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Application Note 1170
Description of Jumper Settings
JP1 - Connects the EN pin to a pull-up voltage or GND. The
pull-up voltage is either the BAT voltage (When a shunt is
installed on JP3) or an external 3.3V power source (when
the shunt on JP3 is removed and a +3.3V supply is
connected to pin 1(at the right) of JP3. If there is no shunt
installed on JP1, the EN pin is internally pulled down to logic
LOW, which enables the charger. If a shunt is installed
across the two jumper pins labeled as “Enable”, the EN pin
is driven to logic LOW, the charger is enabled, same as
JP7 - Parallels an additional 57.6K resistor to the ICDL pin
(total RICDL = 19.2K), such that the cradle charge current
will be increased to 0.95A.
JP8 - ON/OFF control for USB input. Install a jumper shunt
on USB OFF position to turn off the USB charge but has no
impact on the cradle input charge.
JP9 - A shunt installed on JP9 connects the input source
from the USB port connector to the USB pin if a USB port is
used for the evaluation.
floating. If the shunt is installed across the two jumper pins
labeled as “Disable” and the pull-up voltage is above 2V, the
EN pin is driven to logic HIGH, which disables the charger.
JUMPER
TABLE 1. JUMPER SETTING SUMMARY
POSITION FUNCTION
JP2 - A shunt installed on JP2 connects the input source
from connector J1 to the circuit if input current measurement
JP1
Shunt on Disable
Shunt on Enable
Charger disabled
Charger enabled
is not needed. The shunt can be replaced by a current meter
Shunt not installed Charger enabled
if input current measurement is needed, as shown in
Figure 1.
JP3 - Selects the power source for logic pull-up and the LED
supply. If a shunt is installed, the BAT voltage is selected as
the power source. If the shunt is removed, an external power
supply of +3.3V can be connected from Pin1 (at the right) to
GND to provide the pull-up and LED supply power. The
purpose is to exclude the extra current through the charger
when characterizing small currents such as EOC and
JP2
JP3
JP4
JP5
JP6
Shunt installed
Shunt installed
Shunt installed
Shunt installed
Shunt installed
Connects input source at J1 to
CRDL pin
Select BAT as the pull-up source
Sets CRDL EOC current to 84mA
Sets CRDL charging current to
0.55A, if shunt on JP7 is not
installed
Connects BAT to J2
quiescent currents.
JP4 - Parallels an additional 316K resistor to the IMIN pin
(total RIMIN = 158K), such that the End-of-Charge Current
JP7
Shunt installed
Sets CRDL charging current to
0.95A, if shunt on JP5 is also
installed
will be increased to 84mA (R IMIN is 316K and the EOC
current is 40mA without the shunt).
JP5 - Parallels an additional 57.6K resistor to the ICDL pin
(total RICDL = 28.8K), such that the cradle charge current
JP8
Shunt on USB OFF Turns off USB charge
Shunt on USB ON Turns on USB charge
Shunt not installed Turns off USB charge
will be increased to 0.55A (R IREF is 57.6K and the charge
current is 0.26A if the shunts on both JP5 and JP7 are
JP9
Shunt installed
Connects input source from USB
port connector to USB pin
removed).
JP6 - A shunt installed on JP6 connects the BAT pin to the
output connector J2 if output current measurement is not
needed. The shunt can be replaced by a current meter if
output current measurement is needed as shown in
Figure 1.
4
AN1170.1
August 16, 2005
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