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| 型号： | SP690AEN-L |
| 厂商： | Exar Corporation |
| 文件页数： | 9/16页 |
| 文件大小： | 0K |
| 描述： | IC SUPERVISOR MPU LP 8NSOIC |
| 标准包装： | 98 |
| 类型： | 简单复位/加电复位 |
| 监视电压数目： | 1 |
| 复位： | 低有效 |
| 复位超时： | 最小为 140 ms |
| 电压 - 阀值： | 4.65V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-SOIC（0.154"，3.90mm 宽） |
| 供应商设备封装： | 8-SOICN |
| 包装： | 管件 |
| 其它名称： | 1016-1221-5 |
FEATURES
The SP690A/692A/802L/802M/805L/805M
provide four key functions:
1. A battery backup switching for CMOS RAM,
CMOS microprocessors, or other logic.
2. A reset output during power-up, power-down
and brownout conditions.
3. A reset pulse if the optional watchdog timer
has not been toggled within a specified time.
4. A 1.25V threshold detector for power-fail
warning, low battery detection, or to monitor a
power supply other than +5V.
The parts differ in their reset-voltage threshold
levels and reset outputs. The SP690A/802L/
805L generate a reset when the supply voltage
drops below 4.65V. The SP692A/802M/805M
THEORY OF OPERATION
The SP690A/692A/802L/802M/805L/805M
microprocessor ( μ P) supervisory circuits
monitor the power supplied to digital circuits
such as microprocessors, microcontrollers, or
memory. The series is an ideal solution for
portable, battery-powered equipment that
requires power supply monitoring. Implementing
this series will reduce the number of
components and overall complexity. The
watchdog functions of this product family will
continuously oversee the operational status of a
system. The operational features and benefits of
the SP690A/692A/802L/802M/805L/805M are
described in more detail below.
Reset Output
generate a reset below 4.40V.
The microprocessor's ( μ P's) reset input starts
The SP690A/692A/802L/802M/805L/805M
are ideally suited for applications in automotive
systems, intelligent instruments, and battery-
powered computers and controllers. All designs
into an environment where it is critical to
monitor the power supply to the μ P and it’s
related digital components will find the
SSP690A/692A/802L/802M/805L/805M ideal.
Regulated +5V
Unregulated
the μ P in a known state. When the μ P is in an
unknown state, it should be held in reset. The
SP690A/SP692A/SP802 assert reset during
power-up and prevent code execution errors
during power-down or brownout conditions.
On power-up, once V CC reaches 1V, RESET is
guaranteed to be a logic low. As V CC rises,
RESET remains low. When V CC exceeds the
reset threshold, RESET will remain low for
200ms, Figure 9 . If a brownout condition
occurs and V CC dips below the reset threshold,
RESET is triggered. Each time RESET is
triggered, it stays low for the reset pulse width
V CC
0.1 μ F
DC
interval. If a brownout condition interrupts a
μ P
RESET
NMI
I/O LINE
GND
RESET
PFO
WDI
V OUT
V CC
PFI
V BATT
R 1
R 2
previously initiated reset pulse, the reset pulse
continues for another 200ms. On power-down,
once V CC goes below the threshold, RESET is
guaranteed to be logic low until V CC drops
below 1V.
BUS
GND
RESET is also triggered by a watchdog timeout.
If WDI remains either high or low for a period
CMOS
RAM
GND
V CC
3.6V
Lithium
Battery
that exceeds the watchdog timeout period (1.6
sec), RESET pulses low for 200mS. As long as
RESET is asserted, the watchdog timer remains
clear. When RESET comes high, the watchdog
resumes timing and must be serviced within
1.6sec. If WDI is tied high or low, a RESET
Figure 12. Typical Operating Circuit
pulse is triggered every 1.8sec (t WD plus t RS ).
Date: 11/29/04
SP690A/692A Low Power Microprocessor Supervisory with Battery Switch-Over
9
? Copyright 2004 Sipex Corporation
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相关代理商/技术参数 |
参数描述 |
|---|---|
| SP690AEN-L/TR | 功能描述:监控电路 LW PWR MICRO 4.65V TEMP -40C to 85C 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 |
| SP690AEP | 制造商:SIPEX 制造商全称:Sipex Corporation 功能描述:Low Power Microprocessor Supervisory with Battery Switch-Over |
| SP690AEP-L | 功能描述:监控电路 LW PWR MICRO 4.65V TEMP -40C to 85C 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 |
| SP690R | 制造商:SIPEX 制造商全称:Sipex Corporation 功能描述:3.0V/3.3V Low Power Microprocessor Supervisory with Battery Switch-Over |
| SP690RCN | 制造商:SIPEX 制造商全称:Sipex Corporation 功能描述:3.0V/3.3V Low Power Microprocessor Supervisory with Battery Switch-Over |
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