參數(shù)資料
型號(hào)： MB3793-27APFV
廠商： FUJITSU LTD
元件分類： 電源管理
英文描述： Power Voltage Monitoring IC with Watchdog Timer
中文描述： 1-CHANNEL POWER SUPPLY MANAGEMENT CKT, PDSO8
封裝： PLASTIC, SSOP-8
文件頁(yè)數(shù)： 12/23頁(yè)
文件大?。?/td> 173K
代理商： MB3793-27APFV
12
MB3793
-27A
The V
th
value is about 2.4 V with V
CC
= 3.3 V
The power-on reset hold timer monitor time t
PR
is set with the following equation:
t
PR
(ms) ..
×
C
TP
(
μ
F)
The value of A is about 750 with V
CC
= 3.3 V and about 700 with V
CC
= 3.0 V. The MB3793 also starts
charging the watchdog timer monitor time setting capacitor (C
TW
).
(4) When the voltage at the watchdog timer monitor time setting pin C
TW
reaches the “H” level threshold voltage
V
H
, the C
TW
switches from the charge state to the discharge state.
The value of V
H
is always about 1.24 V regardless of the detected voltage.
(5) If the CK2 pin inputs a clock pulse (positive edge trigger) when the C
TW
is being discharged in the CK1-CK2
order or simultaneously, the C
TW
switches from the discharge state to the charge state.
The MB3793 repeats operations (4) and (5) as long as the CK1/CK2 pin inputs clock pulses with the system
logic circuit operating normally.
(6) If no clock pulse is fed to the CK1 or CK2 pin within the watchdog timer monitor time t
WD
due to some problem
with the system logic circuit, the CTW pin is set to the “L” level threshold voltage V
L
or less and the MB3793
outputs a reset signal (setting the RESET pin to “L” level from “H” level).
The value of V
L
is always about 0.24 V regardless of the detected voltage.
The watchdog timer monitor time t
WD
is set with the following equation:
t
WD
(ms) ..
×
C
TW
(
μ
F)
The value of B is hardly affected by the power supply voltage; it is about 1600 with V
CC
= 3.0 to 3.3 V.
(7) When a certain period of time t
WR
has passed (until the CTP pin voltage reaches or exceeds Vth again after
recharging the C
TP
), the MB3793 cancels the reset signal and starts operating the watchdog timer.
The watchdog timer monitor reset time t
WR
is set with the following equation:
t
WR
(ms) ..
TP
(
μ
F)
The value of D is 55 with V
CC
= 3.3 V and about 50 with V
CC
= 3.0 V.
The MB3793 repeats operations (4) and (5) as long as the CK1/CK2 pin inputs clock pulses. If no clock
pulse is input, the MB3793 repeats operations (6) and (7).
(8) If V
CC
is lowered to the fall-time detected voltage (V
SL
) or less, the CTP pin voltage decreases and the
MB3793 outputs a reset signal (setting the RESET pin to “L” level from “H” level).
The value of V
SL
is 2.7 V
(9) When V
CC
reaches or exceeds V
SH
again, the MB3793 starts charging the C
TP
.
(10) When the CTP pin voltage reaches or exceeds V
th
, the MB3793 cancels the reset and restarts operating
the watchdog timer. It repeats operations (4) and (5) as long as the CK1/CK2 pin inputs clock pulses.
(11) Making the inhibit pin active (setting the INH pin to “H” from “L”) forces the watchdog timer to stop operation.
This stops only the watchdog timer, leaving the MB3793 monitoring V
CC
(operations (8) to (10)).
The watchdog timer remains inactive unless the inhibit input is canceled.
(12) Canceling the inhibit input (setting the INH pin to “L” from “H”) restarts the watchdog timer.
(13) The reset signal is output when the power supply is turned off to set V
CC
to V
SL
or less.
相關(guān)PDF資料
PDF描述
MB3793-30 Power Supply Monitor with Watch-Dog Timer(帶看門狗定時(shí)器的電源監(jiān)視器)
MB3793-42 Power Supply Monitor with Watch-Dog Timer(帶看門狗定時(shí)器的電源監(jiān)視器)
MB3793-37A Power Voltage Monitoring IC with Watchdog Timer
MB3793-37PF Power Voltage Monitoring IC with Watchdog Timer
MB3793-37PNF Power Voltage Monitoring IC with Watchdog Timer
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
MB3793-27APFV-G-JN-6E1 功能描述:IC PWR VOLT MON 27A WD 8SSOP RoHS:是 類別: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:497-7019-6
MB3793-27APNF 制造商:FUJITSU Component Ltd 功能描述:MB3793-27APNF
MB3793-27APNF-G-JN-6E1 制造商:Fujitsu 功能描述:3.5V to 16V 2.7V VvZbg/p[IZbg 8SOP Tube
MB3793-27APNF-G-JN-ER6E1 功能描述:IC PWR VOLT MON 27A WD 8SOP RoHS:是 類別:集成電路 (IC) >> PMIC - 監(jiān)控器 系列:- 標(biāo)準(zhǔn)包裝:3,000 系列:- 類型:簡(jiǎn)單復(fù)位/加電復(fù)位 監(jiān)視電壓數(shù)目:1 輸出:推挽式，圖騰柱 復(fù)位:高有效 復(fù)位超時(shí):最小為 100 ms 電壓 - 閥值:3.06V 工作溫度:-40°C ~ 105°C 安裝類型:表面貼裝 封裝/外殼:SC-70，SOT-323 供應(yīng)商設(shè)備封裝:SC-70-3 包裝:帶卷 (TR) 其它名稱:ADM1817-5AKSREEL7
MB3793-27DPNF-G-JN-ERE1 功能描述:Supervisor Open Drain or Open Collector 1 Channel 8-SOP 制造商:cypress semiconductor corp 系列:- 包裝:剪切帶（CT） 零件狀態(tài):有效 類型:簡(jiǎn)單復(fù)位/加電復(fù)位 受監(jiān)控電壓數(shù):1 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 30 ms 電壓 - 閾值:2.7V 工作溫度:-40°C ~ 85°C（TA） 安裝類型:表面貼裝 封裝/外殼:8-SOIC（0.154"，3.90mm 寬） 供應(yīng)商器件封裝:8-SOP 標(biāo)準(zhǔn)包裝:1
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