Application Charging Block Diagram; Implementation; Hardware; Figure 2. Application Charging Block Diagram - Wavecom GX64 Application Note

2.1.2

Application Charging Block Diagram

The figure below shows a typical implementation of a battery solution with a
capability to charge using the built-in charger of the GR/GS64 Wireless CPU.
2.2

Implementation

2.2.1

Hardware

The following subsections define the Charging Power Supply and Battery Thermistor,
software implementation, and general hardware usage.
2.2.1.1 Charging Power Supply (CPS)
To charge a single cell Li-Ion battery a voltage and current limited power supply is
required between the CHG_IN-input of the Wireless CPU and ground.
designs for an AC/DC and a DC/DC charger are provided in Appendix A and B at the
end of this document.
The CPS must have a reverse current protection diode on its output and a capacitor of
at least 10uF value must be provided as close to the CHG_IN signal as possible.
A single Li-Ion battery should be applied between all six VCC and GND pins. The
routing length should be kept to a minimum and be designed to handle a minimum of
3A current. This leaves approximately 50% margin.
A bias resistor for the battery built-in thermistor is required. This resistor should be
connected between VREF and ADIN1 (see Battery Thermistor section below).
Gx64 APPLICATION NOTE
Charging Interface
Page: 8/20
Figure 2. Application Charging Block Diagram
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Reference