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therefore be used to test and characterize battery cells and application. The load can
be calibrated to get better accuracy and linearity by rewriting the firmware for SB200.
8.1 Short circuit load condition
The load is implemented as an integrating circuit. This means that it can be used to
simulate high out-rush currents: if the load is enabled, but no current source is
available, it will saturate and open fully (max load). When a voltage/current source is
enabled the load will for a short moment draw maximum current, and can be seen as
a short circuit load. As soon as the current starts flowing the load will start to adjust
the current to reach the target level.
This can cause problems if one is not aware of this, since the smart battery AVR
MCU will be detect this as a high current/over current/short circuit situation. However,
this characteristic of the load can be used to test an implementation of a smart
battery, as it can be used intentionally to trigger a high out-rush current situation and
validate correct behavior.
9 Test and connection points
The SB200 offer a variety of test and connection points, some for easy access to
relevant signals with scope probes, and others to make it possible to connect external
units.
9.1 External connection
On each side of the heat sink at the Constant Current Load, connection points are
available. These can be used to measure the battery stack voltage, or an external
charger can be connected here. The connection points are designed to match a 4mm
power connector such as Farnell no: 1101128 / 1101127. This makes it also easy to
connect an external load if the on-board load is not sufficient. It also allows for the on-
board load to be used towards an external target, for testing purposes.
9.2 External battery cells
If it is desired to connect battery cells to the SB200 that does not fit in the sockets,
these can be placed on an external board and connected to the SB200
test/connection points at each of the battery cell sockets (see Figure 3-1).
These connections points can also be used to connect an external power supply
instead of batteries. This can be used to more easily and safely test how the smart
battery implementation reacts to extreme voltage/current conditions.
If working with cells that fit in the sockets these test/connection points can be used to
measure the voltage over the battery cells.
9.3 Signal line test points
All signals available on the SB20x edge connector are available as test points. These
are located next to the SB20x daughter board connector (see Figure 3-1). 2.54mm
pin headers can be mounted to make it easier to hook a scope probe to these test
points.
6
AVR459
8132A-AVR-10/08
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