參數(shù)資料
型號(hào)： EVAL-CN0204-SDPZ
廠(chǎng)商： Analog Devices Inc
文件頁(yè)數(shù)： 19/32頁(yè)
文件大?。?/td> 0K
描述： BOARD CFTL AD5662 AD5751
設(shè)計(jì)資源： CN-0204 CFTL Eval/Design Support
標(biāo)準(zhǔn)包裝： 1
系列： Circuits from the Lab™
主要目的： 參考設(shè)計(jì)，模擬輸出模塊
嵌入式： 否
已用 IC / 零件： AD5662，AD5751，ADuM1301，ADuM5401
主要屬性： 隔離
已供物品： 板
AD5751
Data Sheet
Rev. B | Page 26 of 32
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 AD5751 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 Table 9)
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.
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 is set, 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 AD5751 consists of an internal signal conditioning block
that maps the analog input voltage to a programmed output
range. The available analog input range is 0 V to 4.096 V.
For all ranges, both current and voltage, the AD5751 imple-
ments a straight linear mapping function, where 0 V maps to
the lower end of the selected range and 4.096 V 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 AD5751 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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