UPD16488AP NEC [NEC], UPD16488AP Datasheet - Page 73

• Manufacturer Part Number: UPD16488AP
• Description: 1/92 DUTY LCD CONTROLLER/DRIVER WITH FOUR-LEVEL GRAY SCALE, ON-CHIP RAM
• Manufacturer: NEC [NEC]

8.2 Power OFF Sequence (When Using On-Chip Power Supply)
8.3 Power ON Sequence (When Using External Driver Power Supply, Power ON → → → → Display ON)
Note
Stabilization of external LCD driver power supply
Initialization via command input (user-specified)
This 1200 ms wait time varies according to the panel characteristics and the capacitance value of the
boost/smoothing capacitor. NEC recommends determining the wait time after making a thorough evaluation of the
actual device (refer to 8.5 V
External LCD driver power supply ON
Set partial electronic volume register
Logic power ON when /RES pin = L
Set electronic volume register
Selection of IC functions, etc.
Power supply stabilization
HPM1 = 1, HPM0 = 0
Power supply OFF
DISP = 0, HALT = 0
DISP = 0, HALT = 1
DISP = 0, HALT = 0
DISP = 1, HALT = 0
Operation mode
Command reset
/RES pin = H
↓
↓
↓
↓
↓
↓
↓
↓
↓
↓
↓
↓
↓
↓
OUT
, V
LCD
Voltage Sequence (power ON → → → → power OFF)).
Data Sheet S15745EJ2V0DS
R0
R32
R35
R36
R2
R0
R0
R0
Display OFF, internal operation start mode
Sets high power mode
[EV7, EV6, EV5, EV4, EV3, EV2, EV1, EV0]
= [0, 0, 0, 0, 0, 0, 0, 0]
[PEV7, PEV6, PEV5, PEV4, PEV3, PEV2, PEV1, PEV0]
= [0, 0, 0, 0, 0, 0, 0, 0]
Wait at least 1200 ms before power OFF
V
Wait at least 50 µ s befor command input
Register reset
Display OFF, internal operations stopped
Power system control register 1 (R32) :
[OP2, OP1, OP0] = [0 ,0 ,X]
Display OFF, internal operations started
V
Display ON, internal operations started
DD1
OUT
, V
power supply ON
DD2
power ON, V
OUT
= Hi-Z
Note
.
µ µ µ µ PD16488A
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