Power-Set-Input; Battery Pack Characteristics - FALCOM I56 Hardware Description

I65/I56I HARDWARE DESCRIPTION

5.6.1 Power-Set-Input

This input pin has to be used if a rechargeable Li-Ion battery is connected to
the module. The circuit diagram how to connect a Li-Ion battery to the
module is shown in chapter 5.6. If the PWR-SET pin is kept open (low
level), the internal regulator is active which drops internally the input
voltage down to 3.7 V DC and supplies the GSM/GPRS core with 3.7 V DC
(see figure below, the PWR-SET pin is low "L" and the regulator is active).
As above, usage of the PWR-SET pin is mandatory, if a rechargeable
battery is connected to the VC5 pin, BAT_TEMP and to the one of provided
Grounds. In this case the PWR-SET pin has to be set to the high level e.g.
connect it to the VC5 and POWER pins (see figures 11 and below, the
PWR-SET pin is set to high "H"). The input voltage on the POWER pin is
monitored internally from the GSM/GPRS core and provided on the VC5
pin for charging/discharging of connected battery. Set the PWR-SET pin of
High level enables the VC5 pin to alert its state from input to the
input/output which is required for battery applications. In order to make a
proper charging procedure, note that the POWER pin has to be supplied
with 5.5 to 8 V DC, and limited current to 800 mA from external power
source.
Figure 7: power set input

5.6.2 Battery pack characteristics

The charging algorithm has been optimized for a Li-Ion battery pack that meets
the characteristics listed below. It is recommended that the battery pack you
want to integrate into your I56/I56i application is compliant with these
specifications. This ensures reliable operation, proper charging and,
particularly, allows you to monitor the battery capacity using the AT^SBC
command (see [4] for details). Failure to comply with these specifications
might cause AT^SBC to deliver incorrect battery capacity values. A battery
pack especially designed to operate with I56/I56i module is specified in
chapter 5.6.3.
This confidential document is the property of FALCOM GmbH and may not be copied or circulated without permission.
VERSION 1.00
Page 35