参数资料
| 型号： | AD5421CREZ-RL7 |
| 厂商： | Analog Devices Inc |
| 文件页数： | 22/36页 |
| 文件大小： | 0K |
| 描述： | IC DAC 16BIT SPI/SRL 28TSSOP |
| 标准包装： | 1,000 |
| 设置时间： | 50µs |
| 位数： | 16 |
| 数据接口： | 串行，SPI? |
| 转换器数目： | 1 |
| 电压电源： | 单电源 |
| 功率耗散（最大）： | 625mW |
| 工作温度： | -40°C ~ 105°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 28-SOIC（0.173"，4.40mm 宽）裸露焊盘 |
| 供应商设备封装： | 28-TSSOP 裸露焊盘 |
| 包装： | 带卷 (TR) |
| 输出数目和类型： | 1 电压，单极 |
| 采样率（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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