User's Manual

A8000 User Guide
Confidential
A8000_User_Guide_V1.0 Page 12 of 22 2009/05/13
2.7 Backlight
2.7.1 Backlight Control Description
With default setting, BACKLIGHT pin of A8000 is used to drive either keypad led or display
backlight led. Table2-10 gives the BACKLIGHT pin description.
Table2-10: Backlight pin description of A8000
Signal Name Pin No. I/O Description
BACKLIGHT
16
O Keyboard or lcd backlight led
control
2.8 Keypad Interface
2.8.1 Keypad Interface Description
A8000 provides a 5X5(that is 5 output and 5 input) keypad array for user, and if needed, the array
could be configured as 6X4(that is 6 output and 4 input), the keypad pins are defined as follows. It
must be noted that when used as power key, SWITCH_ON signal should be connected to
VDD_LRTC to turn on A8000, the keypad pins function are descript in table2-11 as following.
Table2-11 keypad pins description of A8000
Signal Name Pin No. I/O Description
SWITCH_ON 44 I ON/OFF Key
KEYPADCOL0 6 O Keypad array output
KEYPADCOL1 7 O Keypad array output