Software Implementation - Wavecom GX64 Application Note

2.2.2

Software Implementation

A charging algorithm for Li-Ion batteries is implemented in the GR/GS64 software.
When a CPS is detected, the charging algorithm becomes enabled.
temperature is then measured continuously on ADIN1 with a sampling duty cycle rate
of approximately 450ms.
If the CPS is removed, the CPS-availability polling is aligned with the paging channel
(DRX-mode) to minimise current consumption. This will affect the time it takes to
detect a CPS, since in worst case it will only be sampled once every 2.1s (2118 ms).
2.2.2.1 How to calibrate the Thermistor ADC-values
The application will have to set the ADC-values for 0°C, +4°C, +36°C and +40°C. To
permanently program these four levels into the Wireless CPU the following sequence
should be performed for each temperature:
•
•
•
When the ADC-value for all four temperatures have been recorded they need to be
stored in NVM by sending "AT*EBATTCNF=1,<0°C value>,<+4°C value>,<+36°C
value>,<+40°C value>".
AT*EBATTCNF is issued, but a Wireless CPU restart is required to begin utilising the
newly stored parameters.
DANGER
Gx64 APPLICATION NOTE
Charging Interface
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Place the whole application (or only the battery with the included Thermistor)
into a temperature chamber. Power on the application and the Wireless CPU.
Set the temperature of the chamber to the desired level.
temperature has been reached, let the device soak until the temperature of the
whole device is stable.
Read the ADC-value of ADIN1 by sending AT*E2IO=0,"AD1".
received value when it is stable.
The values are permanently stored to NVM when
If the application has implemented its own temperature protection
circuitry the built-in thermistor table can be disabled by setting the
values to extreme levels (AT*EBATTCNF=1,0,0,1023,1023). It should
be noted that any battery safety circuitry indicated by battery vendor
must be implemented.
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The battery
After the set
Record the