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参数资料
| 型号： | EVAL-ADM2914EBZ |
| 厂商： | Analog Devices Inc |
| 文件页数： | 5/16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
PIN CONFIGURATIONS AND FUNCTION DESCRIPTIONS
ADM2914
VH1 1
VL1 2
VH2 3
16
15
14
V CC
TIMER
SEL
VH1 1
VL1 2
VH2 3
16
15
14
V CC
TIMER
SEL
VL2 4
VH3 5
VL3 6
VH4 7
VL4 8
ADM2914-1
TOP VIEW
(Not to Scale)
13
12
11
10
9
LATCH
UV
OV
REF
GND
VL2 4
VH3 5
VL3 6
VH4 7
VL4 8
ADM2914-2
TOP VIEW
(Not to Scale)
13
12
11
10
9
DIS
UV
OV
REF
GND
Figure 2. ADM2914-1 Pin Configuration
Table 4. Pin Function Descriptions
Mnemonic
Figure 3. ADM2914-2 Pin Configuration
Pin No.
1
3
2
4
5
7
ADM2914-1
VH1
VH2
VL1
VL2
VH3
VH4
ADM2914-2
VH1
VH2
VL1
VL2
VH3
VH4
Description
Voltage High Input 1 and Voltage High Input 2. If the voltage monitored by VH1 or VH2 drops
below 0.5 V, an undervoltage condition is detected. Connect to V CC when not in use.
Voltage Low Input 1 and Voltage Low Input 2. If the voltage monitored by VL1 or VL2 rises above
0.5 V, an overvoltage condition is detected. Tie to GND when not in use.
Voltage High Input 3 and Voltage High Input 4. The polarity of these inputs is determined by the
state of the SEL pin (see Table 5). When the monitored input is configured as a positive voltage
and the voltage monitored by VH3 or VH4 drops below 0.5 V, an undervoltage condition is
detected. Conversely, when the input is configured as a negative voltage and the input drops
below 0.5 V, an overvoltage condition is detected. Connect to V CC when not in use.
6
8
VL3
VL4
VL3
VL4
Voltage Low Input 3 and Voltage Low Input 4. The polarity of these inputs is determined by the
state of the SEL pin (see Table 5). When the monitored input is configured as a positive voltage
and the voltage monitored by VL3 or VL4 rises above 0.5 V, an overvoltage condition is detected.
Conversely, when the input is configured as a negative voltage and the input rises above 0.5 V, an
undervoltage condition is detected. Tie to GND when not in use.
9
10
GND
REF
GND
REF
Device Ground.
Buffered Reference Output. This pin is a 1 V reference that is used as an offset when monitoring
negative voltages. This pin can source or sink 1 mA, and drive loads up to 1 nF. Larger capacitive
loads may lead to instability. Leave unconnected when not in use.
11
OV
OV
Overvoltage Reset Output. OV is asserted low if a negative polarity input voltage drops below its
associated threshold or if a positive polarity input voltage exceeds its threshold. The ADM2914-1
allows OV to be latched low. The ADM2914-2 holds OV low for an adjustable timeout period
determined by the TIMER capacitor. This pin has a weak pull-up to VCC and can be pulled up to
16 V externally. Leave this pin unconnected when not in use.
12
UV
UV
Undervoltage Reset Output. UV is asserted low if a negative polarity input voltage exceeds its
associated threshold or if a positive polarity input voltage drops below its threshold. UV is held
low for an adjustable timeout period set by the external capacitor tied to the TIMER pin. The UV
pin has a weak pull-up to V CC and can be pulled up to 16 V externally via an external pull-up
resistor. Leave this pin unconnected when not in use.
13
LATCH
DIS
OV Latch Bypass Input/Clear Pin. When pulled high, the OV latch is cleared. When held high, the
OVoutput has the same delay and output characteristics as the UV output. When pulled low, the
OV output is latched when asserted. (Applies only to the ADM2914-1.)
OV and UV Disable Input. When pulled high, the OV and UV outputs are held high irrespective of
the state of the VHx and VLx input pins. However, if a UVLO condition occurs, the OV and UV
outputs are asserted. This pin has a weak internal pull-down (2 μA) to GND. Leave this pin
unconnected when not in use. (Applies only to the ADM2914-2.)
14
SEL
SEL
Input Polarity Select. This three-state input pin allows the polarity of VH3, VL3, VH4, and VL4 to be
configured. Connect to V CC or GND, or leave open to select one of three possible input polarity
15
TIMER
TIMER
Adjustable Reset Delay Timer. Connect an external capacitor to the TIMER pin to program the
reset timeout delay. Refer to Figure 15 in the Typical Performance Characteristics section.
Connect this pin to V CC to bypass the timer.
16
V CC
V CC
Supply Voltage. V CC operates as a direct supply for voltages up to 6 V. For voltages greater than
6 V, it operates as a shunt regulator. A dropper resistor must be used in this configuration to limit
the current to less than 10 mA. When used without the resistor, the voltage at this pin must not
exceed 6 V. A 0.1 μF bypass capacitor or greater should be used.
Rev. C | Page 5 of 16
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