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| 型号： | EVAL-AD5100EBZ |
| 厂商： | Analog Devices Inc |
| 文件页数： | 14/36页 |
| 文件大小： | 0K |
| 描述： | BOARD EVAL FOR AD5100 |
| 标准包装： | 1 |
| 主要目的： | 电源管理，电源监控器/跟踪器/序列发生器 |
| 已用 IC / 零件： | AD5100 |
| 主要属性： | 电压检测器和监控器 |
| 次要属性： | 开漏极输出 |
| 已供物品： | 板 |
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AD5100
t GLITCH
V 1MON_OV*
V 1MON
V 1MON_UV*
t GLITCH
V 2MON_ON*
V 2MON
t MIN #
V 2MON_OFF*
t 1SD_DELAY*
t 1SD_DELAY*
t 2SD_HOLD*
t 2SD_DELAY*
t 2SD_HOLD*
t 1SD_HOLD*
t 1SD_HOLD*
t 2SD_DELAY*
SHDN
AND RESET
t FD_DELAY
t FD_DELAY
t FD_DELAY
t FD_DELAY
SHDNWARN
NOTES
1. * = PROGRAMMABLE.
2. # = THE DURATION OF THE t MIN MUST BE SHORTER THAN t VREG_OFF_DELAY OR ELSE THE AD5100 WILL BE POWERED OFF.
Figure 7. V 1MON and V 2MON Shutdown Timing Diagrams in Level-Sensitive Mode (Note that RESET Follows SHDN)
V 2MON
V 2MON_ON
V 2MON is a high voltage monitoring input that controls the SHDN
and RESET functions of the external devices. V 2MON monitors
inputs from 3 V to 30 V. It has a 16-level programmable turn-on
and turn-off (on, off) hysteresis thresholds (Register 0x03 and
Register 0x04), with an 8-step 0.07 ms to 200 ms shutdown hold
time (t 2SD_HOLD ) and 0.07 ms to 1200 ms shutdown delay
V 2MON
V 2MON_OFF
ON
COMPARATOR
ACTIVE
HYSTERESIS
ON
COMPARATOR
INACTIVE
HYSTERESIS
(t 2SD_DELAY ).
OFF
OFF
COMPARATOR COMPARATOR
The V 2MON pin is monitored by two comparators, one for turn-
ACTIVE
INACTIVE
on and one for turn-off detection, in the level-sensitive power-
up mode. Both are designed with 1.5% hysteresis. Only the
turn-on monitoring comparator is used if the rising edge
triggered wake-up mode is selected.
When the V 2MON input goes above the programmed V 2MON on
threshold, the comparator becomes active immediately, indicat-
ing that an on condition has occurred. Due to hysteresis, the
V 2MON input must be brought below the programmed threshold
by 1.5% before the comparator becomes inactive, indicating that
the on condition has gone away (see Figure 8).
When the V 2MON input drops below the programmed threshold,
the comparator becomes active immediately, indicating that a
V 2MON off condition has occurred. Similarly, due to hysteresis,
the V 2MON input must be brought above the programmed threshold
by 1.5% before the comparator becomes inactive, indicating that
the off condition has gone away.
Figure 8. V 2MON Hysteresis
By default, V 2MON is level sensitive and the on and off thresholds
are both monitored. The on threshold chosen must be greater
than the off threshold.
When the SHDN output is activated by the input reaching
the V 2MON_OFF threshold, such fault condition is temporarily
recorded in the fault detection register. The SHDNWARN
output transitions low for signaling before the shutdown output,
SHDN, activates. The timing of the SHDN output is dependent
on how long the shutdown programmed delay (t 2SD_DELAY ) is set
relative to the SHDNWARN propagation delay (t FD_DELAY ). This
feature allows the system to finish any critical housekeeping
tasks before shutting down the external device. SHDN activates
once the voltage on V 2MON is outside the threshold for a time longer
than t GLITCH . RESET follows SHDN delay and hold timings when
triggered by V 2MON .
The V 2MON , shutdown, and shutdown warning timing diagrams
Rev. A | Page 14 of 36
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