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参数资料
| 型号： | DS1238 |
| 英文描述： | MicroManager |
| 中文描述： | 微管理器芯片 |
| 文件页数： | 9/14页 |
| 文件大小： | 216K |
| 代理商： | DS1238 |
DS1238
9 of 14
POWER SWITCHING
Figure 9
Note: If freshness on the DS1238 is not used,
PF
on the DS1336 may be tied to OUT1. This will free IN4, OUT4,
and V
BAT01
for system use.
TIMING DIAGRAMS
This section provides a description of the timing diagrams shown in Figure 10 and Figure 11. Figure 10
illustrates the relationship for power down. As V
CC
falls, the IN pin voltage drops below V
TP
. As a result,
the processor is notified of an impending power failure via an active
NMI
. This gives the processor time
to save critical data in nonvolatile SRAM. As the power falls further, V
CC
crosses V
CCTP
, the power
monitor trip point. When V
CC
reaches V
CCTP
, and active RST and
RST
are given. At this time,
CEO
is
brought high to write-protect the RAM. When the V
CC
reaches V
BAT
, a power-fail is issued via the PF pin.
Figure 11 shows the power-up sequence. As V
CC
slews above V
BAT
, the PF pin is deactivated. An active
reset occurs as well as an
NMI
. Although the
NMI
may be short due to slew rates, reset will be
maintained for the standard t
RPU
timeout period . At a later time, if the IN pin falls below V
TP
, a new
NMI
will occur. If the processor does not issue an
ST
, a watchdog reset will also occur. The second
NMI
and
RST are provided to illustrate these possibilities.
相关PDF资料 |
PDF描述 |
|---|---|
| DS1239 | MicroManager Chip |
| DS1243 | 0.05uV/C max, Single-Supply CMOS Operational Amplifier 10-MSOP -40 to 125 |
| DS1243Y | 64K NV SRAM with Phantom Clock |
| DS1244Y | Low-Power, 24-Bit ANALOG-TO-DIGITAL CONVERTER |
| DS1244W-120IND | 256k NV SRAM with Phantom Clock |
相关代理商/技术参数 |
参数描述 |
|---|---|
| DS1238-10 | 功能描述:监控电路 RoHS:否 制造商:STMicroelectronics 监测电压数: 监测电压: 欠电压阈值: 过电压阈值: 输出类型:Active Low, Open Drain 人工复位:Resettable 监视器:No Watchdog 电池备用开关:No Backup 上电复位延迟（典型值）:10 s 电源电压-最大:5.5 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:UDFN-6 封装:Reel |
| DS1238-10+ | 功能描述:监控电路 RoHS:否 制造商:STMicroelectronics 监测电压数: 监测电压: 欠电压阈值: 过电压阈值: 输出类型:Active Low, Open Drain 人工复位:Resettable 监视器:No Watchdog 电池备用开关:No Backup 上电复位延迟（典型值）:10 s 电源电压-最大:5.5 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:UDFN-6 封装:Reel |
| DS1238-10N | 功能描述:监控电路 RoHS:否 制造商:STMicroelectronics 监测电压数: 监测电压: 欠电压阈值: 过电压阈值: 输出类型:Active Low, Open Drain 人工复位:Resettable 监视器:No Watchdog 电池备用开关:No Backup 上电复位延迟（典型值）:10 s 电源电压-最大:5.5 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:UDFN-6 封装:Reel |
| DS1238-10N+ | 功能描述:监控电路 RoHS:否 制造商:STMicroelectronics 监测电压数: 监测电压: 欠电压阈值: 过电压阈值: 输出类型:Active Low, Open Drain 人工复位:Resettable 监视器:No Watchdog 电池备用开关:No Backup 上电复位延迟（典型值）:10 s 电源电压-最大:5.5 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:UDFN-6 封装:Reel |
| DS1238-5 | 功能描述:监控电路 RoHS:否 制造商:STMicroelectronics 监测电压数: 监测电压: 欠电压阈值: 过电压阈值: 输出类型:Active Low, Open Drain 人工复位:Resettable 监视器:No Watchdog 电池备用开关:No Backup 上电复位延迟（典型值）:10 s 电源电压-最大:5.5 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:UDFN-6 封装:Reel |
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