M
ODEL
SL599 V
ERSION
V_1.0
P
REPARED BY
H/W
D
ATE
2007.04.11
S
UBJECT
T
ECHNICAL
M
ANUAL
P
AGE
41/52
SL599
T
ECHNICAL
M
ANUAL
10.
Vibrator , Alerter, LED switches
Three built-in open-drain output switches drive the vibrator motor(Pin38), alerter beeper(Pin39) and
LED(Pin41) in the handset. Each switch is controlled by baseband chipset with enable pins. The
switch of LED can sink 150mA to drive up to 10 LED simultaneously for backlight. The switch of
vibrator can sink 250mA for a vibrator motor. The switch of alerter can sink 300mA to drive the
beeper. And all the open-drain output switches are high impedance when disable. ALERTER pin is
dedicated to Main KEY Back-Light LED, VIBRATOR pin is dedicated to Vibrator Motor.
11.
Battery Charger
BATUSE pin can set MT6305 to fit the battery type. When BATUSE is set low, Li-ion battery is used.
MT6305 charges the battery in three phases : pre-charging, constant current mode charging, and
constant voltage mode charging. The circuitry of MT6305 combines with a PMOS transistor, diode,
current-sense resistor externally to form a simple and low cost linear charger. MT6305 is available
pulsed top-off charging algorithm by the CHRCNTL pin control from baseband chipset.
Figure 27. Charger and Voltage Detection
Figure 28. Li-Ion Battery Charging Profile.