User's Guide

UC864-E-AUTO / AWS-AUTO Hardware User Guide

1vv0300795 Rev.11 – 2010/11/18

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 HSDPA transmission @PWR level

max in UC864-E-AUTO / AWS-AUTO : 730mA

• Average current consumption during class12 GPRS transmission @PWR

level max: 650mA

NOTE:

NOTE: NOTE:

NOTE:

For all the threshold voltages, inside UC864-E-AUTO / AWS-AUTO, all thresholds are

fixed in order to maximize Li-Ion battery performances and do not need to be

changed.

NOTE:

NOTE: NOTE:

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:

NOTE: NOTE:

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:

NOTE:NOTE:

NOTE:

It is important to have a 100ųF Capacitor to VBAT in order to avoid instability of the

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