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ADM2914-1ARQZ Datenblatt(PDF) 8 Page - Analog Devices

Teilenummer ADM2914-1ARQZ
Bauteilbeschribung  Quad UV/OV Positive/Negative Voltage Supervisor
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ADM2914
Rev. 0 | Page 8 of 16
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
VH1
1.8V
VL1
VH2
VL2
VH3
VL3
VH4
VL4
SEL
TIMER
UV
OV
LATCH/DIS
REF
GND
VCC
ADM2914
2.5V
3.3V
5V
SYSTEM
PSU
OV
output pin.
Figure 16. Typical Applications Diagram
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, VCC,
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
voltage for monitoring is then connected as shown in Figure 18.
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
negative than the programmed threshold, and an overvoltage
condition occurs when the monitored voltage is more negative
than the configured threshold.
Table 5. Polarity Configuration
Input 3
Input 4
SEL Pin
Polarity
UV Condition
OV Condition
Polarity
UV Condition
OV Condition
Connected to V
CC
Positive
VH3 < 0.5 V
VL3 > 0.5 V
Positive
VH4 < 0.5 V
VL4 > 0.5 V
Left Unconnected
Positive
VH3 < 0.5 V
VL3 > 0.5 V
Negative
VL4 > 0.5 V
VH4 < 0.5 V
Connected to GND
Negative
VL3 > 0.5 V
VH3 < 0.5 V
Negative
VL4 > 0.5 V
VH4 < 0.5 V


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