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| 型号： | ADM6710CARJZ-REEL7 |
| 厂商： | Analog Devices Inc |
| 文件页数： | 8/12页 |
| 文件大小： | 0K |
| 描述： | IC SUPERVISOR MPU SOT23-6 |
| 产品培训模块： | Voltage Supervisor 101 |
| 标准包装： | 1 |
| 类型： | 多压监控器 |
| 监视电压数目： | 4 |
| 输出： | 开路漏极或开路集电极 |
| 复位： | 低有效 |
| 复位超时： | 最小为 140 ms |
| 电压 - 阀值： | 1.58V，2.93V，4.38V，可调 |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | SOT-23-6 |
| 供应商设备封装： | SOT-23-6 |
| 包装： | 标准包装 |
| 其它名称： | ADM6710CARJZ-REEL7DKR |
ADM6710
THEORY OF OPERATION
The ADM6710 is a compact, low power supervisory circuit
capable of monitoring up to four voltages in a multisupply
application.
The device includes several factory-set voltage threshold
options for monitoring 1.8 V, 2.5 V, 3.0 V, 3.3 V and 5.0 V
supplies. It also provides up to three adjustable thresholds for
section for a list and description of all available options.
The ADM6710Q has three adjustable voltage inputs and is
powered by V CC , which is not a monitored voltage. All other
ADM6710 devices are powered by IN 2 , which is a monitored
voltage, and therefore monitors up to four voltages. If a monitored
voltage drops below its associated threshold, the active low reset
output asserts low and remains low while either IN 1 or IN 2 remains
above 1.0 V.
ADM6710
IN 1
Adding capacitance to IN 1 , IN 3 , and IN 4 also improves noise
immunity.
Do not allow unused monitor inputs to float or to be grounded.
Connect these inputs to a supply voltage greater than their specified
threshold voltages. In the case of unused IN x adjustable inputs,
limit the bias current by connecting a 1 MΩ series resistor between
the unused input and IN 2 (or V CC in the case of the ADM6710Q).
RESET OUTPUT CONFIGURATION
The RESET output asserts low if a monitored IN x voltage drops
below its voltage threshold. Once all voltages rise above the
selected threshold level, the reset signal remains low for the
reset timeout period (200 ms typical). The reset output is open
drain with a weak internal pull-up to the monitored IN 2 or V CC
supply, typically 10 μA.
Many applications that interface with other logic devices do not
require an external pull-up resistor. However, if an external
pull-up resistor is required and it is connected to a voltage
MONITORED
SUPPLIES
IN 2
IN 3
RESET
MICROPROCESSOR
ranging from 0 V to 5.5 V, it will overdrive the internal pull-up.
Reverse current flow from the external pull-up voltage to IN 2 is
IN 4
prevented by the internal circuitry.
GND
IN 2 =3.3V
5V
Figure 12. Typical Applications Circuit
INPUT CONFIGURATION
The ADM6710 provides numerous monitor choices with
ADM6710
RESET
100k ?
V CC
RESET
adjustable reset thresholds. Typically, the threshold voltage at
each adjustable IN x input is 0.62 V. To monitor a voltage greater
than 0.62 V, connect a resistor divider network to the circuit as
depicted in Figure 13, where
Figure 14. Interface with a Different Logic Supply Voltage
= 0 . 62 V ? ? 1 2 ? ?
V INTH
? R + R ?
? R 2 ?
V INTH
R1
R2
V REF = 0.62V
ADDITION OF MANUAL RESET
Use the circuit shown in Figure 15 to add manual reset to any of
the ADM6710 adjustable inputs. When the switch is closed, the
analog input shorts to ground and a RESET output commences.
The switch must remain open for a minimum of 140 ms for the
RESET output to deassert.
ADM6710
IN 1
V IN4
Figure 13. Setting the Adjustable Monitor
The internal comparators each typically have a hysteresis of 0.3%
with respect to the reset threshold. This built-in hysteresis
improves the device’s immunity to ambient noise without
R1
R2
IN 2
IN 3
IN 4
RESET
GND
noticeably reducing the threshold accuracy. The ADM6710
is unaffected by short input transients.
The ADM6710 is powered from the monitored IN 2 , or V CC in the
case of the ADM6710Q. Monitored inputs are resistant to short
power supply glitches. Figure 7 depicts the ADM6710 glitch
immunity data. To increase noise immunity in noisy applications,
place a 0.1 μF capacitor between the IN 2 input and ground.
Rev. A | Page 8 of 12
Figure 15. Addition of Manual Reset (IN 4 is an Adjustable Input)
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