LQ043T1DG02 Datasheet, PDF (11/25 Pages) Sharp Electrionic Components – AVC Liquid Crystal Displays Group

LCY-W-06901 Page 8 of 21
【Note 5】
An example of rush current measurement
◎Measurement conditions
・Power supply voltage VCC ： 3.3V AVDD ： 5.0V
VCC
LCD Module Side
Icc
Measurement part
0.1uF
・Disp signal
・Other input signals
： OFF ⇒ ON
： GND
AVDD
I_AVDD
・Measurement system ： refer to right Fig.
4.7uF
・rush current measurement timing ： refer to following Fig.
2.2uF
VCC
AVDD
2.3V
Measurement 1
0.3V
Measurement 2
4.8V
Rising Time
0.01ms
0.3V
Measurement 3
Rising Time
Vsync
0.5ms
①
②
DISP
◎Measurement Example
Measurement 1
Y：20mA/Div., 2V/Div., X：0.003ms/Div.
VCC
Rising Time
Icc
0.01ms
Peak Current
about 100mA
I_CC
Measurement 2
Measurement 3
Y：20mA/Div., 2V/Div., X：0.08ms/Div. Y：50mA/Div., 5V/Div., X：4ms/Div.
IAVDD
AVDD
I_AVDD
Rising Time
0.5ms
Peak Current
about 80mA
Vsync
Disp
①
②
I_AVDD
Peak Current
about 100mA
These rush current won’t flow stationary,
these will flow at the timing shown in Measurement 3.