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IMP690A

更新时间： 2024-01-05 12:02:49
品牌 Logo 应用领域
IMP 电池微处理器监控
页数 文件大小 规格书
10页 227K
描述
レP POWER SUPPLY SUPERVISOR WITH BATTERY BACKUP SWITCH

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IMP690A 技术参数

生命周期：Obsolete包装说明：DIP, DIP8,.3
Reach Compliance Code：unknownECCN代码：EAR99
HTS代码：8542.39.00.01风险等级：5.84
Is Samacsys：N模拟集成电路 - 其他类型：POWER SUPPLY SUPPORT CIRCUIT
JESD-30 代码：R-CDIP-T8端子数量：8
封装主体材料：CERAMIC, METAL-SEALED COFIRED封装代码：DIP
封装等效代码：DIP8,.3封装形状：RECTANGULAR
封装形式：IN-LINE电源：1.1/5.5 V
认证状态：Not Qualified子类别：Power Management Circuits
最大供电电流 (Isup)：0.1 mA表面贴装：NO
技术：CMOS端子形式：THROUGH-HOLE
端子节距：2.54 mm端子位置：DUAL
Base Number Matches：1

IMP690A 数据手册

 浏览型号IMP690A的Datasheet PDF文件第4页浏览型号IMP690A的Datasheet PDF文件第5页浏览型号IMP690A的Datasheet PDF文件第6页浏览型号IMP690A的Datasheet PDF文件第8页浏览型号IMP690A的Datasheet PDF文件第9页浏览型号IMP690A的Datasheet PDF文件第10页 
IMP690A, 692A, 802L, 802M, 805L  
Application Information  
TM  
Backup Power Sources - SuperCap  
Operation Without a Backup Power Source  
Capacitor storage, with very high values of capacitance, can be When operating without a back-up power source, the VBATT pin  
used as a back-up power source instead of batteries. SuperCapTM should be connected to GND and VOUT should be connected to  
are capacitors with capacities in the fractional farad range. A 0.1  
farad SuperCapTM would provide a useful backup power source.  
V
CC, since power source switchover will not occur. Connecting  
VOUT to VCC eliminates the voltage drop due to the ON-resistance  
Like the battery supply, it is important that the capacitor voltage of the PMOS switch.  
remain below the maximum voltages shown in Table 2. Although  
Power-Fail Comparator  
the circuit of Figure 5 shows the most simple way to connect the  
SuperCapTM, this circuit cannot insure that an overvoltage condi-  
tion will not occur since the capacitor will ultimately charge up to  
The Power Fail feature is an independent voltage monitoring  
function that can be used for any number of monitoring activities.  
The PFI function can provide an early sensing of power supply  
failure by sensing the voltage of the unregulated DC ahead of  
the regulated supply sensing seen by the backup-battery  
switchover circuitry.  
VCC. To insure that an overvoltage condition does not occur,  
the circuit of Figure 6 is preferred. In this circuit configuration, the  
diode-resistor pair clamps the capacitor voltage at one diode-  
drop below VCC. VCC itself should be regulated within ±5% of  
5V for the IMP692A/802M or within ±10% of 5V for the  
IMP690A/802L/805L to insure that the storage capacitor does not  
achieve an overvoltage state.  
The PFI pin is compared to a 1.25V internal reference. If the volt-  
age at the PFI pin is less than this reference voltage, the PFO pin  
goes low. By sensing the voltage of the raw DC power supply, the  
microprocessor system can prepare for imminent power-loss,  
especially if the battery backup supply is not enabled. The input  
voltage at the PFI pin results from a simple resistor voltage  
divider as shown in Figure 7.  
Note: SuperCapTM is a trademark of Baknor Industries  
+5V  
VCC  
VOUT  
To Static RAM  
+5V  
VBATT RESET  
(RESET)  
To µP  
VCC  
+
IMP690A  
IMP692A  
IMP802L  
IMP802M  
IMP805L  
R1  
R2  
0.1F  
PFI  
PFO  
GND  
690A_07.eps  
( ) IMP805L  
GND  
Figure 5. Capacitor as a backup power source  
+5V  
+5V  
PFO  
0V  
A
B
VCC  
VOUT  
To Static RAM  
VBATT RESET  
To µP  
5R  
5R  
2
R +R  
1 2  
2
IMP692A  
IMP802M  
< 1.25V  
> 1.25V  
A
B
+
R +R  
1
2
100k  
0.1F  
690A_09.eps  
GND  
Figure 7. Simple Voltage divider sets PFI trip point  
690A_08.eps  
( ) IMP805L  
Figure 6. Capacitor as back-up Power Source - Voltage  
clamped to 0.5V below VCC  
7
1...45678910

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