User's Manual

Table Of Contents

GC864 Hardware User Guide

1vv0300733 Rev.12 – 2009-06-04

As you can see, the charging process is not a trivial task to be done; moreover all

these operations must start only if battery temperature is inside a charging range,

usually 5°C – 45°C.

The GC864-QUAD/PY measures the temperature of its internal component, in order

to satisfy this last requirement, it is not exactly the same as the battery temperature

but in common application the two temperature must not differ too much and the

charging temperature range must be guaranteed.

NOTE:

For all the threshold voltages, inside the GC864-QUAD/PY all thresholds are fixed in

order to maximize Li-Ion battery performances and do not need to be changed.

NOTE:

In this application the battery charger input current must be limited to less than

400mA. This can be done by using a current limited wall adapter as the power

source.

NOTE:

When starting the charger from Module powered off the startup will be in CFUN4; to

activate the normal mode, a command AT+CFUN=1 has to be provided.

There is also the possibility to activate the normal mode using the ON_OFF* signal.

In this case, when HW powering off the module with the same line (ON_OFF*) and

having the charger still connected, the module will go back to CFUN4.

NOTE:

It is important having a 100uF Capacitor to VBAT in order to avoid instability of the

charger circuit if the battery is accidentally disconnected during the charging activity.

6.2.2. Thermal Design Guidelines

The thermal design for the power supply heat sink must be done with the following

specifications:

• Average current consumption during transmission @PWR level max:

500mA

• Average current consumption during transmission @ PWR level min:

100mA

• Average current during Power Saving (CFUN=5): 4mA

• Average current during idle (Power Saving disabled): 23mA