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參數(shù)資料
| 型號： | AD5421BREZ |
| 廠商： | Analog Devices Inc |
| 文件頁數(shù)： | 22/36頁 |
| 文件大小： | 0K |
| 描述： | IC DAC 16BIT 1.8-12V 28TSSOP |
| 標(biāo)準(zhǔn)包裝： | 50 |
| 設(shè)置時間： | 50µs |
| 位數(shù)： | 16 |
| 數(shù)據(jù)接口： | 串行，SPI? |
| 轉(zhuǎn)換器數(shù)目： | 1 |
| 電壓電源： | 單電源 |
| 功率耗散（最大）： | 625mW |
| 工作溫度： | -40°C ~ 105°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 28-SOIC（0.173"，4.40mm 寬）裸露焊盤 |
| 供應(yīng)商設(shè)備封裝： | 28-TSSOP 裸露焊盤 |
| 包裝： | 管件 |
| 輸出數(shù)目和類型： | 1 電壓，單極 |
| 采樣率（每秒）： | * |
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Data Sheet
AD5421
Rev. G | Page 29 of 36
FAULT REGISTER
The read-only fault register is addressed as described in Table 12. The bits in the fault register indicate a range of possible fault conditions.
Table 19. Fault Register Bit Map
MSB
LSB
D15
D14
D13
D12
D11
D10
D9
D8
D7
D6
D5
D4
D3
D2
D1
D0
SPI
PEC
ILOOP
Over
ILOOP
Under
Temp
140°C
Temp
100°C
VLOOP
6V
VLOOP
12V
VLOOP/temperature value
Table 20. Fault Register Bit Descriptions
Fault Alert
FAULT
Pin Set
Description
SPI
Yes
This bit is set high to indicate the loss of the SPI interface signaling. This fault occurs if there is no valid
communication to the AD5421 over the SPI interface for more than the user-defined timeout period. The
occurrence of this fault also forces the loop current to the alarm value if Bit D10 of the control register is at
Logic 0. The alarm current direction is determined by the state of the ALARM_CURRENT_DIRECTION pin.
PEC (packet
error check)
Yes
This bit is set high when an error in the SPI communication is detected using cyclic redundancy check (CRC)
error detection. See the Packet Error Checking section for more information.
ILOOP Over
Yes
This bit is set high when the actual loop current is greater than the programmed loop current.
ILOOP Under
Yes
This bit is set high when the actual loop current is less than the programmed loop current.
Temp 140°C
Yes
This bit is set high to indicate an overtemperature fault. This bit is set if the die temperature of the AD5421
exceeds approximately 140°C. This bit is cleared when the temperature returns below approximately 125°C.
Temp 100°C
No
This bit is set high to indicate an increasing temperature of the AD5421. This bit is set if the die temperature of the
AD5421 exceeds approximately 100°C. This bit is cleared when the temperature returns below approximately 85°C.
VLOOP 6V
Yes
This bit is set high when the voltage between the VLOOP and COM pins falls below approximately 0.3 V (representing
a 6 V loop supply voltage with 20:1 resistor divider connected at VLOOP). This bit is cleared when the voltage returns
above approximately 0.4 V.
VLOOP 12V
No
This bit is set high when the voltage between the VLOOP and COM pins falls below approximately 0.6 V (representing
a 12 V loop supply voltage with 20:1 resistor divider connected at VLOOP). This bit is cleared when the voltage returns
above approximately 0.7 V.
VLOOP/temper-
ature value
N/A
These eight bits represent either the voltage between the VLOOP and COM pins or the AD5421 die temperature,
depending on the setting of Bit D8 of the control register (see the On-Chip ADC Transfer Function Equations
section).
8-Bit Value
VLOOP COM Voltage (V)
Die Temperature (°C)
00000000
0
+312
…
11111111
2.49
86
On-Chip ADC Transfer Function Equations
The transfer function equation for the measurement of the
voltage between the VLOOP and COM pins is as follows:
VLOOP COM = (2.5/256) × D
where D is the 8-bit digital code returned by the on-chip ADC.
The transfer function equation for the die temperature is
as follows:
Die Temperature = (1.559 × D) + 312
where D is the 8-bit digital code returned by the on-chip ADC.
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