Charging; How To Use Vref; Vref As Output In Gs64 And Gr64001 - Wavecom Gx64 Application Note

The numbers given above are approximations. The real current levels might differ,
but should most often be less than what is listed.
3.4

Charging

A CPS should be connected to CHG_IN only if a single Li-Ion battery is used as main
power supply. In any other configuration CHG_IN must be left open (not connected).
For more information about charging see the "
Charging Interface
3.5

How to use VREF

VREF operates in two different ways depending on what Wireless CPU is used. In GS64
and GR64001VREF is an output signal and in GR64002 it is an input signal.
3.5.1

VREF as output in GS64 and GR64001

VREF is providing the application with its logic level supply. The application can use
this signal in two ways:
1. Reference voltage for application interface logic (required)
2. Wireless CPU Power On Indication (optional)
As indicated, the application logic interface must be referenced to VREF.
application cannot supply an active high level in to the Wireless CPU on any signal
unless VREF is active high. The logic interface must also be the same level as VREF.
For GS64 this level is 1.8V, and for GR64001 it is 2.8V.
Gx64 APPLICATION NOTE
Power Management
Page: 17/30
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GR/GS64 Series Application Note -
The