ST7781
17.3. Power Supply Configuration
When supplying and cutting off power, follow the sequence below. The setting time for oscillators, circuits and operational
amplifiers depends on external resistance and capacitance.
Power Supply on Sequence
VDD VDDI
Normal Display
VSS
VDD
VDDI
or
VDDI,VDD Simultaneously
DTE=0
D[1:0]=00
GON=1
Display Off
BASEE=0
Reset Signal Initial IC
STB=1
Into Standby Mode
Display Control Setting
SAP=0
AP[2:0]=000
PON=0
LCD Power Supply Halt
Setting
Power Control
Registers Initial
Set Display Windows
Frame Rate Setting
Power Supply Off Sequence
VDDI VDD
Power Supply Startup
1 Setting
VSS
VDDI
VDD
or
VDDI,VDD Simultaneously
Power Supply Startup
2 Setting
Display On
Normal Display
Gamma Cluster
Setting
Fig.17.3 Power Supply ON/OFF Sequence
Ver. 1.7
83
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