Indicates a read from or a write to the addressed register.
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