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参数资料
| 型号： | TPS3813L30DBVT |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 电源管理 |
| 英文描述： | 1-CHANNEL POWER SUPPLY MANAGEMENT CKT, PDSO6 |
| 封装： | GREEN, PLASTIC, SOT-23, 6 PIN |
| 文件页数： | 2/18页 |
| 文件大小： | 536K |
| 代理商： | TPS3813L30DBVT |
WDI
WDR
WDT
GND
TPS3813
I/O
GND
Position 1
Position 2
Position 3
Position 5
Position 4
R1
R2
(1)
mC
C
(ext)
V
DD
V
DD
V
DD
0.1 F
m
0.1 F
m
V
DD
V
DD
RESET
SLVS331E – DECEMBER 2000 – REVISED OCTOBER 2010
www.ti.com
APPLICATION EXAMPLE
A typical application example (see Figure 7) is used to describe the function of the watchdog in more detail.
To configure the window watchdog function, two pins are provided by the TPS3813. These pins set the window
timeout and ratio.
The window watchdog ratio is a fixed ratio, which determines the lower boundary of the window frame. It can be
configured in two different frame sizes.
If the window watchdog ratio pin (WDR) is set to VDD, Position 1 in Figure 7, then the lower window frame is a
value based on a ratio calculation of the overall window timeout size: For the watchdog timeout pin (WDT)
connected to GND, it is a ratio of 1:124.9, for WDT connected to VDD, it is a ratio of 1:127.7, and for an external
capacitor connected to WDT, it is a ratio of 1:64.5.
If the window watchdog ratio pin (WDR) is set to GND, Position 2, the lower window frame will be a value based
on a ratio calculation of the overall window timeout size: For the watchdog timeout pin (WDT) connected to GND,
it will be a ratio of 1:31.8, for WDT connected to VDD it will be 1:32, and for an external capacitor connected to
WDT it will be 1:25.8.
The watchdog timeout can be set in two fixed timings of 0.25 seconds and 2.5 seconds for the window or can by
programmed by connecting a external capacitor with a low leakage current at WDT.
Example: If the watchdog timeout pin (WDT) is connected to VDD, the timeout will be 2.5 seconds. If the window
watchdog ratio pin (WDR) is set in this configuration to a ratio of 1:127.7 by connecting the pin to VDD, the lower
boundary is 19.6 ms.
(1)
Use this pull-down resistor if a GPIO pin is used to drive the WDI input pin of the TPS3813 to keep the WDI pin from
floating during power-up.
Figure 7. Application Example
10
Copyright 2000–2010, Texas Instruments Incorporated
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| TPS3818G25DRVR | 功能描述:监控电路 Lo Quies Crnt Acc Progr-Delay Sup Crct RoHS:否 制造商:STMicroelectronics 监测电压数: 监测电压: 欠电压阈值: 过电压阈值: 输出类型:Active Low, Open Drain 人工复位:Resettable 监视器:No Watchdog 电池备用开关:No Backup 上电复位延迟（典型值）:10 s 电源电压-最大:5.5 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:UDFN-6 封装:Reel |
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