參數(shù)資料
型號(hào)： LTC692CN8#TRPBF
廠商： LINEAR TECHNOLOGY CORP
元件分類(lèi)： 電源管理
英文描述： 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDIP8
封裝： 0.300 INCH, PLASTIC, DIP-8
文件頁(yè)數(shù)： 6/20頁(yè)
文件大?。?/td> 244K
代理商： LTC692CN8#TRPBF
LTC692/LTC693
14
0692fb
APPLICATIONS INFORMATION
Example 2: The circuit in Figure 9 can be used to measure
the regulated 5V supply to provide early warning of power
failure. Because of variations in the PFI threshold, this
circuit requires adjustment to ensure the PFI comparator
trips before the reset threshold is reached. Adjust R5 such
that the PFO output goes low when the VCC supply reaches
the desired level (e.g., 4.6V).
Monitoring the Status of the Battery
C3 can also monitor the status of the memory backup
battery (Figure 10). If desired, the CE OUT can be used to
apply a test load to the battery. Since CE OUT is forced high
in battery backup mode, the test load will not be applied
to the battery while it is in use, even if the microprocessor
is not powered.
Watchdog Timer
The LTC692/LTC693 provide a watchdog timer function to
monitor the activity of the microprocessor. If the micropro-
cessor does not toggle the watchdog input (WDI) within
a selected timeout period, RESET is forced to active low
for a minimum of 140ms. The reset active time is adjust-
able on the LTC693. Since many systems cannot service
the watchdog timer immediately after a reset, the LTC693
has longer timeout period (1.0 second minimum) right
after a reset is issued. The normal timeout period (70ms
minimum) becomes effective following the rst transition
of WDI after RESET is inactive. The watchdog timeout
period is xed at a 1.0 second minimum on the LTC692.
Figure 11 shows the timing diagram of watchdog timeout
period and reset active time. The watchdog timeout period
is restarted as soon as RESET is inactive. When either a
high-to-low or low-to-high transition occurs at the WDI pin
prior to timeout, the watchdog timer is reset and begins
to timeout again. To ensure the watchdog timer does not
timeout, either a high-to-low or low-to-high transition
on the WDI pin must occur at or less than the minimum
timeout period. If the input to the WDI pin remains either
high or low, reset pulses will be issued every 1.6 seconds
typically. The watchdog timer can be deactivated by oat-
ing the WDI pin. The timer is also disabled when VCC falls
below the reset voltage threshold or VBATT.
3V
5V
692_3 F10
R1
1M
RL
20K
R2
1M
OPTIONAL TEST LOAD
LOW-BATTERY SIGNAL
TO μP I/O PIN
I/O PIN
VCC
VBATT
GND
PFI
LTC693
CE IN
PFO
CE OUT
Figure 10. Backup Battery Monitor with Optional Test Load
t1 = RESET ACTIVE TIME
t2 = NORMAL WATCHDOG TIME-OUT PERIOD
t3 = WATCHDOG TIME-OUT PERIOD IMMEDIATELY
AFTER A RESET
692_3 F11
RESET
WDO
WDI
t1
t2
t3
VCC = 5V
Figure 11. Watchdog Timeout Period and Reset Active Time
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
LTC692CS8 功能描述:IC MPU SUPERVISORY CIRCUIT 8SOIC RoHS:否 類(lèi)別:集成電路 (IC) >> PMIC - 監(jiān)控器 系列:- 標(biāo)準(zhǔn)包裝:1 系列:- 類(lèi)型:簡(jiǎn)單復(fù)位/加電復(fù)位 監(jiān)視電壓數(shù)目:1 輸出:開(kāi)路漏極或開(kāi)路集電極 復(fù)位:高有效 復(fù)位超時(shí):- 電壓 - 閥值:1.8V 工作溫度:-40°C ~ 125°C 安裝類(lèi)型:表面貼裝 封裝/外殼:6-TSOP（0.059"，1.50mm 寬）5 引線(xiàn) 供應(yīng)商設(shè)備封裝:5-TSOP 包裝:剪切帶 (CT) 其它名稱(chēng):NCP301HSN18T1GOSCT
LTC692CS8#PBF 功能描述:IC MPU SUPERVISORY CIRCUIT 8SOIC RoHS:是 類(lèi)別:集成電路 (IC) >> PMIC - 監(jiān)控器 系列:- 其它有關(guān)文件:STM6717 View All Specifications 標(biāo)準(zhǔn)包裝:1 系列:- 類(lèi)型:多壓監(jiān)控器 監(jiān)視電壓數(shù)目:2 輸出:開(kāi)路漏極或開(kāi)路集電極 復(fù)位:低有效 復(fù)位超時(shí):最小為 600 ms 電壓 - 閥值:1.11V，3.075V 工作溫度:-40°C ~ 85°C 安裝類(lèi)型:表面貼裝 封裝/外殼:SC-74A，SOT-753 供應(yīng)商設(shè)備封裝:SOT-23-5 包裝:Digi-Reel® 產(chǎn)品目錄頁(yè)面:1194 (CN2011-ZH PDF) 其它名稱(chēng):497-7019-6
LTC692CS8#TR 功能描述:IC SUPERVISORY CIRCUIT MPU 8SOIC RoHS:否 類(lèi)別:集成電路 (IC) >> PMIC - 監(jiān)控器 系列:- 標(biāo)準(zhǔn)包裝:1 系列:- 類(lèi)型:簡(jiǎn)單復(fù)位/加電復(fù)位 監(jiān)視電壓數(shù)目:1 輸出:開(kāi)路漏極或開(kāi)路集電極 復(fù)位:高有效 復(fù)位超時(shí):- 電壓 - 閥值:1.8V 工作溫度:-40°C ~ 125°C 安裝類(lèi)型:表面貼裝 封裝/外殼:6-TSOP（0.059"，1.50mm 寬）5 引線(xiàn) 供應(yīng)商設(shè)備封裝:5-TSOP 包裝:剪切帶 (CT) 其它名稱(chēng):NCP301HSN18T1GOSCT
LTC692CS8#TRPBF 功能描述:IC MPU SUPERVISORY CIRCUIT 8SOIC RoHS:是 類(lèi)別:集成電路 (IC) >> PMIC - 監(jiān)控器 系列:- 標(biāo)準(zhǔn)包裝:1 系列:- 類(lèi)型:簡(jiǎn)單復(fù)位/加電復(fù)位 監(jiān)視電壓數(shù)目:1 輸出:開(kāi)路漏極或開(kāi)路集電極 復(fù)位:高有效 復(fù)位超時(shí):- 電壓 - 閥值:1.8V 工作溫度:-40°C ~ 125°C 安裝類(lèi)型:表面貼裝 封裝/外殼:6-TSOP（0.059"，1.50mm 寬）5 引線(xiàn) 供應(yīng)商設(shè)備封裝:5-TSOP 包裝:剪切帶 (CT) 其它名稱(chēng):NCP301HSN18T1GOSCT
LTC692CS8-PBF 制造商:LINER 制造商全稱(chēng):Linear Technology 功能描述:Microprocessor Supervisory Circuits
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