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參數(shù)資料
| 型號： | TPS3106XXX |
| 廠商： | Texas Instruments, Inc. |
| 英文描述： | UltraLow Supply-Current/Supply-Voltage Supervisory Circuits |
| 中文描述： | 超低Supply-Current/Supply-Voltage監(jiān)控電路 |
| 文件頁數(shù)： | 13/23頁 |
| 文件大小： | 517K |
| 代理商： | TPS3106XXX |
www.ti.com
APPLICATION INFORMATION
R1
R2
V
TRIP
V
IT(S)
1
(1)
TPS3106E09DBV
SENSE
GND
R1
R2
V
DD
RSTVDD
RSTSENSE
R3
2 Cell
NiMH
Reset Output
MR
TPS3103xxx
TPS3106xxx
TPS3110xxx
SLVS363E–AUGUST 2001–REVISED SEPTEMBER 2007
The TPS31xx family has a quiescent current in the 1-
μ
A to 2-
μ
A range. When RESET is active, triggered by the
voltage monitored at V
DD
, the quiescent current increases to about 20
μ
A (see the
Electrical Characteristics
).
In some applications it is necessary to minimize the quiescent current even during the reset period. This is
especially true when the voltage of a battery is supervised and the RESET is used to shut down the system or
for an early warning. In this case the reset condition will last for a longer period of time. The current drawn from
the battery should almost be zero, especially when the battery is discharged.
For this kind of application, either the TPS3103 or TPS3106 is a good fit. To minimize current consumption,
select a version where the threshold voltage is lower than the voltage monitored at V
DD
. The TPS3106 has two
reset outputs. One output (RSTVDD) is triggered from the voltage monitored at V
DD
. The other output
(RSTSENSE) is triggered from the voltage monitored at SENSE. In the application shown in
Figure 8
, the
TPS3106E09 is used to monitor the input voltage of two NiCd or NiMH cells. The threshold voltage (V
(TH)
= 0.86
V) was chosen as low as possible to ensure that the supply voltage is always higher than the threshold voltage
at V
DD
. The voltage of the battery is monitored using the SENSE input. The voltage divider was calculated to
assert a reset using the RSTSENSE output at 2
×
0.8 V = 1.6 V.
where:
V
TRIP
is the voltage of the battery at which a reset is asserted and
V
IT(S)
is the threshold voltage at SENSE = 0.551 V.
R1 was chosen for a resistor current in the 1-
μ
A range.
With V
TRIP
= 1.6 V:
R1
≡
1.9
×
R2
R1 = 820 k
, R2 = 430 k
Figure 8. Battery Monitoring with 3-
μ
A Supply Current for Device and Resistor Divider
Copyright 2001–2007, Texas Instruments Incorporated
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相關代理商/技術參數(shù) |
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| TPS3110 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:ULTRALOW SUPPLY CURRENT/SUPPLY VOLTAGE SUPERVISORY CIRCUITS |
| TPS311009DVB | 制造商:TI 制造商全稱:Texas Instruments 功能描述:ULTRALOW SUPPLY CURRENT/SUPPLY VOLTAGE SUPERVISORY CIRCUITS |
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