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3. TECHNICAL BRIEF
G. TA (Travel Adaptor)
Input voltage: AC 85 V ~ 260 V, 50~60 Hz
Output voltage: DC 5.2 V (
Output current: Max 850 mA (
H. Battery
Li-polymer and Li-ion battery (Max 4.2 V, Nom 4.0 V)
Standard battery: Capacity - 630 mAh, Li-polymer
Extended battery (Optional): Capacity - 940 mAh, Li-Ion
3.9 Memories
32M flash memory + 4M SRAM
16 bit parallel data bus
ADD01 ~ ADD21
RF Calibration data art stored in Flash (LG-512W do not use EEPROM)
3.10 Display and Interface
There is the control output LCD_CS which is derived from the AD6522, this acts as the chip select
enable for the LCD module. AD6522 uses DATA[00:07] pins to send data for displaying graphical
text onto the LCD
3.11 Keypad Switches and Scanning
The key switches are metal domes, which make contact between two concentric pads on the
keypad layer of the PCB when pressed. There are 24 switches (S1~S24), connected in a matrix of
5 rows by 5 columns, as shown in Figure, except for the power switch (S1), which is connected
independently. Functions, the row and column lines of the keypad are connected to ports of the
AD6522. The columns are outputs, while the rows are inputs and have pull-up resistors built in.
When a key is pressed, the corresponding row and column are connected together, causing the
row input to go low and generate an interrupt. The columns/rows are then scanned by the AD6522
to identify the pressed key.
0.2 V )
50 mA )
Display format
Back light
Table 3-12. LCD Module.
- 28 -
Description
128 x 128 dots
EL backlight
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