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參數(shù)資料
| 型號： | MAX16056ATA40+T |
| 廠商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分類： | 電源管理 |
| 英文描述： | 125nA Supervisory Circuits with Capacitor-Adjustable Reset and Watchdog Timeouts; Package: Land Pattern: Not Available; Temperature: -40°C to +125°C |
| 中文描述： | 1-CHANNEL POWER SUPPLY MANAGEMENT CKT, DSO8 |
| 封裝： | 3 X 3 MM, ROHS COMPLIANT, TDFN-8 |
| 文件頁數(shù)： | 16/16頁 |
| 文件大?。?/td> | 772K |
| 代理商： | MAX16056ATA40+T |
MAX16056–MAX16059
125nA Supervisory Circuits with Capacitor-
Adjustable Reset and Watchdog Timeouts
_______________________________________________________________________________________
9
Applications Information
Selecting the Reset Timeout Capacitor
The reset timeout period is adjustable to accommodate
a variety of P applications. To adjust the reset timeout
period (tRP), connect a capacitor (CSRT) between SRT
and ground. The reset timeout capacitor is calculated
as follows:
CSRT = tRP/(5.15 x 106)
with tRP in seconds and CSRT in Farads.
CSRT must be a low-leakage (< 10nA) type capacitor. A
ceramic capacitor with low temperature coefficient
dielectric (i.e., X7R) is recommended.
Selecting Watchdog Timeout Capacitor
The watchdog timeout period is adjustable to accom-
modate a variety of P applications. With this feature,
the watchdog timeout can be optimized for software
execution. The programmer can determine how often
the watchdog timer should be serviced. Adjust the
watchdog timeout period (tWD) by connecting a capaci-
tor (CSWT) between SWT and GND. For normal mode
operation, calculate the watchdog timeout as follows:
tWD = Floor[CSWT x 5.15 x 106/6.4ms] x 6.4ms + 3.2ms
with tWD in seconds and CSWT in Farads.
(Floor: take the integral value) (Figures 2 and 3)
The maximum tWD is 296s. If the capacitor sets tWD
greater than the 296s, tWD = infinite and the watchdog
timer is disabled.
CSWT must be a low-leakage (< 10nA) type capacitor.
A ceramic capacitor with low temperature coefficient
dielectric (i.e., X7R) is recommended.
Watchdog Timeout Accuracy
The watchdog timeout period is affected by the SWT
ramp current (IRAMP2) accuracy, the SWT ramp thresh-
old (VRAMP2) and the watchdog timeout clock period
(tWDPER). In the equation above, the constant 5.15 x
106 is equal to VRAMP2/IRAMP2, and 6.4ms equals the
watchdog timeout clock period. Calculate the timeout
accuracy by substituting the minimum, typical, and
maximum values into the equation.
For example, if CSWT = 100nF where tWDPER (min) =
3.2ms, tWDPER (typ) = 6.4ms, tWDPER (max) = 9.5ms.
Transient Immunity
For applications with higher slew rates on VCC during
power-up, additional bypass capacitance may be
required.
tWDMIN = Floor[100 x 10-9 x 1.173/(282 x 10-9)/9.5ms] x
3.2ms + 0.5 x 3.2ms = 141.7ms
tWDNOM = Floor[100 x 10-9 x 1.235/(240 x 10-9)/6.4ms]
+ 0.5 x 6.4ms = 515.2ms
tWDMAX = Floor[100 x 10-9 x 1.297/(197 x 10-9)/3.5ms]
x 9.5ms + 0.5 x 9.5ms = 1790.75ms
The MAX16056–MAX16059 are relatively immune to
short-duration supply voltage transients, or glitches on
VCC. The Maximum VCC Transient Duration vs. Reset
Threshold Overdrive graph in the
Typical Operating
Characteristics shows this transient immunity. The area
below the curve of the graph is the region where these
devices typically do not generate a reset pulse. This
graph was generated using a falling pulse applied to
VCC, starting 100mV above the actual reset threshold
(VTH) and ending below this threshold (reset threshold
overdrive). As the magnitude of the transient increases,
the maximum allowable pulse width decreases.
