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Application Note 1064
TABLE 2. JUMPER SETTINGS
ON
JUMPER
POSITION
USB TO VIN
FUNCTION
USB input selected
OFF
123456789
JP1
WALL CUBE TO
VIN
Wall adapter input selected
FIGURE 1. INITIAL DIP SWITCH SETTINGS
DIP Switch Settings
A 9-bit DIP switch is provided to set up voltage, current reference,
end-of-charge (EOC) current, and so on. The functionality of the
bits are described in Table 1.
JP2
JP3
JP4
Shunt Installed
Shunt installed
Not installed
IREF and V2P8
IREF and GND
connect VBAT pin to battery
current meter can replace shunt
Battery attached to Thermistor at J2
Default
Setting USB 500mA mode
Setting USB 100mA mode
TABLE 1. DIP SWITCH PIN DESCRIPTIONS
Initial Board Jumper Positioning (Refer to
BIT
1
2
3
4
5
6
7
8
9
DESCRIPTION
Adjustable
TIMEOUT
TIMEOUT
disable/enable
Charger
enable/disable
IREF setting 1
IREF setting 2
IMIN setting
TEMP normal
TEMP high
TEMP low
ON
5 hours
50 mins
TIMEOUT
disabled
charger
disabled
Add 0.5A
Add 1A
100mA
normal
too hot
too cold
OFF
3 hours
30 mins
TIMEOUT
enabled
charger
enabled
I CHG = 0.5A
When both off
50mA
REMARK
All off
simulates
battery
removal
Figure 3)
JP1 - Selects the VIN pin to be connected to either a wall
adapter, or to a USB connector. If the J1 connector is being used,
a shunt must be installed across ‘WALL CUBE TO VIN’, or if the J3
(USB) connector is being used, a shunt must be installed across
‘USB TO VIN’. J1, J3 and JP1 can be ignored if the power supply is
connected directly to VIN test point, which is directly connected
to VIN pin of the IC. A current meter, to measure the input
current, can replace the shunt mentioned above.
JP2 - Can connect the VBAT pin to the battery. If the J2 connector
is being used, a shunt must be installed across JP2. In this case,
a current meter can also replace the shunt to measure the VBAT
current.
JP3 - Can connect the TEMP pin to the battery. Usually no shunt
is needed for JP3, as the Evaluation board can simulate various
battery thermal conditions. Only when a battery with a attached
thermistor is applied on J2 does it become necessary to install a
shunt across JP3, simultaneously turning off bits 7, 8, and 9 on
the DIP switch.
JP4 - Selects USB modes; a shunt across IREF and V2P8 will set
USB 500mA mode; a shunt across IREF and GND will set USB
100mA mode. When the charge current is programmed by the
resistors connected to the IREF pin, no shunt should be installed
on JP4.
2
AN1064.1
July 26, 2011
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