Operation - Wavecom GX64 Application Note

The GR/GS64's internal current limit is set to 1.3A.
current limiter has to be implemented. This current limiter must be set to 100mA,
but can have the option of a 500mA setting. The default must always be 100mA, but
it can be switched to 500mA if connected to a high power hub.
The current limiter used in the example above is a Maxim MAX890L. The current is
set by a resistance to ground on pin 5. GPIOx should be default low, causing the
resistance to ground to be 15.0k (~100mA) after a high-power hub is detected GPIOx
can be set high causing the resistance to ground to be 15.0k//4.42k (3.41k) which
corresponds to ~400mA.
2.3

Operation

The GR/GS64 power supply implementation using a battery-charger solution is
dependent on the battery being attached to VCC and GND at all times. The GR/GS64
cannot be powered through CHG_IN without a Li-Ion battery available.
NOTE
If a CPS is applied to a GR/GS64 that is currently powered down, the Wireless CPU will
enter a "charge only"-mode. This mode is from a SW point of view part of "+CFUN: 0"
(power down). In this mode it is not possible to run embedded scripts, send and
receive AT-commands, etc. The only three events that can power up the GR/GS64
are:
•
•
•
Gx64 APPLICATION NOTE
Charging Interface
Page: 12/20
The "charge only"-mode feature mentioned below is a SW upgrade that
might not be available in all SW-versions. Let your Wavecom FAE know
if this feature does not work as expected, since that might mean that a
newer SW is required.
a low pulse on ON/OFF
a high level on PON_H
an ALARM generated by the RTC
This document is the sole and exclusive property of WAVECOM. Not to be distributed or divulged without prior written agreement.
Ce document est la propriété exclusive de WAVECOM. Il ne peut être communiqué ou divulgué à des tiers sans son autorisation préalable
This means that an external