AAT2842 Datasheet, PDF (16/21 Pages) Advanced Analogic Technologies – High-Current Charge Pump with S2Cwire™ Control and Dual LDO for Backlight and Flash

AAT2842
High-Current Charge Pump with S²Cwire™
Control and Dual LDO for Backlight and Flash
Evaluation Board Layout
Figure 2: AAT2842 Evaluation
Board Top Layer.
Evaluation Board User Interface
The user interface for the AAT2842 evaluation
board is provided through four buttons and a num-
ber of connection terminals. The board is operated
by supplying external power and pressing individual
buttons or button combinations. Table 4 indicates
the function of each button or button combination.
To power-on the board, connect a power supply or
battery to the DC- and DC+ terminals. Close the
board supply connection by positioning the J1
jumper to the ON position. A red LED indicates that
power is applied.
Figure 3: AAT2842 Evaluation Board
Bottom Layer.
The evaluation board is flexible so that the user
can disconnect the enable lines from the micro-
controller and apply external enable signals. By
removing the jumpers from J2, J3, and/or J4, exter-
nal enable signals can be applied to the board.
External enable signals must be applied to Pin 1 of
each J2, J3, or J4 terminal.
When applying external enable signals, considera-
tion must be given to the voltage levels. The exter-
nally applied voltages cannot exceed the supply
voltage that is applied to the IN pins of the device
(DC+).
The LDO loads can be connected directly to the
evaluation board. For adequate performance, be
sure to connect the load between OUTA/OUTB and
DC-, as opposed to some other GND in the system.
16
2842.2006.10.1.0