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| 型号： | MAX6791TPWD2+ |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 18/24页 |
| 文件大小： | 0K |
| 描述： | IC REG LIN W/SPR VSR 20-TQFN |
| 其它有关文件： | Automotive Product Guide |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 60 |
| 类型： | 稳压器/监控器 |
| 监视电压数目： | 2 |
| 输出： | 开路漏极或开路集电极 |
| 复位： | 低有效 |
| 复位超时： | 最小为 8.75 ms |
| 电压 - 阀值： | 1.665V，可调 |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 20-WQFN 裸露焊盘 |
| 供应商设备封装： | 20-TQFN-EP（5x5） |
| 包装： | 管件 |
High-Voltage, Micropower, Single/Dual Linear
Regulators with Supervisory Functions
Selecting Watchdog Timeout Period
The watchdog timeout period is adjustable to accommo-
date a variety of μP applications. With this feature, the
watchdog timeout can be optimized for software execu-
tion. The programmer can determine how often the
watchdog timer should be serviced. Adjust the watch-
dog timeout period (t WD ) by connecting a capacitor
between CSWT and GND. For normal-mode operation,
calculate the watchdog timeout capacitor as follows:
The fast watchdog period, t WD1 , is selectable as a ratio
from the slow watchdog fault period (t WD2 ). Select the
fast watchdog period by connecting WDS0 and WDS1 to
OUT/OUT1 or GND according to Table 4, which illus-
trates the settings for the 8, 16, and 64 window ratios
(t WD2 /t WD1 ). For example, if C CSWT is 2000pF, and
WDS0 and WDS1 are low, then t WD2 is 318ms (typ) and
t WD1 is 40ms (typ). RESET asserts if the watchdog input
has two edges too close to each other (faster than t WD1 );
t WD 2 = C CSWT ? 155 × 10 6
?
?
?
V ?
A ?
or has edges that are too far apart (slower than t WD2 ).
All WDI inputs are ignored while RESET is asserted. The
watchdog timer begins to count after RESET is
t WD 2 = C CSWT ? 155 × 10 6
?
where t WD is in seconds and C CSWT is in Farads.
To select the internally fixed watchdog timeout period
for the MAX6791–MAX6794, connect CSWT to OUT1.
To select the internally fixed watchdog timeout period
for the MAX6795/MAX6796, connect CSWT to OUT.
C CSWT must be a low-leakage (< 10nA) type capacitor.
Ceramic capacitors are recommended; do not use
capacitors lower than 100pF to avoid the influence of
parasitic capacitances.
The MAX6791/MAX6792 have a windowed watchdog
timer that asserts RESET for t RP when the watchdog
recognizes a fast watchdog fault (time between transi-
tions < t WD1 ), or a slow watchdog fault (time between
transitions > t WD2 ). The reset timeout period is adjust-
ed independently of the watchdog timeout period. The
slow watchdog period, t WD2 , is calculated as follows:
? V ?
? A ?
where t WD2 is in seconds and C CSWT is in Farads.
deasserted. If the time difference between two transi-
tions on WDI is shorter than t WD1 or longer than t WD2 ,
RESET is forced to assert low for the reset timeout peri-
od. If the time difference between two transitions on WDI
is between t WD1 (min) and t WD1 (max) or t WD2 (min)
and t WD2 (max), RESET is not guaranteed to assert or
deassert; see Figure 3. To guarantee that the window
watchdog does not assert RESET , strobe WDI between
t WD1 (max) and t WD2 (min). The watchdog timer is
cleared when RESET is asserted. Disable the watchdog
timer by connecting WDS0 high and WDS1 low.
There are several options available to disable the
watchdog timer (for system development or test pur-
poses or when the μP is in a low-power sleep mode).
One way to disable the watchdog timer is to drive
WD-DIS low for the MAX6793 –MAX6796 and drive
WDS0 high and WDS1 low for the MAX6791/MAX6792.
This prevents the capacitor from ramping up. Finally,
reducing the OUT/OUT1 regulator current below the
specified regulator current watchdog-disable threshold
(3mA min) also disables the watchdog timer. The
t WD0
MIN
t WD1
MAX
MIN
t WD2
MAX
RESET:
GUARANTEED
TO ASSERT
UNDETERMINED
GUARANTEED
TO NOT ASSERT
UNDETERMINED
GUARANTEED
TO ASSERT
WDI INPUT:
FAST
FAULT
NORMAL
OPERATION
SLOW
FAULT
Figure 3. Windowed Watchdog Timing Diagram
18
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX6791TPWD2+ | 功能描述:线性稳压器 - 标准 Dual uPower Linear RoHS:否 制造商:STMicroelectronics 输出类型: 极性: 输出电压:1.8 V 输出电流:150 mA 负载调节: 最大输入电压:5.5 V 线路调整率: 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:SOT-323-5L |
| MAX6791TPWD2+T | 功能描述:线性稳压器 - 标准 Dual uPower Linear RoHS:否 制造商:STMicroelectronics 输出类型: 极性: 输出电压:1.8 V 输出电流:150 mA 负载调节: 最大输入电压:5.5 V 线路调整率: 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:SOT-323-5L |
| MAX6791TPWD3+ | 功能描述:线性稳压器 - 标准 Dual uPower Linear RoHS:否 制造商:STMicroelectronics 输出类型: 极性: 输出电压:1.8 V 输出电流:150 mA 负载调节: 最大输入电压:5.5 V 线路调整率: 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:SOT-323-5L |
| MAX6791TPWD3+T | 功能描述:线性稳压器 - 标准 Dual uPower Linear RoHS:否 制造商:STMicroelectronics 输出类型: 极性: 输出电压:1.8 V 输出电流:150 mA 负载调节: 最大输入电压:5.5 V 线路调整率: 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:SOT-323-5L |
| MAX6791TPWD4+ | 功能描述:线性稳压器 - 标准 Dual uPower Linear RoHS:否 制造商:STMicroelectronics 输出类型: 极性: 输出电压:1.8 V 输出电流:150 mA 负载调节: 最大输入电压:5.5 V 线路调整率: 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:SOT-323-5L |
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