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| 型号： | EVAL-ADM2914EBZ |
| 厂商： | Analog Devices Inc |
| 文件页数： | 8/16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 |
ADM2914
THEORY OF OPERATION
VOLTAGE SUPERVISION
The ADM2914 supervises up to four voltage rails for overvol-
tage and undervoltage conditions. Two pins, VHx and VLx, are
assigned to monitor each rail, one for overvoltage detection and
the other for undervoltage detection. Each pin is connected to
the input of an internal voltage comparator, and its voltage level
is internally compared with a 0.5 V voltage reference with
accuracy of ±1.5%.
The output of each of the internal undervoltage comparators is
tied to a common UV output pin. Likewise, the outputs of the
internal overvoltage comparators are tied to a common OV
output pin.
Data Sheet
POLARITY CONFIGURATION
The ADM2914 is capable of monitoring supply voltages of both
positive and negative polarities. The SEL pin is a three-state pin
that determines the polarity of Input 3 and Input 4. As summa-
rized in Table 5, the SEL pin is either connected to GND, V CC ,
or left unconnected.
When an input is configured to monitor a positive voltage, using
the three-resistor scheme shown in Figure 17, VHx is connected
to the high-side tap of the resistor divider and VLx is connected
to the low-side tap of the resistor divider.
Conversely, when an input is configured to monitor a negative
voltage, UVx and OVx are swapped internally. The negative
PSU
5V
3.3V
2.5V
1.8V
VHx is still connected to the high-side tap and VLx is still
connected to the low-side tap. Within this configuration, an
undervoltage condition occurs when the monitored voltage is less
VH1
VL1
VH2
V CC
SEL
TIMER
SYSTEM
negative than the programmed threshold, and an overvoltage
condition occurs when the monitored voltage is more negative
than the configured threshold.
ADM2914
VL2
VH3
VL3
VH4
VL4
REF
UV
OV
LATCH/DIS
GND
Figure 16. Typical Applications Diagram
Table 5. Polarity Configuration
Input 3
Input 4
SEL Pin
Connected to V CC
Left Unconnected
Connected to GND
Polarity
Positive
Positive
Negative
UV Condition
VH3 < 0.5 V
VH3 < 0.5 V
VL3 > 0.5 V
OV Condition
VL3 > 0.5 V
VL3 > 0.5 V
VH3 < 0.5 V
Polarity
Positive
Negative
Negative
UV Condition
VH4 < 0.5 V
VL4 > 0.5 V
VL4 > 0.5 V
OV Condition
VL4 > 0.5 V
VH4 < 0.5 V
VH4 < 0.5 V
Rev. C | Page 8 of 16
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