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参数资料
| 型号： | ADM6320CZ29ARJ-RL7 |
| 厂商： | Analog Devices Inc |
| 文件页数： | 10/16页 |
| 文件大小： | 0K |
| 描述： | IC SUPERVISOR WATCHDOG SOT23-5 |
| 标准包装： | 1 |
| 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 140 ms |
| 电压 - 阀值： | 2.93V |
| 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： | 标准包装 |
| 其它名称： | ADM6320CZ29ARJ-RL7DKR |
ADM6316/ADM6317/ADM6318/ADM6319/ADM6320/ADM6321/ADM6322
APPLICATIONS INFORMATION
Data Sheet
WATCHDOG INPUT CURRENT
To minimize 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-to-high-to-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 ADM6316/ADM6317/ADM6318/ADM6319/ADM6320/
ADM6321/ADM6322 are equipped with glitch rejection circuitry.
The typical performance characteristic in Figure 14 plots V CC
transient duration vs. the transient magnitude. 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
WATCHDOG SOFTWARE CONSIDERATIONS
In implementing the microprocessor’s watchdog strobe code,
quickly switching WDI low to high and then high to low (mini-
mizing WDI high time) is desirable for current consumption
reasons. However, a more effective way of using the watchdog
function can be considered.
A low-to-high-to-low WDI pulse within a given subroutine
prevents the watchdog from timing out. However, if the sub-
routine becomes stuck in an infinite loop, the watchdog cannot
detect this 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. 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
START
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 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
SET WDI
HIGH
PROGRAM
CODE
SUBROUTINE
SET WDI
LOW
RESET
INFINITE LOOP:
WATCHDOG
TIMES OUT
low when it is unable to sink current. For the active-high case, a
resistor connected between RESET and V CC pulls the output high
when it is unable to source current. A large resistance, such as
100 k?, should be used so that it does not overload the reset
output when V CC is above 1 V.
RETURN
Figure 20. Watchdog Flow Diagram
V CC
V CC
V CC
RESET
RESET
ADM6316/
ADM6318/
ADM6319
RESET
100k ?
ADM6317/
ADM6318/
ADM6319/
ADM6321/
ADM6322
100 k?
RESET
ADM6316 MICROPROCESSOR
MR WDI I/O
Figure 21. Typical Application Circuit
Figure 19. Ensuring Reset Valid to V CC = 0 V
Rev. F | Page 10 of 16
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相关代理商/技术参数 |
参数描述 |
|---|---|
| ADM6320CZ29-ARJZ-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 SOT-23 |
| ADM6320CZ29ARJZ-R7 | 功能描述:IC SUPERVISOR WATCHDOG SOT23-5 RoHS:是 类别:集成电路 (IC) >> PMIC - 监控器 系列:- 标准包装:100 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，开路漏极 复位:高有效/低有效 复位超时:最小为 250 ms 电压 - 阀值:4.37V，4.62V 工作温度:0°C ~ 70°C 安装类型:表面贴装 封装/外壳:8-SOIC（0.154"，3.90mm 宽） 供应商设备封装:8-SOIC 包装:管件 产品目录页面:1337 (CN2011-ZH PDF) |
| ADM6320xxxARJ-RL7 | 制造商:AD 制造商全称:Analog Devices 功能描述:Supervisory Circuits with Watchdog |
| ADM6320xxxARJZ-R7 | 制造商:AD 制造商全称:Analog Devices 功能描述:Supervisory Circuits with Watchdog |
| ADM6321 | 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 SOT-23 |
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