UPD16431A NEC, UPD16431A Datasheet - Page 2

• Manufacturer Part Number: UPD16431A
• Description: 1/2/ 1/3/ 1/4-DUTY LCD CONTROLLER/DRIVER
• Manufacturer: NEC

BLOCK DIAGRAM
2
KEY REQ
DATA
STB
CLK
I/O
control
Write address
Key counter
8-bit
shift
register 8
Command
decoder
56-bit shift register
Output latch (56
Level shifter (56)
Segment driver
Selector circuit
48
56
56
56
56
Key counter
4)
8
OE
Read
address
2
8
Key latch S/R
LED
driver
V
DD
V
Timing
generator
SS
V
Common
driver
LCD
Level
shifter
OSC
V
LC1
4
4
V
LC2
V
LC3
OSC
OSC
key
key
1
4
IN
OUT
OE
LCD/LED
SYNC
PD16431A