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参数资料
| 型号： | ISL88012EVAL1Z |
| 厂商： | Intersil |
| 文件页数： | 9/14页 |
| 文件大小： | 0K |
| 描述： | EVALUATION BOARD FOR ISL88012 |
| 产品培训模块： | Solutions for Industrial Control Applications |
| 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 |
| 嵌入式： | 否 |
| 已用 IC / 零件： | ISL88012 |
| 已供物品： | 板 |
ISL88011, ISL88012, ISL88013, ISL88014, ISL88015
Principles of Operation
The ISL88011, ISL88012, ISL88013, ISL88014, ISL88015
devices provide those functions needed for critical voltage
monitoring. These features include Power-On Reset control,
customizable supply voltage supervision, Watchdog Timer
capability, and manual reset assertion. By integrating all of
these features into a small 5 Ld SOT-23 package and using
only 5.5μA of supply current, the ISL88011, ISL88012,
ISL88013, ISL88014, ISL88015 devices can assist in
lowering system cost, reducing board space requirements,
and increasing the reliability of a system.
Low Voltage Monitoring
During normal operation, these supervisors monitor both the
voltage level of V DD (ISL88011, ISL88012, ISL88013) and/or
VMON (ISL88012, ISL88014, ISL88015). The device asserts
a reset if any of these voltages falls below their respective
trip points. The reset signal effectively prevents the system
from operating during a power failure or brownout condition.
This reset signal remains asserted until V DD and the voltage
on VMON exceed their voltage threshold setting for the reset
time delay period t POR of 200ms (See Figure 1)
The ISL88012, ISL88014 and ISL88015 allow users to
customize the minimum voltage sense level on the VMON
input pin. To do this, connect an external resistor divider
network to the VMON pin in order to set the trip point to
some voltage above 600mV according to the following
Equation 1 (See Figure 2).
:
Power-On Reset (POR)
Applying at least 1V to the V DD pin activates a P OR circuit
which asserts reset (i.e., RST goes HIGH while RST goes
LOW). The reset signals remain asserted until the voltage at
V DD and/or VMON rise above the minimum voltage sense
level for time period t POR . This ensures that the voltages
have stabilized.
These reset signals provide several benefits:
? It prevents the system microprocessor from starting to
operate with insufficient voltage.
? It prevents the processor from operating prior to
stabilization of the oscillator.
? It ensures that the monitored device is held out of
operation until internal registers are properly loaded.
? It allows time for an FPGA to download its configuration
prior to initialization of the circuit.
Adjusting POR Timeout via C POR Pin
On the ISL88011 and ISL88014, users can adjust the
Power-On Reset timeout delay (t POR ) up to many times the
normal t POR of 250ms. To do this, connect a capacitor
between C POR and ground (see Figure 3). For example,
connecting a 30pF capacitor to C POR will increase t POR
from a typical 250ms to about 2.5s. NOTE: Care should be
taken in PCB layout and capacitor placement in order to
reduce stray capacitance as much as possible, which
lengthens the t POR timeout period.
( R 1 + R 2 )
V INTRIP = 0.6 × --------------------------
R 2
(EQ. 1)
C POR
ISL88011
ISL88014
V IN
R 1
VMON
R 2
ISL88012
ISL88014
ISL88015
6
5
4
FIGURE 2. USING VMON TO MONITOR V IN VIA RESISTORS
3
2
1
0
0
10
20
30
40
50
60
70
80
C POR (pF)
FIGURE 3. ADJUSTING t POR WITH A CAPACITOR
9
FN8093.4
June 13, 2013
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相关代理商/技术参数 |
参数描述 |
|---|---|
| ISL88012IH522Z | 制造商:Intersil Corporation 功能描述:IC SM TIMER VOLTAGE MONITORING 5LD |
| ISL88012IH522Z-T7A | 功能描述:IC VOLTAGE MONITOR DUAL SOT23-5 RoHS:是 类别:集成电路 (IC) >> PMIC - 监控器 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:2,500 系列:- 类型:简单复位/加电复位 监视电压数目:1 输出:开路漏极或开路集电极 复位:低有效 复位超时:最小为 600 ms 电压 - 阀值:3.8V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:SC-74A，SOT-753 供应商设备封装:SOT-23-5 包装:带卷 (TR) |
| ISL88012IH522Z-TK | 功能描述:IC VOLTAGE MONITOR DUAL SOT23-5 RoHS:是 类别:集成电路 (IC) >> PMIC - 监控器 系列:- 标准包装:50 系列:- 类型:简单复位/加电复位 监视电压数目:1 输出:开路漏极或开路集电极 复位:低有效 复位超时:最小为 130 ms 电压 - 阀值:4.25V 工作温度:-40°C ~ 85°C 安装类型:通孔 封装/外壳:8-DIP（0.300"，7.62mm） 供应商设备封装:8-PDIP 包装:管件 |
| ISL88012IH523Z | 制造商:Rochester Electronics LLC 功能描述: 制造商:Intersil Corporation 功能描述: |
| ISL88012IH523Z-T7A | 功能描述:IC VOLTAGE MONITOR DUAL SOT23-5 RoHS:是 类别:集成电路 (IC) >> PMIC - 监控器 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:2,500 系列:- 类型:简单复位/加电复位 监视电压数目:1 输出:开路漏极或开路集电极 复位:低有效 复位超时:最小为 600 ms 电压 - 阀值:3.8V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:SC-74A，SOT-753 供应商设备封装:SOT-23-5 包装:带卷 (TR) |
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