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Application Note 1206
Detailed Description
The ISL9204EVAL1 is a complete evaluation platform
addressing all datasheet specifications and functionalities.
The jumpers on the board facilitate the programming of the
charge current, different charging conditions, and can be
used to make other necessary connections, such as current
measurement.
Jumpers
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) an external 3.3V power source (when the
shunt on JP3 is removed and a +3.3V supply is connected to
the upper pin 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 floating. If the shunt
JP4 - Parallels an additional 274k resistor to the IMIN pin,
such that the End-of-Charge Current will be increased to
30mA (R IMIN is 274k and the EOC current is 15mA without
the shunt).
JP5 - Parallels an additional 59k resistor to the IREF pin,
such that the Cradle charge current will be increased by
70mA (R IREF is 59k and the charge current is 70mA if the
shunts on both JP5 and JP7 are 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.
JP7 - Parallels an additional 59k resistor to the IREF pin,
such that the Cradle charge current will be increased by
another 70mA.
TABLE 1. JUMPER SETTINGS
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
POSITION
EN = HIGH
FUNCTION
Charger disabled
JP2 - A shunt installed on JP2 connects the input source
from connector J1 to the circuit if input current measurement
JP1
EN = GND Charger enabled
Shunt not installed Charger enabled
is not needed. The shunt can be replaced by a current meter
if input current measurement is needed.
JP3 - Selects the power source for logic pull-up and the
LEDs 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 the
upper pin to GND to provide the pull-up and LEDs supply.
JP2
JP3
JP4
JP5
JP6
JP7
Shunt installed
Shunt installed
Shunt installed
Shunt installed
Shunt installed
Shunt installed
Connect input source to VIN
Select BAT as the pull-up source
Set EOC current to 30mA
Add 70mA to charging current
Connects BAT to J2
Add 70mA to charging current
This purpose is to exclude the extra current through the
charger when characterizing small currents such as EOC
and quiescent currents.
3
AN1206.0
October 10, 2005
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