Datasheet

Pin Descriptions
TM Time-out programming input
This input sets the maximum charge time.
The resistor and capacitor values are deter
-
mined using Equation 5. Figure 7 shows the
resistor/capacitor connection.
ICTL
Inrush current control output
ICTL
is driven low during the fault or
charge-complete states of the chip. It is used
to disconnect the capacitor across the battery
pack terminals, preventing inrush currents
from tripping overcurrent protection fea
-
tures in the pack when a new battery is in
-
serted.
BAT Battery voltage input
BAT is the battery voltage sense input. This
potential is generally developed using a
high-impedance resistor divider network
connected between the positive and the
negative terminals of the battery. See Fig-
ure 4 and Equation 1.
VCOMP Voltage loop compensation input
This input uses an external R-C network for
voltage loop stability.
I
TERM
Minimum current termination select
This three-state input is used to set I
MIN
for
fast charge termination. See Table 2.
ICOMP Current loop compensation input
This input uses an external R-C network for
current loop stability.
SNS Charging current sense input
Battery current is sensed via the voltage de
-
veloped on this pin by an external sense re
-
sistor, R
SNS
, connected in series with the
negative terminal of the battery pack. See
Equation 6.
TS Temperature sense input
This input is used to monitor battery tempera
-
ture. An external resistor divider network sets
the lower and upper temperature thresholds.
See Figure 6 and Equations 3 and 4.
TPWM Regulation timebase input
This input uses an external timing capacitor
to ground to set the pulse-width modulation
(PWM) frequency. See Equation 7.
LCOM Common LED output
Common output for LED
1–3
. This output is
in a high-impedance state during initiali
-
zation to read programming input on
DSEL.
MOD Current-switching control output
MOD is a pulse-width modulated push/pull
output that is used to control the charging
current to the battery. MOD switches high
to enable current flow and low to inhibit cur-
rent flow.
LED
1
–
LED
3
Charger display status 1–3 outputs
These charger status output drivers are for
the direct drive of the LED display. Display
modes are shown in Table 1. These outputs are
tri-stated during initialization so that DSEL
can be read.
DSEL Display select input
This three-level input controls the LED
1–3
charge display modes. See Table 1.
V
CC
V
CC
supply
5.0V,
±
10% power
V
SS
Ground
2
bq2054