Typically, a 100mV VCC transient duration of 40s or
less does not cause a reset.
Using the MAX16056–MAX16059 for
Reducing System Power Consumption
Using the RESET output to control an external p-channel
MOSFET to control the on-time of a power supply can
result in lower system power consumption in systems that
can be regularly put to sleep. By tying the WDI input to
ground, the RESET output becomes a low-frequency
clock output. When RESET is low, the MOSFET is turned
on and power is applied to the system. When RESET is
high, the MOSFET is turned off and no power is con-
sumed by the system. This effectively reduces the shut-
down current of the system to zero (Figure 4).
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| MAX16056ATA41+T | 125nA Supervisory Circuits with Capacitor-Adjustable Reset and Watchdog Timeouts; Package: Land Pattern: Not Available; Temperature: -40°C to +125°C |
| MAX16056ATA42+T | 125nA Supervisory Circuits with Capacitor-Adjustable Reset and Watchdog Timeouts; Package: Land Pattern: Not Available; Temperature: -40°C to +125°C |
| MAX16056ATA43+T | 125nA Supervisory Circuits with Capacitor-Adjustable Reset and Watchdog Timeouts; Package: Land Pattern: Not Available; Temperature: -40°C to +125°C |
| MAX16056ATA44+T | 125nA Supervisory Circuits with Capacitor-Adjustable Reset and Watchdog Timeouts; Package: Land Pattern: Not Available; Temperature: -40°C to +125°C |
| MAX16056ATA45+T | 125nA Supervisory Circuits with Capacitor-Adjustable Reset and Watchdog Timeouts; Package: Land Pattern: Not Available; Temperature: -40°C to +125°C |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX16056ATA41+T | 功能描述:監(jiān)控電路 NanoPwr w/Cap-Adj Reset and Watchdog RoHS:否 制造商:STMicroelectronics 監(jiān)測電壓數(shù): 監(jiān)測電壓: 欠電壓閾值: 過電壓閾值: 輸出類型:Active Low, Open Drain 人工復位:Resettable 監(jiān)視器:No Watchdog 電池備用開關(guān):No Backup 上電復位延遲（典型值）:10 s 電源電壓-最大:5.5 V 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:UDFN-6 封裝:Reel |
| MAX16056ATA42+T | 功能描述:監(jiān)控電路 NanoPwr w/Cap-Adj Reset and Watchdog RoHS:否 制造商:STMicroelectronics 監(jiān)測電壓數(shù): 監(jiān)測電壓: 欠電壓閾值: 過電壓閾值: 輸出類型:Active Low, Open Drain 人工復位:Resettable 監(jiān)視器:No Watchdog 電池備用開關(guān):No Backup 上電復位延遲（典型值）:10 s 電源電壓-最大:5.5 V 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:UDFN-6 封裝:Reel |
| MAX16056ATA43+ | 制造商:Maxim Integrated Products 功能描述:- Rail/Tube |
| MAX16056ATA43+T | 功能描述:監(jiān)控電路 NanoPwr w/Cap-Adj Reset and Watchdog RoHS:否 制造商:STMicroelectronics 監(jiān)測電壓數(shù): 監(jiān)測電壓: 欠電壓閾值: 過電壓閾值: 輸出類型:Active Low, Open Drain 人工復位:Resettable 監(jiān)視器:No Watchdog 電池備用開關(guān):No Backup 上電復位延遲（典型值）:10 s 電源電壓-最大:5.5 V 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:UDFN-6 封裝:Reel |
| MAX16056ATA44+T | 功能描述:監(jiān)控電路 NanoPwr w/Cap-Adj Reset and Watchdog RoHS:否 制造商:STMicroelectronics 監(jiān)測電壓數(shù): 監(jiān)測電壓: 欠電壓閾值: 過電壓閾值: 輸出類型:Active Low, Open Drain 人工復位:Resettable 監(jiān)視器:No Watchdog 電池備用開關(guān):No Backup 上電復位延遲（典型值）:10 s 電源電壓-最大:5.5 V 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:UDFN-6 封裝:Reel |
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