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参数资料
| 型号： | EVAL-ADM2914EBZ |
| 厂商： | Analog Devices Inc |
| 文件页数： | 9/16页 |
| 文件大小： | 0K |
| 描述： | BOARD EVAL FOR ADM2914 |
| 标准包装： | 1 |
| 主要目的： | 电源管理，电源监控器/跟踪器/序列发生器 |
| 嵌入式： | 否 |
| 已用 IC / 零件： | ADM2914 |
| 主要属性： | 电压检测器和监控器 |
| 次要属性： | 开漏极输出 |
| 已供物品： | 板 |
Data Sheet
ADM2914
R Y + R Z
V PH = V UV ? ?
? = 0 . 5 V
? R X + R Y + R Z
?
( 0 . 5 ) ( V M )
( V UV )( I M )
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
overvoltage trip point, and V UV is the undervoltage trip point.
V M
R X ADM2914
V PH
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:
? ?
?
Because R Z is already known, R Y can be expressed as follows:
R Y = ? R Z
(2)
( V M )
( I M )
R Y
V PL
R Z
VHx
VLx
0.5V
UVx
OVx
When R Y and R Z are known, R X is calculated using the following
equation:
R X = ? R Z ? R Y (3)
If V M , I M , V OV , or V UV changes, each step must be recalculated.
Figure 17. Positive Undervoltage/Overvoltage Monitoring Configuration
tion. 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 connected to the
corresponding VHx pin, and the low-side voltage is connected
Negative Voltage Monitoring Scheme
voltage monitoring. To monitor the negative voltage, a 1 V
reference 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.
to the corresponding VLx pin.
To trigger an overvoltage condition, the low-side voltage (in this
R Z
REF
ADM2914
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:
V NH
VHx
OVx
R Z
V PL = V OV ? ?
?
? = 0 . 5 V
Also,
?
? R X + R Y + R Z
?
?
R Y
V NL
R X
VLx
0.5V
UVx
R X + R Y + R Z = M
( 0 . 5 ) ( V M )
( V OV )( I M )
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)
V M
Figure 18. Negative Undervoltage/Overvoltage Monitoring Configuration
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 subtracted 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 VH X pin, and the low-side voltage, V NL , is
connected to the corresponding VL X pin. Refer to the Voltage
Monitoring Example section for more information.
Rev. C | Page 9 of 16
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