參數(shù)資料
型號： AD5100
廠商： Analog Devices, Inc.
英文描述： System-Management IC with Programmable Quad Voltage Monitoring and Supervisory Functions
中文描述： 系統(tǒng)管理IC與可編程四路電壓監(jiān)測和監(jiān)督職能
文件頁數(shù)： 12/32頁
文件大?。?/td> 495K
代理商： AD5100
AD5100
Preliminary Technical Data
Rev. PrJ | Page 12 of 32
When the V
1MON
input drops below the programmed UV
threshold, the comparator will become active immediately,
indicating a UV condition has occurred. Similarly due to
hysteresis, the V
1MON
input must be brought above the
programmed UV threshold by 1.5% before the comparator
will be in-active, indicating the UV condition has gone away.
Both V1mon comparators are used (in conjunction with hold
and delay timers) to control the SHDN and RESET pins.
V
1MON
exhibits typical input resistance of 60KΩ that users
should account the loading effect.
The default V
1MON
OV and UV thresholds are 18.00V and
8.43V respectively. The default V
1MON
Shutdown Hold time
and Shutdown Delay are 200ms and 1200ms respectively.
User should refer to Tables 5b and 6b if they want to program
different settings.
V
2MON
V
2MON
is a high-voltage monitoring input that controls the
SHDN and RESET
functions of the external devices. V
2MON
monitors inputs from 3V to 30V. It has a 16-level
programmable Turn-on, Turn-off (ON,OFF) hysteresis
threshold with an 8-step 0.05ms-200ms shutdown hold time
and 0.05ms-1200ms shutdown delay.
By default, V
2MON
is level-sensitive that the ON and OFF
thresholds are both monitored. The ON threshold chosen
must be greater than the OFF threshold. When the shutdown
function is triggered by the input reaching V
2MON_OFF
threshold, such fault condition will be temporarily recorded
in the Fault Detection Register. The
SHDNWARN
output will
transition low for signaling before shutdown occurs. The
occurance of shutdown is depending on how long the
shutdown programmed-delay is set relative to the
SHDNWARN
propagation delay, this feature attempts to allow
the system to finish any critical house keeping tasks before
shuting down the external device. The V
2MON
, shutdown, and
shutdown warning pins timing diagrams are also shown in
Figure 5. The ranges of ON and OFF Thresholds are shown
in Tables 5a and the programming codes of the selected-
thresholds are found in Table 5b. The defaulted ON threshold
is 7.47V and OFF threshold is 6.95V. Simarily, the ranges of
shutdown hold and delay times are shown in Table 6a and the
programming codes of the selected-timings are found in
Table 6b. The defaulted shutdown hold time is 10ms and
delay time is 100ms.
V
2MON_OFF
will be ignored if V
2MON_OFF
> V
2MON_ON
but V
2MON_OFF
cannot be = V
2MON_ON.
If the V
2MON
is selected with Rising Edge Triggered, only the
ON threshold is monitored and the OFF Threshold is
ignored.
The voltage at V
1MON
provides the power for the AD5100 but
valid signal at V
2MON
must be present before the internal V
REG
starts operation. Details will be explained in the power
section.
V
1MON
V
1MON_OV
V
1MON_UV
Hysteresis
Hysteresis
OV
Active
OV
In-Active
UV
Active
UV
In-Active
Comparator
Comparator
Comparator
Comparator
Figure 6. V
1MON
Hysteresis.
The V
2MON
pin is monitored by 2 comparators, 1 for turn-on,
and 1 for turn-off detection in the level sensitive power-up
mode. Both are designed with 1.5% hysteresis. On the other
hand, the turn-on monitoring comparator is used only if the
rising edge trigger power-up mode is selected.
When the V
2MON
input goes above the programmed Ton
threshold, the comparator will become active immediately,
indicating an OV condition has occurred. Due to hysteresis,
the V
2MON
input must be brought below the programmed
threshold by 1.5% before the comparator will be in-active,
indicating the OV condition has gone away, see Figure 7.
When the V
2MON
input drops below the programmed
threshold, the comparator will become active immediately,
indicating a UV condition has occurred. Similarly due to
hysteresis, the V
2MON
input must be brought above the
programmed threshold by 1.5% before the comparator will be
in-active, indicating the UV condition has gone away.
V
2MON
V
2MON_ON
V
2MON_OFF
Hysteresis
Hysteresis
ON
Active
ON
In-Active
OFF
Active
OFF
In-Active
Comparator
Comparator
Comparator
Comparator
Figure 7. V
2MON
Hysteresis.
V
2MON
exhibits typical input resistance of 60KΩ that users
should account the loading effect.
The default V
2MON
ON and OFF thresholds are 7.47V and
6.95V respectively. The default V
2MON
Shutdown Hold time
and Shutdown Delay are 10ms and 100ms respectively. User
should refer to Tables 5b and 6b if they want to program
different settings.
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