Specifications

Product Technical Specification & Customer Design Guidelines
Interfaces
A dedicated ADC input, ADIN1/ BAT-TEMP pin 26, for temperature monitoring (only
for Li-Ion battery technologies).
To use the charging functionality, three items of hardware are required:
¾ A charger power supply
This provides a DC power supply limited to 800mA and with a voltage
range according to the battery chosen and the Q64 specification.
¾ A battery
The charging functionality must be used with rechargeable batteries only.
Three battery types are supported: Li-Ion, Ni-Mh and Ni-Cd.
If the Q64 Wireless CPU is not powered (VCC pin 1, 3, 5, 7, 9) by a
rechargeable battery, the CHG_IN input (pin 11) must be left open.
¾ An analog temperature sensor
The analog temperature sensor is only used with Li-Ion batteries for battery
temperature monitoring. This sensor is composed of an NTC sensor and
several resistors.
3.13.2 Ni-Cd / Ni-Mh Charging Algorithm
To charge the battery, the algorithm measures battery level when the switch is open
(T2) and charges the battery by closing the switch (T3). When the battery is charged
(battery voltage has reached BattLevelMax) the switch is open for time T3.
BattLevelMax
T1T2 T3
Battery Level
Switch State
opened
closed
Figure 27: Ni-Cd / Ni-Mh charging waveform
Electrical characteristics of Ni-Cd / Ni-Mh battery timing charge
Parameter Min Typ Max Unit
T1 1 s
T2 0.1 s
T3 5 s
Note: T1,T2,T3 and BattLevelMax may be configured by AT command.
The battery level is monitored by the software (but not temperature).
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WA_DEV_Q64_PTS_001-003 January 9, 2009