2
Pin Descriptions
SNS
Current-sense input
Enables the bq2000T to sense the battery
current via the voltage developed on this
pin by an external sense-resistor con-
nected in series with the battery pack
VSS
System Ground
LED
Charge-status output
Open-drain output that indicates the
charging status by turning on, turning off,
or flashing an external LED
BAT
Battery-voltage input
Battery-voltage sense input. A simple resis-
tive divider, across the battery terminals,
generates this input.
TS
Temperature-sense input
Input for an external battery-temperature
monitoring circuit. An external resistive
divider network with a negative tempera-
ture-coefficient thermistor sets the lower
and upper temperature thresholds.
RC
Timer-program input
RC input used to program the maximum
charge-time, hold-off period, and trickle
rate during the charge cycle, and to dis-
able or enable top-off charge
VCC
Supply-voltage input
MOD
Modulation-control output
Push-pull output that controls the charg-
ing current to the battery. MOD switches
high to enable charging current to flow
and low to inhibit charging- current flow.
Functional Description
The bq2000T is a versatile, multi-chemistry battery-
charge control device. See Figure 1 for a functional
block diagram and Figure 2 for the state diagram.
bq2000T
Figure 1. Functional Block Diagram
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