参数资料
| 型号： | ADM12914-2ARQZ |
| 厂商： | Analog Devices Inc |
| 文件页数： | 10/16页 |
| 文件大小： | 0K |
| 描述： | IC MONITOR QUAD UV/OV 16QSOP |
| 产品培训模块： | Voltage Supervisor 101 |
| 标准包装： | 98 |
| 类型： | 多压监控器 |
| 监视电压数目： | 4 |
| 输出： | 开路漏极或开路集电极 |
| 复位： | 低有效 |
| 复位超时： | 可调节/可选择 |
| 电压 - 阀值： | 可调节/可选择 |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 16-SSOP（0.154"，3.90mm 宽） |
| 供应商设备封装： | 16-QSOP |
| 包装： | 管件 |
( V M )
( I M )
ADM12914
MONITORING PIN CONNECTIONS
Positive Voltage Monitoring Scheme
When monitoring a positive supply, the desired nominal
operating voltage for monitoring is denoted by V M , I M is the
nominal current through the resistor divider, V OV is the over-
voltage trip point, and V UV is the undervoltage trip point.
V M
Data Sheet
When R Y and R Z are known, R X is calculated using the following
formula:
R X = ? R Z ? R Y (3)
If V M , I M , V OV , or V UV change, each step must be recalculated.
Negative Voltage Monitoring Scheme
R X
ADM12914
voltage monitoring. To monitor a negative voltage, a 1 V reference
V NH
R Y
V NL
R Z
VHx
VLx
0.5V
UVx
OVx
voltage is required to connect to the end node of the voltage
divider circuit. This reference voltage is generated internally
and is output through the REF pin.
ADM12914
REF
R Z
V PH
Figure 17. Positive Undervoltage/Overvoltage Monitoring Configuration
VHx
OVx
R Y
0.5V
nection. Three external resistors, R X , R Y , and R Z , divide the
positive voltage for monitoring,V M , into high-side voltage,
V PH , and low-side voltage, V PL . The high-side voltage is con-
V PL
R X
VLx
UVx
R Z
V PL = V OV ? ?
? = 0 . 5 V
? R X + R Y + R Z
?
R X Y + R Z = M
+ R
( 0 . 5 ) ( V M )
( V OV )( I M )
nected to the corresponding VHx pin and the low-side voltage
is connected to the corresponding VLx pin.
To trigger an overvoltage condition, the low-side voltage (in this
case, V PL ) must exceed the 0.5 V threshold on the VLx pin. The
low-side voltage, V PL , is given by the following equation:
? ?
?
Also,
V
I M
Therefore, R Z , which sets the desired trip point for the overvoltage
monitor, is calculated using the following equation:
R Z = (1)
To trigger the undervoltage condition, the high-side voltage,
V PH , must exceed the 0.5 V threshold on the VHx pin. The
high-side voltage, V PH , is given by the following equation:
V M
Figure 18. Negative Undervoltage/Overvoltage Monitoring Configuration
Monitoring Scheme section need some minor modifications for
use with negative voltage monitoring. The 1 V reference voltage
is added to the overall voltage drop; it must therefore be sub-
tracted from V M , V UV , and V OV before using each in the previous
equations.
To monitor a negative voltage level, the resistor divider circuit
divides the voltage differential level between the 1 V reference
voltage and the negative supply voltage into high-side voltage,
V NH , and low-side voltage, V NL . Similar to the positive voltage
monitoring scheme, the high-side voltage, V NH , is connected to
the corresponding VHx pin and the low-side voltage, V NL , is
connected to the corresponding VLx pin. Refer to the Voltage
Monitoring Example section for further information.
THRESHOLD ACCURACY
The reset threshold accuracy is fundamental, especially at lower
voltage levels. Consider an FPGA application that requires a 1 V
R Y + R Z
V PH = V UV ? ?
? = 0 . 5 V
?
?
? R X + R Y + R Z
?
?
core voltage input with a tolerance of ±5%, where the supply has
to ensure the supply is within the FPGA input voltage requirement
( 0 . 5 ) ( V M )
( V UV )( I M )
Because R Z is already known, R Y can be expressed as follows:
R Y = ? R Z
(2)
range, its voltage level must be monitored for UV and OV condi-
tions. The voltage swing on the supply itself causes the voltage
band available for setting the monitoring threshold to be quite
narrow. In this example, the threshold voltages, including the
Rev. D | Page 10 of 16
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相关代理商/技术参数 |
参数描述 |
|---|---|
| ADM12914-2ARQZ-RL7 | 制造商:Analog Devices 功能描述: |
| ADM1293-1AACPZ | 功能描述:IC MONITOR QUAD UV/OV 16LFCSP 制造商:analog devices inc. 系列:- 包装:托盘 零件状态:有效 输入阻抗:- 测量误差:- 电压 - I/O 高:1.1V 电压 - I/O 低:0.4V，0.8V，1.5V 电流 - 电源:3.6mA 电压 - 电源:2.95 V ~ 20 V 表计类型:单相 工作温度:-40°C ~ 105°C 安装类型:表面贴装 封装/外壳:16-WQFN 裸露焊盘 供应商器件封装:16-LFCSP-WQ（4x4） 标准包装:1 |
| ADM1293-1AACPZ-RL7 | 功能描述:IC MONITOR QUAD UV/OV 16LFCSP 制造商:analog devices inc. 系列:- 包装:带卷（TR） 零件状态:有效 输入阻抗:- 测量误差:- 电压 - I/O 高:1.1V 电压 - I/O 低:0.4V，0.8V，1.5V 电流 - 电源:3.6mA 电压 - 电源:2.95 V ~ 20 V 表计类型:单相 工作温度:-40°C ~ 105°C 安装类型:表面贴装 封装/外壳:16-WQFN 裸露焊盘 供应商器件封装:16-LFCSP-WQ（4x4） 标准包装:1,500 |
| ADM1293-1AARUZ | 功能描述:IC MONITOR QUAD UV/OV 14TSSOP 制造商:analog devices inc. 系列:- 包装:管件 零件状态:有效 输入阻抗:- 测量误差:- 电压 - I/O 高:1.1V 电压 - I/O 低:0.4V，0.8V，1.5V 电流 - 电源:3.6mA 电压 - 电源:2.95 V ~ 20 V 表计类型:单相 工作温度:-40°C ~ 105°C 安装类型:表面贴装 封装/外壳:14-TSSOP（0.173"，4.40mm 宽） 供应商器件封装:14-TSSOP 标准包装:96 |
| ADM1293-1AARUZ-RL7 | 功能描述:IC MONITOR QUAD UV/OV 14TSSOP 制造商:analog devices inc. 系列:- 包装:带卷（TR） 零件状态:有效 输入阻抗:- 测量误差:- 电压 - I/O 高:1.1V 电压 - I/O 低:0.4V，0.8V，1.5V 电流 - 电源:3.6mA 电压 - 电源:2.95 V ~ 20 V 表计类型:单相 工作温度:-40°C ~ 105°C 安装类型:表面贴装 封装/外壳:14-TSSOP（0.173"，4.40mm 宽） 供应商器件封装:14-TSSOP 标准包装:1,000 |
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