UPD16431A NEC, UPD16431A Datasheet - Page 31

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

To microcomputer
Switching Characteristic Waveform
Application Circuit Example (with LED, 1/4 duty, 1/3 bias)
DATA
SCK
V
DD
R
6
R
7
V
DD
R
5
DATA
SCK
STB
KEY REQ
OE
LCD/LED
SYNC.
OSC
OSC
+5 V GND
V
DD
V
IN
OUT
IL
V
SS
+6 V
V
t
LCD
PZL
V
OL2
R
1
PD16431A
V
LC1
R
2
4
V
LC2
R
2
V
LC3
SEG
SEG
R
1
SEG
to
SEG
1
8
LED
GND
KEY
V
/KS
/KS
to
EE
48
1
8
9
n
n
t
PLZ
8
R
R
R
R
R
R
the internal drive voltage is selected
(V
1
2
5
7
8
1
LC1
, R
through R
6
through V
LCD
8
: 1 k to 10 k
: 1/2 R
: 1 k to 10 k
: 100 k TYP.
: 330 to 1 k
V
R
LED
LCD
8
2
are not necessary when
LC3
4
1
40
are open).
8
PD16431A
Key matrix
8
4
31