Texas Instruments bq24010/2 manual

Test Procedure

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 VCC, 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.

Test Summary 2-3