3
AN1260.1
January 26, 2010
Description of Jumper Settings
JP1 - A shunt installed on JP1 connects the input
source from connector J1 to the circuit if input current
measurement is not needed. The shunt can be
replaced by a current meter if input current
measurement is needed, as shown in Figure 1.
JP2 - A shunt installed on JP2 connects the input
source from the USB port connector to the USB pin if a
USB port is used for the evaluation.
JP3 - Connects the EN pin to a pull-up voltage or GND.
The pull-up voltage is regulated 3.3V from the input
source (either Cradle or USB). If there is no shunt
installed on JP3, 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 floating. If the shunt is installed
across the two jumper pins labeled as “Disable”, the EN
pin is driven to logic HIGH, which disables the charger.
JP4 - 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.
JP5 - Parallels an additional 11.8k resistor to the IMIN
pin (total R
IMIN
= 5.9k), such that the End-of-Charge
Current will be increased to 93mA (R
IMIN
is 11.8k and
the EOC current is 46.5mA without the shunt).
JP6 - A shunt installed on JP6 connects the BAT pin to
the output connector J3 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.
JP7 - Parallels an additional 23.7k resistor to the ICDL
pin (total R
ICDL
= 11.85k), such that the cradle charge
current will be increased to 0.575A (R
IREF
is 23.7k and
the charge current is 0.28A if the shunts on both JP7
and JP8 are removed).
JP8 - Parallels an additional 14.7k resistor to the ICDL
pin (when JP7 is installed, total R
ICDL
= 6.56k), such
that the cradle charge current will be increased to
1.04A.
PS1
- +
PS3
+ -
+ -
E-LOAD
I1
PS2
- +
I2
FIGURE 1. CONNECTION OF INSTRUMENTS
Application Note 1260
