Wavecom GX64 Application Note - page 5
Gx64 APPLICATION NOTE
Charging Interface
Page: 5/20
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1
General
1.1 Scope
This document is meant to be used in addition to the Integrators Manual of the
intended GR/GS64 Wireless CPU. Basic information such as electrical requirements,
safety concerns, etc. can be found in the Integrators Manual, while this document
focuses more on the different aspects of application implementations.
GR/GS64 Wireless CPUs are designed with the capability to be integrated into an
application which supplies it with power from a Li-Ion battery and provides the
capability to charge this battery through an internal charging algorithm.
Application requirements are:
•
A charger voltage and current limited to ~5.5V and 500mA respectively with a
reverse current protection diode (CPS).
•
A Li-Ion battery pack, with a built-in Thermistor that shares a common
ground with the battery pack.
•
Thermistor bias resistor from VREF to ADIN1.
1.2 Abbreviations
Abbreviation
Description
ADC
Analogue to Digital Conversion
ADIN1
Designated ADC-input for battery thermistor.
Application
Customer hardware and software that contain and control
the GR/GS64 Wireless CPU.
CPS
Charger Power Supply. Refers to the 500mA current limited
supply that should be connected to the CHG_IN-signal of the
GR/GS64.
DRX
GSM Discontinuous Receive mode.
FRC
AT-command Final Result Code
NTC
Negative Temperature Coefficient Thermistor
NVM
Non Volatile Memory
PTC
Positive Temperature Coefficient Thermistor
R
TH nom
Nominal Thermistor resistance value at 25°C.
VREF
Reference voltage used by the interface logic. This signal is
either an output from the Wireless CPU (GS64, GR64001), or
an input to the Wireless CPU (GR64002).