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參數(shù)資料
| 型號(hào)： | MIC1232 |
| 廠商： | Micrel Semiconductor,Inc. |
| 英文描述： | レP Supervisory Circuit |
| 中文描述： | レP監(jiān)控電路 |
| 文件頁(yè)數(shù)： | 6/8頁(yè) |
| 文件大?。?/td> | 162K |
| 代理商： | MIC1232 |
6
Power Monitor
The RST and RST pins are asserted whenever VCC
falls below the reset threshold voltage as determined by
the TOL pin. A 5% tolerance level (4.62V reset
threshold voltage) can be selected by connecting the
TOL pin to ground and a 10% tolerance (4.37V reset
threshold voltage) can be selected by connecting the
TOL pin to VCC. The reset pins will remain asserted for
a period of 250ms after VCChas risen above the reset
threshold voltage. The reset function ensures the
microprocessor is properly reset and powers up into a
known condition after a power failure. RST will remain
valid with VCCas low as 1.4V.
Watchdog Timer
The microprocessor can be monitored by connecting
the ST pin (watchdog input) to a bus line or I/O line. If a
high-to-low transition doesn’t occur on the ST pin within
the watchdog timeout period (determined by TD pin, see
Table 1), the RST and RST pins will be asserted
resulting in a microprocessor reset. RST and RST will
remain asserted for 250ms when this occurs. A
minimum pulse of 75ns or any transition high-to-low on
the ST pin will reset the watchdog timer. The watchdog
timer will be reset if ST sees a valid transition within the
watchdog timeout period.
Pushbutton Reset Input
The PBRST input can be driven with a manual
pushbutton switch or with external logic signals. The
input is internally debounced and requires an active low
signal to force the reset outputs into their active states.
The PBRST input will recognize any pulse that is 20ms
in duration or greater and will ignore all pulses that are
less than 1ms in duration.
Figure 1. Power-Up/Power-Down Sequence
Circuit Description
V
CC
RST
RST
t
RPU
V
CCTP
t
RPD
V
CCTP
Figure 3. Pushbutton Reset
Figure 2. Watchdog Input
RST
RST
t
RST
t
PDLY
PBRST
t
PB
t
TD
ST
t
ST
Note:
The maximum time between high-to-low transitions (t
TD
) on the
watchdog input (ST) is determined by the voltage applied to the
TD pin. If the watchdog input sees a high-to-low transition prior to
the timeout period, the watchdog timer will be reset.
MIC1232
μ
P Supervisory Circuit
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PDF描述 |
|---|---|
| MIC1232M | レP Supervisory Circuit |
| MIC1232N | レP Supervisory Circuit |
| MIC1555 | IttyBitty⑩ RC Timer / Oscillator |
| MIC1557BM5 | IttyBitty⑩ RC Timer / Oscillator |
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MIC1232_06 | 制造商:MICREL 制造商全稱:Micrel Semiconductor 功能描述:μP Supervisory Circuit |
| MIC1232M | 功能描述:IC SUPERVISOR MULTIFUNC 5V 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:低有效 復(fù)位超時(shí):標(biāo)準(zhǔn)傳輸延遲為 60 µs 電壓 - 閥值:3V 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® 其它名稱:LM8364BALMF30DKR |
| MIC1232M TR | 功能描述:IC SUPERVISOR MULTIFUNC 5V 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:低有效 復(fù)位超時(shí):標(biāo)準(zhǔn)傳輸延遲為 60 µs 電壓 - 閥值:3V 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® 其它名稱:LM8364BALMF30DKR |
| MIC1232MY | 功能描述:監(jiān)控電路 Microprocessor Supervisor with Manual Reset, Watchdog Timer, 4.37V or 4.62V Threshold Voltage, 250ms Reset Pulse, and Push-Pull Active-High and Low Outputs (DS1232) RoHS:否 制造商:STMicroelectronics 監(jiān)測(cè)電壓數(shù): 監(jiān)測(cè)電壓: 欠電壓閾值: 過(guò)電壓閾值: 輸出類(lèi)型:Active Low, Open Drain 人工復(fù)位:Resettable 監(jiān)視器:No Watchdog 電池備用開(kāi)關(guān):No Backup 上電復(fù)位延遲（典型值）:10 s 電源電壓-最大:5.5 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:UDFN-6 封裝:Reel |
| MIC1232MY TR | 功能描述:監(jiān)控電路 Microprocessor Supervisor with Manual Reset, Watchdog Timer, 4.37V or 4.62V Threshold Voltage, 250ms Reset Pulse, and Push-Pull Active-High and Low Outputs (DS1232) RoHS:否 制造商:STMicroelectronics 監(jiān)測(cè)電壓數(shù): 監(jiān)測(cè)電壓: 欠電壓閾值: 過(guò)電壓閾值: 輸出類(lèi)型:Active Low, Open Drain 人工復(fù)位:Resettable 監(jiān)視器:No Watchdog 電池備用開(kāi)關(guān):No Backup 上電復(fù)位延遲（典型值）:10 s 電源電壓-最大:5.5 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:UDFN-6 封裝:Reel |
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