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參數(shù)資料
ADM9264
–5–
REV. 0
CIRCUIT INFORMATION
Monitor Inputs SU1 to SU4
The ADM9624 is provided with four analog inputs, SU1 to
SU4, to monitor supply voltages of +12 V, +5 V, +3.3 V and
+2.8 V. Each input is connected to a window comparator con-
sisting of a pair of voltage comparators and a two-input NOR
gate. Each pair of comparators obtains a reference voltage
from a precision internal reference, and each input to be
monitored is connected to the comparators via a precision,
thin film attenuator, whose resistor ratios determine the trip
points of each comparator. As the input voltages are attenu-
ated before reaching the comparators, they may exceed the
supply voltage of the ADM9264 without exceeding the com-
mon-mode or differential input range of the comparators.
When the input voltage is within limits, the outputs of both
comparators are low, so the output of the NOR gate is high. If
the voltage on the inverting input of the low comparator falls
below the reference voltage, or the voltage on the noninverting
input of the high comparator rises above the reference voltage,
the output of the NOR gate will go low.
Error Outputs
Error outputs
ERR1
to
ERR4
are open-drain outputs that are
OFF (high) when the corresponding input voltage is within
limits and ON (low) when the input is out of limit. Each error
output requires a 10 k
pull-up resistor to a positive supply,
which may be different from V
CC
if required. The open-drain
construction allows two or more of these outputs to be wire-
ANDed together if required.
Auxiliary Inputs ERRX,
ERRY
ERRX and
ERRY
are TTL-compatible auxiliary inputs that
allow external signals such as temperature alarms to be linked
into the ADM9264. ERRX is active high and forces PWROK
low when it is high.
ERRY
is active low and forces PWROK low
when it is low.
DIS Input
The disable input, DIS, is a TTL-compatible input. It overrides
all other inputs to the PWROK logic and forces PWROK high
when it is high.
SU4DET Input
SU4DET is a TTL-compatible input that disables the
ERR4
output, causing
ERR4
to go high when SU4DET is high. This
allows the SU4 input to be disabled easily for systems that do
not have a 2.8 V supply.
PWROK Output
The PWROK output combines the four error outputs and the
auxiliary inputs to give a common “Power OK” output. If the
four error outputs are high, ERRX is low,
ERRY
is high and
DIS is low then PWROK is high, otherwise PWROK is low.
PWROK is an open-drain output and requires a 10K pull-up
resistor to a positive supply, which may be different from V
CC
if
required.
A truth table for the PWROK output is following.
Truth Table
DIS ERRX
ERRY ERR4 ERR3 ERR2 ERR1
PWROK
0
0
0
0
0
0
0
1
0
X
X
X
X
X
1
X
1
X
X
X
X
0
X
X
1
X
X
X
0
X
X
X
1
X
X
0
X
X
X
X
1
X
0
X
X
X
X
X
1
0
X
X
X
X
X
X
1
0
0
0
0
0
0
1
X = don’t care.
Power Supply V
CC
The ADM9264 can be powered from any supply voltage between
2.5 V and 6 V. This includes any of the supply voltages apart
from that connected to SU1, since this is greater than 6 V.
The logic outputs are open-drain and take their output high
level from the voltage connected to the pull-up resistor, so they
are not dependent on the value of V
CC
.
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相關(guān)代理商/技術(shù)參數(shù) |
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| ADM9264ARNZ | 制造商:Analog Devices 功能描述:Volt Supervisor Monitor 2.8V/3.3V/5V/12V 16-Pin SOIC N 制造商:Analog Devices 功能描述:Microprocessor Supervisor |
| ADM9511 | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
| ADM9690 | 制造商:AD 制造商全稱:Analog Devices 功能描述:Power Supply and Watchdog Timer Monitoring Circuit |
| ADM9690AR | 制造商:AD 制造商全稱:Analog Devices 功能描述:Power Supply and Watchdog Timer Monitoring Circuit |
| ADM9690ARN | 制造商:Rochester Electronics LLC 功能描述:SUPERVISOR WITH 2 RESETS I.C. - Bulk 制造商:Analog Devices 功能描述:SUPERVISORY CIRCUIT 9690 SOIC8 |
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