UPD16432B NEC, UPD16432B Datasheet - Page 4

• Manufacturer Part Number: UPD16432B
• Description: 1/8/ 1/15 DUTY LCD CONTROLLER/DRIVER
• Manufacturer: NEC

PIN DESCRIPTIONS
4
SEG
SEG
SEG
SEG
SEG
COM
LED
SCK
DATA
STB
KEY REQ
RESET
LCD OFF
SYNC
OSC
OSC
KEY
V
V
V
V
DD
SS
LCD
LC1
Pin Symbol
1
1
1
8
9
61
85
to V
IN
OUT
0
/KS
/KS
to LED
to KEY
to SEG
/COM
/COM
to COM
LC5
1
8
to
14
10
4
4
60
to
9
Segment output/key source
output dual-function pins
Segment outputs
Segment output/common
output dual-function pins
Common outputs
LED output pins
Shift clock input
Data input/output
Strobe input
Key request output
Reset input
LCD off input
Synchro
Oscillation pins
Key data inputs
Logic power supply pin
GND pin
LCD drive voltage pin
LCD drive power supply
Pin Name
91 to 100
26 to 33
34 to 85
86 to 90
22 to 25
Pin No.
10 to 6
1 to 4
17
18
19
16
15
14
13
20
21
12
11
5
Pins with dual function as dot matrix LCD segment outputs and
key scanning key source outputs
Dot matrix LCD segment outputs
Switchable to either dot matrix LCD segment outputs or com-
mon outputs
Dot matrix LCD common outputs
LED outputs are Nch open-drain.
Data shift clock
Data is read on rising edge, and output on falling edge.
Performs input of commands, key data, etc., and key data
output. Input is performed from the MSB on the rise of the shift
clock, and the first 8 bits are recognized as a command. Output
is performed from the MSB on the fall of the shift clock.
Output is Nch open-drain.
Data input is enabled when “H”. Command processing is
performed on a fall.
“H” if there is key data, “L” if there is none. Key data can be read
irrespective of the state of this pin. Output is CMOS output.
Initial state is set when “L”.
When “L”, a forced LCD off operation is performed, and SEG
& COM
Synchronization signal input/output pin. When 2 or more chips
are used, wired-OR connection is made to each chip. A pull-up
resistor is also required when one chip is used.
Connect oscillator resistor.
Key scanning key data inputs.
Internal logic power supply pin
GND pin
LCD drive power supply pin
Dot matrix LCD drive power supply
n
output the unselected waveform.
Function
PD16432B
n