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| 型号： | EVAL-AD5100EBZ |
| 厂商： | Analog Devices Inc |
| 文件页数： | 13/36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
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 provides a shutdown warning to the system. V 1MON monitors
inputs from 6 V to 30 V.
The V 1MON pin is monitored by two comparators, one for overvol-
tage and one for undervoltage detection. Both are designed with
1.5% hysteresis.
When the V 1MON input goes above the programmed overvoltage
(OV) threshold, the comparator becomes active immediately,
indicating that 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 becomes inactive,
indicating that the OV condition has gone away (see Figure 6).
V 1MON_OV
shutdown delay (t 1SD_DELAY ). The shutdown hold time means that
the SHDN signal is held low for t 1SD_HOLD after V 1MON returns
within its UV and OV thresholds. The shutdown delay means
that the SHDN signal activation is delayed until the programmed
t 1SD_DELAY has elapsed. SHDN activates once the voltage on V 1MON
is outside the OV or UV threshold for a time longer than t GLITCH .
RESET follows SHDN delay and hold timings when triggered
by V IMON .
The OV threshold chosen must be greater than the UV threshold.
When the shutdown is triggered, either because the input has
reached the OV or UV threshold, such fault conditions are
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 1SD_DELAY ) is set relative to the SHDNWARN propagation
V 1MON
V 1MON_UV
OV
COMPARATOR
ACTIVE
HYSTERESIS
OV
COMPARATOR
INACTIVE
HYSTERESIS
delay (t FD_DELAY ). This feature attempts to allow the system to
finish any critical housekeeping tasks before shutting down the
external device.
The V 1MON , shutdown, and shutdown warning timing diagrams
UV
UV
The ranges of OV and UV thresholds are shown in Table 6, and
COMPARATOR COMPARATOR
ACTIVE INACTIVE
Figure 6. V 1MON Hysteresis
When the V 1MON input drops below the programmed under-
voltage (UV) threshold, the comparator becomes active
immediately, indicating that 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 becomes inactive, indicating that the UV condition
has gone away.
Both V 1MON comparators are used (in conjunction with hold and
delay timers) to control the SHDN and RESET pins.
the programming codes for the selected thresholds are found in
threshold, it is 8.43 V. Similarly, the ranges of shutdown hold
and delay times are shown in Table 8, and the programming
V 1MON exhibits typical input resistance of 55 kΩ that users
should take into account for loading effect.
The voltage at V 1MON provides the power for the AD5100, but
a valid signal on V 2MON must be present before the internal
power rail, V REG , starts operation. Details are explained in the
Power Requirements section.
V 1MON has a 16-level programmable OV threshold (Register 0x01)
and UV threshold (Register 0x02) with an 8-step 0.07 ms to
200 ms shutdown hold time (t 1SD_HOLD ) and 0.07 ms to 1200 ms
Rev. A | Page 13 of 36
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