Function Description
Function Description –
– Current sink for backlight
Current sink for backlight
▪
Current sink for LCM backlight LED:
– Max. 4 current sink
No external component required
– No external component required
– Current balance between channels
– Individual channel current/enable control
▪
Note 1 : Luminance become lower when low battery.
– Please follow “Criteria: Vth = Vf + 0.25V” to avoid this issue
E
– Ex.
•
Set VBAT low voltage shutdown at 3.5V
•
Select
LED (Vf < 3.5 – 0.25 = 3.25V)
will keep luminance equal under
l
ti
normal operation range.
▪
Note 2 : PWM should set higher to prevent
LCM from flickering in
l
VBAT PWM f
20kH i
d d
t
low VBAT
.
PWM frequency > 20kHz is recommended
to
prevent both LCM flickering and audible noise.
Copyright © MediaTek Inc. All rights reserved.
25
Summary of Contents for MT6252
Page 2: ...Baseband design notice Baseband design notice Copyright MediaTek Inc All rights reserved ...
Page 13: ...Memory design notice Memory design notice Copyright MediaTek Inc All rights reserved ...
Page 39: ...Design Notice Pulse Charging Pulse Charging Copyright MediaTek Inc All rights reserved ...
Page 59: ...Design Notice Audio Copyright MediaTek Inc All rights reserved ...
Page 107: ...MT6252 LCM Design Notice Copyright MediaTek Inc All rights reserved ...
Page 116: ...MT6252 RF Design Note MT6252 RF Design Note Copyright MediaTek Inc All rights reserved ...
Page 118: ...Reference Design Reference Design Copyright MediaTek Inc All rights reserved ...
Page 120: ...META Tools META Tools Copyright MediaTek Inc All rights reserved ...
Page 124: ...Key RF Components Key RF Components Copyright MediaTek Inc All rights reserved ...
Page 130: ...MT6252 Reference Phone MT6252 Reference Phone Copyright MediaTek Inc All rights reserved ...
Page 132: ...TRx TRx TRx TRx 2008 06 Copyright MediaTek Inc All rights reserved 131 ...
Page 134: ...RX matching RX matching 2008 06 Copyright MediaTek Inc All rights reserved 133 ...
Page 136: ...Layout Rule Layout Rule 2008 06 Copyright MediaTek Inc All rights reserved 135 ...
Page 140: ...7 Keep RF trace as 50Ω 2008 06 Copyright MediaTek Inc All rights reserved 139 ...