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ADM2914-1ARQZ Datasheet(PDF) 5 Page - Analog Devices

Part # ADM2914-1ARQZ
Description  Quad UV/OV Positive/Negative
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Manufacturer  AD [Analog Devices]
Direct Link  http://www.analog.com
Logo AD - Analog Devices

ADM2914-1ARQZ Datasheet(HTML) 5 Page - Analog Devices

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ADM2914
Rev. B | Page 5 of 16
PIN CONFIGURATIONS AND FUNCTION DESCRIPTIONS
VH1 1
VL1 2
VH2 3
VL2 4
VCC
16
TIMER
15
SEL
14
LATCH
13
VH3 5
VL3 6
VH4 7
UV
12
OV
11
REF
10
VL4 8
GND
9
ADM2914-1
TOP VIEW
(Not to Scale)
VH1 1
VL1 2
VH2 3
VL2 4
VCC
16
TIMER
15
SEL
14
DIS
13
VH3 5
VL3 6
VH4 7
UV
12
OV
11
REF
10
VL4 8
GND
9
ADM2914-2
TOP VIEW
(Not to Scale)
Figure 2. ADM2914-1 Pin Configuration
Figure 3. ADM2914-2 Pin Configuration
Table 4. Pin Function Descriptions
Mnemonic
Pin No.
ADM2914-1
ADM2914-2
Description
1
VH1
VH1
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 VCC when not in use.
3
VH2
VH2
2
VL1
VL1
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.
4
VL2
VL2
5
VH3
VH3
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 VCC when not in use.
7
VH4
VH4
6
VL3
VL3
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.
8
VL4
VL4
9
GND
GND
Device Ground.
10
REF
REF
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 VCC 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
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.)
DIS
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 VCC or GND, or leave open to select one of three possible input polarity
configurations (see Table 5).
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 VCC to bypass the timer.
16
VCC
VCC
Supply Voltage. VCC 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.


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