Wavecom GX64 Application Note - page 9
Gx64 APPLICATION NOTE
Charging Interface
Page: 9/20
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2.2.1.2 Battery Thermistor
The battery thermistor can be of either PTC or NTC type. The resistor value of both
the thermistor and the bias resistor shall be selected so that the most optimal ADC-
range is available. The slope of the Thermistor curve is not important.
Wireless
CPU type
VREF level
Description
GS64 1.8V
R
BIAS
, R
TH nom
values should be the same.
GR64001 2.8V
R
BIAS
, R
TH nom
values should be the same.
GR64002 1.8V
to
2.8V R
BIAS
, R
TH nom
values should be the same.
GR64002 >2.8V
to
5.0V
The value of R
BIAS
should be selected so that the
voltage level on ADIN1 does not exceed 2.5V at
any extreme temperature.
There are four temperatures that must be calibrated (low, resume_low, resume_high,
high).
Temp mode
Temp
(°C)
Description
low 0
Low temperature limit. Charging will be suspended if
temperature goes below this limit.
resume_low +4
Charging resume level. After the low limit has been
reached, charging will not resume until temperature
exceeds this level.
resume_high +36
Charging resume level. After the high limit has been
reached, charging will not resume until temperature
is below this level.
high +40
High temperature limit. Charging will be suspended
if temperature goes above this limit.