CAUTION: Manual control of
the two power inputs is possible when removing the jumper from J16, but precautions
must be taken to
not switch to the secondary power input while the input
capacitor of the boost converter is charged to a voltage above 5 V. This will cause
a voltage spike at the battery terminals which can potentially damage the fuel gauge
IC.
The switchover also occurs
when the ideal diode is disabled by asserting the control input low.
The input voltage of the boost
converter can be measured at TP10.
When powering down the board,
remove the 12-V input first.
Power up the board:
- Ensure J16 is shorted.
- Connect the PMP30963 board to the
EV2400 via J2. Ensure 3.3 V are applied to pin 4 of J2.
- Connect any of the voltage
outputs from the EV2400 to J5, pin 6. This pin is used to control the learning
load and the EV2400 utilizes the voltage outputs as a control signal.
- Connect a Li battery to J1/J3.
The battery and its connection must be low impedance.
- Connect a 12-V supply to J10/J14.
Ensure that this source is low impedance.
- Provide the necessary control
signals to the following pins of J5: pin 2 (charger enable), pin 12 (booster
enable), pin 18 (ideal diode enable).
When all voltages are applied, the
ideal diode enable must be pulled high to deliver power to the boost converter.
Now the boost converter and the
battery charger can be enabled or disabled using the corresponding control inputs.
Switchover between the primary and the secondary power input happens automatically
when the voltage at the primary power input drops below approximately 3 V. When the
voltage rises above approximately 4.6 V, the boost converter is connected to the
primary power input again.