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参数资料
| 型号： | EVAL-AD5100EBZ |
| 厂商： | Analog Devices Inc |
| 文件页数： | 15/36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
The ranges of on and off thresholds are shown in Table 6 and
V 3MON
the programming codes for the selected-thresholds are found in
6.95 V. Similarly, the ranges of shutdown hold and delay times
are shown in Table 8, and the programming codes of the selected
timings are found in Table 9. The default shutdown hold time is
10 ms and the delay time is 100 ms.
V 3MON_UV
UV
COMPARATOR
INACTIVE
UV
COMPARATOR
INACTIVE
HYSTERESIS
V 2MON_OFF is ignored if V 2MON_OFF is greater than V 2MON_ON but
V 2MON_OFF cannot equal V 2MON_ON.
If V 2MON is selected with rising edge triggered wake-up mode,
only the on threshold is monitored and the off threshold
is ignored. V 2MON is put into rising edge triggered mode by
setting V 2MON off threshold, Register 0x04[3:0] to 1001
The voltage at V 1MON provides the power for the AD5100, but a
valid signal on V 2MON must be present before the internal V REG
starts operating. Details are explained in the Power Requirements
section.
V 2MON exhibits typical input resistance of 675 kΩ that users
should take into account for loading effect.
V 3MON
V 3MON i s a low voltage monitoring input that controls the
RESET function of an external device.
The V 3MON pin is monitored by a comparator to detect an
undervoltage condition. It is designed with 1.5% hysteresis.
When the V 3MON input drops below the programmed UV
threshold, the comparator becomes active immediately, indi-
cating that a UV condition has occurred. Due to hysteresis,
the V 3MON 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 (see Figure 9).
t GLITCH
V 3MON
V 3MON
Figure 9. V 3MON Hysteresis
The V 3MON comparator is used (in conjunction with a hold
timer) to control the RESET pin.
V 3MON monitors inputs from 2.0 V to 5.5 V. It has an 8-step
programmable reset threshold (Register 0x05) with an 8-step
0.1 ms to 200 ms reset hold time (t RS_HOLD ). The reset hold time
means that the RESET output remains activate when V 3MON goes
above its UV threshold, until t RS_HOLD has elapsed. This allows
the reset of an external device to be held until the programmed
time is reached.
The range of thresholds is shown in Table 6 and the programming
code for the selected threshold is found in Table 7 . The range of
reset hold times is shown in Table 8 and the programming code
V 3MON exhibits typical input resistance of 130 kΩ that users
should take into account for loading effect.
The MR input has an internal resistor pull-up toV 3MON . The
RESET output is push-pull, between V 3MON and GND.
t RS_HOLD*
t RS_DELAY
t RS_HOLD*
t RS_DELAY
RESET
NOTES
1. * = PROGRAMMABLE
Figure 10. V 3MON , RESET Timing Diagrams
Rev. A | Page 15 of 36
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