Incor User's GuidePortable Power bq24010/2

Test Procedure
2-3
Test Summary
In place of a battery, a source meter that can sink current can easily be
adjusted to test each mode.
Another way to briefly see each mode on a scope is to connect a 1-mF
capacitor and a 10-kΩ resistor on the output in place of a battery to observe
the power-up and cycling between voltage regulation and fast charge via the
refresh threshold.
The difference between the bq2401x parts, where x is a 0 or 2, is as follows:
The functions on the 0 part are power good output (PG
) for pin 7 and
temperature sense Input (TS) for pin 8. On part 2, pin 8 is charge enable (CE
).
From the factory, the CE
pin has a pulldown resistor and the TS pin is set at
50% of V
CC
, where applicable. These signals, if applicable, are available at the
connectors for external control.
Note:
Because of the battery-detection circuit, it is not possible to switch-in static
load resistors to jump between regulation and constant-current modes. An
alternate procedure described below uses a dynamic load to replace the
battery circuit. That procedure allows testing of each mode.
This is an alternative way of testing the EVM using a dynamic load board in
place of a battery. The circuit is adjusted to work with the displayed parts and
their inherent thresholds. The sequence of the test procedure is important
because of the active battery-detection circuit, refresh feature, and precharge
and fast-charge current levels. (Switching load in or out has different results
in different modes.) No damage should occur, but results might be different
than anticipated if procedure is altered.