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PDF TK65010TL Data sheet ( Hoja de datos )
| Número de pieza | TK65010TL | |
| Descripción | BATTERY VOLTAGE MONITOR | |
| Fabricantes | TOKO | |
| Logotipo |  |
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ADVANCED
INFORMATION
FEATURES
s Very Low Quiescent Current ( 5 µA)
s Dual Comparator Outputs
s Single Monitor Input
s Miniature Package (SOT-23-5)
TK65010
BATTERY VOLTAGE MONITOR
APPLICATIONS
s Battery Powered Systems
s Cellular Telephones
s Pagers
s Personal Communications Equipment
DESCRIPTION
The TK65010 battery voltage monitor is designed for
portable battery powered systems where board space and
cost are important design considerations. The proprietary
monitoring architecture of the TK65010 allows two separate
warning thresholds to be set utilizing a single resistor
divider and single input pin.
The first warning indicator, a Low Battery Output (LBO), is
intended to warn the battery powered system of a low
battery condition. In such a condition, the LBO may be
used to alert the system to illuminate a low battery indicator
and to take appropriate action preparing for battery failure.
TK65010
VIN
01S
GND
VMON
The second warning indicator, a Dead Battery Output
(DBO), is intended to be used by the system for shutdown
purposes. The availability of the DBO allows the system to
shut down in order to minimize deep discharge of the
battery.
The two warning indicators can be implemented utilizing
the TK65010 and only two external components.
The TK65010 is available in a miniature 5-pin SOT-23-5
surface mount package.
VCC
BLOCK DIAGRAM
710 mV
ORDERING INFORMATION
TK65010
Tape/Reel Code
VMON
GND
700 mV
690 mV
January 1999 TOKO, Inc.
TAPE/REEL CODE
TL: Tape Left
LBO
DBO
LBO
DBO
Page 1
1 page  
TK65010
DESIGN CONSIDERATIONS
In order to design a voltage monitor utilizing the TK65010,
the two external resistors comprising the resistor divider
must be properly selected. Selecting the ratio of the
resistors will establish the lower monitoring threshold
(DBO). Selecting the value of the R1 will establish the
upper monitoring threshold (LBO) relative to the lower
(DBO) threshold. The value of R2 will be dictated by the
ratio R1/R2 and the value of R1. For the following
explanations, please refer to the circuit diagram of
Figure 3.
SETTING THE DBO THRESHOLD
As mentioned above, the ratio of R1/R2 established the
”dead battery” threshold. The dead battery comparator
trips when the voltage on the VMON pin passes through
approximately 690 mV and the current into the VMON pin is
approximately zero. Given the required dead battery
threshold, the ratio R1/R2 can be selected utilizing the
following equation:
DBO Threshold = 690 mV x (1 + R1/R2)
or
R1/R2 = (DBO Threshold - 690 mV) / 690 mV
RESISTOR TOLERANCE CONSIDERATIONS
The tolerance of the LBO and DBO thresholds will have a
significant dependence upon the tolerance of the resistive
components used in the resistor divider. When utilizing the
previously described equations for setting the LBO and
DBO thresholds, it is possible that optimal values of the
resistive elements R1 and R2 may be relatively large. Since
large resistive components are not always available with
tight tolerances, an alternate method can be used for
applications where tighter tolerances are required.
The purpose of the resistor divider connected between the
Battery Input and the VMON pin is twofold. The first purpose
is to appropriately select the divider ratio such that the
DBO threshold is set to the desired level. The second
purpose is to select the absolute resistor values such that
the LBO threshold is set to an appropriate level relative to
the DBO threshold. Effectively, an attenuated voltage
source with a relatively large output impedance is driving
the VMON pin. This scenario is illustrated in Figure 4.
VIN
R1
SETTING THE LBO THRESHOLD
The threshold of the LBO comparator will be at a value
greater than the DBO threshold. The value of resistor
value R1 dictates the difference between the LBO and
DBO thresholds as follows:
VMON
R2
LBO Threshold = DBO Threshold x 1.029 + R1 x 580 nA
or
R1 = (LBO Threshold - DBO Threshold x 1.029) / 580 nA
BATTERY IN
R1
VIN
GND
VMON
R2 IFB
LBO
DBO
LOW BATTERY
DEAD BATTERY
R1 x R2
R1 + R2
VIN x R2
R1 + R2
+
VMON
FIGURE 4
FIGURE 3
January 1999 TOKO, Inc.
Page 5
5 Page | ||
| Páginas | Total 8 Páginas | |
| PDF Descargar | [ Datasheet TK65010TL.PDF ] | |
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