DATA SHEET
µ
PD16435, 16435A
DOT MATRIX LCD CONTROLLER/DRIVER
MOS INTEGRATED CIRCUIT
DESCRIPTION
The
µ
PD16435 and 16435A are controllers/drivers for a 119
×
73-dot LCD, and perform LCD full-dot and character
composite display by means of control by a microprocessor that has a 4 or 8-bit data bus. A charge pump type
DC/DC converter is also incorporated, enabling 3 or 5 V single power supply drive.
The
µ
PD16435 uses an external reference clock. The
µ
PD16435A has the on-chip oscillation circuit (external
crystal resonator).
FEATURES
• Can interface to 4 or 8-bit CPU.
• Incorporates 119 segment outputs and 73 common outputs.
(Display duty selectable from 1/35, 1/37, 1/71, 1/73)
• 5
×
7 character font 208 character data configuration character generation ROM and 16 character data configuration
character generation RAM, allowing composite full-dot and character display
• Incorporates extended display functions such as magnification, lateral scrolling, blink, reverse, etc.
• Operating voltage: 2.7 V to 5.5 V
• On-chip DC/DC converter: Selectable between
×4
set-up circuit and
×2
step-up circuit
• On-chip temperature correction circuit
• Master/slave operation capability
• On-chip power-on reset circuit
• On-chip oscillation circuit (
µ
PD16435A)
• 232-pin TCP (Tape Carried Package)
ORDERING INFORMATION
Part Number
Package
TCP (TAB), Standard ROM code
Standard quad TCP (Conforms to EIAJ), Standard ROM code
Standard dual TCP (Output OLB: 0.25 mm pitch), Standard ROM code
TCP (TAB), Standard ROM code
Standard quad TCP (Conforms to EIAJ), Standard ROM code
Standard dual TCP (Output OLB: 0.25 mm pitch), Standard ROM code
µ
PD16435N-001-×××
µ
PD16435N-001-001
µ
PD16435N-001-002
µ
PD16435AN-001-×××
µ
PD16435AN-001-001
µ
PD16435AN-001-052
Explanation of Part Number
µ
PD16435 (A) N-xxx-xxx
TCP code
ROM code
The TCP model is a custom model. For details, consult NEC sales representative.
Document No. S10298EJ3V0DS00 (3rd edition)
Date Published April 1997 N
Printed in Japan
©
1995
µ
PD16435, 16435A
PIN DESCRIPTIONS
Pin Name
CS
RS
Pin No.
255
254
Input/Output
Input
Input
Output Type
–––
–––
Chip select signal
Register selection signal (specifies address register when “0”,
control register when “1”).
Read enable signal. Reads write address when scrolling.
Active edge is falling edge.
Write enable signal.
Active edge is falling edge.
Word length selection signal (4-bit input when “1”, 8-bit input
when “0”).
Transmit/receive data (3-state bidirectional)
Upper
→
D4 to D7
Lower
→
D0 to D3 (These pins should be set as unused in case
of 4-bit data).
In test mode, these pins are output pins.
In a 4-bit transfer, storage is performed in the upper (MSB) in
order from the data transferred first.
“0” indicates busy state.
“0”
→
Initialization of all internal registers and commands is
performed. Output is fixed at V
1
.
Signal is output to CPU on completion of one-character scroll.
Synchronization signal input/output pins for master/slave
operation.
Description
RD
253
Input (Schmitt)
–––
WR
252
Input (Schmitt)
–––
WS
251
Input
–––
D
0
to D
7
250
to
243
Input/output
CMOS 3-state
BUSY
RESET
SCR
SYNC
240
242
241
239
Output
Input
Output
Input/output
Nch open-drain
–––
CMOS
Nch open-drain
OSC
1
OSC
2
235
234
–––
–––
µ
PD16435: Input the 4.19 MHz reference clock to the OSC
1
pin
externally. Leave the OSC
2
pin open. (Always outputs high
level.)
µ
PD16435A: This is the pin to which the 4.19 MHz crystal
resonator is connected. Input the external clock to OSC
1
first.
2 Hz external clock input pin. Scaled by 2 internally to generate 1
Hz, used as blink synchronization signal.
Common output signals
OSC
3
COM1 to
COM73
SEG1 to
SEG119
TEST1
TEST2
233
212 to 176
3 to 38
41 to 70
81 to 134
137 to 171
238
237
Input (Schmitt)
–––
Output
Analog switch
Output
Analog switch
Segment output signals
“1”
→
Test mode
“0” or open
→
Normal operating mode
Output
–––
4
µ
PD16435, 16435A
Pin Name
V1
Pin No.
221
220
to
217
224
223
232, 256
257, 222
Input/Output
Output
Output Type
–––
LCD drive power supply pin
Internal OP-amp output
Description
V2 to V5
Input
–––
LCD drive power supply pins
Can be adjusted by addition of external resistor.
V
IN
(–)
V
IN
(+)
V
CC
, GND1
V
DD
, GND2
Input
–––
–––
–––
–––
–––
Liquid crystal drive power supply OP-amp input pins
Logic power supply, GND
Liquid crystal drive (step-up) power supply, GND
Drive voltage selection pin
“1”
→
V
DD
= 3 V (×4 step-up circuit selected)
“0”
→
V
DD
= 5 V (×2 step-up circuit selected)
A 1
µ
F tantalum or ceramic capacitor should be connected
externally.
3/5
236
Input
–––
C1±, C2±,
C3±
230 to
225
–––
–––
REFERENCE CLOCK
Product Name
Reference Clock
External input
On-chip oscillation circuit (External crystal resonator)
µ
PD16435
µ
PD16435A
OSC CIRCUIT (
µ
PD16435A)
OSC
1
OSC
2
4.19 MHz
5
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