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3. TECHNICAL BRIEF
The backlight of LCD module is controlled by AD6720 via AAT3157 , U404. The control signals related
to Backlight LED are given bellow.
Signals
MLED
LCD_DIM_CTL
MLED[1:2]
Table 3-3. DESCRIPTION OF LCD BACKLIGHT LED CONTROL
C. RF interface
The AD6720 control RF parts through PA_BAND, ANT_SW1, ANT_SW2, ANT_SW3 , CLKON ,
PA_EN, S_EN, S_DATA, S_CLK, RF_PWR_DWN.
Signals
PA_BAND (GPO 17)
ANT_SW1 (GPO 9)
ANT_SW2 (GPO 11)
RF_PWR_DWN(GPO 4) Power down Input
CLKON
PA_EN (GPO 16)
S_EN (GPO 19)
S_DATA (GPO 20)
S_CLK (GPO 21)
Current source for backlight LED
Control LCD backlight level in 16 steps
This pins are returned-paths for backlight LED current source (MLED)
PAM Band Select
Antenna switch Band Select
Antenna switch Band Select
RF LDO Enable/Disable
PAM Enable/Disable
PLL Enable/Disable
Serial Data to PLL
Clock to PLL
Table 3-4. RF CONTROL SIGNALS DESCRIPTION
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Description
Description
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