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2.2.3 Single cell mode capacitors
The capacitors connected to CF1P/N and CF2P/N allow step up operation of the
regulator. It is used for powering the device from 1.8V to approximately 3.6V input
voltage and would normally not be needed in 2-cell applications as the input voltage
should then not go that low, but it is included to allow the same PCB layout to be used
for both SB201-1 and SB201-2.
Please see the voltage regulator section in the data sheet for details of regulator
operation. In a regular design one would only include the capacitors for a 1-cell
design.
2.2.4 Cell balancing
The SB201-2 contains cell-balancing FETs, while this circuitry is un-mounted on
SB201-1. Cell balancing is controlled by PB2 and PB3 on SB201-2, and if PB2/PB3
are desired used for other tasks the 0 ? resistors R21/R22 connecting them to the cell
balancing should be removed.
2.3 Edge connector
The edge connector provides a quick and secure connection to the demonstration
board SB200.
3 Connecting batteries to SB201
The SB201-1 is made for 1 series Cell battery pack, while the SB201-2 is made for 2
series cells battery packs. The connections are described in the following
subsections.
WARNING:
Li-Ion batteries must be handled with care as they may pose a safety hazard
if treated incorrectly. It is important that the development of Li-Ion battery
applications are done by people that are skilled and knowledgeable of
correct use and handling of such batteries.
3.1 2-cell application SB201-2
For applications with 2 series cells, connect cells as shown in Figure 3-1: Positive
terminal of upper cell to CELL+, negative terminal of upper cell and positive of lower
cell to PV1R, and finally negative terminal of lower cell to CELL-.
Load or charge the batteries trough PACK+ and PACK-.
To start the part and thus possibly open the FETs, a charge condition must be
initiated by a charger.
4
AVR455
8131A-AVR-10/08
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