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參數(shù)資料
| 型號： | ASM802LAEPA |
| 元件分類： | 電源管理 |
| 英文描述： | 2-CHANNEL POWER SUPPLY MANAGEMENT CKT, PDIP8 |
| 封裝： | PLASTIC, DIP-8 |
| 文件頁數(shù)： | 9/13頁 |
| 文件大?。?/td> | 323K |
| 代理商： | ASM802LAEPA |
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Notice: The information in this document is subject to change without notice
ASM690A / 692A
ASM802L / 802M
ASM805L
P Power Supply Supervisor With Battery Backup Switch
rev 1.0
October 2003
Backup Power Sources - Batteries
Battery voltage selection is important to insure that the
battery does not discharge through the parasitic device diode
D1 (see Figure 3) when VCC is less than VBATT and VCC >
VRT.
Table 2: Maximum Battery Voltages
Although most batteries that meet the requirements of Table
2 are acceptable, lithium batteries are very effective backup
source due to their high-energy density and very low self-
discharge rates.
Battery replacement while Powered
Batteries can be replaced even when the device is in a
powered state as long as VCC remains above the reset
threshold voltage VRT. In the ASM devices, a floating VBATT
pin will not cause a powersupply switchover as can occur in
some other supervisory circuits. If VBATT is not used, the pin
should be grounded.
Backup Power Sources - SuperCap
Capacitor storage, with very high values of capacitance, can
be used as a back-up power source instead of batteries.
SuperCap are capacitors with capacities in the fractional
farad range. A 0.1 farad SuperCap would provide a useful
backup power source. Like the battery supply, it is important
that the capacitor voltage remain below the maximum
voltages shown in Table 2. Although the circuit of Figure 4
shows the most simple way to connect the SuperCap, this
circuit cannot insure that an over voltage condition will not
occur since the capacitor will ultimately charge up to VCC. To
insure that an over voltage condition does not occur, the
circuit of Figure 5 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 ASM692A/802M or within ±10% of 5V for the
ASM690A/802L/805L to insure that the storage capacitor
does not achieve an over voltage state.
Note: SuperCapTM is a trademark of Baknor Industries
Part Number
MAXIMUM Battery Voltage
ASM690A
4.80
ASM802L
4.80
ASM805L
4.80
ASM692A
4.55
ASM802M
4.55
100K
ASM692A
ASM802M
VCC
VOUT
VBATT
RESET
(RESET)
GND
To P
+
0.1F
Figure 5: Capacitor as a backup power source
Voltage clamped to 0.5V below VCC
VCC
VOUT
VBATT
RESET
(RESET)
GND
To P
+5V
0.1F
+
Figure 4: Capacitor as a backup power source
D2
D1
To SRAM
D1
ASM692A
ASM802M
To SRAM
+5V
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| ASM802LCPA | 制造商:ALSC 制造商全稱:Alliance Semiconductor Corporation 功能描述:UP Power Supply Supervisor With Battery Backup Switch |
| ASM802LCPAF | 制造商:PULSECORE 制造商全稱:PulseCore Semiconductor 功能描述:μP Power Supply Supervisor With Battery Backup Switch |
| ASM802LCSA | 制造商:ALSC 制造商全稱:Alliance Semiconductor Corporation 功能描述:UP Power Supply Supervisor With Battery Backup Switch |
| ASM802LCSAF | 制造商:PULSECORE 制造商全稱:PulseCore Semiconductor 功能描述:μP Power Supply Supervisor With Battery Backup Switch |
| ASM802LEPA | 制造商:PULSECORE 制造商全稱:PulseCore Semiconductor 功能描述:μP Power Supply Supervisor With Battery Backup Switch |
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