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BQ2002E Datasheet(PDF) 2 Page - Texas Instruments

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Part No. BQ2002E
Description  NiCd/NiMH Fast-Charge Management ICs
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Maker  TI [Texas Instruments]
Homepage  http://www.ti.com
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BQ2002E Datasheet(HTML) 2 Page - Texas Instruments

 
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Pin Descriptions
TM
Timer mode input
A three-level input that controls the settings
for the fast charge safety timer, voltage ter-
mination mode, top-off, pulse-trickle, and
voltage hold-off time.
LED
Charging output status
Open-drain output that indicates the charging
status.
BAT
Battery input voltage
The battery voltage sense input. The input to
this pin is created by a high-impedance re-
sistor divider network connected between
the positive and negative terminals of the
battery.
VSS
System ground
TS
Temperature sense input
Input for an external battery temperature
monitoring thermistor.
VCC
Supply voltage input
5.0V
±20% power input.
INH
Charge inhibit input
When high, INH suspends the fast charge in
progress.
When returned low, the IC re-
sumes operation at the point where initially
suspended.
CC
Charge control output
An open-drain output used to control the
charging current to the battery. CC switch-
ing to high impedance (Z) enables charging
current to flow, and low to inhibit charging
current. CC is modulated to provide top-off,
if enabled, and pulse trickle.
Functional Description
Figure 2 shows a state diagram and Figure 3 shows a
block diagram of the bq2002E/G.
Battery Voltage and Temperature
Measurements
Battery voltage and temperature are monitored for
maximum allowable values. The voltage presented on
the battery sense input, BAT, should represent a
single-cell potential for the battery under charge. A
resistor-divider ratio of
RB1
RB2
= N - 1
is recommended to maintain the battery voltage within
the valid range, where N is the number of cells, RB1 is
the resistor connected to the positive battery terminal,
and RB2 is the resistor connected to the negative bat-
tery terminal. See Figure 1.
Note: This resistor-divider network input impedance to
end-to-end should be at least 200k
Ω and less than 1 MΩ.
2
bq2002E/G
Fg2002E/G01.eps
bq2002E/G
BAT
VSS
N
T
C
bq2002E/G
VCC
VCC
PACK +
TS
VSS
BAT pin connection
Thermistor connection
TM
NTC = negative temperature coefficient thermistor.
RT
R3
R4
RB1
RB2
Mid-level
setting for TM
Figure 1. Voltage and Temperature Monitoring and TM Pin Configuration


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