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| 型号： | SP690TEN-L |
| 厂商： | Exar Corporation |
| 文件页数： | 10/16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： | 3.08V |
| 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： | 1016-1222-5 |
The SP805L/M active-high RESET output is
the inverse of the SP690A/SP692A/SP802 RE-
SET output, and is valid with V CC down to 1V.
Some μ P's, such as Intel's 80C51, require an
active-high reset pulse.
Watchdog Input
The watchdog circuit monitors the μ P's activity.
If the μ P does not toggle the watchdog input
(WDI) within 1.6sec, a reset pulse is triggered.
The internal 1.6sec timer is cleared by either a
reset pulse or by floating the WDI input. As long
as RESET is asserted or the WDI input is
floating, the timer remains cleared and does not
count. As soon as RESET is released and WDI
is driven high or low, the timer starts counting.
It can detect pulses as short as 50ns.
Power-Fail Comparator
The Power-Fail Comparator can be used as an
under-voltage detector to signal the failing of a
power supply (it is completely separate from the
rest of the circuitry and does not need to be
dedicated to this function). The PFI input is
compared to an internal 1.25V reference. If PFI
is less than 1.25V, PFO goes low. The external
voltage divider drives PFI to sense the
unregulated DC input to the +5V regulator. The
voltage-divider ratio can be chosen such that the
voltage at PFI falls below 1.25V just before the
+5V regulator drops out. PFO then triggers an
interrupt which signals the μ P to prepare for
power-down.
When V BATT connects to V OUT , the power-fail
comparator is turned off and PFO is forced low
to conserve backup-battery power.
Backup-Battery Switchover
V BATT
V CC
In the event of a brownout or power failure, it
may be necessary to preserve the contents of
SW1
V OUT
D1
D3
GND
D2
SW2
RAM. With a backup battery installed at V BATT ,
the RAM is assured to have power if V CC fails.
As long as V CC exceeds the reset threshold,
V OUT connects to V CC through a 0.6 ? PMOS
power switch. Once V CC falls below the reset
threshold, V CC or V BATT , whichever is higher,
switches to V OUT . V BATT connects to V OUT
through a 5 ? switch only when V CC is below the
reset threshold and V BATT is greater than V CC .
V C C > R e s e t T h r e s h o l d
V C C < R e s e t T h r e s h o l d a n d
V C C < R e s e t T h r e s h o l d a n d
CONDITION SW1 SW2
O p e n C l o s e d
O p e n C l o s e d
V C C > V B A T T
C l o s e d O p e n
V C C < V B A T T
Reset Threshold = 4.65V in SP690A/802L/805L
Reset Threshold = 4.40V in SP692A/802M/805M
Figure 13. BACKUP-BATTERY Switchover Block Diagram
When V CC exceeds the reset threshold, it is
connected to V OUT , regardless of the voltage
applied to V BATT Figure 13 . During this time,
the diode (D1) between V BATT and V OUT will
conduct current from V BATT to V OUT if V BATT is
more than .6V above V OUT .
When V BATT connects to V OUT , backup mode is
activated and the internal circuitry will be pow-
ered from the battery Figure 14 . When V CC is
just below V BATT , in the backup mode the
current drawn from V BATT will be typically
30 μ A. When V CC drops to more than 1V below
V BATT , the internal switchover comparator shuts
off and the supply current falls to less than 0.6 μ A.
Date: 11/29/04
SP690A/692A Low Power Microprocessor Supervisory with Battery Switch-Over
10
? Copyright 2004 Sipex Corporation
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相关代理商/技术参数 |
参数描述 |
|---|---|
| SP690TEN-L/TR | 功能描述:监控电路 LW PWR MICRO 5.5V 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 |
| SP690TEP | 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 |
| SP691 AL | 制造商:Thomas & Betts 功能描述:Flush Service Floor Boxes |
| SP691A | 制造商:SIPEX 制造商全称:Sipex Corporation 功能描述:Evaluation Board Manual |
| SP691A_05 | 制造商:SIPEX 制造商全称:Sipex Corporation 功能描述:Low Power Microprocessor Supervisory with Battery Switch-Over |
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