Description Parameter Min Max Unit Notes
Threshold for
charging,
rising (N2300)
V
MSTR+
2.1 V Typical value
Threshold for
charging,
falling (N2300)
V
MSTR-
1.9 V Typical value
Battery interface electrical characteristics
Table 18 Battery IF electrical characteristics
Description Parameter Max Unit
Operation voltage V
IN
4.23 VDC
Current rating I
IN
0.9 A
Internal interfaces
Name of Connection Connector reference
Joystick connector X4500
Display X4400
ALS V4400
Vibra M2100
Microphone B2100
Earpiece B2101
IHF speaker B2102
l2C
I2C is an Inter IC bus and aimed for slow control of peripherals.
The device uses I2C to interconnect QWERTY keyboard controller to RAP.
Keyboard interface electrical characteristics
Description Parameter Min Typ Max Unit Notes
High-level
input voltage
V
IH
0.65* V
DDS
V
DDS
0.3+ V
DDS
V Row
Low-level
input voltage
V
IL
-0.3 0 0.35* V
DDS
V Row
High-level
output
voltage
V
OH
1.62 V
DDS
1.98 V Column
Low-level
output
voltage
V
OL
0 0.45 V Column
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