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参数资料
| 型号： | EVAL-AD5100EBZ |
| 厂商： | Analog Devices Inc |
| 文件页数： | 16/36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
V 4MON
V 4MON is a low voltage monitoring input that controls the RESET
function of an external device or provides a comparator output,
V 4OUT . The V 4MON pin is monitored by a comparator to detect an
undervoltage condition. It is designed with 5% hysteresis.
When the V 4MON input drops below the programmed UV thresh-
old, the comparator becomes active immediately, indicating that
a UV condition has occurred. Due to hysteresis, the V 4MON input
must be brought above the programmed UV threshold by 5%
before the comparator becomes inactive, indicating that the UV
condition has gone away (see Figure 11).
V 4MON
The V 4MON , RESET, and V 4OUT timing diagrams are shown in
The default monitoring threshold is 7.54 V. Similarly, the range
of reset hold time is shown in Table 8 , and the programming
V 4MON exhibits typical input resistance of 675 kΩ that users
should take into account for loading effect.
WATCHDOG INPUT
The watchdog input (WDI) circuit attempts to reset the system
to a known good state if a software or hardware glitch renders
the system processor inactive for a duration that is longer than
the timeout period. The timeout period, t WD , is programmable
V 4MON_UV
UV
COMPARATOR
INACTIVE
UV
COMPARATOR
INACTIVE
HYSTERESIS
in eight steps from 100 ms to 2000 ms. The watchdog circuit is
independent of any CPU clock that the watchdog is monitoring.
The range of watchdog timeout is shown in Table 8, and the
The default timeout is 1500 ms.
Figure 11. V 4MON Hysteresis
The V 4MON comparator is used to control the V 4OUT pin and (in
conjunction with a hold timer) to control the RESET pin. To
configure V 4MON to control the RESET pin, set Register 0x0D[3]
to 0. Setting this bit to 1 prevents V 4MON from causing RESET to
activate. The default setting is V 4MON does not cause RESET to
activate.
V 4MON input voltage range is up to 30 V. It has an 8-step
programmable reset threshold (Register 0x06) from 1.67 V
to 7.96 V, with an 8-step 0.1 ms to 200 ms reset hold time
(t RS_HOLD ).
t GLITCH
V 4MON
V 4MON
The watchdog is disabled during power-up. WDI starts monitor-
ing once RESET is high. The AD5100 provides a standard or
advanced watchdog monitoring function. Register 0x0F[3] sets
the watchdog function to either standard or advanced mode.
This bit can be fixed in OTP memory.
? Register 0x0F[3] = 0: standard watchdog mode (Default)
? Register 0x0F[3] = 1: advanced watchdog mode
t RS_HOLD*
t RS_DELAY
t RS_HOLD*
t RS_DELAY
RESET
V 4OUT
NOTES
1. * = PROGRAMMABLE.
2. MOST APPLICATIONS USING V 4OUT REQUIRE DISABLING OF V 4MON TRIGGERED RESET.
Figure 12. V 4MON , RESET, and V 4OUT Timing Diagrams
Rev. A | Page 16 of 36
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