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參數(shù)資料
| 型號(hào)： | 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)： | 11/32頁 |
| 文件大小： | 495K |
| 代理商： | AD5100 |
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Preliminary Technical Data
AD5100
Rev. PrJ | Page 11 of 32
MR
0 – 5 V
√
Highest Prority on
Other Inputs
Leave Floating
Monitoring Inputs
V
1MON
V
1MON
is a high-voltage monitoring input that controls the
SHDN and RESET
functions of the external devices. In
addition, it also provides a shutdown warning to the system.
V
1MON
monitors inputs from 6V to 30V. It has a 16-level
programmable over-voltage, under-voltage (OV,UV)
shutdown threshold with an 8-step 0.05ms-200ms shutdown
hold time and 0.05ms-1200ms shutdown delay. The
shutdown hold time means that the shutdown of the external
device is held until the programmed-time is reached. On the
other hand, the shutdown delay means that shuting down the
external device is delayed until the programmed-time is
reached.
The OV threshold chosen must be greater than the UV
threshold. When the shutdown is triggered either because the
input has reached OV or UV 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
1MON
, shutdown, and shutdown warning timing
diagrams are shown in Figure 5. The ranges of OV and UV
Thresholds are shown in Table 5a and the programming
codes of the selected-thresholds are found in Table 5b. The
defaulted OV threshold is 18.00V and UV threshold is 8.43V.
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 200ms delay time is 1200ms.
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.
* = Programmable
V
2MON
V
2MON_OFF *
t
GLITCH
t
t
2SD_HOLD *
t
2SD_HOLD *
t
1SD_DELAY *
V
1MON
V
1MON_OV *
V
1MON_UV *
t
GLITCH
t
1SD_HOLD *
SHDN
t
2SD_DELAY *
SHDNWARN
t
FD_DELAY
t
FD_DELAY
t
FD_DELAY
t
FD_DELAY
t
MIN#
#: The duration of the t
MIN
must be shorter than t
VREG_Off_Delay
or else the AD5100 will be powered off
V
2MON_ON *
t
1SD_HOLD *
t
1SD_DELAY *
Figure 5. V
1MON
and V
2MON
Shutdown Timing Diagrams (Note
RESET
follows
SHDN
).
The V
1MON
pin is monitored by two comparators, one for
over-voltage, and one for under-voltage detection. Both are
designed with 1.5% hysteresis.
When the V
1MON
n input goes above the programmed OV
threshold, the comparator will become active immediately,
indicating an OV condition has occurred. Due to hysteresis,
the V
1MON
input must be brought below the programmed OV
threshold by 1.5% before the comparator will be in-active,
indicating the OV condition has gone away, see Figure 6.
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