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| 型號： | SP800M |
| 英文描述： | Low Power Microprocessor Supervisory with Battery Switch-Over |
| 中文描述： | 低功耗微處理器監(jiān)控與電池開關(guān)過 |
| 文件頁數(shù)： | 15/24頁 |
| 文件大?。?/td> | 196K |
| 代理商： | SP800M |
Date: 5/25/04 SP691A/693A/800L/800M Low Power Microprocessor Supervisor with Battery Switch-Over Copyright 2004 Sipex Corporation
15
Input Supply Voltage
The Input Supply Voltage (V
CC
) should be a
regulated +5V source. V
CC
connects to V
OUT
via a parallel diode and a large PMOS switch.
The switch carries the entire current load for
currents less than 250mA. The parallel diode
carries any current in excess of 250mA. Both
the switch and the diode have impedances
less than 1
each. Refer to
Figure 24
. The
maximum continuous current is 250mA, but
power-on transients may reach a maximum of 1A.
Backup-Battery Input
The Backup-Battery Input (V
BATT
) is similar
to V
CC
, except the PMOS switch and parallel
diode are much smaller. Refer to
Figure 24
.
Accordingly, the on-resistances of the diode and
the switch are each approximately 10
.
Table 2. Input and Output Status in Battery-Backup Mode; to enter the Battery-Backup Mode, V
CC
must be less than the
reset threshold and less than V
BATT
.
Figure 24. V
CC
and V
BATT
to V
OUT
Switch
SW1
D1
D2
SW2
V
BATT
V
CC
V
OUT
0.1
μ
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