DATA SHEET
MOS INTEGRATED CIRCUIT
µ
PD16667
160-OUTPUT LCD ROW DRIVER
The
µ
PD16667 is a row (common) driver which contains a RAM capable of full-dot LCD display. With 160 outputs,
this driver can be combined with a column (segment) driver,
µ
PD16662, which contains a RAM to display 240
×
160
pixels to 480
×
320 pixels.
With a built-in display RAM, the column driver can reduce the current consumption, thus making it most suitable
for the display block of a PDA or portable terminal.
FEATURES
•
•
•
•
•
LCD-driven voltage: 20 to 36 V
Duty: 1/160
Driving type: 2 lines selected simultaneously
Output count: 160 outputs
Capable of gray scale display: 4 gray scales
ORDERING INFORMATION
Part No.
Package
TCP (TAB)
Standard TCP (OLB: 0.2 mm pitch, folding)
µ
PD16667N-XXX
µ
PD16667N-051
The external shape of the TCP is custom-made, so please contact an NEC sales representative with your shape
requirements.
Document No. S12838EJ4V0DS00 (4th edition)
Date Published January 1999 N CP(K)
Printed in Japan
The mark
shows major revised points.
µ
PD16667
BLOCK DIAGRAM
X
1
to X
160
V
DD
Liquid-crystal drive circuit
V
1
V
EE
Selection control circuit
Q
1
to Q
80
Bidirectional shift register
DIR
V
CC1
V
SS
Level shifter
L1
L2
/DOFF’
STB
/FRM
Remark
/xxx indicates active low signal.
½
Column driver interface
BLOCK FUNCTION
1. Liquid-crystal drive circuit
This circuit selects and outputs the level for liquid-crystal driving.
One of V
DD
, V
EE
, and V
1
is selected by the output of the selection control circuit.
2. Selection control circuit
This circuit creates the signal which will select the level of the output signal, based on the output of the shift
register circuit and the driving level power selection signals L1 and L2
3. Bidirectional shift register circuit
This refers to the 80-bit bidirectional shift register circuit. The DIR signal can be used to switch over the shift
direction.
The data that has been entered from the /FRM pin is shifted by the low drive signal strobe (STB).
4. Level shifter circuit
This circuit transforms the 5-V signals to the high-voltage signals for liquid-crystal driving.
2
µ
PD16667
PIN FUNCTIONS
Classification
Power suuply
Pin Name
V
CC1
V
SS
V
DD
V
EE
V
1
STB
/FRM
/DOFF’
L1
L2
DIR
X
1
to X
160
I
I
I
I
I
I
O
Input/Output
Pad No.
Function
5 V power for level shifter
GND for level shifter
Power for logic, liquid-crystal drive level power
Power for logic, liquid-crystal drive level power (GND)
Liquid-crystal drive level power
Row drive signal strobe
Frame signal
Display OFF signal
Drive level power selection symbol (1st line)
Drive level power selection symbol (2nd line)
Shift direction selection symbol:when L (DIR = V
EE
), X
1
→
X
160
when H (DIR = V
DD
), X
160
→
X
1
Liquid-crystal drive output
Selects and outputs one of V
DD
, V
EE
, and V
1
.
Liquid-crystal
display timing
Liquid-crystal
drive output
DETAILS OF PIN FUNCTIONS
•
STB (input)
Input pin of the row drive strobe signal
The bidirectional shift register is shifted at STB’s rising edge.
/FRM (input)
Input pin of the frame signal
The shift register data is read at STB’s rising edge.
DIR (input)
Input pin of the drive output’s shift direction selection signal
When the shift direction selection signal (DIR) is “L”, the shift data (selection signal) is shifted from the drive
output X
1
to the X
160
direction. When “H”, it is shifted from the X
160
to the X
1
direction.
/DOFF
’
(input)
Input pin of the display OFF signal
It is placed in the display OFF status (all outputs at V
1
) at the “L” level. In the mean time, it reads the frame signal
and returns to the normal display status at the “H” level.
L1 and L2 (input)
Input pins of the drive level power selection signal
In the case of the liquid-crystal drive output, the two lines are selected simultaneously by the shift register. L1
selects the first line, and L2 selects the second line. Both lines select V
DD
at “H”, and V
EE
at “L”.
•
•
•
•
3
µ
PD16667
SYSTEM CONFIGURATION EXAMPLE
This example shows configuration of a liquid-crystal panel of half-VGA size (480 x 320 oblong) using four column
drivers and two row drivers.
•
•
•
•
•
•
Each column driver sets the LSI No. with PL0 and PL1 pins.
The DIR pins of each column driver are all set to low level.
Only one of the column drivers is set to the master, all the others are set to the slave. Signals are supplied from
the master column driver to the slave column driver and the row driver.
Connect an oscillator resistor to the OSC1 and OSC2 pins of the master, and leave the slave open.
Inputs signals from the system (D0 to D15, A0 to A16, /CS, /OE, /WE, /UBE, RDY, /RESET, /DOFF’) in parallel to
all of the column driver. Connect a pull-up resistor to the RDY signal.
The TEST pin is used to test the LSI, and is open or GND when the system is configured.
V
CC2
PULSE
STB
/FRM
/DOUT, /DOFF’
L1
L2
/REFRH
Y1
Row driver
RDY
/DOFF
/RESET
D0 to D15
A0 to A16
Control
(/CS, /OE,
/WE, /UBE)
OSC1
Master
No. 0
OSC2
Slave
No. 2
Y240
Y240 Y1
Scan direction
Scan direction
160
Row driver
160
Y240
Slave
No. 1
Y1 Y240
Slave
No. 3
Y1
Remark
The /DOUT pin is an output pin for the column driver.
4
µ
PD16667
POWER SUPPLY SEQUENCE OF CHIP SET
It is recommended to apply power in the following sequence.
V
CC2
→
V
CC1
→
input
→
V
DD
, V
EE
→
V
1
, V
2
Be sure to apply LCD drive voltages V
1
and V
2
last.
ON
V
CC2
Note 1
OFF
ON
V
CC1
OFF
4.5 V
CPU I/F
Note 1
0 s or
more
0V
3.3 V
(A0 to A16, /CS,
/OE, /WE, /UBE,
D0 to D15, /DOFF)
3.3 V
/RESET
Note 1
0V
0.3 V
CC2
100 ns or
more
0 s or
more
ON
V
DD
Note 2
OFF
OFF
V
EE
Note 2
ON
0 ns
or
more
ON
V
1
OFF
ON
V
2
Note 1
OFF
Notes 1.
V
CC2
, CPU I/F, /RESET, and V
2
are column driver power supply pins or input pins.
2.
V
DD
and V
EE
do not need to be turned ON at the same time.
Caution Turn off the power to the chip set in the reverse order of the power application sequence.
5
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