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SLUS810A – SEPTEMBER 2008 – REVISED DECEMBER 2008
TERMINAL FUNCTIONS (continued)
TERMINAL
NAME
NO.
'72, '73
14
'74
14
'75
14
I
Timer Programming Input. TMR controls the pre-charge and fast-charge safety timers. Connect TMR to VSS
to disable all safety timers. Connect a 18 kΩ to 72 kΩ resistor between TMR and VSS to program the timers
a desired length. Leave TMR unconnected to set the timers to the default values.
Termination Disable Input. Connect TD high to disable charger termination. Connect TD to VSS to enable
charger termination. TD is checked during startup only and cannot be changed during operation. See the TD
section in this datasheet for a description of the behavior when termination is disabled. TD is internally pulled
down to VSS with ~285 kΩ. Do not leave TD unconnected to ensure proper operation.
Termination Current Programming Input. Connect a 0
Ω
to 15 kΩ resistor from ITERM to VSS to program the
termination current. Leave ITERM unconnected to set the termination current to the default 10% termination
threshold.
System Enable Input. Connect SYSOFF high to turn off the FET connecting the battery to the system output.
When an adapter is connected, charging is also disabled. Connect SYSOFF low for normal operation.
SYSOFF is internally pulled up to V
BAT
through a large resistor (~5 MΩ). Do not leave SYSOFF unconnected
to ensure proper operation.
Fast Charge Current Programming Input. Connect a 590
Ω
to 3 kΩ resistor from ISET to VSS to program the
fast charge current level. Charging is disabled if ISET is left unconnected. While charging, the voltage at ISET
reflects the actual charging current and can be used to monitor charge current. See the
section
for more details.
There is an internal electrical connection between the exposed thermal pad and the VSS pin of the device.
The thermal pad must be connected to the same potential as the VSS pin on the printed circuit board. Do not
use the thermal pad as the primary ground input for the device. VSS pin must be connected to ground at all
times.
I/O
DESCRIPTION
TMR
TD
15
–
–
I
ITERM
–
15
–
I
SYSOFF
–
–
15
I
ISET
16
16
16
I/O
Thermal
Pad
–
Table 1. EN1/EN2 Settings
EN2
0
0
1
1
EN1
0
1
0
1
Maximum input current into IN pin
100 mA. USB100 mode
500 mA. USB500 mode
Set by an external resistor from ILIM to VSS
Standby (USB suspend mode)
Copyright © 2008, Texas Instruments Incorporated
7
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