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2 Safety precautions when using Li-Ion batteries
The batteries provided with the SB200 have built in protection which might cause
strange effects to occur if the battery is exposed to overstress situations, such as
over-charging. The built in protection does affect the battery characteristics,
especially in terms of resistance, but will ensure that even incorrect use and bugs in a
smart battery application under development does not pose a safety hazard.
Nevertheless, if battery cells heat up, are physically damaged or shows other signs
that can cause or be a consequence of malfunction, the battery cell should be
discarded into a safe deposit.
If other batteries without protection are used, please observe the safety guidelines
following the batteries. Li-Ion and Polymer batteries & packs may explode and cause
fire if misused or defective.
2.1 Warning – HOT!
Be aware that the heat sinks of the Constant Current Load can get very hot . The
shunt resistors (0.5 ? ) at the load and from the charger will also get very hot. Do not
touch them!
The SB200 will limit the temperature to approximately 125°C by turning off the load if
the temperature rises above this point.
Figure 2-1. Constant Current Load – hot heat sink.
HOT
3 Functional overview
The SB200 is developed to ease development of Smart Battery applications: It offers
a communication gateway between the SB20x reference designs which uses half
duplex UART or SMBus to USB. It can charge the batteries connected or inserted in
the board, and act as a load to investigate behavior during discharging of the battery.
The SB200 comes with a PC-software that controls the various features of the kit. An
introduction to this software is found in application note “AVR491 – quick start guide
for SB200”. Both the executable and the source code for the PC software are
available from the Atmel web-site, and can be installed into AVR Studio.
2
AVR459
8132A-AVR-10/08
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