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| 型號： | EVAL-AD5750EBZ |
| 廠商： | Analog Devices Inc |
| 文件頁數(shù)： | 21/36頁 |
| 文件大?。?/td> | 0K |
| 描述： | BOARD EVAL FOR AD5750 |
| 標準包裝： | 1 |
| 主要目的： | 電源管理，專用：電流/電壓輸出驅(qū)動器 |
| 已用 IC / 零件： | AD5750 |
| 主要屬性： | 電流（±20mA）或電壓（±10V）輸出模式 |
| 次要屬性： | ±12 V ~ 24 V 電源電壓 |
| 已供物品： | 板 |
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AD5750/AD5750-1
Rev. C | Page 28 of 36
Readback Operation
Readback mode is activated by selecting the correct device address
(A2, A1, A0) and then setting the R/W bit to 1. By default, the
SDO pin is disabled. After having addressed the AD5750/
AD5750-1 for a read operation, setting R/W to 1 enables the
SDO pin and SDO data is clocked out on the 5th rising edge of
SCLK. After the data has been clocked out on SDO, a rising
edge on SYNC disables (tristate) the SDO pin again. Status
register data (see
) and control register data are both
available during the same read cycle.
The status bits comprise four read-only bits. They are used to
notify the user of specific fault conditions that occur, such as
an open circuit or short circuit on the output, overtemperature
error, or an interface error. If any of these fault conditions occur,
a hardware FAULT is also asserted low, which can be used as a
hardware interrupt to the controller.
See the Detailed Description of Features section for a full
explanation of fault conditions.
HARDWARE CONTROL
Hardware control is enabled by connecting the HW SELECT
pin to DVCC. In this mode, the R3, R2, R1, and R0 pins in
conjunction with the RSET pin are used to configure the output
range, as per Table 8.
In hardware mode, there is no status register. The fault condi-
tions (open circuit, short circuit, and overtemperature) are
available on Pin IFAULT, Pin VFAULT, and Pin TEMP. If any
one of these fault conditions are set, then a low is asserted on
the specific fault pin. IFAULT, VFAULT, and TEMP are open-
drain outputs and therefore can be connected together to allow
the user to generate one interrupt to the system controller to
communicate a fault. If hardwired in this way, it is not possible
to isolate which fault occurred in the system.
TRANSFER FUNCTION
The AD5750/AD5750-1 consist of an internal signal
conditioning block that maps the analog input voltage to a
programmed output range. The available analog input ranges
are 0 V to 4.096 V (AD5750) and 0 V to 2.5 V (AD5750-1).
For all ranges, both current and voltage, the AD5750 and
AD5750-1 implement a straight linear mapping function, where
0 V maps to the lower end of the selected range and 4.096 V (or
2.5 V for AD5750-1) maps to the upper end of the selected range.
Table 9. Input Shift Register Contents for a Read Operation—Status Register
MSB
LSB
D15
D14
D13
D12
D11
D10
D9
D8
D7
D6
D5
D4
D3
D2
D1
D0
A2
A1
A0
1
0
R3
R2
R1
R0
CLRSEL
OUTEN
RSET
PEC error
OVER TEMP
IOUT fault
VOUT fault
Table 10. Status Bit Options
Bit
Description
PEC Error
This bit is set if there is an interface error detected by CRC-8 error checking. See the Detailed Description of Features section.
OVER TEMP
This bit is set if the AD5750/AD5750-1 core temperature exceeds approximately 150°C.
IOUT Fault
This bit is set if there is an open circuit on the IOUT pin.
VOUT Fault
This bit is set if there is a short circuit on the VOUT pin.
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