Specifications

Wireless CPU
®
Q24 Series
Interfaces
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WM_PGM_Q24NG_PTS_001-005 November 20, 2007
y charging
rocedure remains possible by hardware control as long as the charger is plugged:
rough a trickle current
pre-charging current (min=40mA, typ=50mA,
The purpose of the trickle and
the
, by preventing the battery from being discharged
Pin description
When the operating system is not activated (VBATT< 3V2), the batter
p
• VBATT<2V8: the battery is charged th
• 2V8<VBATT<3V2:
max=60mA)
pre-charging current is to:
• Allow the battery charging, even if VBATT is too low to power-ON
Wireless CPU
®
.
• Avoid battery damage
below the minimum battery level.
Signal Pin number I/O I/O type Description
CHG_IN I og Curren e
input
1, 2, 4 Anal t sourc
BAT_TEMP 8 I og A/D c 3 Anal onverter
Electrical characteristics
Parameter Min Typ Max Unit
Resolution 10 bits
Sam Ksps/s pling rate 17
Input Impedance
1M
(R)
kΩ
Input Impedance
100 nF
(C)
BAT_TEMP
2
Input signal
range
0 V8 V
CHG_IN
<BattLevelMax
- 6 V
+0.5*
CHG_IN Current 400 800 mA
* The min CHG_IN voltage depends istics. (
e Monitoring
Temperature monitoring is available on w
BAT-TEMP ADC input must be used le the tempe gnal
provided by an NTC te ns m and m m temperature
range may be set by an AT command (see the section 3.14.4 Li-Ion charging
alg
on the battery character see the following chapter).
3.14.2 Temperatur
ly for the Li-Ion battery
to samp
ith algorithm 1. The
rature analog si
mperature se or. The minimu aximu
orithm).