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| 型号： | ADM823MYRJZ-R7 |
| 厂商： | Analog Devices Inc |
| 文件页数： | 10/12页 |
| 文件大小： | 0K |
| 描述： | IC SUPERVISOR W/RESET SOT23-5 |
| 产品培训模块： | Voltage Supervisor 101 |
| 标准包装： | 1 |
| 类型： | 简单复位/加电复位 |
| 监视电压数目： | 1 |
| 输出： | 推挽式，图腾柱 |
| 复位： | 低有效 |
| 复位超时： | 最小为 140 ms |
| 电压 - 阀值： | 4.38V |
| 工作温度： | -40°C ~ 125°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： | 剪切带 (CT) |
| 其它名称： | ADM823MYRJZ-R7CT |
ADM823/ADM824/ADM825
APPLICATIONS INFORMATION
WATCHDOG INPUT CURRENT
To minimize the watchdog input current (and minimize overall
power consumption), leave WDI low for the majority of the
watchdog timeout period. When driven high, WDI can draw as
much as 160 μA. Pulsing WDI low-high-low at a low duty cycle
reduces the effect of the large input current. When WDI is
unconnected, a window comparator disconnects the watchdog
timer from the reset output circuitry so that reset is not asserted
when the watchdog timer times out.
NEGATIVE-GOING V CC TRANSIENTS
To avoid unnecessary resets caused by fast power supply
transients, the ADM823/ADM824/ADM825 are equipped with
glitch rejection circuitry. The typical performance characteristic
in Figure 12 plots V CC transient duration vs. the transient mag-
nitude. The curves show combinations of transient magnitude
and duration for which a reset is not generated for 4.63 V and
2.93 V reset threshold parts. For example, with the 2.93 V
threshold, a transient that goes 100 mV below the threshold and
lasts 8 μs typically does not cause a reset, but if the transient is
any larger in magnitude or duration, a reset is generated. An
optional 0.1 μF bypass capacitor mounted close to V CC provides
Data Sheet
WATCHDOG SOFTWARE CONSIDERATIONS
In implementing the microprocessor watchdog strobe code,
quickly switching WDI low-to-high and then high-to-low
(minimizing WDI high time) is desirable for current consumption
reasons. However, a more effective way of using the watchdog
function can be considered.
A low-high-low WDI pulse within a given subroutine prevents
the watchdog timing out. However, if the subroutine becomes
stuck in an infinite loop, the watchdog cannot detect this cond-
ition because the subroutine continues to toggle WDI. A more
effective coding scheme for detecting this error involves using a
slightly longer watchdog timeout. In the program that calls the
subroutine, WDI is set high (see Figure 18). The subroutine sets
WDI low when it is called. If the program executes without error,
WDI is toggled high and low with every loop of the program.
If the subroutine enters an infinite loop, WDI is kept low, the
watchdog times out, and the microprocessor is reset.
START
additional glitch rejection.
ENSURING RESET VALID TO V CC = 0 V
Both active low and active high reset outputs are guaranteed to
be valid for V CC as low as 1 V. However, by using an external
resistor with push-pull configured reset outputs, valid outputs
for V CC as low as 0 V are possible. For an active low reset output,
a resistor connected between RESET and ground pulls the output
low when it is unable to sink current. For an active high reset
output, a resistor connected between RESET and V CC pulls the
SET WDI
HIGH
PROGRAM
CODE
SUBROUTINE
SET WDI
LOW
RESET
INFINITE LOOP:
WATCHDOG
TIMES OUT
output high when it is unable to source current. A large resist-
ance such as 100 k? should be used so that the reset output is
not overloaded when V CC is above 1 V.
RETURN
Figure 18. Watchdog Flow Diagram
V CC
V CC
100k?
V CC
ADM823/
ADM824/
ADM825
RESET
100k?
ADM824/
ADM825
RESET
RESET
ADM823
MR WDI
RESET
MICROPROCESSOR
I/O
Figure 17. Ensuring Reset Valid to V CC = 0 V
Rev. D | Page 10 of 12
Figure 19. Typical Application Circuit
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相关代理商/技术参数 |
参数描述 |
|---|---|
| ADM823MYRT-R7 | 制造商:AD 制造商全称:Analog Devices 功能描述:Supervisory Circuits with Watchdog and Manual Reset in 5-Lead SC70 and SOT-23 |
| ADM823RYKS-R7 | 功能描述:IC SUPERVISOR W/RESET SC70-5 RoHS:否 类别:集成电路 (IC) >> PMIC - 监控器 系列:- 标准包装:1 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:标准传输延迟为 60 µs 电压 - 阀值:3V 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:Digi-Reel® 其它名称:LM8364BALMF30DKR |
| ADM823RYRJ-R7 | 功能描述:IC SUPERVISOR W/RESET SOT23-5 RoHS:否 类别:集成电路 (IC) >> PMIC - 监控器 系列:- 标准包装:1 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:标准传输延迟为 60 µs 电压 - 阀值:3V 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:Digi-Reel® 其它名称:LM8364BALMF30DKR |
| ADM823RYRJZ-R7 | 功能描述:IC SUPERVISOR W/RESET 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:1 系列:- 类型:简单复位/加电复位 监视电压数目:1 输出:双向 复位:低有效 复位超时:最小为 140 ms 电压 - 阀值:4.63V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:TO-253-4，TO-253AA 供应商设备封装:SOT-143-4 包装:剪切带 (CT) 产品目录页面:1414 (CN2011-ZH PDF) 其它名称:MAX6314US46D3+TCT |
| ADM823RYRT-R7 | 制造商:AD 制造商全称:Analog Devices 功能描述:Supervisory Circuits with Watchdog and Manual Reset in 5-Lead SC70 and SOT-23 |
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