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AD5100 Fiches technique(PDF) 11 Page - Analog Devices

No de pièce AD5100
Description  System-Management IC with Programmable Quad Voltage Monitoring and Supervisory Functions
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Fabricant  AD [Analog Devices]
Site Internet  http://www.analog.com
Logo AD - Analog Devices

AD5100 Fiches technique(HTML) 11 Page - Analog Devices

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Preliminary Technical Data
AD5100
Rev. PrJ | Page 11 of 32
MR
0 – 5 V
Highest Prority on
Leave Floating
Other Inputs
Monitoring Inputs
V1MON
V1MON 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.
V1MON 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 V1MON, 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 V1MON provides the power for the AD5100 but
valid signal at V2MON must be present before the internal VREG
starts operation. Details will be explained in the power
section.
* = Programmable
V2MON
V
2MON_ON *
t
GLITCH
t
2SD_DELAY *
V
2MON_OFF *
t
2SD_HOLD *
t
2SD_HOLD *
t
1SD_DELAY *
t
1SD_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 tVREG_Off_Delay or else the AD5100 will be powered off
* = Programmable
V2MON
V
2MON_ON *
t
GLITCH
t
2SD_DELAY *
V
2MON_OFF *
t
2SD_HOLD *
t
2SD_HOLD *
t
1SD_DELAY *
t
1SD_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 tVREG_Off_Delay or else the AD5100 will be powered off
Figure 5. V1MON and V2MON Shutdown Timing Diagrams (Note
RESET follows SHDN ).
The V1MON 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 V1MON n input goes above the programmed OV
threshold, the comparator will become active immediately,
indicating an OV condition has occurred. Due to hysteresis,
the V1MON 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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