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參數資料
| 型號： | ADM9261 |
| 廠商： | Analog Devices, Inc. |
| 英文描述： | Triple- Power Supply Monitor(3路電源監視器) |
| 中文描述： | 三電源監視器（3路電源監視器） |
| 文件頁數： | 5/7頁 |
| 文件大?。?/td> | 224K |
| 代理商： | ADM9261 |
ADM9261
5
REV. 0
CIRCUIT INFORMATION
Monitor Inputs SU1 to SU3
The ADM9621 is provided with three analog inputs, SU1
to SU3, to monitor supply voltages of +9 V and two
+3.3V supplies. Each input is connected to a voltage
comparator whose trip point is set by an on-chip voltage
reference and on-chip precision thin-film resistors. On-
chip attenuators reduce the input voltage to the compara-
tors, so that voltages greater than the supply voltage can
be monitored without the need for external resistors. As
the ADM9261 is intended for battery-powered systems,
the input attenuators are high resistance to minimise cur-
rent drawn from the supplies. This, coupled with the low-
pwer design of the comparators themselves, gives a typical
current consumption of 10
μ
A, including the input currents
of SU1 to SU3.
Error Outputs
Error outputs
ERR1
to
ERR3
are open-drain outputs that
are OFF when the corresponding supply voltage SU1 to
SU3 is greater than its minimum value and ON when the
corresponding supply voltage falls below its minimum
value. Each output requires a 10k
pullup resistor to a
positive supply, which is normally the system logic supply,
but can be different if required. The open-drain construc-
tion allows two or more of these outputs to be wire
ANDed together if required, as shown in figure 1.
SU1
10k
W
V
CC
SU2
SU3
ERR3
ERR1
ERR2
V
CC
GND
OUTPUT
Truth Table for Wired AND
SU1
SU2
SU3
Output
< min
< min
< min
< min
> min
> min
> min
> min
< min
< min
> min
> min
< min
< min
> min
> min
< min
> min
< min
> min
< min
> min
< min
> min
0
0
0
0
0
0
0
1
Power Supply V
CC
The ADM9261 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. It will usually be powered from one of
the 3.3 V supplies.
The logic outputs are open-drain and take their output
high level from the voltage connected to the pull-up resis-
tor. They will normally be connected to V
CC
, but can be
connected to any voltage up to 15V if a different logic
swing is required.
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