Mobile Tablet Charger Module Pre-bringup main work

The main tasks of the pre-bringup phase of a smartphone or tablet charger module are as follows:
1. Boot is normal. MTK platform needs to turn off the first battery detection function, because the MTK platform of the pmic baton pin on the one hand is to detect the temperature of the battery on the other hand or to detect whether the battery is in place, the first boot does not pick up the battery may cause the machine can not be opened.

2. Can I recharge it? Can not charge the main or to check whether the battery temperature is normal, high-pass platform to check the NTC pull resistance affixed to the correct. MTK platform also need to confirm that the battery NTC resistor is 10k, 47k or 100k, different resistors corresponding to the pull-up resistor and the pull-down resistor is not the same. In addition the MTK platform may be the default linear charge even if the code that is incompatible with charger can be recharged.

3.charger module is working properly. Measurement of the signal status of the relevant pins together with the hardware

4. The charging current is normal. After configuring the correct charging current, use a dummy battery to connect the Agilent current source to see if the battery current can reach the set value.

5.dump Charger The Register of the module to see if there is an exception.

6. Battery temperature reading is normal. Battery temperature is an important parameter, read the corresponding node to see if the temperature is accurate.

7. Debug pre-charge, the pre-charge current is normal. Check the charging current of the battery voltage between the 2.1-3.0 charge current and the battery voltage 3.0-3.45v power-on voltage.

8. Check the boot voltage and shutdown voltage. General boot voltage 3.45v, shutdown voltage 3.4V

9.LED Lamp Commissioning. Whether the MTK platform led is the isink foot of the pmic, or the normal Gpio control.